Enumerating USB ports

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  - 1
    - 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: Enumerating USB ports Tag: 51961
  - 2
    - 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: Enumerating USB ports Tag: 51960
  - 3
    - 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: Enumerating USB ports Tag: 51958
  - 4
    - 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: Enumerating USB ports Tag: 51957
  - 5
    - 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: Enumerating USB ports Tag: 51955
  - 6
    - 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: Enumerating USB ports Tag: 51949
  - 7
    - 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: Enumerating USB ports Tag: 51948
  - 8
    - Show the "safe removal" dialog Is there an API to show the dialog programmatically? Tag: Enumerating USB ports Tag: 51947
  - 9
    - 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: Enumerating USB ports Tag: 51945
  - 10
    - 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: Enumerating USB ports Tag: 51939
  - 11
    - 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: Enumerating USB ports Tag: 51938
  - 12
    - [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: Enumerating USB ports Tag: 51936
  - 13
    - [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: Enumerating USB ports Tag: 51933
  - 14
    - 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: Enumerating USB ports Tag: 51926
  - 15
    - 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: Enumerating USB ports Tag: 51925
  - 16
    - 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: Enumerating USB ports Tag: 51917
  - 17
    - 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: Enumerating USB ports Tag: 51914
  - 18
    - 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: Enumerating USB ports Tag: 51911
  - 19
    - 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: Enumerating USB ports Tag: 51909
  - 20
    - 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: Enumerating USB ports Tag: 51908
  - 21
    - 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: Enumerating USB ports Tag: 51905
  - 22
    - 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: Enumerating USB ports Tag: 51904
  - 23
    - 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: Enumerating USB ports Tag: 51901
  - 24
    - 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: Enumerating USB ports Tag: 51900
  - 25
    - 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: Enumerating USB ports Tag: 51898
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  - 1
    - 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: Enumerating USB ports Tag: 51891
  - 2
    - 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: Enumerating USB ports Tag: 51889
  - 3
    - 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: Enumerating USB ports Tag: 51888
  - 4
    - 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: Enumerating USB ports Tag: 51887
  - 5
    - 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: Enumerating USB ports Tag: 51886
  - 6
    - 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: Enumerating USB ports Tag: 51883
  - 7
    - 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: Enumerating USB ports Tag: 51874
  - 8
    - 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: Enumerating USB ports Tag: 51868
  - 9
    - 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: Enumerating USB ports Tag: 51866
  - 10
    - 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: Enumerating USB ports Tag: 51864
  - 11
    - Accessing the SMBus through a Via 82C686 I am trying to talk to a device in an embedded PC that is on the SMBus. The SMBus controller is a VT82C686. I have never done driver development in Windows before so I'm a bit unsure of how to proceed. I've read the relevant sections in the Windows DDK and the questions and answers on usenet. The DDK example appears to be for writing a driver for a SMBus controller, rather than talking to an existing third-party driver. As the Microsoft-written drivers won't work with the Via chipset, I'm assuming the information I need will be from Via rather than MS. The DDK confused me. Can I just write a user-space application to talk to the SMBus controller, and have that pass on information? Does anybody know where information on using the Via driver is? Many thanks for any help. Stephen. Tag: Enumerating USB ports Tag: 51859
  - 12
    - Read a file currently beeing used by a driver Hi In my driver, I do log some data in af file on the harddrive. It would be nice to read the file with notepad, will the driver still is running and using the file. I do have some problems doing this. This is what I would like to do: Read the file in eg. Notepad, while the driver stilling using the file If the file allready exits, the driver opens the file, and append anything new to it. This is how I open the file in the driver // Create the file status = ZwCreateFile( &hLogFile, SYNCHRONIZE, &objectAttributes, &IoStatus, 0, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_WRITE | FILE_SHARE_WRITE, FILE_OPEN_IF, FILE_SYNCHRONOUS_IO_NONALERT, NULL, 0 ); I guess the problem is in the way I create the file, but what ? Thomas Tag: Enumerating USB ports Tag: 51856
  - 13
    - USB Video Class, How to Make firmware I am developping USB Video Class compilant device. I am trying to make USB Video Class Descriptors as USB Device Firmware such as Device Descriptor or vc interface descriptor. My device do not works at all. I writed USB Video Class Descriptors by reference to [ USB Device Class Definition for Video Devices Video Device Examples ] . please tel me Descriptors examples. Tag: Enumerating USB ports Tag: 51853
  - 14
    - usbhub.sys lower filter driver I have a usbhub.sys lower filter driver where I would like to filter URBs and make changes to them.when I recieve a URB,I want to send my own request down and on it's return change the URB and send it back.any hints on how I go about doing this would be welcome Tag: Enumerating USB ports Tag: 51851
  - 15
    - Build Environment hello, anybody who knows where to find about the buidling environment for creating printer drivers for : 1. Windows 9x/Me 2. Windows NT4 3. Windows 2000/XP thanks in advance. Tag: Enumerating USB ports Tag: 51848
  - 16
    - /NOLOWMEM does not work I want to test handling of physical addresses above 4 GB in my kernel driver. The test system: 8 GB RAM Windows 2000 Advanced Server with all patches installed. The boot.ini entry: /PAE /3GB /NOLOWMEM /NUMCPUS=1 It seems that /NOLOWMEM flag doesn't work -- Task Manager and WinDbg !vm command still show about 8000 MB of RAM. /NOLOWMEM should be compatible with /3GB according to http://www.microsoft.com/whdc/system/platform/server/PAE/PAEdrv.mspx "The /PAE, /NOLOWMEM and /3GB switches, and the registry change, can be used at once. Note that /3GB will prevent access to physical memory beyond 16 GB because the kernel memory space is reduced with the /3GB switch, and thus does not have enough room for the additional Page Table Entries required when memory is larger than 16 GB." What can be wrong with my setup? Dmitriy Budko, VMware Tag: Enumerating USB ports Tag: 51846
  - 17
    - Windows XP SP2 Printer Driver problem... A printer driver that was written and compiled using NTDDK was working fine for Windows 2000/XP. After installing XP SP2 the printer driver now causes a memory access violation in explorer.exe when selecting 'Printer Preferences' from the printer driver's property page about 4 out of 5 times. After re-compiling the driver with the current SDK (WINDDK\3790) it still has the same problem but only 1 in about 10 times does the access violation occur. Any help is appreciated. Thanks. Tag: Enumerating USB ports Tag: 51843
  - 18
    - Missing packet over HID USB stack Hi, I have a custom kernel mode function driver for a HID USB device. In Win2000 (SP4) I see a strange problem: after first time installation, the driver fails to read the first report (of 63 bytes data + 1 byte report id). I use a separate thread in which IRP_MJ_READ requests are issued to the HIDClass driver. It is seen that the requests block until some data is obtained, which is quite fine. But it fails to return the very first packet. All remaining packets are retrived properly. I am sure that the first packet is properly transmitted across the bus from data from USB tracer log. Notably, this behavior happens only during the first use of the device after fresh installation of the driver. Issue does not happen if the device is re-plugged and used again. Also this issue is not seen on the same driver when used in XP. Does anyone have clue what is going wrong in my Win2000 environment? Thanks in advance. Najas Tag: Enumerating USB ports Tag: 51838
  - 19
    - NO_MORE_IRP_STACK_LOCATIONS When Calling IoCallDriver(). Hi, I am writing a dynamically loaded upper filter driver for a serial port. My driver loads succesfully and I then send it a special "start" IOCTL containing the name of the serial port device it is to open (i.e. "\??\COM4"). This is the code for my IOCTL (with error checking removed for clarity). This has been cribbed from a variety of sources including Walt Oney's book. ---------- 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; switch(code) { case MY_IOCTL: // 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); // Use the Unicode string to get a pointer to the current device for (ie) COM4. PFILE_OBJECT FileObject = NULL; PDEVICE_OBJECT DeviceObject = NULL; status=IoGetDeviceObjectPointer(&PortName, FILE_READ_DATA, &FileObject, &DeviceObject); pdx->Pdo = DeviceObject; pdx->LowerDeviceObject = IoAttachDeviceToDeviceStack(fdo,DeviceObject); PIO_STACK_LOCATION pIrpStack = IoGetNextIrpStackLocation(Irp); ObDereferenceObject(FileObject); pIrpStack->MajorFunction = IRP_MJ_CREATE; /////// Bug Check when next line executed. status = IoCallDriver(pdx->LowerDeviceObject,Irp); Any help would be greatly appreciated. Thanks O.C. Tag: Enumerating USB ports Tag: 51822
  - 20
    - Printer Driver upgrade Hi, When we upgrade a Microsoft Unidriver based Printer driver with the render and/or UI Plug-in dlls currently loaded by Explorer, the spooler uses the some algorithm wherein it replaces the files in the 3 directory(C:\WINNT\system32\spool\drivers\w32x86\3) with the new version and then copies the current version(currently loaded by exlporer) into the 'C:\WINNT\system32\spool\drivers\w32x86\3\Old' directory. I have observed the same behavior with Monolithic printer drivers too wherein the render and/or UI dlls even if currently loaded by Explorer or any other App(Print dialog -> Properties) are replaced/upgraded in the 3 directory and the current version is copied into the 3\old directory. Now this is something that doesn't happen for other driver dependent files in the 3 directory. One thing that really puzzles me is the fact that the Process Explorer tool shows the UI/Render dlls loaded from 3 directory after upgrade but Iam unable to delete the dlls in the 3\old directory as well, which says 'access denied'. Iam not sure who's keeping the files loaded from 3\old directory? Any clue as to whats happening here would be of great help to me. Is this something being done by spooler, as a special case processing? Thanks & Regards, Harsha. Tag: Enumerating USB ports Tag: 51821
  - 21
    - Software only driver I am old in C/C++ programming but VERY new in drivers programming. I will need a bit of guidance, as my only book on the subject WDM - Walter Oney I've read did not helped. I want to build a "software only" driver that simulates an hard disk drive (virtual disk) that will keep in a file all its data. I want this to work on 98, 2000, XP and 2003. For the moment the target is only XP. 1. Do I need WDM or not? What are the sides to these two choices? 2. Do I need PnP and/or Power Management? What if I do not implement these for a "software only driver". 3. What is a legacy driver of type: "Kernel Mode Service"? Should I use this? Thanks and I will highly appreciate any answer or piece of information I can get from you. TIA Tag: Enumerating USB ports Tag: 51820
  - 22
    - Multiple instances Hi all, i developed a serial virtual port wdm driver. Now i'd like to have more than one instance of that port but when i install the second instance i have a generic error (it is not possible to load the driver). If i open my custom properties sheet for the second instance, i have the parameter coming from the first instance .... but i think this is a consequence of the starting error. How about the DLL and sys files ? They should be common for every instance ... is there a reference counter? If i update the driver, then it will be update for every instance of the port ? thanks a lot -- Stefano M Tag: Enumerating USB ports Tag: 51819
  - 23
    - PNP_LOCATION_INTERFACE? I'm writing a bus driver that reports a virtual NIC. I recently made changes to my NDIS miniport driver to enable DMA (call to NdisMInitializeScatterGatherDma). When I launch the HCT (11.2), this results in a bus interface query to the bus driver for a PNP_LOCATION_INTERFACE. I have implemented what I think the interface is supposed to do, but have failed to find any documentation. Without this interface implemented, returning STATUS_NOT_SUPPORTED would result in the non-existant returned interface to be invoked, resulting in a BSOD with the following stack trace: STACK_TEXT: WARNING: Frame IP not in any known module. Following frames may be wrong. f3aa5c88 80649102 00000001 f3aa5ce8 e1b841a0 0xe103b80e f3aa5cf0 8064bcec 00000000 f3aa5d1c 00000014 nt!PpCriticalGetDeviceLocationStrings+0x112 f3aa5d28 805c9284 0000000a e1b841a0 00000014 nt!PiControlGetPropertyData+0x1fc f3aa5d50 804dfd24 e1b841a0 0070f8e8 00000014 nt!NtPlugPlayControl+0xa8 f3aa5d50 7ffe0304 e1b841a0 0070f8e8 00000014 nt!KiSystemService+0xd0 0070f8c4 77f42c2b 75773475 0000000a 0070f8e8 SharedUserData!SystemCallStub+0x4 0070f8c8 75773475 0000000a 0070f8e8 00000014 ntdll!NtPlugPlayControl+0xc 0070f938 77c57920 000cc920 000bf9a4 00000024 umpnpmgr!PNP_GetDeviceRegProp+0x22a 0070f96c 77ce61d0 757718e7 0070fb2c 00000008 RPCRT4!Invoke+0x30 0070fd48 77ce63a7 00000000 00000000 000cc994 RPCRT4!NdrStubCall2+0x229 0070fd64 77c57337 000cc994 000b8cf0 000cc994 RPCRT4!NdrServerCall2+0x17 0070fd98 77c571f9 7577130e 000cc994 0070fe38 RPCRT4!DispatchToStubInCNoAvrf+0x38 0070fdec 77c572b9 0000000d 00000000 7578c018 RPCRT4!RPC_INTERFACE::DispatchToStubWorker+0x112 0070fe10 77c88646 000cc994 00000000 7578c018 RPCRT4!RPC_INTERFACE::DispatchToStub+0xa1 0070fe44 77c8874e 000cc958 000bf998 000cc920 RPCRT4!OSF_SCALL::DispatchHelper+0x144 0070fe58 77c884f1 00000000 000c000d 00000001 RPCRT4!OSF_SCALL::DispatchRPCCall+0xfc 0070fe90 77c884dd 000bf980 03000070 00000000 RPCRT4!OSF_SCALL::ProcessReceivedPDU+0x5df 0070feb0 77c884c7 000bf980 00000070 77e419a7 RPCRT4!OSF_SCALL::BeginRpcCall+0x21e 0070ff10 77c81050 00000000 000bf980 00000070 RPCRT4!OSF_SCONNECTION::ProcessReceiveComplete+0x473 0070ff20 77c80b0e 0009a220 0000000c 00000000 RPCRT4!ProcessConnectionServerReceivedEvent+0x20 0070ff8c 77c58159 77c60771 0009a220 00000000 RPCRT4!LOADABLE_TRANSPORT::ProcessIOEvents+0x1b6 0070ff90 77c60771 0009a220 00000000 00000000 RPCRT4!ProcessIOEventsWrapper+0x9 0070ffb0 77c60857 00099af0 77e4a990 0009fc68 RPCRT4!BaseCachedThreadRoutine+0x9c 0070ffb8 77e4a990 0009fc68 00000000 00000000 RPCRT4!ThreadStartRoutine+0x17 0070ffec 00000000 77c60840 0009fc68 00000000 kernel32!BaseThreadStart+0x34 With this interface implemented, the HCT can now launch. I would like to make sure that the my implementation for the interface is doing the right thing. Can anyone point me to documentation for what this interface is supposed to do, and how it is supposed to behave? Thanks Tag: Enumerating USB ports Tag: 51801
  - 24
    - USB 2.0 on Win9x/ME/NT Hello, I have made a bulkOUT interrupt IN usb driver based on bulkusb.sys code in Win XPDDK and some help here and there from Walter Oney's book. My device is a High Speed USB 2.0 device working only on high speed. Now i want to make this driver work on Win 95/98/ME/NT . The problem is that there is no support for USB 2.0 in the Microsoft provided USB stack on these OSes. What is the best recommended way to develop a client driver for these OS as well , ideally to utilise the driver already built that works fine for 2k/XP. Are there any 3rd party USB stacks available that can be used in development and provide a similar API interface provided by Microsoft USB stack on 2k/XP. specifically i just build URBs and pass them over to usbd.sys which talks to usbhub.sys and usbehci.sys by itself . With minimum possible extra development time , and utilising the maximum part of existing driver code we already have , what is the best practise here? regards Taha Tag: Enumerating USB ports Tag: 51794
  - 25
    - Hibernation fails if the scsiminiport DeviceExtensionSize > 32k Hi, I'm writing scsiminiport driver, when installing Windows XP SP1 over my device, hibernation fails. In the DDK it is written that a device driver must allocate less than 32k of uncached memory in order to participate in hibernation, my driver allocates 12k of uncached memory (using ScsiPortGetUncachedExtension() ). when I followed (assembly code) of windows I found that it fails to hibernate when comparing the deviceExtensionSize(43k in my case) against 32k. The DDK doesn't mention any restrections regarding deviceExtentionSize. I didn't find Knowledge Base article regarding this issue. The work around I'm thinking of is to allocate memory "externally" using ExAllocatePoolWithTag in the FindAdapter function and to free it when stopping the device in AdapterControl function. Is there any body faced this issue? Is there any harm in the work around? thanks saeed Tag: Enumerating USB ports Tag: 51779

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,

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