How can I register multiple Coms via a virtual serial port driver?

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- Previous
  - 1
    - ReInvoking MiniportInitialize from protocol driver Hi experts, I want to make Ndis call (reinvoke) my MiniportInitialize from protocol driver. This has to be done without removing and reinserting my device. First iam trying to make Ndis to call my MiniportHalt & then recall MiniportInitialize. Any suggestion welcome Thanks in advance Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86786
  - 2
    - PCI express payload mystery We have got our WDF driver up and running with an 8 lane PCI express card. It uses hardware DMA scatter gather and appears to be working well. However we are only getting about 50% of the theoretical bandwidth over 8 lanes (1GB/s instead of 2GB/s). Unfortunately we need to hit around 60%. The 50% doesn't include driver overhead and is measured by the hardware during the transfer. One of the main factors that can affect PCI express efficiency is the payload size. From what I have read the maximum payload is 4k which is supposed to give near to 100%. For 128 byte payloads with an estimated application overhead it's around 55%, and for 64 bytes it is around 40%. On our AMD platform as we are not measuring the overhead, it is feasible that we're getting 64 byte payloads (our card supports 4k). A few things we have noticed so far: ATI X1900 XT has a maximum payload size of 128 (according to SiSoft tool) Intel 965 chipset has a maximum payload size of 128 (according to the data sheet). Here are a couple of questions I hope someone can shed some light on: 1) On an AMD system PCI express is interfaced by HyperTransport which is packet based, and has a maximum payload size of 64 bytes. Does this mean its PCI express interface is also limited to 64 byte payloads? 2) Does anyone know of a motherboard chipset that supports large payloads (4k)? Apologies if this is slightly off topic, but I guessed it is something that will affect anyone writing a PCI express driver. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86785
  - 3
    - SCard reader driver is not getting registered properly hence not I have modified the ddk sample for smart card reader, pscr to support the PCI interface. I installed smart card reader driver i could able see my driver details in the registry (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MySmartreader). But, Smart Card Subsystem is not recognizing my reader, that means he is not adding my registry details to (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\calais\Reader) . I have a GEMPLUS Serial reader hardware and .sys file, which is installing and passing driver details to above registry with my inf file (with their device and vender ID). So, I think my driver initialization is not proper in the driver, I have updated all the mandatory parameter in the SMARTCARD EXTENSION Structure. What else need to be done to make my reader driver visible to the resource manager. Regards Esha Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86782
  - 4
    - AddPrinterDriver failed. Hi friends, I have used DRIVER_INFO_3 with AddPrinterDriver API to install my printer driver manually. In 32 bit OS its working fine. But in 64 Bit versions (windows Xp x64) I am getting an error message saying that "The system cannot find the path specified". (ERROR_PATH_NOT_FOUND =3). But the printer driver path is retrieved through "GetPrinterDriverDirectory" API only. Even I tried with direct addressing also.(c:\windows\system32\x64\spool\drivers\3...).But in both methods Iâ??m getting the same error message. Please suggest me how to come out from this problem. Thanks, Shankar B Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86780
  - 5
    - EMF I grant to you I m a bit confused about the workflow during a print job. Where is the best place to catch the EMF Output ? I did it now in the printprocessor trough copying the Spoolfiles. But they may a better place or a more fashionable solution. What's about catching the EMF-Commands in the printdriver or is it better to use a portmonitor ? I want to use it to catch output from vector-graphic programs. Until now I saw the best results if I choose a Plotter as Output device. Has anybody any sugesstions ? Thomas Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86778
  - 6
    - Why happen "found new hardware" ... Why happen "found new hardware" dialog after clicking uninstall the card in the device manager on vista? It seems automatically scanning. My vista version is 5600. Can anybody help me? Thank you. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86777
  - 7
    - virtual disk driver - write a volume header I am writing a virtual disk driver which uses a file as a virtual disk. The disk file can be mounted with a drive letter and normally used. Internally, ZwReadFile and ZwWriteFile in the dispatch routine for IRP_MJ_READ and _WRITE do the job to write on and read from "disk". As far, everything works fine. Now, I would like to write a volume header sector at the beginning of the disk file. This volume header sector should not be formatted by e.g. the windows format command. It should be ignored by any write operation on the disk file. I think I have to modify the StartingOffset in the VERIFY_INFORMATION when IOCTL_DISK_VERIFY comes down and shift as well the offest of IRP_MJ_WRITE to save this special sector for overwriting? Until now, e.g. the windows format begins at StartingOffset 0 and thus, overwrites my volume header sector which was previously written when the disk file was created. Any help would be gratefully appreciated. More info can be provided if applied. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86775
  - 8
    - MS toaster sample and driver signing When a new toaster device is plugged-in ( using command: enum.exe â??p 1 ) device Setup pops-up a warning that the driver is not properly signed. Question 1. If I use remote desktop the warning message is displayed not on my screen but on the primary or main screen and is not visible to me. I have to login from a monitor which is physically connected to the machine where toaster software runs in order to see this warning dialog and continue the driver installation. Any suggestions how to deal with this problem without passing WHQL tests? The workaround known to me is: go to Device Manager, find the newly created toaster device, select Update Driver and go through the installation process from the very beginning. Question 2. After installing the driver for toaster device number 1 I want to add toaster device number 2. Same warning message pops-up again. I already approved the driver installation for device number 1 and device number 2 will use the same driver. How to avoid the warning if the driver has been previously installed for another device? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86773
  - 9
    - How to not show "Hardware Installation" Dialog when install driver? Hi all, When i use command line "devcon install mobicap.inf mobicap" to install driver, it displayed a dialog to ask user for installing. I want to control this? Help me, thanks. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86764
  - 10
    - NDIS Version question. Looking at the sources file for passthru example im driver in the 2003 ddk, it is evident that for a w2k build ndis 4.0 will be used and for xp/2003 ndis 5.1 will be used. I just spent some time researching the different versions of ndis and its seems ndis 4.0 is real old and ndis 5.0 was introduced in w2k. Why then does passthru want to be built using ndis 4.0 for w2k and not ndis 5.0? The sources file looks like this ... !if "$(DDK_TARGET_OS)"=="Win2K" # # The driver is built in the Win2K build environment # C_DEFINES=$(C_DEFINES) -DNDIS40_MINIPORT=1 C_DEFINES=$(C_DEFINES) -DNDIS40=1 !else # # The driver is built in the XP or .NET build environment # So let us build NDIS 5.1 version. # C_DEFINES=$(C_DEFINES) -DNDIS51_MINIPORT=1 C_DEFINES=$(C_DEFINES) -DNDIS51=1 !endif I am tempted to change it to ... !if "$(DDK_TARGET_OS)"=="Win2K" # # The driver is built in the Win2K build environment # C_DEFINES=$(C_DEFINES) -DNDIS50_MINIPORT=1 C_DEFINES=$(C_DEFINES) -DNDIS50=1 !else ... Can anyone help me out here? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86760
  - 11
    - PoRequestPowerIrp cancel race? Isn't it a race for the sender of a power IRP to call IoCancelIrp on an IRP allocated by PoRequestPowerIrp, because the IRP may have already been completed and then freed by the power manager before IoCancelIrp tries to access the memory it may no longer occupy? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86754
  - 12
    - removable drive type versus local drive type I am looking for information on how Windows handles removable drives versus local drives at the driver level. For example, it seems that a polling mechanism exists for removable drives that can effect performance that does not exist on local drive types. I am trying to determine the differences between the two drive types from the Windows point of view. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86745
  - 13
    - DDKVersion.xml ? The 5744 WDK setup put this file in c:\winddk - what is the purpose? Regards, --PA Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86743
  - 14
    - Is there any difference w.r.t updating drivers between 56xx and 57xx Vista builds? Hi, Updating ITB device driver on 57xx Vista builds is not going through smoothly. Is there any difference b/w 56xx and 57xx Vista builds? Has anyone seen similar problems? Thanks, -Praveen Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86742
  - 15
    - WDF Class Filter Driver Installation Hi, I was wondering if anyone had experience installing a CLASS filter driver on an already existing setup class. I have found limited resources on the subject (at least for a class filter driver), and I haven't found anything on msdn on how to install a class filter driver with WDF. Their link points to here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devinst_d/hh/DevInst_d/specinst_708d78ad-ba66-40a0-946a-a0bb261e8a8a.xml.asp which directs you to use an app to do the following: 1. Call SetupInstallFilesFromInfSection for the [upperfilter_inst] section. 2. Call SetupInstallServicesFromInfSection for the [upperfilter_inst.Services] section. 3. Call SetupInstallFromInfSection for the [upperfilter_inst] section, once for each class key it wants to register the upperfilt service for. However, I think WDF is a different beast as it requires the wdfcoinstaller to install the runtime. So I am not sure if this method is what I should do (and besides it didn't work). So, I found from osronline that with wdf we are supposed to use WdfPreDeviceInstall and WdfPostDeviceInstall. How do these fit in with a class filter driver? >From what I understand, I can use those functions along with CreateService to install my filter driver's service, but what about registration? As far as I know step 3 in the older documentation says to use SetupInstallFromInfSection to register the class filter driver. Does that only add the "UpperFilters" value to the class key in the registry? Does it do anything else? When I tried to use it I didn't see any entry appear Any help on how to install a class filter driver using the WDF/KMDF would be much appreciated. Thanks! Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86737
  - 16
    - Block files at driver level? Hi, I'd like to write a driver that blcoks all write access to a certain directory (unless it comes from a binary that I wrote). I want this to occur at the driver level, but is this even possible? Thanks for any advice! Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86734
  - 17
    - cannot open input file strmif.idl in Wd3ProxyPlugin Hi all, Do you know this error ? cannot open input file strmif.idl When i compile Wd3ProxyPlugin project and got this error Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86733
  - 18
    - Windows Volume controll allways appear Is there any way you can get the windows volume controll to appear all the time? I got the volume controll on my toolbar, and it pops up when i click it, but when i click another window it disapears. Is there anyway i can get this to be on top of every window all the time? like the taskbar? and that i can move it around? if this is not possible it shuld be made as a windows addon or be included in a update or somthing. (just a tip) It would be cinda handy. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86731
  - 19
    - how can I disable ctrl+alt + del, and windows key in vista. 1.how can I disable ctrl+alt + del, and windows key. when my program is running ,disable ctrl+alt + del, and windows key. when my program leave. enable ctrl+alt + del, and windows key . In windows xp , I disable ctrl+alt + del by rewrite gina.but in vista gina is not supported. Must I write a key board driver. how can I do that. 2. if I do that, can it work well at vista. 3.I know little about DDK, how can I do it. best regards Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86729
  - 20
    - registrykeys in inf-file Is it possible to create registry-keys through in inf-file. I want to add registrykeys in an printer.inf File. Thomas Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86727
  - 21
    - MSPLOT bitmap output Hi All, I printed a bitmap/image using MSPLOT driver(plotter), but the output bitmap colors are not same as input bitmap color. The output bitmap colors are dull in appearance. What should I do to over come this problem or which part of the code I need to change or enhance? Thanks, abdul Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86726
  - 22
    - Compilation problem WDK RC1 using VS2005 Hello I am compiling my driver code in which I inlcude ntdef.h from latest WDK RC1. When I try compile I receive error message 1>D:\WinDDK\5600\inc\api\ntdef.h(1170): error C2061: syntax error : identifier 'MaximumLength' 1>D:\WinDDK\5600\inc\api\ntdef.h(1170) : error C3646: 'PCHAR' : unknown override specifier 1>D:\WinDDK\5600\inc\api\ntdef.h(1170) : error C3646: 'Buffer' : unknown override specifier 1>D:\WinDDK\5600\inc\api\ntdef.h(1170) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int After looking in the file I found structure typedef struct _STRING { __maybevalid USHORT Length; __maybevalid USHORT MaximumLength; #ifdef MIDL_PASS [size_is(MaximumLength), length_is(Length) ] #endif // MIDL_PASS >>>>> __field_bcount_part_opt(MaximumLength, Length) PCHAR Buffer; } STRING; In this structure error is coming at __field_bcount_part_opt(MaximumLength, Length) PCHAR Buffer; If somebody why this error occurs and how can we remove this please let me know. thanks and regards rohit Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86725
  - 23
    - sdbus.sys and normal sd command I need to write a driver that send command 0, command 1, command 2 , command 16, command 17 etc to MMC/CE-ATA card. but I don't know how to send this command via API provided by sdbus libarary. I called SdBusSubmitRequest(x,x) to send command 9( Send_CSD), but it failed. sample code like this: const SDCMD_DESCRIPTOR SendCsdDesc = {SD_CMD_SEND_CSD, SDCC_STANDARD, SDTD_WRITE, SDTT_CMD_ONLY, SDRT_2}; SDBUS_REQUEST_PACKET sdrp; fdoData = MarsFdoGetData(Device); RtlZeroMemory(&sdrp, sizeof(SDBUS_REQUEST_PACKET)); sdrp.RequestFunction = SDRF_DEVICE_COMMAND; sdrp.Parameters.DeviceCommand.CmdDesc = SendCsdDesc; sdrp.Parameters.DeviceCommand.Argument = 0; status = SdBusSubmitRequest(fdoData->BusInterface.Context, &sdrp); if (!NT_SUCCESS(status)) return status; what should I do? need to rewrite a sdbus driver for myself? Thanks Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86724
  - 24
    - test please ignore Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86722
  - 25
    - DrvStartDoc() is called 2 times from MS-Word printing Hi, I have a printer driver that works in Windows-XP and 2000 platform. I am trying to give a print job from Ms-word, by specifying multiple copies from PrintDlgBox. But this causes the DrvStartDoc() to get called twice. And the desired copies(recently entered in PrintDlgBox) is reflected in the second call to DrvStartDoc(). This happens only in MS.word, not in anyother application. Can anyone please tell me why this problem occurs? Thanks In advance Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86719
- Next
  - 1
    - PoStartNextPowerIrp special case I'm curious about something in "Calling PoStartNextPowerIrp" in the DDK docs. In most cases PoStartNextPowerIrp is supposed to be called just before the power IRP is passed back up or completed, except in the case of filter drivers for system power IRPs where PoStartNextPowerIrp is apparently supposed to be called before passing the power IRP down. What makes that case different? (from filters and device power IRPs or non-filters and either type of power IRP) Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86712
  - 2
    - KMDF Class Filter Drive INITSTARTFAILED Hi, I'm working on a class filter driver but to start I have installed the filter as a device upper filter on a device of the class that I am to filter on (both have services installed at boot time). It works fine as a device upper filter with the exception that in the registry key I have noticed that it sets INITSTARTFAILED to 1 for the enum key of the service (i.e. .../System/CurrentControlSet/Service/myService/Enum). However the count is 1 as is the nextInstance. I thought that if the service truly did fail that the count would be zero? The filter driver installed correctly as it does what it is supposed to do. Furthermore, setting a breakpoint on my driver entry results in the behavior expected (registers my device add and everything). It works as far as I can tell except for the INITSTARTFAILED that is set. I have deleted the key and the next time I boot it is back again. I think this may be a problem because when I try and have the filter be a class filter driver, I get an INACCESSIBLE_BOOT_DEVICE (7b) I just want to make sure this INITSTARTFAILED doesnt' have anything to do with this... In order to make the filter a class filter I have added to the key corresponding to the class guid in currentcontrolset/control/classs with UpperFilters myFilt. I have also tried putting in a CoInstallers32 wdfcoinstaller01005.dll,WdfCoInstaller since when I installed the filter as a device filter it put those values in the device instance key (am I missing something else?) So I guess I really have two questions 1. Anyone know why INITSTARTFAILED would be set to 1, but yet load the service and it function properly? 2. Anyone know if for a CLASS filter driver if there are any other values I have to set besides the UpperFilters in the registry key for the class? Thanks in advance! Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86711
  - 3
    - Registry Hi Could u please tell me as how to register the printer driver from the VC++ application. I have written a code for registry but it is not working fine. Please reply ASAP. HKEY hkResult; char temp1[]="xyz"; RegCreateKeyEx(HKEY_CURRENT_USER,"Printers\\DevModes2",0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&hkResult,NULL); RegSetValueEx(HKEY_CURRENT_USER,"Printers\\DevModes2",0,REG_SZ,temp1,sizeof(temp1)); RegCloseKey(HKEY_CURRENT_USER); Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86702
  - 4
    - USB to Ethernet miniport Adapter: SetPower Request handling. Hi, I am writing a USB to ethernet miniport driver. My question is about SetPower Request handling when device is unplugged during Standby. The Device is connected and PC is put to Standby, When the PC is in Standby mode the Device is unplugged. Now the PC is made to come out of Standby. As soon as the PC comes out of Standby we get SET_POWER Request. Since the Device is no longer connected I am returning STATUS_ADAPTER_REMOVED from the SET_POWER request. It seems to work fine in most of PC's but in a few of PC's the MiniportHaltHandler is not getting called. I tried NDIS checked build and we get a message "Assertion failed NDIS_STATUS_SUCCESS == ndisstatus" The other messages that I get are as follows "**** source file: d:\xpsprtm\net\ndis\sys\ndispwr.c, Line 1164 NdisDevicePowerOn: Miniport 82EB9AC8, PowerOn Failed by device driver for the miniport, error C0010018! NdisDevicePowerOn: Miniport 82EB9AC8, PowerOn Failed by bus or device driver for the miniport, with error C0000001!" We get the same status in the PC where MiniportHaltHandler is getting called. According to the DDK documents we should always return STATUS_SUCCESS. But since the Device is no longer connected to the PC, returing STATUS SUCCESS seems to be illogical. If we have to return STATUS_SUCCESS from the SET_POWER request all the time. Is there a specific place (function call) from where we should return STATUS_ADAPTER_REMOVED. I would be very grateful if somebody can throw some light on this. Regards, Anuj Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86700
  - 5
    - Interlocked func in between a Spinlock?! Hi! Is there any reason to use interlocked functions in between a spinlock? Thanks, greg1x Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86699
  - 6
    - Printer Driver Hi All, I am developing a printer driver. I am using MSPLOT sample of DDK. My question is, Do i have to change any code or INF file to make it install as USB or Network printer? Thanks in advance abdul Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86693
  - 7
    - Can't disable Network Cards Hi I'm writing a program that Installs Network Cards on the PC. One of the cards has probably a bugged driver and it can't be disabled from windows' "Network Connections" window(I have to disable the card during the program). The problem is, that even after uninstalling that card from the PC, other cards can't be disabled as well. Has anyone encountered such a behavior or has an idea? Thanks Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86687
  - 8
    - OID_802_11_ADD_KEY or OID_802_11_ADD_WEP Hi I'm writing a program that should set WEP key to wireless cards drivers. While snooping windows' Wireless Zero Configuration Service, i've noticed that with certain cards it sets OID_802_11_ADD_KEY and with other cards it sets OID_802_11_ADD_WEP. My question is how does WZC knows which OID does the driver expect to receive? (there are no error messages, so it doesn't just try them both...) Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86686
  - 9
    - [AVStream] How to display a interlace video with 2 fields in 1 fra Hi all, I'm writing a AVStream driver for a video capture device. The data format is ITU656, 720 x 576 and interlace. There are 2 fields in 1 frame. I fill a KS_DATARANGE_VIDEO2 structure to describe my data format. Is that right? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86685
  - 10
    - Help needed on writing a pseudo audio driver Hi, I have done lots of ground work, but could not find any satisfactory explanation on this. My requirement is like that - i will have an pseudo audio driver registered. For one of my application (voice chat application), I will select this driver for audio i/p and o/p. Application will deliver any incoming voice to the pseudo driver for audio o/p (in normal case, it would have been given to the sound card driver in the system). The pseudo audio driver will forward this voice to somewhere else(lets say X). The pseudo audio driver will get user voice i/p from X and forward it to the voice chat application (in that case X is acting as a microphone source). Initially I was thinking it won't be possible in windows. Then I came across MSVDM where they have written a driver for storing voice to a file instead of o/p it to sound card. I was thinking to tweak this for my purpose, but, as I am new to windows driver I could not understand few things. How about writing a audio filter driver? Please guide me as to what will best suit my requirement. I must admit windows is a very difficult bitch to grab. It is taking hell lot of time. the more I read more I get confused. An early reply will be very much appreciated. Any pointers or help in this regard will be highly appreciated. -paul Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86684
  - 11
    - DrvStartDoc- with no job id Hi, Can anyone tell me, what action is to be done from driver side ,if DrvStartDoc is called with job id as 0? In my code, im getting calls to DrvStartDoc twice(in case if application calls ResetDC() ) and all the document related commands are being sent to printer twice. Thanks in advance Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86680
  - 12
    - cursor background drawn with wrong bitmap. Hi, I want to achieve screen rotation with increment steps of 90 degrees. To start with I am targetting only 180 degree rotation.I have developed display driver for this. This is just a punting driver. When I get a drawing call, I am rotating the source, repositioning bounding RECT and punting it using Engxxx calls. I am facing problem with cursor back ground. When I move cursor, bounding rect of cursor is drawn with wrong image. For example when I move cursor on the desktop, cursor bounding rect of old location will be redrawn with the image which will be there if I dont rotate the screen in my driver. To achive perfect screen rotation do I need to develop any more supporting drivers like miniport filter driver etc? if yes, what should be function of that? Regards, Sunil Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86667
  - 13
    - PcNewPort the Only Way? I'm trying to develop a dummy audio device for streaming. PcNewMiniport doesnt appear to support any kind of Wave devices. PcNewPort seems affiliated with DMA and pci bus & all that jazz. I know the msavd driver just hacks around it, but is there a more sensible solution? thanks rektide Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86661
  - 14
    - I have device driver jobs in Silicon Valley If you develop drivers for graphics or audio or storage, I have fulltime opportunities at a solid and exciting company in Silicon Valley. This company is doing new and exciting things that noone else is doing yet and the opportunity to work with other smart Engineers/Developers is here!! The work is in Silicon Valley, so we need you to be there, or willing to move there from another spot in the USA (will pay relocation for right folks of course). I represent a great company, and the company is full of very intelligant, capable and creative folks! We need software developers/engineers with openGL or 3D experience, and we need people that create device drivers for Audio. We also need people that create device drivers for Windows storage (sata, scsi, raid etc). If you are seeking to work on new and exciting technology at a great company, please contact me, Maryellen O'Connell at maryell...@volt.com or call me at 888-933-8658. Thanks! Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86659
  - 15
    - Re: Disable "use This Device As Primary Monitor" always secondary monitor Hi, There was a post on this topic a couple of weeks back, but there was not reply. I am wondering if anyone knows the solution to this. i.e in the display driver disable the feature to use it as a primary monitor. Regards Mudeem Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86656
  - 16
    - ScsiDebugPrint Okay, I'm pulling my hair out over an issue that does not deserve near the amount of time I've devoted to it. I'm trying to get ScsiDebugPrint to work in a ScsiPort miniport driver. Here's what I've got: - A test "driver" with only DriverEntry. It #includes miniport.h and scsi.h. I have 4 calls to ScsiDebugPrint() in DriverEntry, with 0-3 values for first the DebugPrintLevelArg. - I link against scsiport.lib. I'm using the latest WDK. - I've tried running with a checked build of scsiport.sys that I rammed into the sys drivers dir of my target box (having turned off file protection in the registry [SFCDisable]). - I run with a debug serial hook-up to my target PC. - I've got Debug Print Filter registry entries: DEFAULT, DPFLTR, IHVBUS, IHVDRIVER, IHVNETWORK all set to dword 0xf. - If I change the driver to instead include wdm.h, link against wdm.lib, and use DbgPrint(), this works. But of course I can't use DbgPrint() w/ a ScsiPort miniport driver. Help, anyone? Thanks. -mat loik@<company>.com Synopsys Hillsboro, OR Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86647
  - 17
    - WPA2 pre-authentication I'm working on WLAN driver for Windows Mobile 5. On AKU3.0 I tested PMK cache and it works just fine. But full pre-authentication does not work. When device is connected to the AP it does not try to pre-authenticate with other AP using existing link. It cause full 802.1x authentication when first AP is turned off. Does AKU3.0 support pre-authentication? Is there any additional requerments for the WLAN driver? Thanks, Artiom Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86644
  - 18
    - NDIS driver. hello, i am developing a ndis miniport driver. my hardware is pci cardbus. i am developing miniport driver as the middle layer. currently i am getting the data from the protocol driver layer. but whatever data i am sending to the upper layer (recv path) is not recognizing. 1). can anyone tell me how to make proper packet and send it to the upper layer. 2). do i need to send the ethernet header also (14 bytes) in my data frame while calling NdisMReceiveIndicate(). ? 3). What are the main parameters need to be checked while creating a fresh packet and send it to upper layer,? thanks Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86631
  - 19
    - How to prevent share drive Hello, I've own virtual disk(similar to ramdisk) and I don't want the drive to be shared. Is it possible? I've tried IoCreateDeviceSecure and return STATUS_ACCESS_DENIED in IRP_MJ_CREATE without success. -- Marcin Gabryszewski G DATA Software www.gdata.pl address:<FirstName><dot><Surname><at><gdata><dot><pl> Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86627
  - 20
    - Reqarding the inf file creation Hi All, Currently i am working on layered driver architecture for windows XP.I wanted to create the inf file for the filter driver...Do any body have the tutorial abt what all inf file must contain or some refrences or some tool which will help me right the inf file for the filter driver. with regards jaggi Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86622
  - 21
    - wdk Vista mirror driver After making the needed changes my mirror driver is back runnning in Vista. But it act the same as before, directx stuff (like screensavers) generate a black screen. In the documentation "3 lines of extra info" they mention GCAPS2_EXCLUDELAYERED GCAPS2_INCLUDEAPIBITMAP but no futher usage doc is available. Tha sample mirror driver have the function DrvRenderhint() this seems to be total undocumented. 1) Does the mirror driver on Vista have a way to capture directx ? 2) Is there any documentation available about the changes between XP and Vista and usage of the new options ? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86619
  - 22
    - DIFx: DriverPackageGetPath on Vista Hi! It looks like that DIFx Tools v2.01 are not fully supported yet on Vista (RC1), right? (as documented in the DIFx documentation). Cause DriverPackageGetPath failes and so it can´t be used for example with InstallShield 12 installations (which includes a device driver wizard that makes use of DIFx v2.01). Here is the MSI log result: DIFXAPP: INFO: ENTER: DriverPackageGetPathW DIFXAPP: ERROR: DriverPackageGetPath is not yet supported for PnP drivers on LH. DIFXAPP: INFO: RETURN: DriverPackageGetPathW (0xA) When will it be fully supported on Vista? Must I wait for a newer Vista build or a later DIFx version? Thanks, Holger Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86616
  - 23
    - Looking for a sample UPS minidriver Hi, i'm looking for an example UPS minidriver. There's no example provided with the DDK. Can you help me ? Regards Thomas Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86612
  - 24
    - ZwXxxx calls in video miniport driver. Hi, Is it possible to make ZwXxxx calls from video miniport driver ? I tried to call ZwCreateSection and ZwMapViewOfSection. For these function I included wdm.h and ntddk.h. But as soon as I included these two files, many redefinition errors came in header files. I think there is some conflict in video.h , miniport.h and wdm.h . ntddk.h. I also read in ddk that video miniport driver can call only VideoXxxx and AgpXxx functions that are exported bye videoport driver i.e. videoprt.sys. Is this correct. Please , if anyone has some idea then do let me know. Thanks. Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86611
  - 25
    - Device removal and "create requests" When the DDK says to fail "create requests" after succeeding an IRP_MN_QUERY_REMOVE_DEVICE, is it talking about IRP_MJ_CREATE? I'd previously thought most drivers don't do anything for IRP_MJ_CREATE. Is this a typo, since it also says that protection against new open handles should already be taken care of by the OS except in broken old Windows 98/Me (and open handles is what IRP_MJ_CREATE implies, isn't it)? Tag: How can I register multiple Coms via a virtual serial port driver? Tag: 86606

Hi friends,
I have written a virtual serial port driver using a pair of bulk
endpoint of USB. It can register a virtual COM symbol such as "COM3" in
my computer. The driver function well using WIN32 applications.
Now I have requirement to emulate 3 COMS at the same time in host
computer via this pair of bulk endpoint.
Questtions:
1.First I have to find a feasible way to register 3 COM symbol,
they are symbolic link to FDO, how can I register them at the same
time?
2.Only one PDO(physical device object) is created by lower USB
driver , then I have to register 3 FDOS(functional device object) ,
fatal error occured when I attach them to PDO using
IoAttachDeviceToDeviceStack(), How can I deal with it?
3. Is there any sophisticated virtual driver sample for my
requirement?
Waiting for expert's comments. All your comments are welcome.

Thanks in Advenace,
Conan

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