Difference between CreateFile & Com_Open

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- Previous
  - 1
    - NDIS and memory 2 Hi all, Is it possible to use paged memory in NDIS drivers? I found ExAllocatePool in list of prohibited functions and ExAllocatePoolWithTag in list of discouraged functions and both NdisAllocateMemory and NdisAllocateMemoryWithTag allocate only nonpaged pool. Does it mean that paged memory shouldn't be used in NDIS drivers? Thank's for answer Michal Tag: Difference between CreateFile & Com_Open Tag: 63937
  - 2
    - How to enumerate USB Mass Storage devices? hello. i'm working on a hobby project for my own mp3 (usb mass storage) player and try to enumerate all usb mass storage devices currently connected to my computer. i've been working on this quite a while because i can't get through the msdn efficiently enough. i planned to identify my player like this: 1) enumerate all disks (by SetupDiEnumDeviceInterfaces in conjunction with guid GUID_DEVINTERFACE_DISK) 2) find out those who are mass storage devices (IOCTL_STORAGE_GET_MEDIA_TYPES_EX) 3) get each mass storage device's partition info 4) get a handle to the volume i chose the method above because i wanted to avoid a low level enumeration through the usb hubs. now i'm stuck with step 2 because i don't know how to find out the correct buffer size, needed by DeviceIoControl for the IOCTL_STORAGE_GET_MEDIA_TYPES_EX flag. the documentation didn't explain a proper use any further. so i wonder if any veteran can give me a hint, how to find out the buffer size. thanks. wan-hi Tag: Difference between CreateFile & Com_Open Tag: 63927
  - 3
    - Serious problem with IO manager and device removal Hi All Scenario: i)PnP NIC PcCard USB driver with an IO manager interface created with NdisMRegisterDevice(). ii)Application opens device with CreateFile() and gets a valid handle. iii) Stop NIC driver with Safely Remove Hardware. (Driver Halt function gets called and devext is freed) iv) Application calls DeviceIoControl() on the STILL VALID HANDLE. v) NIC driver image stil in memory, so IOCTL handler called which refgerences the now invalid devext. vi) CRASH. Now, to quote the DDK: "Note that, if a handle to the device object created with NdisMRegisterDevice is open, the driver that created the device object cannot be unloaded." Oh yeah, even NdisMDeregisterDevice() returns 0 if an application still has the handle open. And further: "Before opening a handle to the device object, a user-mode application should therefore register for device event notification, specifying GUID_NDIS_LAN_CLASS as the interface class GUID. On receiving a DBT_DEVICEQUERYREMOVE device event for the device object, the application should close the handle" So it is up to the good behaviour of an application to controlll wether the kernel crashes or not. Hmmm not a very good idea. I suggest the IO manager returns INVALID_HANDLE_VALUE if the device got unloaded and an app calls an IO manager function on it. Tag: Difference between CreateFile & Com_Open Tag: 63924
  - 4
    - Trying to get an IM filter driver to bind to my IM MUX driver at install time Hi, I've got an NDIS IM MUX driver, which is based on the MUX sample in the W2k3 DDK. I'm trying to get an IM filter driver to bind to this, at *install time*. This filter driver is bound to the physical miniport before install (along with TCPIP, MS Client, File & Printer sharing). I've built the MUX notifyob with "DISABLE_PROTOCOLS_TO_PHYSICAL" defined, so ideally, i would expect that after the install, all the protocols that were bound to the physical NIC should now be bound to the MUX miniport. Unfortunately, the filter driver is not bound to it (incidentally, neither is the nlbs driver). I can bind the filter driver after the install, manually from the UI, by checking the box on the MUX miniport, so there isnt anything in the NDIS upperRange or lowerRange to prevent the binding from happening. I've stepped through the notifyobject in the debugger (from breakpoints in SysQueryBindingPath, and NotifyBindingPath) to see if the notifyob ever even got the binding paths with the filter driver in it. I didnt see any. The filter driver's protocol inf has the following interesting lines: 1. [ndi] Characteristics = 0x4490 ; NCF_NDIS_PROTOCOL | NCF_HAS_UI | NCF_FILTER | NCF_NO_SERVICE 2. [AddReg] HKR, Ndi, FilterClass, , failover HKR, Ndi\Interfaces, UpperRange, , noupper HKR, Ndi\Interfaces, LowerRange, , nolower HKR, Ndi\Interfaces, FilterMediaTypes, , "ethernet, nolower" Why isnt the filter drivers binding paths showing up in the notifyob methods ? Alternatively, is there any other way to programmatically bind the filter driver to the MUX driver ? (This is what i really want to achieve) Thanks, Gaurav Tag: Difference between CreateFile & Com_Open Tag: 63920
  - 5
    - Design considerations of usbhub.sys, usbehci.sys.... Hi, About usbhub.sys, usbehci.sys, usbohci.sys, usbuhci there is no documentation available in the DDK. Any help / Any articles regarding the usbhub.sys & usbehci.sys architecture, design considerations (codelevel), URB management, URB queueing, URB Chaining, handling Isochronous & Bulk devices and any other code level architectures? Thanks, Shravan Tag: Difference between CreateFile & Com_Open Tag: 63907
  - 6
    - IOCTL ATA PASS THROUGH.. my task is to copy the 'My Doucments' folder to a specified partition on my local hard disk (using win xp - sp2) Has anyone been able to obtain sample code for this or Any info or directed/related links greatly appreciated. Many thanks in advance. Meyya Tag: Difference between CreateFile & Com_Open Tag: 63897
  - 7
    - Printer driver woes I'm using the bitmap driver sample from the LDK, and am running into a few problems. All I want to do is take the individual scan lines and pass them to an existing DLL that then does some processing. I can't seem to get the FilterGraphics method to get called. I'm return S_OK in the GetImplementedMethod, but no joy. Any hints on how to get that method called would be most appreciated. Since I can't get FilterGraphics working, I've been using ImageProcessing. I've set the PinsPerPhysPass and PinsPerLogPass commands in the GPD to 1, 8, 16 and several other variations, but I always get the same pSrcBitmap sizes when ImageProcessing is called. How do I tell it to only send me one scanline at a time? -- Floyd Tag: Difference between CreateFile & Com_Open Tag: 63896
  - 8
    - DrvTextOut/DrvSendPage overlap Hi, I have written a monolithic printer driver. There is a problem when using MS-Office applications and printing with the my driver. My driver defines fonts that are resident in the printer. Most of the time, the driver works fine using MS-Word and selecting the printer fonts. However, occasionally, the page is terminated too soon. I have narrowed it down to where my DrvTextOut is interrupted (has not hit the return statement yet) by a call to my DrvSendPage (same PDev too). This seems to happen totally random. How can this happen? What should my driver do in this case? It seems like a bug with MS-Office, but I've never heard of it. Any ideas? Please? I'm getting deperate. Thanks Tag: Difference between CreateFile & Com_Open Tag: 63890
  - 9
    - How do I determine modem type? Hi, If I'm looking at modem entries in the registry (class "Modem"), how can I determine the modem's physical connection to the system? For example, how can I tell if a specific modem is connected through PCI, USB, IR, Bluetooth, etc.? I noticed that the "MatchingDeviceId" value (SPDRP_HARDWAREID) usually has the correct type in it, but a few modems seem to be misleading. For example, I have a PCMCIA modem that seems to think its a USB device (apparently it implements a USB hub inside the card, but its not available externally). Is there some other way to determine the physical connection type? Thanks, Ed. Tag: Difference between CreateFile & Com_Open Tag: 63885
  - 10
    - USB Video Capture frame rate drop after Standby/Wake-up cycle Our USB Video Capture device running on XP on USB 2.0 runs at 30 fps. However, if we put the system into Standby mode while capturing a video (either capturing to file or simple video preview) then when the system awakes the video capture resumes but at a frame rate which now fluctuates around 24fps and goes as low as as 22 fps. It is visibly slower - not just a quirk in frame-rate reporting. This reduction in frame rate is not cumulative. i.e. if we repeatedly go into Standby mode and reawaken it remains at around 24fps. The framerate can be is restored to 30fps by simply stopping and restarting the video capture application. The problem does not occur if we attach our device on a USB 1.1 port; the framerate then remains constant through Standby/Wake-up cycles. We have tried to test this on other vendor's USB video capture devices to determine if it is a problem in our drivers but to date have not yet found one that can survive running an application through a Standby/Wake-up cycle without other, far more serious problems. Any assistance, or redirection to a more appropriate forum would be appreciated. Steve Thorpe Tag: Difference between CreateFile & Com_Open Tag: 63884
  - 11
    - OID_802_11_BSSID_LIST_SCAN I try to get signal strength and MAC's of all access points in user-mode. I try to make it without NDISUIO writing in pure C. I made a little app which uses WMI and Setup Api to find wireless network card. Unfortunately I do not know how to SET OID_802_11_BSSID_LIST_SCAN oid. Passing it to DeviceIoControl with IOCT_QUERY_GLOBAL_STATS returns FALSE and error: "50. The network request is not supported." ERROR_NOT_SUPPORTED". Although using only the query: OID_802_11_BSSID_LIST seems to work (list refreshes itself) but e.g. when I run Netstumbler (during work of my app) DeviceIoControl fails and getlasterror() shows error: "31 A device attached to the system is not functioning. ERROR_GEN_FAILURE ". And the most irritating thing is, that Netstumbler sees more access points than my programm. help..... -- Thanks, Wojtek E-mail hint: add [usenet] to the subject "Ipsa scientia potestas est." Tag: Difference between CreateFile & Com_Open Tag: 63878
  - 12
    - Remove one of the prefered networks in Wireless Connections Hi, In "wireless network connection properties" there is "wireless network" tab that has a list in the prefered networks box. Is there an API to remove one of those entries ? I have heard of IProvisioningProfileWireless that may help to create one, but did not see anything that is related to remove. Thanks, Gilad. Tag: Difference between CreateFile & Com_Open Tag: 63862
  - 13
    - Implementing HideStandardUI Hi. Newbie question: What do I have to do to be able to implement the HideStandardUI-method? I have tried to change to inherited interface to IPrintOemUI2 instead of IPrintOemUI, but that doesn't seem to work as I get a compilation error. /Erik Tag: Difference between CreateFile & Com_Open Tag: 63861
  - 14
    - NDIS: Ethernet checksum Hi all, I'm interested in following questions. Who is in charge of ethernet frame's checksum? It means if I change ethernet frame in my NDIS IM, will I have to "repair" checksum too, or it is done in underlying miniport? Thank's for answer Michal Tag: Difference between CreateFile & Com_Open Tag: 63854
  - 15
    - user unable to print on windows 2000 cluster via port monitor. Hi I have written a cluster aware port monitor. It works fine in a normal environment. BUT when it is used on a Windows 2000 cluster, only users with Administrator rights can print!! Normal users fail to print..... Looking at my debug it seams that the monitor is failing on reading the cluster registry when the 'normal' user is attempting to print. Now I thought this was left to spooler /portmonitor, not to the user permissions. What I am asking is :- 1. Have I made a mistake in the configuration of the culster? with user permissions etc. or 2. Have I missed something in the port monitor its self? I have been trawling through the msdn documentation but have come up with nothing. Any tips would be welcome as its driving me mad. Cheers Tag: Difference between CreateFile & Com_Open Tag: 63849
  - 16
    - PC won't boot if my device is connected to the USB port Hi, Please would anyone tell me what could be the problem when the PC stops booting when we have the device(a phone) connected to the PC. when i plug the device out of the PC the booting resumes. It does not happen all the time. It is mostly likely to happen when we restart the PC with phone connected. If we do a shutdown and then boot it is less likely or does not happen. This is not specific to any Windows version. happens both on XP and 2k as well. Is it trying to boot from the phone? Any idea?? , thanks, mridu Tag: Difference between CreateFile & Com_Open Tag: 63848
  - 17
    - where is USBVideo.sys? Hi, The DDK says that UsbVideo.sys ships with XP SP2. I have SP2 but on UsbVideo.sys. Please let me know where to find it or download it. Thanks. Tag: Difference between CreateFile & Com_Open Tag: 63844
  - 18
    - One more bug - please vote http://lab.msdn.microsoft.com/ProductFeedback/viewFeedback.aspx?feedbackId=FDBK28013 -- http://www.cristalink.com Tag: Difference between CreateFile & Com_Open Tag: 63840
  - 19
    - NDIS and Memory Hi all, I'm not sure in following question ... Is it correct to use ExAllocatePool( PagedPool, size) in NDIS IM (in part running at PASSIVE_LEVEL) or there is an other Ndis specific function? Thank's for answer Michal Tag: Difference between CreateFile & Com_Open Tag: 63838
  - 20
    - AVStream : Remote controller (IR) Dear All, I am developing an AVStream device driver for an MPEG2 USB box. Now I want to implement the remote controller (IR) function. But I don't know what kind of device drivers (HID, IrDA NDIS and etc) should I implement? Where could I get remote controller (IR) sample driver codes? Any comments are very appreciated. Thanks, Edward Tag: Difference between CreateFile & Com_Open Tag: 63836
  - 21
    - Does exist this file on disk ? Is possible to verify in kernel mode if some file on disk exist without calling InitializeObjectAttributes() and ZwCreateFile() and controlling result status ? Does exist some method for enumeration files in directory without using ZwCreateFile() ? Peter Tag: Difference between CreateFile & Com_Open Tag: 63835
  - 22
    - question about still image capture device definition. Hi, We are developing usb2.0 camera. Now, i have some question want to confirm: first, If my usb camera's firmware writted according to Still image Capture device class and i want to capture an image from WIATEST or TWAIN application, what should i do in PC side? Should I writte user mode driver or some dll linking to application? second, If my device is standard still image capture and i want to provide a set of API to customer, what document should i refer? Best Regards Tag: Difference between CreateFile & Com_Open Tag: 63825
  - 23
    - keyboard filter driver Hi, Currently iam doing a keyboard filter driver based on kbfiltr example from ddk. My objectives are to 1. Insert multiple keystrokes from a single key press. For example, when user press <a> i must send it as <SHIFT><F1> in the same context of <a>. 2. Drop and remap multiple keystrokes. For example,when user press <ALT><F2> I must send it as <b> In my previous post,Mr.Doron suggested me the following for my 1 objective. >>>>>>>>>>>>>>>>>>>>>>>Doron's post>>>>>>>>>>>>>>>>>>>> >> if this is with in the context of <a> being reported to your own callback, >> just declare a KEYBOARD_INPUT_DATA array on the stack, initialize it, then >> call the upper service callback with the new keystrokes, then finally report >> <a> using the caller's buffer. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I tried to execute what Doron told,and in the usermode application trace, iam getting <SHIFT><F1><F1><F1><F1><F1><F1>...... where <F1> goes infinite. Can anyone plz tell me where iam doing wrong ? below is my code. Please give me some suggestions or reference for my 2 objective too. Thanks for the patience shown to read this on. >>>>>>>>>>>>MY CODE >>>>>>>>>>>>>>>>>>>>>>>>>>>>> VOID KbFilter_ServiceCallback( IN PDEVICE_OBJECT DeviceObject, IN PKEYBOARD_INPUT_DATA InputDataStart, IN PKEYBOARD_INPUT_DATA InputDataEnd, IN OUT PULONG InputDataConsumed ) { PDEVICE_EXTENSION devExt; ULONG i=0,j=0; KEYBOARD_INPUT_DATA data[1]; devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension; i = (ULONG)((PCHAR) InputDataEnd - (PCHAR) InputDataStart); for(j=0;j<i;j++) { if(InputDataStart[j].MakeCode != 0) { switch(InputDataStart[j].MakeCode) { case 0x1E: // If scancode for <a> data[0].UnitId = 0; data[0].MakeCode = 0x2A; // Left Shift data[0].Reserved = 0; data[0].ExtraInformation = 0; if(InputDataStart->Flags == KEY_MAKE) data[0].Flags = KEY_MAKE; else if(InputDataStart->Flags == KEY_BREAK) data[0].Flags = KEY_BREAK; (*(PSERVICE_CALLBACK_ROUTINE) devExt->UpperConnectData.ClassService)( devExt->UpperConnectData.ClassDeviceObject, data, data+1, InputDataConsumed); InputDataStart[j].MakeCode = 0x3B; // F1 break; default: break; } } } (*(PSERVICE_CALLBACK_ROUTINE) devExt->UpperConnectData.ClassService)( devExt->UpperConnectData.ClassDeviceObject, InputDataStart, InputDataEnd, InputDataConsumed); } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Tag: Difference between CreateFile & Com_Open Tag: 63824
  - 24
    - Is anyone familiar with the sonydcam.sys sample? Hi, I have a 1394 camera that is IIDC (DCAM) compliant. I would like to connect this camera to a DirectShow based viewer, but the camera does not have a WDM driver. Apparently, the Windows DDK has a sample called 'sonydcam.sys', which I believe is a WDM Stream Class driver. Unfortunately, when I tried connecting the camera using the associated 'image.inf' file it did not work. Obviously, I'm new at this and would like to ask the following questions: Questions: 1. Is the sonydcam.sys file a WDM Stream Class driver for DCAM cameras? 2. If it is a WDM driver, can I modify the image.inf file in some way so that it would recognize my camera as 'Generic'? 3. To view the camera with a DirectShow app, do I need more than the sonydcam.sys file? Thanks for any help. RickL Tag: Difference between CreateFile & Com_Open Tag: 63822
  - 25
    - Converting 32bit drivers to 64bit Is there some kind of conversion tool to change 32bit driver to 64bit driver. I heard there was some way to change it manually but dont know if it's possible. Thank you Eric Tag: Difference between CreateFile & Com_Open Tag: 63817
- Next
  - 1
    - Filter Hook Driver and NAT I have written a application based on the Windows 2000 Filter Hook Driver. Basically the application was designed to run on a Windows 2000 server with two Network interfaces. It monitors traffic between the two interfaces and enforces security, performs proxy redirection, etc. When the Windows 2000 Server is configured for routing mode and both interfaces have real address subnets (in other words Network Address Translation (NAT) and Internet Connection Firewall (ICF) are not enabled), the hook correctly works and our application receives the packets (header and payload). However, when NAT or ICF is enabled (the network we are checking security on does not have real addresses) the Packet pointer (payload) passed to us is NULL. Therefore we can not look at the rest of the packet to make a determination of what we should do. See this link for the call back function description (parameter two is the one that we are not getting): http://msdn.microsoft.com/library/en-us/network/hh/network/fltrhook_cb402c5c-f5db-498b-8db6-c2994bbf7870.xml.asp Why does the behavior of the Filter Hook Driver difer betwen NAT and routing mode? I would think the behavior should be the same regardless. Tag: Difference between CreateFile & Com_Open Tag: 63808
  - 2
    - Irp->IoStatus.Status vs return value? Hi All, What is the difference between setting Irp->IoStatus.Status and the Dipatch function return value? I have a little trouble seeing the difference between those, as they seem to fulfil the same functionality, ie telling the system about the status of the Irp. kind regards, Bruno. Tag: Difference between CreateFile & Com_Open Tag: 63791
  - 3
    - USB COM port as Serial port Hi All, Here is my problem. I have a USB modem which is exposing COM port with help of usbser.sys. Everything works fine with microsoft Dial up connectoid. When I am trying to use the USB COM port as normal serial port interface through serial IOCTLs it fails. I am accessing the port from my WDM driver. I am able to get the device object pointer of the port and able to dereference the same, but I am failing in configuring the port like set baudrate. Can I use this USB com port exposed in modem as normal serial port interface. Waiting for expert's comments. All your comments are welcome. Thanks in Advenace, Cyril Tag: Difference between CreateFile & Com_Open Tag: 63784
  - 4
    - rundll32 printui.dll,PrintUIEntry Question I did a setup program in VB to install a printer driver using rundll32 printui.dll,PrintUIEntry for a silent installation. When trying it on a PC with Windows 2000 Professional just installed, it seems to have a problem installing. We installed a previous version of our driver and it created the folder C:\WINDOWS\system32\spool\drivers\W32X86\3 and then the setup program worked with the new driver. It seems to be unable to create the "\3" folder. It only works when that folder exist. I would like to know what is the "\3" folder and what creates it in a printer installation. -- Mario Tag: Difference between CreateFile & Com_Open Tag: 63782
  - 5
    - using devcon or dpinst for serial driver install I'm running a windows XP system with 2 standard serial ports. I have a proprietary driver (Mydriver.sys) that i want to install with DPInst on just one of the COM Ports. Both ComPorts however use the same Device ID ( *PNP0501), so DPInst will automatically install the driver for both COM Ports. Is there a way to install the driver for just one of the com ports? Would it be better to use devcon? Tag: Difference between CreateFile & Com_Open Tag: 63779
  - 6
    - Unloading driver Hy All, I've made a Pnp driver that I can load / unload in normal conditions (I can see that the module is unloaded when I disable the last device using that driver). The thing is that my driver is also a bus driver. And once the child driver has been plugged, loaded and unloaded (everything seems ok there), when the the bus driver is disabled, the device is correctly removed but the module is not unloaded (and I then have to reboot in order to update the .sys). Any hint on what could be stuck somewhere in my stack that could prevent the driver from being unloaded although both chil and bus devices are unloaded???? Many thanxes in advances, Francois. Tag: Difference between CreateFile & Com_Open Tag: 63770
  - 7
    - WIA Scan minidriver--WHQL(ACPI) Problem I am facing a problem in WIA minidriver for Scanner through USBScan channel. I have used the sample WIA scan minidriver sample provided in DDK and modified the device communication part with USB scan. My minidriver works perfectly fine and scanning can be performed through WIA dialog, WIA enabled application (Adobe Photoshop) and TWAIN enabled application like (MS WORD, Kodak Imaging etc). But the WHQL test fails in ACPI scanner. I have tried my level best to solve this issue of WHQL but unable to get any clue. If you gurus are helping me out in this regard it will be a great help to me. Any clue in this regard will be greatly appreciated. I am attaching the Logs along with this mail. Hope to get a help from you all. Regards, Deb. Tag: Difference between CreateFile & Com_Open Tag: 63753
  - 8
    - 64 bit printer driver problem bugcheck 0x3b when print to file Hi, Any tips on this issue is highly appreciated.. In AMD 64 bit printer driver on Win XP 64 bit beta 1 sp 1, When I print to file or FILE port from 64 bit application works fine....when printed to file from 32 bit application It crashes the OS with BSOD of bugcheck 0x3b SYSTEM_SERVICE_EXCEPTION ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* SYSTEM_SERVICE_EXCEPTION (3b) Arguments: Arg1: 00000000c0000005 Arg2: fffff97fff03d9b1 Arg3: fffffadfe23b2060 Arg4: 0000000000000000 STACK_TEXT: fffffadf`e23b2878 fffff97f`ff2b52f5 : fffffa80`0209de60 00000000`00b05800 00000000`00000000 00000000`00000000 : win32k!EngMultiByteToUnicodeN+0x1161 fffffadf`e23b2880 fffff97f`ff2b580d : 00000000`03d70040 00000000`00000000 fffffadf`e23b2980 fffffa80`0209de60 : win32k!EngSetPointerTag+0x11385 fffffadf`e23b2950 fffff97f`ff14163b : fffffadf`e23b2a68 00000000`00000002 fffffa80`00000002 fffffa80`027fc020 : win32k!EngSetPointerTag+0x1189d fffffadf`e23b2a30 fffff97f`ff14143a : fffff680`00000001 fffffa80`002f7ed0 00000000`00000000 00000000`00000074 : win32k!EngAllocUserMem+0x69b fffffadf`e23b2bb0 fffff800`01041422 : 00000000`0a210471 fffffadf`00000074 00000000`002dcea8 fffffadf`00000002 : win32k!EngAllocUserMem+0x49a fffffadf`e23b2c70 00000000`78bc7eaa : 00000000`78bbc521 00000000`0013e5a0 00000000`78bf89dc 00000000`00000002 : nt!ZwUnloadKey+0x2092 00000000`0013e4a8 00000000`78bbc521 : 00000000`0013e5a0 00000000`78bf89dc 00000000`00000002 00000000`002dcdb0 : wow64win!Win32kCallbackTable+0x35a3a 00000000`0013e4b0 00000000`0013e5a0 : 00000000`78bf89dc 00000000`00000002 00000000`002dcdb0 00000000`00000014 : wow64win!Win32kCallbackTable+0x2a0b1 00000000`0013e4b8 00000000`78bf89dc : 00000000`00000002 00000000`002dcdb0 00000000`00000014 00000000`002dd208 : 0x13e5a0 00000000`0013e4c0 00000000`00000002 : 00000000`002dcdb0 00000000`00000014 00000000`002dd208 00000000`041f58e0 : wow64!Wow64EmulateAtlThunk+0xbddc Crashes at IMAGE_NAME: win32k.sys Similar issue I see in KB Artilce(823650) at Printer KB Articles BUG: The ExtEscape() Function Is Unsuccessful When You Print from a 32-Bit Application on a 64-Bit Version of Windows (823650) Unfortunately the link doesn't seem to work... Thanks, Shiva P Tag: Difference between CreateFile & Com_Open Tag: 63752
  - 9
    - IRP_MN_QUERY_CAPABILITIES return STATUS_WAIT_2 Dear Sirs. please give me some words. What should i do when Windbg appears IRP_MN_QUERY_CAPABILITIES worning messages during HCT testing? The HCT will pass IRP_MN_QUERY_CAPABILITIES irp to my driver , and then my driver will wait (if STATUS_PENDING returned )and pass it down to the low layer driver.My driver will do some working after low layer driver complete IRP_MN_QUERY_CAPABILITIES . Now , i don't know what should i do when HCT testing program make the low layer response me STATUS_WAIT_2. Sould i return STATUS_PENDING or STATUS_UNSUCCESSFUL , or? What is the meaning of STATUS_WAIT_2? Tag: Difference between CreateFile & Com_Open Tag: 63742
  - 10
    - Problem with the NDIS MUX IM driver (decapsulation not working) Hi, I'm using the Win2003 DDK and MUX sample, building using ddk tools. Running the driver on Win2003 machines. I'm writing a MUX IM driver based on the sample to do some form of 'tunneling'. I slap on my own ethernet header infront of the real ethernet header (with a custom eth type) when sending packets down (MiniportSendPackets). When my IM receives a packet (ProtocolReceivePacket, ProtocolReceive) with my header, I take it off and send the packet up. The problem i'm seeing is that the IM driver takes this extra header off, but the higher layer protocols seem to get this packet with the original tunneling header included. I've verified that i take the header off by stepping through my code in the debugger, and, I've verified that higher protocols get the original packet by attaching ethereal to the IM miniport. Whats interesting is that this thing worked 2 weeks ago. A couple of things could have changed, but i've tried to roll back everything to then, and i cant seem to get it to work. One thing that i noticed today is that earlier i was sure that my packets were coming in on ProtocolReceivePacket. Now i see all my packets coming in on ProtocolReceive. I'm wondering if this is a problem. I've attached my code snippet below. I'm also suspicious of this line: NDIS_SET_ORIGINAL_PACKET(MyPacket, NDIS_GET_ORIGINAL_PACKET(Packet)); Maybe someone in an upperlayer protocol is ignoring MyPacket and using the OriginalPacket instead ? Someone had posted in 2002 how they faced a similar issue - their IM was stripping of part of the packet, yet upper layer protocoles were getting the original packet. Their problem was something to do with retransmissions but it doesnt make sense here to me. Anyone seen anything like this ? I've been debugging this for 3 days now and i'm running out of ideas. Suggestions/Hints/Comments welcome. Thanks, Gaurav ------------------------------------------------------------- Heres how my code strips the header off (based off the MUX sample) called from ProtocolReceice and ProtocolReceivePacket. // // Strip off the tag header "in place": // pDst = (PVOID)((PUCHAR)pVa + TAG_HEADER_SIZE); // // Allocate a new buffer descriptor for the first // buffer in the packet. This could very well be the // only buffer in the packet. // NdisAllocateBuffer(&Status, &pNdisBuffer, pVElan->BufferPoolHandle, pDst, BufferLength - TAG_HEADER_SIZE); if (Status != NDIS_STATUS_SUCCESS) { // // Drop the packet // Status = NDIS_STATUS_RESOURCES; MUX_INCR_STATISTICS(&pVElan->RcvResourceErrors); break; } // // Prepare the new packet to be indicated up: this consists // of the buffer chain starting with the second buffer, // appended to the first buffer set up in the previous step. // MyPacket->Private.Head = NDIS_BUFFER_LINKAGE(Packet->Private.Head); // // Only one buffer in the packet // if (MyPacket->Private.Head == NULL) { OnlyOneBuffer = TRUE; } NdisChainBufferAtFront(MyPacket, pNdisBuffer); if (OnlyOneBuffer) { MyPacket->Private.Tail = MyPacket->Private.Head; } else { MyPacket->Private.Tail = Packet->Private.Tail; } ------------------------------------------------------------- Tag: Difference between CreateFile & Com_Open Tag: 63741
  - 11
    - which verifier is the most rigorous? As Windows improves, so does driver verifier's ability to spot problems. At this point, which driver verifier is the most rigorous of them all? The ones I would think would be in the running are Windows x64, 2003 Server, and XP SP2. Related question: are there any other similar tools out there? Tag: Difference between CreateFile & Com_Open Tag: 63739
  - 12
    - usb mass storage in win Me I have a lower filter driver for usbhub.sys for my usb composite device.It is working fine in Win 2K and win XP enumerating all three functions (Audio,video and mass storage ) properly .However in Win Me, the mass storage is not enumerated properly. I saw that in the registry in Win 2K the CompatibleID created is USB\Class_08&SubClass_06&Prot_50,USB\Class_08&SubClass_06,USB\Class_08 while in Win Me it is USB\CLASS_08&SUBCLASS_06&PROT_80,USB\CLASS_08&SUBCLASS_06,USB\CLASS_08 My device has Protocol Id 50 in it's interface descriptor If I manually change the id in the registry to 50 in win Me ,the mass storage driver (usbstor.sys ) is loaded and the it's works fine any hints on how I could go about debugging this issue are welcome ? Tag: Difference between CreateFile & Com_Open Tag: 63734
  - 13
    - porting WDM driver to solaris Hello All, The task I have is to create a driver for a device that will run under Solaris (in a new SunBlade 2500). I have developed a WDM driver for the device that runs great under Windows XP, and haven't ever developed a driver for a UNIX based kernel. The question I have is; Is there a way to use my existing WDM code to create a Solaris kernel driver, or maybe a Linux kernel driver? Any thoughts greatly appreciated, Brendan Illingworth Tag: Difference between CreateFile & Com_Open Tag: 63733
  - 14
    - How to test BDA driver useing HCT?? dear all, I want to get WHOQ log , how to test my bda driver by HCT first?? thanks Tag: Difference between CreateFile & Com_Open Tag: 63727
  - 15
    - How to get the current resolution size of the 2nd monitor? Hi all, I am having two monitor displays. I want to know the current resolution (horizontal number of pixels x vertical number of pixels) of the second monitor? How to do that? If it is the primary display, I can easily get its current resolution using the following apporach. XRes= (double)GetSystemMetrics(SM_CXSCREEN); YRes= (double)GetSystemMetrics(SM_CYSCREEN); But how to do that for the second monitor? Also, how to set the second monitor to a certain resolution? For example, how to first enumerate its resolution list and pick an supported resolution to switch the current resolution to that target resolution? thanks a lot Tag: Difference between CreateFile & Com_Open Tag: 63726
  - 16
    - bogus PREfast warning I am running DRVfast (PREfast for drivers) on my IM driver, and see the following warnings: warning 8126: The AccessMode parameter to ObReferenceObject* should be IRP->RequestorMode. warning 309: Potential NULL argument 3 to 'ObReferenceObjectByPointer'. The "offending" source line looks like this: status = ObReferenceObjectByPointer(pCtx->pDeviceObject, FILE_ALL_ACCESS, NULL, KernelMode); The MSDN docs for 'ObReferenceObjectByPointer' say that the 3rd argument SHOULD be 'NULL' for lower-level drivers, and it also says the 4th argument SHOULD be 'KernelMode'. Can I in any way tell PREfast that my driver is a "lower-level driver" ? / Hannes. Tag: Difference between CreateFile & Com_Open Tag: 63720
  - 17
    - DiskProbe Microsoft support tool Hi, I saw this pretty useful tool which allows to directly manipulate the disk bits.How is this utility being written? I have tried looking at win32 file system apis and have seen no way of reading the low level disk bits of a volume (FAT/NTFS) to be displayed in a editor. Is the utility using undocumented APIs to acheive this? Thanks Vipin Tag: Difference between CreateFile & Com_Open Tag: 63708
  - 18
    - pscript5 customization Ok here is my setup. My company uses pscript5 as the driver for there software printer. We use our own port monitor to show a dialog box to the user so they can save to disk in various file formats. My goal is to be able to share this printer on a server machine, and have the clients get the dialog box on there machine, instead of on the server. What I think needs to happen is I'll have to update/replace/mod the pscript5 driver so that when its shared over the network it will be installed on the new machine, and when the user printer from that new machine the driver will cause a dialog box to display on that users machine before sending anything over the network (maybe never send anything). This way a client can use the printer and save what ever there printing to disk. I've tried a few approaches to doing this but seem to hit dead ends. If some one could point me in the correct direction I can follow the path. Just for reference I've already gotted the ddk and managed to compile the oemps drivers, but cant figure out how to install them, I've also tried writting wrapper dlls for the pscript5.dll tried creating inf files for them. Thanks in advance, Eric Brooks Tag: Difference between CreateFile & Com_Open Tag: 63697
  - 19
    - AddPrinterDriver returns ERROR_EXE_MACHINE_TYPE_MISMATCH I seem to be doing something wrong wherein the AddPrinterDriver() is returning this error. Is it possible to get more information about this error viz. any componet of the driver having probles etc. Thanks in advance, Ashish Tag: Difference between CreateFile & Com_Open Tag: 63692
  - 20
    - printer driver crashes Acrobat Reader 7.0 Hello, my printerdriver is written from scratch, but I have looked a lot at the plotter driver from the DDK samples. My Driver initializes the structures GDIINFO, DEVINFO, DEVMODE and so on. The surface is created in "DrvEnableSurface" using functions "EngCreateDeviceBitmap((DHSURF)pPDev, SurfSize, BMF_24BPP)" and EngAssociateSurface(pPDev->hsurf, (HDEV)pPDev->hpdev, HOOK_COPYBITS | HOOK_STROKEPATH | HOOK_TEXTOUT). The driver compiles very fine and applictaions like OpenOffice, MS-Paint, WordPad and Webbrowsers assess my functions like DrvTextOut. Only "AcrobatReader 7.0" crashes if I want to print a document. The crash occures, if a accept print dialog with ok. Thx for help and please ask each question you have. Best regards AF Tag: Difference between CreateFile & Com_Open Tag: 63675
  - 21
    - Correct group for WDM development?? Just wanted to know if this was the right group to discuss Windows Driver Model (WDM) type drivers?? Particularly for Win2K? Q1: Is the book "Programming the Windows Driver Model" by Walter Oney useful? Q2: The MS Windows .Net DDK. IS that still available from Microsoft, and does anyone know the cost? I assume that's necessary?? Q3: Is Visual Studio 6 still required for the book's examples, or will VC++ 5 do? Q4: Is there another less expensive way to develop Windows drivers? Thanks, Lou. Tag: Difference between CreateFile & Com_Open Tag: 63673
  - 22
    - Windows: How to support 2 chip in a single driver? Hello, I have to write a mini-port driver which must handle 2 chip simultaneously. Is it possible? If it is, what's the difference? If no, do I have to write a filter driver to do this? Thanks. Andy Tag: Difference between CreateFile & Com_Open Tag: 63667
  - 23
    - SCSI interface. I have one problem with a printer on WinXP through SCSI port. When I turn on the printer the system find new hardware and the Windows wizard procedure search one driver for my printer device. I have not a specific driver and I have not a INF file for installation this device , because is not necessary. There is any way for disable the plug and play for SCSI devices ? How could I make a INF file for my printer device (note that I have not a device driver) ? The system identify my printer device as ( Preprocessor device ) is it wrong ? Thanks. Tag: Difference between CreateFile & Com_Open Tag: 63666
  - 24
    - Softice equivalent of WinDbg dt command Hay Does Softice have an equivalent to WinDbg's "dt" command ? Thanks. Tag: Difference between CreateFile & Com_Open Tag: 63660
  - 25
    - legacyMode Problems Hi, I am trying to use the legacyMode element within the dpinst xml schema, so that we can install non signed drivers using the Device Package Installer. However i do not seem to be bale to get it to work as it will not install the drive as it is not signed. Is there anything else that one should do to get this to work? Many Thanks, Bruce <?xml version="1.0"?> <dpinst> <language code="0x0409"> </language> <icon>App.ico</icon> <watermarkPath>AClogo.bmp</watermarkPath> <legacyMode/> </dpinst> -- Bruce Philp Software Engineer Astron Clinica Ltd Tag: Difference between CreateFile & Com_Open Tag: 63656

Hi,

For a serial port device like modem, can any one please tell me the
difference between the APIs CreateFile(), COM_Open() and HWOpen().

Thanks,

Arsalan

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Re: Difference between CreateFile & Com_Open by Paul

Paul
Fri May 27 10:53:20 CDT 2005

Well, CreateFile() is how an application program opens a hardware device (or
a file). COM_Open is the name of the driver function which is called to
perform the open, when a device whose name is of the form COM<n>: is opened.
HWOpen is probably the low-level routine that actually does whatever is
necessary to the hardware when the device is opened (called by COM_Open).

If you're developing an application, all you need is CreateFile().

Paul T.

"Arsalan Ahmad" <arsal__@hotmail.com> wrote in message
news:%23OinmFsYFHA.1028@TK2MSFTNGP10.phx.gbl...
> Hi,
>
> For a serial port device like modem, can any one please tell me the
> difference between the APIs CreateFile(), COM_Open() and HWOpen().
>
> Thanks,
>
> Arsalan
>

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