How to read data in IRP_MJ_READ and IRP_MJ_WRITE

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  - 1
    - Printer driver problem XP SP1 Hi, My old Epson stylus colour printer was recognised by new XP SP1 when first installed a few months ago. A few weeks ago simply stopped working. No problem with printer; no problem with port. Unable to download driver proposed by Epson nor driver proposed by MS. What other solution? Peter Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52029
  - 2
    - Remote Debugging, User and Kernel Mode I'm setting up host and target machines for debugging both kernel mode code, built with the DDK, and user mode code, built with Visual Studio. NET. I'm planning to use the Visual Studio debugger for the User code. It appears to support remote debugging, but I've never used it this way. My host-target connection here will be via my ethernet LAN. I plan to use Windbg for the driver code. I have a dedicated 1394 connection for Windbg, which seem to work. To you experienced developers, does this setup make sense? Right now I'm concerned about making sure that the executables are always up-to-date on the target, and that the symbols are always current. Any tips for changing or using this setup would be appreciated. I don't suppose I can use one debugger for both kernel and user mode, can I? Thanks, Dennis Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52021
  - 3
    - Keyboard filter to simulate keys Hello, I'm new to driver development, in fact I have never written a real mode sys file nor a driver. Now I have to accomplish the following task: A program generates virtual key events to control a directx game. Because directx directly reads out the keyboard I can't simply use the WinAPI keybd_event or a simple SendKeys function. So the best way seems to be to send the keystrokes from my application (can be delphi, c++ or vb) to the keyboard filter driver that creates the keystroke. Therefore I register a new keyboardchain filter KbdFilterInit Then I'd like to feed keys into the keyboard chain to simulate button press events. Therefore I create KeyData packets. To process the keyboard chain I implement proper dispatch function for reading NTSTATUS KbdDispatchRead( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp ) So my questions are: Is there already something similar out there that I can use? Is it possible to create such a driver file without getting 1000s of blue screens? What's the easiest way to do this. How can I send some bytes from my app to the driver? (My app tells the driver to generate an 'F1' keystroke...) Is my theory correct? I hope to get some help from you. Thanks for any hints Mel NTSTATUS KbdFilterInit( IN PDRIVER_OBJECT DriverObject ) /*++ Routine Description: Create a device object and attaches it to the first keyboard device chain Arguments: DeviceObject - pointer to a device object. Return Value: NT Status code --*/ { UNICODE_STRING ntUnicodeString; NTSTATUS ntStatus; PDEVICE_OBJECT DeviceObject = NULL; // // Only hook onto the first keyboard's chain. // RtlInitUnicodeString( &ntUnicodeString, L"\\Device\\KeyboardClass0" ); // // Create device object for the keyboard. // ntStatus = IoCreateDevice( DriverObject, 0, NULL, FILE_DEVICE_KEYBOARD, 0, FALSE, &DeviceObject ); if( !NT_SUCCESS(ntStatus) ) { JKBD_DbgPrint(("JKBD: Keyboard hook failed to create device!\n")); return ntStatus; } // // Keyboard uses buffered I/O so we must as well. // DeviceObject->Flags |= DO_BUFFERED_IO; // // Attach to the keyboard chain. // ntStatus = IoAttachDevice( DeviceObject, &ntUnicodeString, &pGlobalDevExt->KbdDevice ); if( !NT_SUCCESS(ntStatus) ) { JKBD_DbgPrint(("JKBD: Connect with keyboard failed!\n")); IoDeleteDevice( DeviceObject ); return ntStatus; } pGlobalDevExt->KbdFilterDevice = DeviceObject; return STATUS_SUCCESS; } // // Create a keyboard packet // KeyData = pGlobalDevExt->RawKbdIrp->AssociatedIrp.SystemBuffer; RtlZeroMemory(KeyData, 2*sizeof(KEYBOARD_INPUT_DATA)); KeyData[numKeys].Flags = 0; //down KeyData[numKeys+1].Flags = 1; //up KeyData[numKeys].MakeCode = 0x1e; // character a KeyData[numKeys+1].MakeCode = 0x1e; // character a numKeys += 2; KeyData += numKeys*sizeof(KEYBOARD_INPUT_DATA); pGlobalDevExt->RawKbdIrp->IoStatus.Status = STATUS_SUCCESS; pGlobalDevExt->RawKbdIrp->IoStatus.Information = numKeys*sizeof(KEYBOARD_INPUT_DATA); pGlobalDevExt->RawKbdIrpPending = FALSE; IoCompleteRequest(pGlobalDevExt->RawKbdIrp, IO_KEYBOARD_INCREMENT); Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52017
  - 4
    - DVD_BCA_DESCRIPTOR hi friends, I want to query the BCA information from the DVD that is BCA enabled. This is the following code i did, please tell me whether this is correct or not. DWORD dwReturned = 0; HANDLE hfile = NULL; SetDlgItemText( IDC_EDIT_BCA_VALUE, NULL); hfile = CreateFile("\\\\.\\E:",GENERIC_READ, FILE_SHARE_READ,NULL, OPEN_EXISTING, FILE_ATTRIBUTE_READONLY,NULL); TRACE("Load disk File handle Value %d\n", hfile); if( hfile == INVALID_HANDLE_VALUE ) return; DeviceIoControl(hfile, IOCTL_DISK_LOAD_MEDIA, NULL, 0, NULL, 0, &dwReturned, 0); ///*DVD_ Sleep(3000); DVD_READ_STRUCTURE read_struct; DVD_BCA_DESCRIPTOR bcaDesc; //DVD_COPYRIGHT_DESCRIPTOR copyright; DVD_LAYER_DESCRIPTOR layer; //DVD_MANUFACTURER_DESCRIPTOR manufacturer; DWORD bytes_read, err; HRESULT hr = S_OK; ((long*) &read_struct.BlockByteOffset)[0] = 0; ((long*) &read_struct.BlockByteOffset)[1] = 0; long session = 0; hr = DeviceIoControl (hfile, IOCTL_DVD_START_SESSION, 0, 0, &session, sizeof (session), &bytes_read, 0); if( FAILED( hr )) return; read_struct.SessionId = session; read_struct.LayerNumber = 0; //layer.BCAFlag =0; //layer.BookVersion = 0; read_struct.Format = DvdPhysicalDescriptor; hr = DeviceIoControl (hfile, IOCTL_DVD_READ_STRUCTURE, &read_struct, sizeof (read_struct), &layer, sizeof (layer), &bytes_read, 0); if( FAILED( hr )) { err = GetLastError(); //exit (1); } TRACE("Disk Layer BCAFlag %d\n", layer.BCAFlag ); if( layer.BCAFlag != 0 ) { read_struct.Format = DvdBCADescriptor; hr = DeviceIoControl (hfile, IOCTL_DVD_READ_STRUCTURE, &read_struct, sizeof (read_struct), &bcaDesc, sizeof (bcaDesc), &bytes_read, 0); if( FAILED( hr )) { err = GetLastError(); //exit (1); } TRACE("BCA Data %s\n", bcaDesc.BCAInformation); if( size_t(bcaDesc.BCAInformation) > 0 ) SetDlgItemText( IDC_EDIT_BCA_VALUE, (LPCTSTR)bcaDesc.BCAInformation ); } hr = DeviceIoControl (hfile, IOCTL_DVD_END_SESSION, &session, sizeof (session), 0, 0, &bytes_read, 0); if( FAILED( hr )) { //exit (1); } ////DeviceIoControl(hfile, IOCTL_DISK_EJECT_MEDIA, NULL, 0, //// NULL, 0, &dwReturned, 0); CloseHandle( hfile ); -- thnaks iyappan Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52014
  - 5
    - Floating Point Operations This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C49FDF.B83C9D00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi All, DDK says that "Floating point arithmetic is not otherwise supported = in the Windows NT kernel code." but i was able to execute a small piece of code which does float = operations. VOID Floatops() { int decimal, sign; char *buffer; double a =3D 22.00,b =3D 7.0,c=3D0; c =3D a/b; buffer =3D _fcvt( c, 7, &decimal, &sign ); // uses libc.lib = for linking KdPrint(( "Value: '%s' Decimal: %d sign: %d\n",buffer, = decimal, sign )); } which neatly calculcated the value.To fix the linking issues i said=20 extern int _fltused =3D 0; I just wanted to know 1.what are the implications of doing such a thing,do the float values = get corrupted over time=20 i.e due to some other operations 2.Do i have to use the KeSaveFloatXXX and Restore routines,to perform = float operations in a "safe" way. 3.When I say "extern int _fltused =3D0;" ,is it a valid thing to do.what = is _fltused ?? where does it come from, what is being linked that uses this Regards, Manohar ------=_NextPart_000_0022_01C49FDF.B83C9D00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#c8e0d8 background=3D""> <DIV><FONT face=3DArial size=3D2>Hi All,<BR><BR>    DDK = says that=20 "Floating point arithmetic is not otherwise supported in the Windows NT = kernel=20 code."<BR>    but i was able to execute a small = piece of=20 code which does float operations.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial = size=3D2></FONT><FONT=20 face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT = face=3DArial=20 size=3D2></FONT><BR><FONT face=3DArial size=3D2>   VOID=20 Floatops()<BR>   {<BR>      =      int=20 decimal, sign;<BR>    =        char=20 *buffer;<BR>          &= nbsp;double=20 a =3D 22.00,b =3D 7.0,c=3D0;<BR>   =20        c =3D=20 a/b;<BR>           = buffer =3D=20 _fcvt( c, 7, &decimal, &sign ); // uses libc.lib for=20 linking<BR>          =20 KdPrint(( "Value: '%s' Decimal: %d sign: %d\n",buffer, decimal, sign=20 ));<BR>  }</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2> which neatly calculcated the = value.To fix the=20 linking issues i said </FONT></DIV> <P><FONT face=3DArial size=3D2> extern int _fltused =3D = 0;</FONT></P> <P><FONT face=3DArial size=3D2>I just wanted to know</FONT></P> <DIV><FONT face=3DArial size=3D2>1.what are the implications of doing = such a =20 thing,do the float values get corrupted over time </FONT></DIV> <DIV><FONT face=3DArial size=3D2>  i.e due to some other=20 operations</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial = size=3D2></FONT><BR><FONT=20 face=3DArial size=3D2>2.Do i have to use the KeSaveFloatXXX and Restore = routines,to=20 perform float operations in a "safe" way.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>3.When I say "extern int _fltused = =3D0;" ,is it a=20 valid thing to do.what is _fltused ?? where does it come = from,</FONT></DIV> <DIV><FONT face=3DArial size=3D2>   what is being linked = that uses=20 this</FONT><BR><BR><FONT face=3DArial=20 size=3D2>Regards,<BR>Manohar</FONT></DIV></BODY></HTML> ------=_NextPart_000_0022_01C49FDF.B83C9D00-- Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52008
  - 6
    - WZC vs OID_802_11_SSID... hi, I'm building my wireless lan driver and encounter the following situation: After I've finished to connect to AccessPoint, and PING is working normally. After couple of minitus, I will receive OID_802_11_SSID again. I don't know why WZC send this OID to me again, but if I use my utility(just like WZC) it works well. That means I wouldn't receive this OID under my utility when PING is ok. Could somebody tell me when will WZC send OID_802_11_SSID(ssid field included the name in Perferred Networks) again? If my connection is established, it seems WZC shouldn't send this OID to me? Any help, thank you very much. -RedOctober Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 52000
  - 7
    - Oney's spinlock sample code. I tryed to compile the spinlock sample code of the Oney's book with .NET. 2002 and with Whidbey C++ Express The compiler complains though: DriverEntry.obj : error LNK2019: unresolved external symbol @__security_check_cookie@4 referenced in function "long __stdcall AddDevice(struct _DRIVER_OBJECT *,struct _DEVICE_OBJECT *)" (?AddDevice@@YGJPAU_DRIVER_OBJECT@@PAU_DEVICE_OBJECT@@@Z) objchk_wxp_x86\i386\spinlock.sys : fatal error LNK1120: 1 unresolved externals I'd be grateful if You could explain me. Regards. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51981
  - 8
    - Fucntional USB driver launching USBPRINT with error. All please help me to solve this to me tricky problem. I have an USB printer which don't report the correct class id. The printer reports USB\Class_ff and my driver replaces this string with USB\Class_07 when enumerated. This makes the USBPRINT system to launch exactly as I want, until USB print starts the PDO. In my PDO (I call it my Virtual PDO due to the fact it tunnels all trafik down to the real PDO which has the wrong class id) IRP_MN_START_DEVICE I complete the IRP and returns STATUS_SUCCESS. I then expect USBPRINT to be started, but no way. USBPRINT send an IRP_MN_REMOVE_DEVICE, why????? This makes every thing fail. What have I forgotten in my IRP_MN_START_DEVICE so that USBPRINT doesn't send a remove device IRP? Below is the dbg print from WindDbg. The PDO dispatch is in the file pdo.c which is called after device relations have been served by pnp.c (FDO dispatch). lkd> !dbgprint 'USBLarsa-2> DriverEntry 'USBLarsa-2> AddDevice: drvObj=82295D28h, pdo=8205D9B8h 'USBLarsa-2> CreateOurVirtual: drvObj=82295D28h, pdo=8205D9B8h virtualpdo=8229EE80h 'USBLarsa-2> pnp.c - IRP_MN_QUERY_LEGACY_BUS_INFORMATION 'USBLarsa-2> pnp.c - IRP_MN_QUERY_RESOURCE_REQUIREMENTS 'USBLarsa-2> pnp.c - IRP_MN_FILTER_RESOURCE_REQUIREMENTS 'USBLarsa-2> pnp.c - IRP_MN_START_DEVICE 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pnp.c - IRP_MN_QUERY_CAPABILITIES 'USBLarsa-2> pnp.c - IRP_MN_QUERY_PNP_DEVICE_STATE 'USBLarsa-2> pnp.c - IRP_MN_QUERY_DEVICE_RELATIONS 'USBLarsa-2> Relation string : BusRelations 'USBLarsa-2> pdo.c - IRP_MN_QUERY_ID 'USBLarsa-2> pdo.c - IRP_MN_QUERY_CAPABILITIES 'USBLarsa-2> pdo.c - IRP_MN_QUERY_DEVICE_TEXT 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_QUERY_DEVICE_TEXT 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_QUERY_ID 'USBLarsa-2> pdo.c - IRP_MN_QUERY_ID 'USBLarsa-2> pdo.c - IRP_MN_QUERY_ID 'USBLarsa-2> DoQueryID_PDO 'USBLarsa-2> BusQueryCompatibleIDs 'USBLarsa-2> pdo.c - IRP_MN_QUERY_RESOURCE_REQUIREMENTS 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_QUERY_BUS_INFORMATION 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_QUERY_RESOURCES 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_QUERY_CAPABILITIES 'USBLarsa-2> pdo.c - IRP_MN_QUERY_LEGACY_BUS_INFORMATION 'USBLarsa-2> pdo.c - IRP_MN_QUERY_RESOURCE_REQUIREMENTS 'USBLarsa-2> CallNextDriverSync 'USBLarsa-2> CallDriverSync 'USBLarsa-2> CallDriverSyncCompletion 'USBLarsa-2> pdo.c - IRP_MN_FILTER_RESOURCE_REQUIREMENTS 'USBLarsa-2> pdo.c - IRP_MN_START_DEVICE 'USBLarsa-2> pdo.c - IRP_MN_REMOVE_DEVICE Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51978
  - 9
    - MULTIPLE_IRP_COMPLETE_REQUEST stop error Hello, I have written a usb client driver , and am using it on 2k/XP. when i open a handle to the driver from user mode and close the handle , and later form the task bar , i click on safely remove hardware , and then stop the device, then BSOD with MULTIPLE_IRP_COMPLETE_REQUEST comes up. The error does not come up if: 1) a handle to the driver was not opened 2) If i remove the device abruptly by pulling out the usb wire any clues on how to debug this ? are there any kd commands helpful for debugging this issue? thanks Taha Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51969
  - 10
    - Enumerating USB Ports Hi, If SetupDiClassGuidsFromName is called to get GUID for class "USB", SetupDiEnumInterfaceDevice always return false though there are 4 USB ports available. and if SetupDiClassGuidsFromName is called to get GUID for class "Ports", its listing only 2 though there are 4 USB ports. (Devices are attached in both the cases.) Sample Code: ---------------------------------------------------------------------------- ------------------------------------------------------------------------ var RequiredSize: Cardinal; vDeviceList : OleVariant Guid: TGUID; DevInfoHandle: HDEVINFO; // Comments DeviceInfoData: TSPDevInfoData; MemberIndex: Cardinal; PropertyRegDataType: DWord; RegProperty: Cardinal; RegTyp: Cardinal; Key: Hkey; Info: TRegKeyInfo; S1,S2: string; hc: THandle; hLib : HINST; needed : DWORD; hINfo : HDEVINFO; Interface_Info : TSPDeviceInterfaceData; interface_detail : PSPDeviceInterfaceDetailData; sdname : pChar; strDeviceName : String; vattachedUSBList : OleVariant; slDynamicBuil : TStringList; begin try try if SetupDiClassGuidsFromName('Ports',@Guid,RequiredSize,RequiredSize) then // get 'Ports' class guid from name begin DevInfoHandle :=SetupDiGetClassDevs(@Guid,Nil,0,DIGCF_INTERFACEDEVICE);//());//get object handle of 'Ports' class to interate all devices if Cardinal(DevInfoHandle)<>Invalid_Handle_Value then begin try MemberIndex:=0; repeat //iterate device list Interface_Info.cbSize := SizeOf(_SP_DEVICE_INTERFACE_DATA); //28; //SizeOf(Interface_Info) 28; if (not SetupDiEnumInterfaceDevice(DevInfoHandle, nil,Guid,MemberIndex,Interface_Info)) then begin SetupDiDestroyDeviceInfoList(DevInfoHandle); break; end; SetupDiGetInterfaceDeviceDetail(DevInfoHandle, @Interface_Info, nil, 0, @needed, nil); interface_detail := AllocMem(needed); interface_detail.cbSize := SizeOf(_SP_DEVICE_INTERFACE_DETAIL_DATA_A); //5; //SizeOf(interface_detail) 5; SetupDiGetInterfaceDeviceDetail(DevInfoHandle,@Interface_Info,interface_deta il, needed,@needed, 0); sdName := StrAlloc(MAX_PATH); StrCopy(sdName,interface_detail.DevicePath); VarArrayRedim(vDeviceList,MemberIndex); vDeviceList[MemberIndex] := StrPas(sdName); FreeMemory(interface_detail); Inc(MemberIndex); until False; finally SetupDiDestroyDeviceInfoList(DevInfoHandle); end; end; end; finally // Result := vUSBList; end; except on E:Exception do ShowMessage(e.Message); end; Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51964
  - 11
    - Enumerating USB ports I am trying to open cash drawer which is connected to Reciept printer (Printer is connected to USB port of CPU). We want to automatically detect the PORT for the selected printer. This works fine using "GetPrinter" WinAPI (populating _PRINTER_INFO_2A structure). And it displays USB002. To open cash drawer we use "CreateFile" and "WriteFile" WIN APIs. These functions work fine if PORT is of LPT/COM, but if its USB, it throws invalid handle. To interact with USB, we need to send DevicePath. Using SetupDiClassGuidsFromName, SetupDiGetClassDevs, SetupDiEnumInterfaceDevice, SetupDiGetInterfaceDeviceDetail of "SetupAPI.dll", we can enumerate available interface devices and can get DevicePath. But how do we map this strange DevicePath with Port name ? For example, For port USB002, how do I get respective DevicePath ? Thanks in advance, Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51963
  - 12
    - calculate CPU cycles Is there an API that I can tap into from an NT Service that will allow me to get an estimated CPU clock cycles it takes to do X code? I have to do reports on performance and we normally do GetTickCount() but I need someone closer to the CPU Cycle level. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51961
  - 13
    - HELP! I enrolled in device driver class. My employer has purchased one week's training next week for device driver development. This is all to my suprise because I have been asking for the training for well over two years now. My only problem is that have been developing NT Services (with great success) but have never been able to get my head wrapped around device drivers and their architecture. I really need some help and I am out of time (almost). What book or on-line reference can I go to that will help me prepare for this class? I just have 6 days for prep and I feel very behind. I'm not even really sure what the different kinds of device drivers there are or what kinds of things that I can do with them. When complete with the course I am expected to work on a few projects that would either require several messy NT Services (polling and scanning) or just a few device drivers. Unfortunately, my understanding of device drivers is so limited that I'm not even sure if I'm right. I need some materials and I need them fast!!! thank you for all your help! Please do not respond via email directly because my current web connection (linux) does not like my email at this point but newgroups are awesome. All of my other machines are Windows flavors but my internet connection is linux and the only thing the stinking thing does not like is my email. Also, if someone is cross-platform savvy and wants to point me to a place that can outline a device driver in linux that might be interesting. THANKS!!!!!! Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51960
  - 14
    - is it possible (fake file) I would like to attempt to create a "fake file" where when you do a 'dir' or subsuquent command it shows the file and all the normal information for a file. I can even open the file in notepad or such but the file must remain as read-only at all times. The reason is that when someone opens the file at that point they are reading a snapshot report of status items of their machine ... like maybe memory and hard drive space and current CPU status. A "copy" of this file to a new location is not necessary but would be nice. To get the contents of this file from fake status to real status I would just say "type fake.file > real.file" and it would be created. Another possible choice would be to have a notification I guess when the file is opened and at that point I generate a file in memory and give the opening application a handle to that file and not the actual file. I am new to device drivers but not to C++ and I create NT Services all the time. My current design uses an NT Service to generate this file but it would be much more effective if I could create this "fake file" for reasons not entirely outlined above. The only operating system that I plan on running this on is Windows 2000 Server/Professional or greater. thanks!! Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51958
  - 15
    - Threads' blocking I'm new in Kernel Programming. I'm reading the Oney's book. I don't understand where he say that at a certain irql threads can't be blocked. I'd be grateful if you could give me only only an idea about that. Regards. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51957
  - 16
    - SetupDiEnumDeviceInterfaces Problem Calls to SetupDiEnumDeviceInterfaces fail to locate my device for which I've created a class GUID. Here's a sample call, with the index set to 0, just for test. SP_DEVICE_INTERFACE_DATA ifdata; ifdata.cbSize = sizeof( SP_DEVICE_INTERFACE_DATA ); BOOL Found = SetupDiEnumDeviceInterfaces(info, NULL, &m_InterfaceGUID, 0, &ifdata); Note that info is a handle that was sucessfully returned by a call to SetupDiGetClassDevs Found evaluates to zero and GetLastError returns 0x00000103 ("No more data is available"). I'm scratching my head, wondering why. Can someone suggest a cause of the problem? Thanks, Dennis Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51955
  - 17
    - Serial Upper Filter Driver Help Required Hi, This is my first driver project. I need to write an upper filter driver for a serial port which is dynamically loaded from a test application when required. The driver will be loaded by means of the Service Control Manager and the driver will connect to the serial port by means of a special "start" IOCTL call from the test application using the DeviceIoControl() function, this will pass the name of the serial port device i.e. \??\COM4". The driver will attach to the named device leaving it in a state where it can still be opened by a 3rd party application. When loaded the driver will monitor incoming and outgoing data on the port and pass it back to the test application. I have used two of Walt Oney's sample projects as a starting point for my code. My driver loads and unloads OK but when I attempt to open the serial port from a 3rd party application (Hyperterminal in this case) I get a bugcheck as described below. I have included here the "bones" of the DriverEntry, AddDevice and DispatchAny functions. The bugcheck occurs at point XXX at the bottom of the DispatchControl function. I guess I have "broken" the IRP in some way but I don't know how. I can't see what the problem is but I am hoping that someone on this group will be able to see what I can't. Any help will be gratefully received. Sorry for such a long post. Many thanks O.C. **** DriverEntry Funtion extern "C" NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,IN PUNICODE_STRING RegistryPath) { // Save the name of the service key servkey.Buffer = (PWSTR) ExAllocatePool(PagedPool, RegistryPath->Length + sizeof(WCHAR)); if(!servkey.Buffer) return STATUS_INSUFFICIENT_RESOURCES; servkey.MaximumLength = RegistryPath->Length + sizeof(WCHAR); RtlCopyUnicodeString(&servkey, RegistryPath); servkey.Buffer[RegistryPath->Length / 2] = 0; // Initialize function pointers DriverObject->DriverUnload = DriverUnload; for (int i = 0; i < arraysize(DriverObject->MajorFunction); ++i) DriverObject->MajorFunction[i] = DispatchControl; DriverObject->MajorFunction[IRP_MJ_CREATE] = DispatchCreate; DriverObject->MajorFunction[IRP_MJ_CLOSE] = DispatchClose; // Create a device object to allow an associated application to open a handle // in order to send us IOCTL requests status = AddDevice(DriverObject); if(!NT_SUCCESS(status)) DriverUnload(DriverObject); return status; } **** AddDevice Function NTSTATUS AddDevice(IN PDRIVER_OBJECT DriverObject) { PAGED_CODE(); KdPrint((DRIVERNAME " AddDevice(%8.8lX) - Start\n", DriverObject)); NTSTATUS status; // Create a function device object to represent the hardware we're managing. PDEVICE_OBJECT fdo; UNICODE_STRING devname; RtlInitUnicodeString(&devname, L"\\DosDevices\\NetMonSerW2kD"); status = IoCreateDevice(DriverObject, sizeof(DEVICE_EXTENSION), &devname, FILE_DEVICE_SERIAL_PORT, FILE_DEVICE_SECURE_OPEN, FALSE, &fdo); if (!NT_SUCCESS(status)) { KdPrint((DRIVERNAME " - IoCreateDevice failed - %X\n", status)); return status; } PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; // From this point forward, any error will have side effects that need to // be cleaned up. do { pdx->DeviceObject = fdo; pdx->DriverObject = DriverObject; InitializeListHead(&pdx->registered); InitializeListHead(&pdx->events); KeInitializeSpinLock(&pdx->eventlock); // Make a copy of the device name pdx->devname.Buffer = (PWCHAR) ExAllocatePool(NonPagedPool, devname.MaximumLength); if (!pdx->devname.Buffer) { // can't allocate buffer status = STATUS_INSUFFICIENT_RESOURCES; KdPrint((DRIVERNAME " - Unable to allocate %d bytes for copy of name\n", devname.MaximumLength)); break;; } // can't allocate buffer pdx->devname.MaximumLength = devname.MaximumLength; RtlCopyUnicodeString(&pdx->devname, &devname); // Not sure about this bit. KeInitializeEvent(&pdx->RemoveLock.evRemove, NotificationEvent, FALSE); pdx->RemoveLock.usage = 1; pdx->RemoveLock.removing = FALSE; } while (FALSE); if(!NT_SUCCESS(status)) { if (pdx->devname.Buffer) RtlFreeUnicodeString(&pdx->devname); IoDeleteDevice(fdo); } return status; } **** DispatchControl Function NTSTATUS DispatchControl(PDEVICE_OBJECT fdo, PIRP Irp) { PAGED_CODE(); PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; NTSTATUS status = STATUS_SUCCESS; ULONG info = 0; PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp); ULONG cbin = stack->Parameters.DeviceIoControl.InputBufferLength; ULONG cbout = stack->Parameters.DeviceIoControl.OutputBufferLength; ULONG code = stack->Parameters.DeviceIoControl.IoControlCode; KdPrint(("\n"DRIVERNAME " DispatchControl() - Irp=%08X IOCTL = %08X\n",Irp,code)); switch(code) { case IOCTL_NETMON_STARTMON: { // Copy passed-in data to a unicode string. // (This will be something like "\??\COM4"). UNICODE_STRING PortName; WCHAR wPortName[32]; swprintf(wPortName,(WCHAR*)Irp->AssociatedIrp.SystemBuffer,cbin); RtlInitUnicodeString(&PortName,wPortName); PFILE_OBJECT FileObject = NULL; // Will be filled in with pointer to a file object. PDEVICE_OBJECT DeviceObject = NULL; // Will be filled in with pointer to a device object. status=IoGetDeviceObjectPointer(&PortName, FILE_READ_DATA, &FileObject, &DeviceObject); if(status!=STATUS_SUCCESS) { KdPrint((DRIVERNAME " DispatchControl() - Error=%08X\n",status)); break; } // "\??\COM4" if(!FileObject) break; if(!DeviceObject) break; pdx->Pdo = DeviceObject; // The current device. // Now attach our device to the device stack. // Attach our object (which we created with IoCreateDevice() in the // AddDevice() function and which has been passed to us as the "fdo" // parameter) to the object we just obtained a pointer to. // Save a pointer to the device beneath us so we can pass stuff on to it. // Attach OUR device object (fdo) to the curent device (ie for COM4). pdx->LowerDeviceObject = IoAttachDeviceToDeviceStack(fdo,DeviceObject); // Stuff from page 781 of Walt's book... fdo->Flags |= pdx->LowerDeviceObject->Flags & (DO_DIRECT_IO | DO_BUFFERED_IO | DO_POWER_PAGABLE); if(!pdx->LowerDeviceObject) { KdPrint((DRIVERNAME " DispatchControl() - Failed to attach\n")); ObDereferenceObject(FileObject); break; } ObDereferenceObject(FileObject); // Close port again. status = STATUS_SUCCESS; info = 0; KdPrint((DRIVERNAME " DispatchControl() - IOCTL_NETMON_STARTMON (End)\n")); break; } /***********/ /* Default */ /***********/ default: KdPrint((DRIVERNAME " DispatchControl() - Default Start\n")); static char* irpname[] = { "IRP_MJ_CREATE", "IRP_MJ_CREATE_NAMED_PIPE", "IRP_MJ_CLOSE", "IRP_MJ_READ", "IRP_MJ_WRITE", "IRP_MJ_QUERY_INFORMATION", "IRP_MJ_SET_INFORMATION", "IRP_MJ_QUERY_EA", "IRP_MJ_SET_EA", "IRP_MJ_FLUSH_BUFFERS", "IRP_MJ_QUERY_VOLUME_INFORMATION", "IRP_MJ_SET_VOLUME_INFORMATION", "IRP_MJ_DIRECTORY_CONTROL", "IRP_MJ_FILE_SYSTEM_CONTROL", "IRP_MJ_DEVICE_CONTROL", "IRP_MJ_INTERNAL_DEVICE_CONTROL", "IRP_MJ_SHUTDOWN", "IRP_MJ_LOCK_CONTROL", "IRP_MJ_CLEANUP", "IRP_MJ_CREATE_MAILSLOT", "IRP_MJ_QUERY_SECURITY", "IRP_MJ_SET_SECURITY", "IRP_MJ_POWER", "IRP_MJ_SYSTEM_CONTROL", "IRP_MJ_DEVICE_CHANGE", "IRP_MJ_QUERY_QUOTA", "IRP_MJ_SET_QUOTA", "IRP_MJ_PNP", }; UCHAR type = stack->MajorFunction; if (type >= arraysize(irpname)) KdPrint((DRIVERNAME " Unknown IRP, major type %X\n", type)); else KdPrint((DRIVERNAME " %s\n", irpname[type])); // Pass request down without additional processing NTSTATUS status; KdPrint((DRIVERNAME " DispatchControl() Def - Calling IoAcquireRemoveLock(%08X,%08X)\n",pdx->RemoveLock,Irp)); status = IoAcquireRemoveLock(&pdx->RemoveLock,Irp); KdPrint((DRIVERNAME " DispatchControl() Def - IoAcquireRemoveLock() acquired %08X and returns %08X\n",pdx->RemoveLock,status)); if (!NT_SUCCESS(status)) return CompleteRequest(Irp, status, 0); // If there is no lower device object supplied. if(pdx->LowerDeviceObject==NULL) { KdPrint((DRIVERNAME " DispatchControl() Def - No LDO so exit now\n")); status=STATUS_SUCCESS; break; } IoSkipCurrentIrpStackLocation(Irp); KdPrint((DRIVERNAME " DispatchControl() Def - Calling IoCallDriver(%08X,%08X)\n",pdx->LowerDeviceObject,Irp)); status = IoCallDriver(pdx->LowerDeviceObject,Irp); KdPrint((DRIVERNAME " DispatchControl() Def - IoCallDriver() returns %08X\n",status)); if(Irp) { IoReleaseRemoveLock(&pdx->RemoveLock,Irp); } KdPrint((DRIVERNAME " DispatchControl() Def - End\n")); break; } XXX Bugcheck DRIVER_PAGE_FAULT_IN_FREED_MEMORY_POOL when next instruction is executed. The Irp pointer is still the same so I guess the memory it points to has been released. Irp->IoStatus.Status = status; Irp->IoStatus.Information = info; IoCompleteRequest(Irp, IO_NO_INCREMENT); return status; } // DispatchControl Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51949
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    - how to use a system DMA channel? hello, Everybody, I am writing a PCI driver. In this device ,there is no Pci interface chip, so I need to get a system DMA channel. But I don't konw how.In the pnp start IRP£¬there is no DMA resource for me to use. Another question is that how to use the system DMA channel? I know if the device has got its own dma channel,usually,I can set the start address,and counter,and trigger the DMA. But using system DMA channel, how to do these thing? Any advice or disscusion is welcome. sean Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51948
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    - Show the "safe removal" dialog Is there an API to show the dialog programmatically? Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51947
  - 20
    - Performance question Hi, is it better (regarding the performance) to copy one large buffer via RtlCopyMemory or to copy some small buffer several times? Is there a tool that can do performance monitoring for drivers? Thanks a lot Peter Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51945
  - 21
    - USB to MIDI QUESTION BY NUBIE I am trying to use the FTDI232BM USB to serial chip in a MIDI application. The FT232BM chip comes with a WDM usb driver and API (FT_Write(lngHandle, strWriteBuffer, LENGTH_MESSAGE, lngBytesWritten))that I can use to send midi data to the chip and it will convert to MIDI serial output. I would like to use the windows MIDI API functions like IRET = midiOutShortMsg(MIDI_OUT_HANDLE, MIDIMSG). My question is what do I have to do to have the FT232BM chip recognized as a MIDI device? Why do I want it to be recognized as a MIDI device when I can already send midi data to it? So that CAKEWALK and other musical applications can use it. Thanks in advance for your input. Bob Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51939
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    - ISA Device Driver We are porting Device Control software from MSDOS to Windows 98 and need to write a Device Driver for a legacy ISA Interface Card with Visual C++ 5.0 and the Windows 98 DDK (Driver Development Kit). The sample ISA Device Driver in Chapter 7 of Walter Oney's book "Programming the Microsoft Windows Driver Model" works fine after adding an Interrupt Handler. However, my Device Driver will not install properly (Device Manager error code 2 and does not even call AddDevice or DriverEntry) unless Walter Oney's sample is installed first. The sample does not install properly either but any ideas how to fix this problem to make my Device Driver install independently ? Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51938
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    - [newbie] Linked list problem Hi again, just one question: How can I read a kernel double linked list in reverse order? Or, better to say, how can I access the 'last' (the item that linkes to the head again) item, if all I got is a pointer to the head? I've tried this one, but it doesn't seem to work: lastitem = CONTAINING_RECORD(DoubleHead.Blink,MYSTRUCT, linkfield); Any ideas? Thanks a lot Peter Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51936
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    - [Q] Many problems installing DDK I'm having a great deal of difficulty getting the Windows Server 2003 DDK to install correctly. I'd like to know if I'm doing something wrong and be set straight. (1) Attempting to build the samples in the kit fails, i.e., several of the samples fail with [relatively minor] errors: bin\x86\prefast\examples\pft-example2.cpp(17) : error C4700: local variable 'a' used without having been initialized bin\x86\prefast\examples\pft-example1.cpp(14) : error C4700: local variable 'j' used without having been initialized Granted, these are trivial but the docs say that the kit should build with no warnings or errors. Hence, my uncertainty as to the quality of the distribution. (2) The setenv.bat file, on line #254, sets an environment variable as follows: set _LINK_=/Tmp This causes the linker to fail because the file "/Tmp" can not be found. What is the _LINK_ symbol used for? This symbol occurs nowhere else in any makefile. *.def, or sources file. As far as I can tell, it's only purpose is to make my life difficult [:-) (3) Finally, when trying to link a simple user-mode application, the linker fails with a LNK4099 message: warning LNK4099: PDB 'mfcs42d.pdb' was not found with 'C:\local\sde\lib\winddk\3790\lib\wxp\i386\mfcs42d.lib' However, mfcs42d.pdb is nowhere in the DDK tree and nowhere on my system. Can someone help my out here? My dev and target platform are XP-Pro. Cheers, Michael Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51933
  - 25
    - Linked list in kernel mode Hi, I wrote the following code to walk a linked list: >LIST_ENTRY DoubleHead; //points to the head of the double-linked > list, initialized > > [...] > PLIST_ENTRY plistentry = NULL; > PMYSTRUCT pmystruct = NULL; > > if(!IsListEmpty(&DoubleHead)) > { > plistentry = DoubleHead.Flink; > while(plistentry != &DoubleHead) > { > pmystruct = CONTAINING_RECORD(plistentry, MYSTRUCT, > linkfield); > > [...]//Doing some checking with pmystruct here > plistentry = plistentry->Flink;//next one > } > } > Now, the problem is: although the list is filled with valid members (not shown), when I check the items that way, 'pmystruct' contains only invalid members. What am I doing wrong? Thanks a lot Peter Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51926
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  - 1
    - How can we retrieve a postscript file information? Hello. I'm developing postscript driver plug-ins. I know that PScript5.dll makes poscript file information with print data stream from GDI information. I want to know how can I retrieve the postscript file information in rendering plug-in. Thanks, Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51925
  - 2
    - Creative WebCam NX Ultra & WIA Has anyone ever figured out how to access the Creative WebCam NX Ultra through the WIA scripting object model? The documentation on the WebCam NX Ultra says it is WIA compliant, but I am unable to access it. Here is the simple script that I have been using to test the camera which results in message boxing a zero. BTW-I called the Creative technical support, and they told me that as long as their application worked it was up to Microsoft to get the WIA api working. Another point, I hooked up a Canon 400S still camera (WIA compliant) to the same computer and it worked just fine. 'Testing Script Dim objWia Set objWia = CreateObject("Wia.Script") msgbox objWia.Devices.Count Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51917
  - 3
    - Purging System of Driver Junk I've been experimenting with USB driver development for a few months now, including "from-scratch" and using existing off-the-shelf drivers and tools. I'd like to completely purge my system of all accumulated junk related to these experiments. I figure I could do it as follows: 1) Browse the registry and remove all folders and symbolic links that contain my vendor and product ID?. 2) Search for and delete all .sys and .inf files that are specific to my driver. Is this the proper approach? Other suggestions? Thanks in advance for the help, Dennis Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51914
  - 4
    - RtlStringCbVPrintfExW linking error under Win2k Hi, I used RtlStringCbVPrintfExW routine, and it was built ok under Windows XP and Windows Server 2003. But I got the linking error under Windows 2000: my.obj : error LNK2019: unresolved external symbol __imp___vsnwprintf referenced in function _RtlStringVPrintfWorkerW@16 objchk_w2k_x86\i386\netvmini.sys : error LNK1120: 1 unresolved externals Does Windows 2000 not support that routine? PS. I have set the ntstrsafe.lib in my sources file: TARGETLIBS=$(DDK_LIB_PATH)\ndis.lib \ $(DDK_LIB_PATH)\ntstrsafe.lib Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51911
  - 5
    - UpdateDriverForPlugAndPlayDevices and SetupCopyOEMInf on Windows Hi, from what I gathered, the two following functions: UpdateDriverForPlugAndPlayDevices and SetupCopyOEMInf are not supported on Windows 98. I am writing a device installation app and I'd like to know how I can deal with it on 98? Preinstalling the drivers on a computer with no previous version of them would not be an absolute requirement: I can have the users install them manually when the device is first plugged in. But upgrading the drivers if necessary is an absolute *must*. And I have no clue how to do that programmatically on Windows 98. Any idea? I don't want to have to let the users upgrade the drivers manually: that would be too much of a hassle. Just to make things more precise, the device is an USB device: which means it can be plugged in when the installation occurs, or it can be unplugged... what I have written so far is fine on Windows 2000/XP/2003 (Me? not sure yet...). Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51909
  - 6
    - How to install a filter driver without restart? Hello, I am writing a filter driver for a USB device. I have followed the DDK instructions and produced an INF that installs the driver. However, The installation takes effect only after I restart the machine. Is there a way to install (and uninstall) a driver without the need for restart? The device for which the filter driver was written is installed and running at the time I execute the filter driver installation. This means that the device stack has to be restarted somehow. How can this be done? Thanks, Nir Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51908
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    - Video Display Mirror Driver hi all i am intersted in a Video Display Mirror Driver. is there anyone here who has developed such a beast? is anyone interested? please contact me for more information. assaf assafwo@hotmail.com Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51905
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    - Confused about Kernel Streaming / DShow clocks... Hi folks, Just a quick post to see if someone can clarify my understanding of kernel streaming clocks.- I think I've got the basics, but there are a few loose ends... I've got a multimedia card with separate audio and video capture drivers written under the stream class driver. At the moment, the captured audio & video has a habit of drifting out of sync, so I need to put clock support into the drivers. Additionally, the hardware has 27 MHz counter that can be queried to give me a very accurate clock source. As I currently understand it: a) I need to get both audio and video capture drivers to support being a master clock. b) I need to get the drivers to be able to timestamp samples based on the master clock for the graph (which might be themselves, or might be from somewhere else). Here's where I have a few questions... Q'n 1. It seems that there seem to be several ways of doing "a)" and "b)" - MSDN seems to indicate that I can do a) by including information in my HW_STREAM_OBJECT indicating that I can act as a master clock, by including appropriate clock support flags, and a callback routine (HW_CLOCK_OBJECT). - If I do that, then my clock support is going via the stream class driver. It then seems the the "similar" way of implementing b) is to use the "StreamClassQueryMasterClock" routine, using the clock handle passed to my driver via SRB_INDICATE_MASTER_CLOCK. Make sense so far? If so, then why is there also a whole load of KS Property stuff, which provide similar functionality? It seems that if I want to provide a master clock source via the KsProperty route,. then I'll have to implement KSPROPSETID_Clock, and also KS_PROPERTY_STREAM_MASTERCLOCK. Do I have to do both of these, or is it an either/or proposition, with the stream class driver doing some behind the scenes work for me in the first case? Qn 2: If I have the two filters running, and both can provide a master clock, then the audio capture driver will provide the master clock of the graph - so I need to get the other driver to timestamp samples based on the audio driver. StreamClassQueryMasterClock would seem to do the job if I want to use stream.sys, however, it's asynchronous, and it doesn't seem sensible to try and perform such a query every time a get a media sample. Any suggestions on strategies for getting the drivers to query the master clock at intervals and then interpolate? How is this normally done? Qn3: If I was to use the property set approach, instead of StreamClassQueryMasterClock, it seems that I need to get on driver to get hold of the direct call interface (KSPROPERTY_CLOCK_FUNCTIONTABLE) advertised by the other driver... how do I do that? thanks in advance, Martin Harvey. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51904
  - 9
    - question about compatiblity Hi, I have a question about the compatibility for windows device driver. ScsiWritePortUlong, for example, it writes 4 bytes data into a scsi card's register. Will the Microsoft always define ULONG to 4 bytes even in the 64 bits or higher machine? Thanks Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51901
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    - Passing a struct address to a 16-bit driver dll I have started on an installable driver dll for a midi output device. I used MSVC 1.52c to build it. It works fine under Windows 3.11, but under Windows ME the address of the midiOutCapabilities struct seems to be wrong when modMessage receives the MODM_GETDEVCAPS message. I use a MIDIOUTCAPS __far * to adress the fields in the struct at the address passed via dwParam1. Is it because I compile it with MSVC 1.52c? I thought that should be ok since it produces 16 bit code. Any other ideas? -- The next step in human evolution must be built upon compassion, cooperation and a healthy competition. That is why we all help out here. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51900
  - 11
    - how to enum the hardwares in win2000 ddk hey all , how to enum hardwares in win2000 ddk,get 'handle','hardwardId' of the listed hardwares. Any advice will be appreciated. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51898
  - 12
    - In CE.net, how to support multiple display drivers? My run-time image includes two display .dll files and I use CreateDC to enable the second display driver. But only DispDrvrInitialize() is called. GPE *GetGPE() is not called.What should I do with it? Thanks a lot! Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51891
  - 13
    - UpdateDriverForPlugAndPlayDevices hangs with HWND Hoi. I am supplying some kind of application with my driver, which gives the user the possibility of adding or removing the driver dynamically. But since I got feedback of customers, the windows driver warning window sometimes appeares behind my application window, I am working on a patch (along with a few other bugfixes) right now. To solve the problem, I thought passing a HWND to the UpdateDriverForPlugAndPlayDevices function call should be the solution. But I cannot tell exactly, because every time I pass the window handle to the function, it stops responding. The window handle is a valid one from an mfc propertysheet of a different process. This propertysheet calls a method of an com interface of an local server com object (interactive user privilegs) which is loaded by an system service. The problem appears in the UpdateDriverForPlugAndPlayDevices as I found out with the debugger. The function hangs on forever, except for the case I kill the propertysheet's app. Doing so brings the UpdateDriverForPlugAndPlayDevices function back to life, reporting an error. Does anybody have an idea what causes the problem and how to solve it, or has anybody experienced similar situations with UpdateDriverForPlugAndPlayDevices? Thanks in advance, Laurents C. R. Meyer Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51889
  - 14
    - AVStream: failed to render video outpin of TV tuner filter. Dear All, I met a problem when I tried to render my video outpin of TV tuner filter and I listed two situation as following Case 1 : Only insert TV tuner filter by GraphEdit and render the video outpin of TV tuner filter. Result : Error code 0x80040111 (ClassFactory cannot supply requested class) Case 2 : Insert TV tuner and crossbar filters by GraphEdit and render the video outpin of TV tuner filter. Result : Success to render it. What's happened on Case 1? Did I miss some settings? Any comments are appreciated. Thanks, Edward Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51888
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    - IoWriteErrorLogEntry() Behaviour Dear all, When using IoWriteErrorLogEntry() to write my driver error messages i see an extra 28 bytes of data preceeding my actual data written. Is this the default behaviour, if so what is it & how to avoid? or am i messing up something. Also how to write type=information messages in the Event logger from driver. Thanks -Vijairaj Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51887
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    - AVStream: failed to connect TV tuner and TV audio decoder filters. Dear All, I implement a TV tuner, TV audio decoder and crossbar filters. I also implement PROPSETID_TUNER, PROPSETID_VIDCAP_CROSSBAR and PROPSETID_VIDCAP_TVAUDIO property set for them. My current status is that I could connect TV video pin of tuner filter to crossbar filter successfully. But I cannot connect TV audio outpin of tuner filter to TV audio inpin of TV audio filter. What value should I set to the TVAudioMedium fileld of KSPROPERTY_TUNER_CAPS_S structure if I want to connect TV audio outpin of tuner filter to TV audio filter (not crossbar filter)? PS : I have ever tried to set the GUID of TVAudioMedium to GUID_NULL and then my tuner audio outpin of tuner filter disappear. Any comments are welcome and very appreciated. Thanks, Edward Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51886
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    - enable/disable device I want hide the SCSI adapter device form device manager or have to prevent the user to enable/disable the device in device manager . thank y veeru Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51883
  - 18
    - CHAT: Windows Kernel Plug and Play and Power Management Ask The Experts: Windows Kernel Plug and Play and Power Management Join us for an online session that focuses on kernel-mode Plug and Play and power management concerns for driver developers, best practices for power management, and test processes and tools for testing Plug and Play and power management in drivers and hardware. October 20, 2004 10:00 - 11:00 A.M. Pacific time 1:00 - 2:00 P.M. Eastern time 17:00 - 18:00 GMT Chat time for cities world-wide: http://www.timeanddate.com/worldclock/fixedtime.html?day=20&month=10&year=2004&hour=10&min=0&sec=0&p1=234&sort=1 To add this chat to you calendar: http://msdn.microsoft.com/chats/outlook_reminders/04_ATEO_WIN_KERN_PnP_Oct20.ics For more info on MSDN chats, including other upcoming developer chats, chat archives, and other info see http://www.msdn.microsoft.com/chats Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51874
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    - Problems with PCI-X cards and PAE I have a Dell Power Edge 6650 with 8 GB of RAM (/PAE in my boot.ini). I have started adding cards to the PCI-X bus and am having a great deal of trouble running the apps for them unless I disable PAE. I get error messages from the applications like: "CDA_MemoryLock failed to lock DMA buffer into physical memory (returned 0xcd0e0000)" I have tried running both Windows XP Pro and Server 2003, Enterprise Ed. With the same result. With PAE I get the messages, without PAE, the apps seem to run. Unfortunately, I need the extra memory and we were planning on going from 8 GB to 32. Any thought on what is going on? Can I ask the OS to put the cards in a certain address range? Are the apps just not able to handle pointers to the memory beyond 4 G? I have the source for the apps, but I'd like to get a handle on what the problems might be before I spend a significant amount of time blindly poking around. Thanks in advance, Marc Reinig UCO/Lick Laboratory for Adaptive Optics Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51868
  - 20
    - Accessing a file on a volume by volume name In kernel mode, is there a way to access a file on a volume with a particular Volume ID string? In user mode, I can do it with CreateFile, but I haven't been able to get it to work with ZwOpenFile. Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51866
  - 21
    - Q:Printer driver, paper information from MS Word I have a monolithic printerdriver under XP, but I can NOT seem to figure out how to read paper information from MS Word. In DrvDocumentPropertySheets, where I would expect to get the information, the DEVMODE from Word just returns my internal paper settings that I provided on first call, and I can NOT seem to force it to do otherwise. Any help ? Tag: How to read data in IRP_MJ_READ and IRP_MJ_WRITE Tag: 51864
  - 22
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Hi,

I have an upper filter driver for a serial port which can see the
various IOCTls going down to the driver from the application (i.e.
Hyperterminal) which has been loaded on top of it. I want to be able
to read the data that is being sent and received by Hyperterminal but
I can't see how to extract this. Should I be able to see this in the
SystemBuffer or the MDL? The IRP Flag DO_DIRECT_IO is set which would
suggest that the MDL is in use but the Irp->MdlAddress pointer is
NULL.

Thanks

O.C.

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