floating point math

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  - 1
    - Disappearing Symbolic link and device Objects I have driver pair X and Y. Both are installed as a Demand Start sevices by a console app. Upon load, Driver X creates a link \\??\\Driver_X for user mode access and loads driver Y (using ZwLoadDriver). The symbolic link creted by drive X ( \\??\\Driver_X ) mysteriously disappears if I unload driver Y using the console app ( it calls service control manager StopService). The user mode apps fails to open X, obviously becuase it couldnt see the link. I verified the disappearence of the link with the sysinternals winobj. But I see the existance of the link with Osr's objdir!!! Is there any explnation why this happens? I am sure that neither the Device object nor symbolic link created by Driver X are explicitly deleted by Driver X( X never calls IoDeleteDevice or IoDeleteSymbolicLink in this case). This doesnt happen if I load X ( which in trun loads Y). Reboot the machine then try unload X using the same console app. I am running Windows 2000. This happens in only one machine, another 20 or so machines ok. -Sen Thanks, Sen Tag: floating point math Tag: 45844
  - 2
    - video mirror driver Hi, I need to modify the mirror driver to get a simple information: whatever is the application that modify the desktop i need to know what is the region that Windows draw and/or update (RECT). I'm sure that this information is in the struct SURFOBJ of DrvBitBlt and DrvCopyBits so hooking this call I can grab such information. The question is: how can I send this information to UserMode Application? Can I use a IOCTL or a ReadFile ? Thanks, Pierluigi M. Tag: floating point math Tag: 45838
  - 3
    - slim difference ? In IoCreateFile what is the difference between disposition values of FILE_SUPERSEDE & FILE_OVERWRITE_IF Tag: floating point math Tag: 45827
  - 4
    - sources/Build.exe alternate source file location question Is it possible to specify a source file that is in a different folder than the current one or the parent folder? It seems that when I specifiy "SOURCES=foo.c", Build.exe looks in the directory above and then the current directory. I would like to be able to specify "SOURCES=..\AltDirectory\foo.c" , but Build.exe whines and complains when I do. Any ideas? Thanks, John Tag: floating point math Tag: 45806
  - 5
    - AVStream: Using InterlockedAnd(), InterlockedOr(), InterlockedXOR() LONG InterlockedAnd ( IN OUT LONG volatile *Destination, IN LONG Value ); I'm using ... LONG volatile dest; LONG value, retval; retval = InterlockedAnd (&dest, value); ... Compiler: error C3861: 'InterlockedAnd': identifier not found, even with argument-dependent lookup error C3861: 'identifier': identifier not found, even with argument-dependent lookup The compiler was not able to resolve a reference to an identifier, even using argument-dependent lookup. Any ideas? Tag: floating point math Tag: 45800
  - 6
    - KeQueryPerformanceCounter problems In this code LARGE_INTEGER liTickCount; LARGE_INTEGER liFrequency ; liTickCount = KeQueryPerformanceCounter( &liFrequency ); I get a crash as soon as I try to access liFrequence Any ideas ? TIA Lars Tag: floating point math Tag: 45799
  - 7
    - CMI8738/PCI Device Driver Hi, I don't know my audio driver for my computer here it is a pentium 3 1000 mhz but when I open the box I find this information on something inside. E3DX HSP56 CMI8738/PCI HRTF Audio com Does anyone have an idea what his means and how I can figure out what my driver is and where I can get it from. Thanks in Advance, Logan Tag: floating point math Tag: 45792
  - 8
    - DrvDevicePropertySheets Hello Does someone have a SIMPLE example of a printer drivers DrvDevicePropertySheets function? I tryed to figure out what it has to do with the plotui sample of the DDK... but this sample is far away from being simple. There are thousands of modules linked together and even more functions called (it's impossible to follow the way the program takes)... but what I want is only to show a simple property sheet... with nothing on it... or just one option... but not all the stuff they have in this plotui sample. I hope someone can help me. thanks MR Tag: floating point math Tag: 45786
  - 9
    - GetTickCount in Kernel mode Hi What is the equivalent for GetTickCount or QueryPerformanceTimer in a kernel mode driver ? TIA Lars Tag: floating point math Tag: 45780
  - 10
    - ReadFile problem I'm writing a printer driver and I need to ask the printer for its status. I sent a command to the printer through WriteFile and it worked fine (using serial communication). When I try to read from the printer with ReadFile it crashes. I have a printf after the ReadFile command and it never displays it. Any suggestions Harry Tag: floating point math Tag: 45776
  - 11
    - Pending IRP A driver can't have more then 1 IRP pending from a specific file handle? For example, if I have a read IRP pending, I won't receive a IOCTL IRP (on the same handle). The requests are sent from a win32 application. Tag: floating point math Tag: 45775
  - 12
    - how to convert a dotted-decimal IP address into host internal IP address Hi,All, It is very convenient to use a dotted-decimal ip address,however,TDISendDataGram requires a ULong-typed IP address. Hence a convension is necessary.Is there any function in windows kernel mode which can assume this duty? Tag: floating point math Tag: 45770
  - 13
    - Urgent : Reloading settings for NDIS driver Hello Now, I'm getting desperate. I need to reload the settings for the NDIS driver on Windows 2000 / XP. I use it for using the USB as a NIC and I have to setup the IP address from a service. Unfortunately, these settings are only read when starting the NDIS driver and I need a way to reload these settings/loading the NDIS driver on Window 2000 / XP other than pulling the cable out and reinserting it. I got it working on Windows CE. Please help me. Henrik Tag: floating point math Tag: 45769
  - 14
    - Interdriver communication page fault hi, i am a novice at drivers and need some help .. some days back i posted a query regarding mechanisms for interdriver communication among drivers not on the same stack. One of the mechanisms told was to build an IRP using IoBuildDeviceIoControlRequest() and send using the IoCallDriver() method. I allocated the buffers and built an IRP using the IRP_MJ_INTERNAL_DEVICE_CONTROL ioctl and sent it via IoCallDriver. I did it in the Passthru IM driver's MPSend() function. The idea is to route the incomming and outgoing packets' data to the TargetDriver for processing. I put the breakpoint on the SourceDriver's function in SoftICe. Now this scheme works fine once or twice when the function is called but after that there is a PAGE FAULT and everyting crashes. I thought i could get some advice on this forum regarding this. Can anybody help me with any suggestions regarding what i may be doing wrong ??? when i see the stack in the SOftIce the top most function in the stack is IoBuildDeviceIoControlRequest() .... ?? i am posting the code for the source driver(passthru)'s function and the corresponding handler in the target driver below int SourceDriver::ProcessPacket( ... KeInitializeEvent(&TargetWriteEvent, NotificationEvent, FALSE) SysInBuffer = ExAllocatePool(NonPagedPool, inparamsize) SysOutBuffer = ExAllocatePool(NonPagedPool, outparamsize) .... TargetWriteIrp = IoBuildDeviceIoControlRequest(IOCTL_Target_Process_DUMMY Target_DeviceObject SysInBuffer inparamsize SysOutBuffer outparamsize TRUE &TargetWriteEvent My_Status_Bloc ) ntStatus = IoCallDriver(Target_DeviceObject, TargetWriteIrp) if(ntStatus == STATUS_PENDING ntStatus = KeWaitForSingleObjec &TargetWriteEvent, Executive, KernelMode, FALSE, NUL ) if (ntStatus == STATUS_TIMEOUT) DbgPrint("\nCanceling IRP to Target\n") IoCancelIrp(TargetWriteIrp) KeWaitForSingleObject(&TargetWriteEvent, Executive, KernelMode, FALSE, NULL) els ntStatus = TargetWriteIrp->IoStatus.Status; ..... //copy data from output buffer passed to ir ExFreePool(SysInBuffer) ExFreePool(SysOutBuffer) return 0 ///////////////////////////////////////////////////////////////////////////////////// NTSTATUS Target_Process_InternalIOCTL(IN PDEVICE_OBJECT fdo, IN PIRP Irp ..... switch(Control_Code .. case IOCTL_Target_Process_DUMMY KdPrin ( "%s%s", "Target_Process_InternalIOCTL: ", "case IOCTL_Target_Process_DUMMY\n )) DataLen = ((PULONG)Irp->AssociatedIrp.SystemBuffer)[1] ((PULONG)Irp->AssociatedIrp.SystemBuffer)[0] = 0; //Declare the result as success for(i=0; i< DataLen; i++ ((PULONG)Irp->AssociatedIrp.SystemBuffer)[5+i] = ((PULONG)Irp->AssociatedIrp.SystemBuffer)[7+i] ntStatus = STATUS_SUCCESS info = Irp->IoStatus.Information break ... return CompleteRequest(Irp, ntStatus, info) i thank you all in advace tojo Tag: floating point math Tag: 45766
  - 15
    - Unidriver Plug-in Hi I have added a tab in document properties by Unidriver plug-in and in that tab I have got 2 list boxes for font substitution I have hidden fontsustitution controls from standard Advance dialog by setting flag OPTIF_HIDE To populate list boxes on my tab I have done it from OptItems. My listboxes are getting populated correctly and are retriving settengs correctly depending upon the (pOptItems + index)->Se But my problems is when I set it does not save the value I change the pOptitems + index->Sel , Modify the flags with OPTIF_CHANGED and then call DrvUpdateUISetting() for that optItem This method works fine with all other features like copies, orienation, Tray etc but not only for fontsbustitution tabe . Is there any thing special with font sustitution table Thanks Naveen Tag: floating point math Tag: 45764
  - 16
    - how to build communication between TSR and driver? I want to transfer some data which residents in tsr to driver. The driver is set to "system bus extender" group, and the data residents in conventional memory(it is usually at 9C80:0-9c80:400), and it works well in 2k, but failed in nt4.0. Does anyone know the reason on it Best regards Polo Tag: floating point math Tag: 45756
  - 17
    - How to hook Mute, Volume Up, and Volume Down key under win98? Hi,All, I'm try to hook the MultiMedia key, under win2k or up, I use keyboard hook WH_KEYBOARD_LL should be Okay. But under win98 and winme, the WH_KEYBOARD_LL doesn't support, I can only use WH_KEYBOARD, it does not work. I could not hook any MultiMedia key (Such as Mute, Volume Up, and Volume Down), and use Spy++, nothing could be catched. Does anyone who knows about this. Needs help. -- Thanks & Regards Daniel -- __?__ / \ / ^ ^ \ ( (o) (o) ) \ / *=oOOO======(_)=====OOOo====*=====================================* | | SHANGHAI CELLINK CO, LTD. | | Daniel Xu | danielxu22@cellink.com.cn | *=============Oooo.=========*=====================================* .oooO ( ) ( ) ) / \ ( (_/ \_) Tag: floating point math Tag: 45755
  - 18
    - preventing inside IFSFN_READ...Win98 ...Vxd Hi, I am allowing inside IFSFN_OPEN. but I want to deny file operation inside IFSFN_READ.Is it possible to set error condition in Iorequ structure and return file deny from inside IFSFN_READ? Plz help me out I am writing file system filter driver. regds vinay Tag: floating point math Tag: 45746
  - 19
    - Buffered or Direct I am writing a driver that will need to receive a pointer to a physical address to be used for DMA from another device (not the one controlled by my driver). I have control over the interface between the two devices. I wish to pass a small structure to the "other" device in the output buffer of an IOCTL call. One fo the fields in this structure will be used to pass a physical address. My first assumption is that physical (or "logical") addresses are safe to pass from one device to another. Should I pass the aforementioned structure to the second device using direct or bufferd IO? Performance is my main objective, since the actual data transfer between the devices will be relatively small will the buffered technique actually be more efficient Brian Tag: floating point math Tag: 45743
  - 20
    - Miniport question Ok, I have question ... when do miniport drivers get unloaded by the system and what is the mechanism for doing that? Also, how does a video miniport differ from the more general miniports? What I'm seeing is ... that the video miniport never exits. When I remove the device the miniport is still active, when I insert the device another instance of the miniport (i think) is getting loaded. How do I cause the video miniport to exit? Brian Tag: floating point math Tag: 45742
  - 21
    - AVStream: DMA & Process() QUEUEing Hi All, Testing out a capture driver and get a Process() call, start DMA operation, then return from Process(). I get called with subsequent Process() calls prior to my DMA completion. Is it common to have a QUEUEing mechanism in the AVStream driver? Tag: floating point math Tag: 45738
  - 22
    - W2K equivalent functionality question ioenumeratedeviceobjectlist only appears in XP and beyond. What is the best way to implement this functionality in W2K ? Tag: floating point math Tag: 45734
  - 23
    - filter above serial waits for special char hello everyone, have installed an upper filter above serial and want to let it listen fo= r = a special character. this char will be send from a device to the com-port, where my filter is= = attached on. in detail: from an usermode app. a deviceIoControl - request is send to my filter.= the dispatch-routine for this ioctl-request sends a char to the com-port= = via self-made irp (IoBuildAsynchronousFsdRequest, IoSetCompletionRoutine= , = IoCallDriver)... that works fine so far. but, after that i need to listen for an answer from the connected device= , = which is a special character. after this char is identified, a next writ= e = with some buffer content has to start immediately. my first idea was to set up a workerthread right after the write, which = = sends a synchronous read request down to serial and waits. then, the = thread validates the content of the readbuffer and initiates the next = write-op. my question is, is this a realistic method? (this is my first experience= = in driver programming) and, can such a construction react fast enough, that the delay btw. = incoming answer and next write is physicaly below 6 ms ? thanks for your answers Tag: floating point math Tag: 45732
  - 24
    - Writing an USB Driver I am looking for a template of a generic USB device driver Have you any Wher can I find it Best regards Tag: floating point math Tag: 45727
  - 25
    - VfW capture driver DLL doubts Hi, I am writing a VfW capture driver DLL(user-mode). But I am facing some problems in giving the data back to the client from the driver. I am using client as WME. I have followed the steps given in the NT4.0 DDK also the sample. The driver loading, opening, closing, adding buffer's are happening properly. The client is adding a new buffer after filling and giving old buffer(which it has given before) back to the client by doing a callback from the DLL. I am setting the dwFlag header as lpVideoHdr->dwFlags |= VHDR_DONE; Actually the driver should convert the H.261 data to uncompressed video samples. But in order to ensure that driver is giving data properly to the client, I want to give some static image. I am filling the lpData member like the following. memset(lpVideoHdr->lpData, (UCHAR)255, lpVideoHdr->dwBufferLength); lpVideoHdr->dwBytesUsed = lpVideoHdr->dwBufferLength; And by using DriverCallback function I am giving the buffer to client. But client is displaying the data as "black" always. When I click encoding it is creating a new file but without any data. I am very much new to video programming. I am doing something wrong. Please anybody can advice/help to correct me. I have only done audio related applications which all are standard exe's. Also is there anyway, I can use DirectX / VCM functions to convert H.261 video data to RGB/YUV format? or Do I have to go for some open source code? It would really help me if anybody can advice or give me some hints for the above. Thanks, Sreeram. Tag: floating point math Tag: 45721
- Next
  - 1
    - Problem with Microsoft Bluetooth and socket accept Hi all I have successfully developed an application with the MS API. Now I want to develop a server app so I´ve basically used a complete test project found at http://www.lenholgate.com/archives/000206.html. My problem is that the application hangs on accept. I try to connect to the server from an authenticated device (Sony Ericsson Phone) and the Phone finds the computer but no services (there should be an obex service) and it is not possible to connect. I have tried both the MS and TDK dongles and both work fine from within Windows and with socket connect but not with this accept approach. Code segment: SOCKADDR_BTH address; address.addressFamily = AF_BTH; address.btAddr = 0; address.serviceClassId = GUID_NULL; address.port = BT_PORT_ANY; sockaddr *pAddr = (sockaddr*)&address; if (0 != bind(s, pAddr, sizeof(SOCKADDR_BTH))) { printf("%s\n", GetLastErrorMessage(GetLastError())); } int size = sizeof(SOCKADDR_BTH); if (0 != getsockname(s, pAddr, &size)) { printf("%s\n", GetLastErrorMessage(GetLastError())); } if (0 != listen(s, 10)) { printf("%s\n", GetLastErrorMessage(GetLastError())); } WSAQUERYSET service; memset(&service, 0, sizeof(service)); service.dwSize = sizeof(service); service.lpszServiceInstanceName = "My Service"; service.lpszComment = "My comment"; GUID serviceID = OBEXFileTransferServiceClass_UUID; service.lpServiceClassId = &serviceID; service.dwNumberOfCsAddrs = 1; service.dwNameSpace = NS_BTH; CSADDR_INFO csAddr; memset(&csAddr, 0, sizeof(csAddr)); csAddr.LocalAddr.iSockaddrLength = sizeof(SOCKADDR_BTH); csAddr.LocalAddr.lpSockaddr = pAddr; csAddr.iSocketType = SOCK_STREAM; csAddr.iProtocol = BTHPROTO_RFCOMM; service.lpcsaBuffer = &csAddr; if (0 != WSASetService(&service, RNRSERVICE_REGISTER, 0)) { printf("%s\n", GetLastErrorMessage(GetLastError())); } SOCKET s1 = accept(s, 0, 0); //I´m stuck here unsigned char buffer[2000]; memset(buffer, 0, sizeof(buffer)); int r = recv(s1,(char*)buffer, sizeof(buffer), 0); printf("%s\n", DumpData(buffer, r, 40).c_str()); HandlePacket(s1, r, buffer); memset(buffer, 0, sizeof(buffer)); r = recv(s1,(char*)buffer, sizeof(buffer), 0); printf("%s\n", DumpData(buffer, r, 40).c_str()); closesocket(s1); if (0 != WSASetService(&service, RNRSERVICE_DELETE, 0)) { printf("%s\n", GetLastErrorMessage(GetLastError())); } closesocket(s); WSACleanup(); } Tag: floating point math Tag: 45720
  - 2
    - Help:one question about USB verifier Dear all My driver is the driver of USB device.In my driver, I built one IRP and send it to the device.When I did the USB Manual Interoperability test(the test showed that it was installing the usb verifier), I can not send the IRP to device.But when I did not the test ,I could send the IRP . My code is irp = IoBuildAsynchronousFsdRequest READER_EXTENSION(UsbIoControlCode),//IRP_MJ_WRITE NextStackDevice requestBuffer requestBufferLength,//sizeof(requestBuffer &startingOffset &ioStatu ) Why is it? Tag: floating point math Tag: 45715
  - 3
    - The Smallest video stream driver Hi Sorry for ask this question^^""" Is there any smallest video stream driver sample code that show me how to write a video stream driver ?? my device just use dma to transmit video data only The ddk for me is too much and too less info ^^""" Just give me a start Thanks a lot Tag: floating point math Tag: 45714
  - 4
    - Common Buffer based Bus Master DMA. Hi I am working on a WMD driver for a device that supports BUS master DMA but not scatter gather. I am trying to use a common buffer for DMA transfer. I am using a buffer of about 250 Kbyte, and never seem to have problems allocating it. I'm a bit concerned about map registers. The DDK docs say: "The requested size for the buffer, shown in Figure 3.12 as LengthForBuffer, determines how many map registers must be used to provide a virtual-to-logical mapping for the common buffer. At most, the number of map registers can be the value of (BYTES_TO_PAGES (LengthForBuffer)). This value cannot be greater than the NumberOfMapRegisters returned by IoGetDmaAdapter. For more information about system-supplied macros, such as BYTES_TO_PAGES, that drivers can use, see the Kernel-Mode Driver Reference." On my machine IoGetDmaAdapter returns 2. Does this mean that I can only transfer up to 2 pages of memory at one go (ie 2*4K on my machine). Unfortunately neither the DDK or the Walter Oney book seem to cover this topic well. At the moment I just ignore the number of map registers and assume it will be OK. Half way through the PCI board transferring data from its self to the PCI address returned by AllocateCommonBuffer it bug checks. Is this likely to be because it ran out of MapRegisters? If so how can I go about transferring larger amounts of data under the control of the PCI card (or the DSP on it). I currently have a synchronisation scheme between the PC and the DSP using PIO (which sets up and controls the DMA) and I do not want to have to change this (ie I don't want to use Packet based transfer). If it comes to It I would rather send multiple buffer locations to the DSP using PIO and program the DSP to do a "scatter gather type operation". Thanks Tag: floating point math Tag: 45712
  - 5
    - can WSPSocket be used in windows Kernel mode? can or not? How? thank you. Tag: floating point math Tag: 45710
  - 6
    - NDIS Library Version Hello Everybody, In Passthru.h (2003) see the foll defines /////// // // Used in NdisIMRegisterLayeredMiniport // #ifdef NDIS51_MINIPORT #define PASSTHRU_MAJOR_NDIS_VERSION 5 #define PASSTHRU_MINOR_NDIS_VERSION 1 #else #define PASSTHRU_MAJOR_NDIS_VERSION 4 #define PASSTHRU_MINOR_NDIS_VERSION 0 #endif // // Used in NdisRegisterProtocol // #ifdef NDIS51 #define PASSTHRU_PROT_MAJOR_NDIS_VERSION 5 #define PASSTHRU_PROT_MINOR_NDIS_VERSION 0 #else #define PASSTHRU_PROT_MAJOR_NDIS_VERSION 4 #define PASSTHRU_PROT_MINOR_NDIS_VERSION 0 #endif /////// The "defines" specify the NDIS library version the driver will use. Am I right here? If I am right, then, if I build the driver for XP (NDIS 5.1), then 1. The miniport part of the driver will use NDIS 5.1 2. The protocol part of the driver will use NDIS 5.0 Why so ? Why must miniport (virutual miniport) and protocol use different library versions ? Shouldn't they use the same NDIS library (5.1) ? Thanks Abhijit Tag: floating point math Tag: 45707
  - 7
    - modem.sys and device path exerciser We've got a problem with our modem stack running under device path exerciser from HCT suite, under XP. Occasionally, IRPs get stuck in MODEM.SYS queue. Those IRPs are originated from DeviceIoControl, code 0x002B0018, which is some private MODEM.SYS IOCTL. Modem.sys converts those to IRP_MJ_READ or IRP_MJ_WRITE and sends further to the lower driver. Our driver (acfva) is a filter which sits below modem.sys. Here is how the stuck IRP looks like: 0: kd> !irp 0x8257ae00 1 Irp is active with 11 stacks 11 is current (= 0x8257afd8) No Mdl System buffer = ff73b588 Thread 819ea020: Irp stack trace. Pending has been returned Flags = 40000070 ThreadListEntry.Flink = 83194e10 ThreadListEntry.Blink = 819ea230 IoStatus.Status = 00000000 IoStatus.Information = 00000032 RequestorMode = 00000001 Cancel = 01 CancelIrql = 0 ApcEnvironment = 00 UserIosb = 0102f2a8 UserEvent = 00000000 Overlay.AsynchronousParameters.UserApcRoutine = 00000000 Overlay.AsynchronousParameters.UserApcContext = 00000000 Overlay.AllocationSize = 00000000 - 00000000 CancelRoutine = 00000000 UserBuffer = fffffc00 &Tail.Overlay.DeviceQueueEntry = 8257ae40 Tail.Overlay.Thread = 819ea020 Tail.Overlay.AuxiliaryBuffer = 00000000 Tail.Overlay.ListEntry.Flink = 8257ae58 Tail.Overlay.ListEntry.Blink = 8257ae58 Tail.Overlay.CurrentStackLocation = 8257afd8 Tail.Overlay.OriginalFileObject = 81b8b9f8 Tail.Apc = 00000000 Tail.CompletionKey = 00000000 cmd flg cl Device File Completion-Context [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 0 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 0, 0] 0 10 00000000 00000000 00000000-00000000 Args: 00000000 00000000 00000000 00000000 [ 4, 0] 0 10 821df820 00000000 8063f6b8-8257afb4 \Driver\acfva nt!IovpInternalCompletionTrap Args: 00000000 00000000 00000000 00000000 [ 4, 0] 0 10 821027a8 00000000 f880f520-81ba20e8 \DRIVER\VERIFIER Modem!UniStopReceiveComplete Args: 00000000 00000000 00000000 00000000 >[ e, 0] 5 1 81ba2030 81b8b9f8 00000000-00000000 pending \Driver\Modem Args: 00000000 00000032 002b0018 00000000 The IRP is completed in our driver, but is still pending in modem.sys. The completion routine is UniStopReceiveComplete, which got called. On the disassembly, one can see that this completion routine has the great potential to screw things up: Modem!UniStopReceiveComplete: f880f520 8b442404 mov eax,[esp+0x4] f880f524 8b4028 mov eax,[eax+0x28] f880f527 50 push eax f880f528 ff74240c push dword ptr [esp+0xc] f880f52c 05f0010000 add eax,0x1f0 f880f531 50 push eax f880f532 ff15d0f880f8 call dword ptr [Modem!_imp__KeInsertQueueDpc (f880f8d0)] f880f538 b8160000c0 mov eax,0xc0000016 f880f53d c20c00 ret 0xc Which is equivalent to: NTSTATUS UniStopReceiveComplete(<standard args>) { KeInsertQueueDpc(&DeviceObject->DeviceExtension->CompletionDpc, Irp, DeviceObject->DeviceExtension); return STATUS_MORE_PROCESSING_REQUIRED; } For the code to work correctly, modem.sys has to make sure there is always only one IRP with that completion routine active. It means, such IRPs should be serialized before they go to the lower driver. I don't know if modem.sys actually serializes them, or it just (wrongly) assumes there won't be such a case. The device path exerciser may bombard modem.sys with series of similar IRPs (for example those with 2B0018 (?) IOCTL code). If two such IRPs are sent by the exerciser and completed before CompletionDpc has a chance to run, the first IRP is lost, and I believe this is why the IRP gets stuck. It is absolutely bad idea to queue a per-driver DPC with an IRP argument, without making sure those IRPs are serialized. The driver should queue those IRPs in some list instead (using Tail.Overlay.ListEntry), and the DPC should then handle the list. Tag: floating point math Tag: 45704
  - 8
    - AVStream : MPEG2 A/V synchronization issue Dear All I developed a MPEG2 encoder filter. It could work with MPEG-2 Demultiplexer, MPEG2 Video and Audio decoder, Video and Audio Renderer filters now. But I found that its audio and video are not synchronized. Could someone tell me how to solve this synchronization issue Thanks Edward Tag: floating point math Tag: 45702
  - 9
    - ISA Interface Card Dear DDK experts I'm working on a Device Driver for an ISA Interface Card because we are porting Device Control software from MSDOS to Windows 98 I have Visual C++ installed and the Windows 98 DDK (Driver Developer's Kit) plus the Microsoft Press text book "Programming the Microsoft Windows Driver Model" It is a home made ISA Interface Card so there are no commercial drivers available off the shelf. The Visual C++ 6 "Windows Driver Model Wizard" creates a skeleton project. Is there sample code for making ISA Interface Card Device Drivers that I could adapt for our purpose and a "step by step" text book since I am a novice with the DDK Stephen Tag: floating point math Tag: 45695
  - 10
    - Who set OVERLAPPED.HANDLE: I/O Manager or serial.sys When user-mode application uses asynchronous read/write it set OVERLAPPED.HANDLE to already opened event object After I/O completed thiis event is being set by I'm wondering if this event is being se before IoRequestComplete() or after ? I looked in DDK\....\serial but could't find the answer It looks that IO Manager need to set this event after receiving IoCompleteRequest Does somebody know Thanks, mik Tag: floating point math Tag: 45694
  - 11
    - IOCTL_ATA_PASS_THROUGH or IOCTL_ATA_PASS_THROUGH_DIRECT Has anyone been able to obtain sample code for the IOCTL_ATA_PASS_THROUGH or IOCTL_ATA_PASS_THROUGH_DIRECT commands? These were not present in the XP 2003 DDK except as defined in ntddscsi.h Any info or directed/related links greatly appreciated. Thanks in advance, aB Tag: floating point math Tag: 45693
  - 12
    - Question about delay constraint to exit an ISR at DIRQL. Subject : Question about delay constraint to exit an ISR at DIRQL. Dear all, I'm developing a device driver which needs semi-real time operation for Notebook PC. I want know how long my ISR can stay at DIRQL not DISPATCH_LEVEL. Is there any delay constraint to exit an ISR at DIRQL? Can my ISR affect not only system performance but also system reliability? I estimated that my ISR will take 100usec or more at 1GHz general notebook PC every 2msec. Thank you for your advice in advance. Have a nice week. //Daum Tag: floating point math Tag: 45686
  - 13
    - How can i force all the applications to use specific network interface? Hi All, I have two interface on my computer. I want specific applications to use one interface and rest to use another interface. I do not have any control over the applicaions. Can i write some driver/Module in the networking stack, which will help me force the applications to use the specified interface. second part of my question is, how does socket pick up the interface. If client do not bind the socket with any local address, how does socket pick up the local interface while using connect API, if i have more than one interface? Thanks a lot in advance. Regards Rajesh Tag: floating point math Tag: 45679
  - 14
    - im filter and ipsec I have an IM network driver that works dandy for most scenarios. When a Cisco IPSec VPN is installed, we have some issues - basically the PSched/DNE drivers pick off the traffic before we see them. On XP, I was able to install using the FilterClass of "Scheduler" in the inf file, and that installs us above the ipsec drivers. That has been working reasonably so far. But on 2K this doesn't work - no matter what I do, the DNE driver always gets installed above us and pick off (and encrypts) the traffic before we can look at it. Any suggestions? Thanks,, Warren Tag: floating point math Tag: 45678
  - 15
    - deferred driver updates I have three 1394 devices with same vendorId and model. So hardwareId is same and same device driver is used for all devices. When I connect more than one device and through device manager I update the 1394 driver. **The installation doesnot give any error**. Everything works fine but it was old driver and not new driver. But the new driver is updated only after reboot or if all the devices are removed and reconnected to PC. If I update the driver with only one device connected, new driver is updated immediately. What can I do to update the driver file even if more than one device is connected. (All devices use same INF file and same driver files). I manually updated all devices(enumerated in device manager and through properties-->driver update), but still old driver is used till I remove the cables or restart the PC. Thanks Tag: floating point math Tag: 45677
  - 16
    - Problems with BUILD Hi I'm a total novice as regards the DDK and might be overlooking something obvious I've got source for a driver from a hardware vendor that I am working with. When I run the Build utility on screen prompts indicate that everything is going well, but no obj and sys files are fomed The BUILD log file indicates that there are problems and I included it at the bottom of this message I've gotten the same results in on 3 different machines including one I just built. I'm using the Win2K DDK on Windows 2000 There are no problems building the samples included in the DDK Any help would be much appreciated Thank Randy Feingers ******************** CONTENTS OF LOG FIL Compiling c:\vista imaging\source\windows\vicam3.sys directory ******************* 'nmake.exe /c BUILDMSG=Stop. -i NTTEST= UMTEST= NOLINK=1 386=1 jvc /nologo /cp d:\NTDDK\public\sdk\classes\afc.zip;d:\NTDDK\public\sdk\classes\classes.zip;C:\VistaImaging\Source\Windows\Vicam3.sys; /g /w4 /d objchk\i386 'jvc' is not recognized as an internal or external command operable program or batch file jvc /nologo /cp d:\NTDDK\public\sdk\classes\afc.zip;d:\NTDDK\public\sdk\classes\classes.zip;C:\VistaImaging\Source\Windows\Vicam3.sys; /g /w4 /d objchk\i386 'jvc' is not recognized as an internal or external command operable program or batch file Linking c:\vista imaging\source\windows\vicam3.sys directory ******************* 'nmake.exe /c BUILDMSG=Stop. -i LINKONLY=1 NOPASS0=1 NTTEST= UMTEST= 386=1 jvc /nologo /cp d:\NTDDK\public\sdk\classes\afc.zip;d:\NTDDK\public\sdk\classes\classes.zip;C:\VistaImaging\Source\Windows\Vicam3.sys; /g /w4 /d objchk\i386 'jvc' is not recognized as an internal or external command operable program or batch file jvc /nologo /cp d:\NTDDK\public\sdk\classes\afc.zip;d:\NTDDK\public\sdk\classes\classes.zip;C:\VistaImaging\Source\Windows\Vicam3.sys; /g /w4 /d objchk\i386 'jvc' is not recognized as an internal or external command operable program or batch file. Tag: floating point math Tag: 45669
  - 17
    - DevCon utility code in the DDK Hi all, I have DDK but without this example (probably old DDK). Where can I get this example ? Is it possible to download a new DDK ? Thanks Maurice Tag: floating point math Tag: 45667
  - 18
    - User Vs Kernel mode -mouse like - SendInput/CreateFile("COM1",...) Hi all, I have to do a device driver for a TouchScreen monitor and it is supposed to work like a mouse. Now I'm studing how to do WDM driver (kernel-mode, right?)....But during my job of understand the firmware protocol I did an application that get touched coordinates through COM and set the windows mouse pointer to its position. This application works like that: hCom = CreateFile( "COM1", GENERIC_READ | GENERIC_WRITE... // Open COM port for read and write ... while ( true ) { ReadFile(hCom, // read bytes from serial ... SendInput // insert mouse input (movement or click) events } ???? The question is, Could I use this application installed as a Service instead of use a WDM (or other kernel-mode) driver? What problems could arise because of this ??? 1- Will that "user-mode driver" have performance problems? 2- When the system is in low memory conditions will it have problems? 2.1 - I'm supposing this application will require less than 1Kbyte in memory for some controls variables and the COM1 file handle, I'm planning use VirtualAlloc and VirtualLock to keep it in physical memory, Does it solve the problems? 3- And what about when the system is running in low CPU contions? 4- I also have to do a USB version. All of the questions above are the same for USB? 5- I'm planing use Plug-Play and Power management functionalities. Can it be well-done using "RegisterDeviceNotification" and related funcions? The application I refer above is just a MFC console application created using Visual Studio .NET. Can I call it a User-mode device driver? Is there any framework or way to do an application so it can be called a user-mode device driver? Thanks Very Much In Advance, Edgard Lima Tag: floating point math Tag: 45665
  - 19
    - Disabling keyboard initialization routine on Windows boot? Hi all, I'm very new to driver development and have recently been assigned a project so that my team would be able to send keystrokes via an external host machine and a custom PS/2 connector. However the issue I run into is that upon boot, the OS will disable the keyboard drivers and not load them. I thought the solution might be to disable the initialization routine in the keyboard driver source code that comes with WindowsDDK. I've had no success is achieving this and have come to a wall. I've been modifying kbddep.c in the pnpi8042 folder which seems to define the hardware dependencies for the keyboard. Another option may be to simply override the Windows drivers and write my own basic ones? Any help would be much appreciated, Conway Mai AMD Intern Tag: floating point math Tag: 45659
  - 20
    - Creating a REAL Sidewinder Force FeedBack Pro (Gameport) Driver Hi! I was playing lately with my SW FFB joystick on XP. Everything worked well except that there was no force feedback at all! I've looked a little bit on those SW XP drivers and found that there is and there will be no support for force feedback on XP for SW gameport joystick, but only for USB version. Since trying to connect gameport joystick on a USB port is non-sense, I'm thinking of adding force feedback to current driver. I know that force feedback "messages" are sent thru Midi events (I have to figure out how exactly). So, the only thing we need is to create a filter driver between current SW drivers and directX. This driver (could be a user driver only and not a kernel driver) will only send FFB events from directX to Midi port, and sw_effct.dll may give some infos (I'll also have to look in it). So, am I (totally?) wrong? Or is it possible to create such a driver? Please help, I'll need some ;) Olivier Tag: floating point math Tag: 45657
  - 21
    - VWIN32_createRing0Thread Dear Sir, I have written two vxds drivers. They are talking to each other through "Direct_sys_control".In one of the driver I am using thread function "VWIN32_CREATERING0THREAD" . pROBLEM IS THAT CALLING OF VIWN32-CREATERING0THREAD IMMEDIATELY HANGS MY SYSTEM. pLZ TELL ME WHY ITS HAPPENING. Tag: floating point math Tag: 45654
  - 22
    - SetupDiEnumDriverInfo() always fails with ERROR_NO_MORE_ITEMS. I want to list Driver information for smartcardreader attached to PC ,such as Drier version,driver date,provider name and so on.I have installed a driver for reader,but SetupDiEnumDriverInfo() returns ERROR_NO_MORE_ITEMS the first time it is called. Simulating the DDK exsample Devcon ,this is my code:(I have omitted the error handling code ) DEFINE_GUID(GUID_READER,0x50dd5230,0xba8a,0x11d1,0xb5,0xfd,0x00,0x00,0xf8,0x 05,0xf5,0x30);//This is GUID for smartcard //reader,I am not sure of this,Is this definition right? //smartcardreader Guid is 50dd5230-ba8a-11d1-bf5d-0000f805f530. HDEVINFO devs = INVALID_HANDLE_VALUE; SP_DRVINFO_DATA DriverInfo; SP_DEVINFO_DATA DeviceInfo; HDEVINFO devs = INVALID_HANDLE_VALUE; SP_DRVINFO_DATA DriverInfo; SP_DEVINFO_DATA DeviceInfo; int index = 0; bool success = false; SP_DRVINFO_DETAIL_DATA DriverInfoDetails; devs = SetupDiGetClassDevsEx( &GUID_READER, NULL, NULL, DIGCF_PRESENT, NULL, NULL, NULL );//This is successful. success = SetupDiBuildDriverInfoList( devs, NULL, SPDIT_CLASSDRIVER );//also successful. while ( success ) { ZeroMemory( &DriverInfo,sizeof( DriverInfo) ); DriverInfo.cbSize = sizeof( SP_DRVINFO_DATA ); success = SetupDiEnumDriverInfo(devs, NULL, SPDIT_CLASSDRIVER, index, &DriverInfo );// Always fails here in the first cycle ,ERROR_NO_MORE_ITEMS DWORD Err; Err = GetLastError(); char a[5]; itoa(Err,a,10);//The error code is ERROR_NO_MORE_ITEMS. index++; } SetupDiDestroyDriverInfoList( devs, &DeviceInfo, SPDIT_CLASSDRIVER ); } Tag: floating point math Tag: 45645
  - 23
    - upper filter for serial hello, i'm writing a simple upper filter driver for serial port communication. i've attached it successfully above serial (DeviceTree said that too). currently i'm passing thru all of the I/O requests, just to see it worki= ng. the problem is, IRP_MJ_CREATE requests let freeze the user-mode-app beca= use there seems to be no reaction from serial. via dbgprint i can see the request in my passthru-routine but with a cal= l to IoCallDriver everything stops. also no sign of my completion-routine.= a short view of my passthru-routine: NTSTATUS PassThru(PDEVICE_OBJECT pDevObj, PIRP pIrp) { ... *pNextIrpStack =3D *pIrpStack; IoSetCompletionRoutine(pIrp,CompleteNormal,NULL,TRUE, TRUE, TRUE ); return IoCallDriver(pFilterExt->pTargetDevice, pIrp ); } = = looks very much like from the books and articles i read, but's not worki= ng. frustrating for a beginner. maybe interesting is, if i manage IRP_MJ_CREATE and IRP_MJ_CLOSE on my o= wn, some of the I/O requests (flushfilebuffers,..) seem to go down the = driver-stack correctly (i saw them in my completion routine coming back like expected= ). = But, for instance an IRP_MJ_WRITE let freeze it all again. it's very confusing for me as a beginner. thanks for your answers... Tag: floating point math Tag: 45644
  - 24
    - How to eliminate NTFS slection in "list folder contents" Hi I am writting a SD (Security Digital) driver for WinXP/Win2000 and I wish the when I format the SD the selection of the "list folder contents" can only have FAT and FAt32 for my SD folder after my driver was installed How should I do PS: my SD driver was written in SCSI miniport. thank you anyone who can give me a help. Tag: floating point math Tag: 45639
  - 25
    - Driver for Winbond W83782D Hi all, is there a driver available for chip W83782D chip? It is a very common one usually mounted on motherboard that performs hardware checking. Do you have any idea on how to get it and the specifications of its IRPs? Thanx a lot. Best Regards, Andrea Tag: floating point math Tag: 45636

Hello

I have to use floating point math(like floor, pow in std C lib math.h) in my device driver. But I heard Win NT kernel mode driver does not support floating point math

Does anyone know how to implement floating point calculations

Thank you very much for the help

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Re: floating point math by Maxim

Maxim
Thu May 27 01:21:55 CDT 2004

You must surround your calculations with KeSave/RestoreFloatingPointState.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"mingzi" <dkongmike@yahoo.com> wrote in message
news:A1CB401E-9207-4839-B5F6-2EA12F82D7F0@microsoft.com...
> Hello,
>
> I have to use floating point math(like floor, pow in std C lib math.h) in my
device driver. But I heard Win NT kernel mode driver does not support floating
point math.
>
> Does anyone know how to implement floating point calculations?
>
> Thank you very much for the help,
>

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