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  - 1
    - Get Device Descriptor from User Mode hello all, I am facing a problem, how to det the device descriptor of USB device from User Mode, I just know VID n PID of the device. It could be great if a piece of code is availble. thanks sachin Tag: Stop Service Tag: 81758
  - 2
    - Setting DefaultInputSlot in a PPD? Hello all, I build print drivers with the PostScript OEM customization tools, and I'm stuck on some driver/PPD interaction. The second tab in DocumentProperties is normally Paper/Quality, with two drop downs for Paper Source and Media. These are populated from the PPD via InputSlot and MediaType sections. The problem is that the PPD parser (or some other component) does not honor the DefaultInputSlot and DefaultMediaType directives, and it does its own thing. I'm using the German version, and the phrase "Automatisch Auswahlen" ("Automatically Select") is filled in for us. This phrase does not appear in the PPD, but does appear in PS5UI.DLL's resource section. This all means that we're not able to set a reasonable default, and this is causing us some real problems for a customer implementation. If we change the default in the UI, it "sticks", but we don't have portable access to the DEVMODE to muck with it ourselves. Looking in the MSDN docs: http://msdn.microsoft.com/library/en-us/print_d/hh/Print_d/pscript_34563439-cd1f-4418-b51d-a3250e35df28.xml.asp It seems clear that InputSlot is being handled specially, and it suggests to me that DefaultInputSlot is simply ignored entirely. Looking at the IPrintOemDriverPS::DrvGetDriverSetting helper function, it seems that I'm able to *fetch* values, and IPrintCorePS2 lets me enumerate them, but I think I cannot find any mechanism to *set* these options. Is there any way I can set a default value for this field when the driver is installed without requiring the user to click a box after install? Thanks all, Steve -- Steve Friedl / UNIX Wizard / Microsoft MVP / www.unixwiz.net Tag: Stop Service Tag: 81755
  - 3
    - SDIO multi-block write support (WinXP SP2)? I'm developmenting a SDIO WLAN client driver in WinXP SP2. When I use SdBusSubmitRequest() to send a CMD53 with multi-block. The "Byte/Block count" field in CMD53 will be overwrite with the length of the MDL (when < 64 bytes) or 64 bytes (when > 64 bytes). Does SDBus support SDIO multi-block mode? If yes, how to program it? Tag: Stop Service Tag: 81753
  - 4
    - I2C slave device address Hi all, I am in a very strange situation for the I2C bus slave device address manipulation. Basically I have some slave devices which I communicate over the I2C bus. They work fine on different machines with Intel motherboard. The problem arises when I connect a specific slave device to the Intel 82865G machine. The address I am sending over the I2C bus for the slave device is not acknowledged by the device. The same address is acknowledged by the device on another intel machine. According to the I2C specs, the slave device is supposed to send the acknowledgement when Master finsishes sending the Bits of the address byte by pulling the SDA line low. But in this case the slave device is not pulling the SDA data line low. I have tried many cases.. like increasing the delay between the SCL , SDA check, checking the video memory, assigning the different address. But nothing is working. I am not sure whats the difference between I2C bus on one motherboard and that of another. Both are Intel 82865G. I communicate with the I2C in a driver for a graphics cards and for Intel I directly get the Video memory, convert it to the Physical memory and write to the DDC registers. I am able to send the Start condition on the I2C bus , but when I send the address of the Slave device , its not acknowledging. Other slave devices of Same type work fine. It will be very helpfull If somebody can tell me whats going on over the I2C bus for this. Thanks. -- Abhijit. Tag: Stop Service Tag: 81752
  - 5
    - How long does it take to read a usb report? I am trying to check what is the maximum speed for read/writes of my pic 18f4550 usb device. It is a full speed device and an 8 byte length report, and I am using ReadFile and WriteFile. My results are that I get about 100 read write cycles in one second. Is that a normal speed for 8 byte reports? It seems quite slow ? My C loop is tight, and my device is a loopback device, i.e. it simply copies the input to the output? Tag: Stop Service Tag: 81729
  - 6
    - sscanf Have been searching around without succes on this: Is there a recommended or 'standard' alternative to swscanf for use in a driver? (I'm wanting to parse a WSTR from the registry). Tag: Stop Service Tag: 81727
  - 7
    - Driver design interogation... Hi, I am new on driver development so my question may be stupid for guru ^_^... My driver is base on passthru NDIS from DDK, I try to develop an IP filter and HTTP-DNS content filter. I want to use SQLite to store a big list of ip and rules. I want to put this code on a service. My design question is : - Is this solution is correct ( speed, complexity,... ). - How my driver can communicate with the db service. I see some info on WMI, but I have some interrogation on performance. Thanks for your help, A++ Tag: Stop Service Tag: 81726
  - 8
    - Ndisprot problem with Intel Pro/Wireless 3945ABG Hi, I have developped an application able to control the laptop wifi adapter by setting and querying the oids OID_802_11 via the Ndisprot provided in Windows DDK 3790. This application works perfectly with the chipset Intel Pro/Wireless 2200BG and Intel Pro/Wireless 2100 and many other chipsets. The problem is that when I try to use it with the chipset Intel Pro/Wireless 3945ABG the oid OID_802_11_SSID does not work. The connection is simply not established and the IP is not retrieved. All the others oids works fine. Did you have any idea about it? Is it a known bug? Did you ever try the Ndisprot with Intel Pro/Wireless 3945ABG? I've already tried also the Ndisuio approach (using the source code of the DDK 2600.1106) obtaining exactly the same result: no connection is established when the OID_802_11_SSID is set. All the others oids works fine. Thanks Davide Tag: Stop Service Tag: 81723
  - 9
    - How to save data in Display Driver? Hello, I need to save some information(for example, data in memory buffer) in Display Driver, but i don't know how to do this.(ZwXxx Routines?) Anyone can help me please? Thanks! Tag: Stop Service Tag: 81722
  - 10
    - Network Refresh slow on S3 wake up using Keyboard key press Hi all, When a XP PC is put in the sleep mode (S3), there is no network refresh happening immediately when PC comes out of S3 by means of pressing a key on the keyboard. The network refresh happens randomly from 40 seconds to 1 minute or even more sometimes. I want to get the network refresh done as soon as the PC comes out of S3. Can anyone help me ? Sri Tag: Stop Service Tag: 81520
  - 11
    - how to reset a USB device from user mode Sometimes I experienced the device failed enumeration. I need unplug and plug back that device again. Is there any solution that my user mode application can do that for me? Given the handle to a USB hub and port number. How could I reset the device connected to that port from user mode application? I noticed there is IOCTL_USB_HUB_CYCLE_PORT defined in wxp ddk. But I cannot find any documents for that. Any suggestions? Thanks zhwqiu Tag: Stop Service Tag: 81509
  - 12
    - 1394 peripheral device identifcation (1) My driver is similar to 1394diag.sys which installs above Microsoft 1394 stack in Windows 2000/XP. This is unsigned driver. DeviceID for 1394 peripheral device is 1394\VendorName&ModelName. All my peripheral devices use same VendorName and ModelName. Still when a new peripheral device is connected, Windows 2000 and XP comes up with "New Hardware found" wizard. How can I avoid this? I donâ??t mind if I get warning "unsigned driver", but I canâ??t install driver again and again. Is driver signing required here to stop Windows prompting for driver for different EUID? DeviceId is same for all my 1394 devices and EUID is unique. What is the meaning of DeviceId if EUID is considered for DeviceId. (2) Is there any auto install method for driver to 1394 peripheral devices? I am looking for a way to have unique driver installed once for VendorName and ModelName. I know there are some topics in newsgroup. But what I dont understand is document clearly states driver for device is identified by VendorName and modelName. Documentation doesnot say driver has to be installed for every device if driver is unsigned. It only says driver installation will give "Unsigned driver" warning. So I am not sure if this is happening because driver is not signed or is it because of some other error/option in my own installation. (3) I didnâ??t see any driver signing document for peripheral drivers to 1394, found only 1394 bus drivers documentation. Thanks, Raj Tag: Stop Service Tag: 81451
  - 13
    - Modem Handles not destroyed Has anyone had issues with the USB modem handles not being closed when a device is removed? Tag: Stop Service Tag: 81447
  - 14
    - Generic Volume Surprise removal In windows 2k if you have a Mass Storage device and remove it from windows without stopping the device first you get a surprise removal message. I am able to suppress the MSD surprise removal but I cannot figure out with a filter driver how to remove the Generic Volume message Can anyone help? Dan Tag: Stop Service Tag: 81437
  - 15
    - Bluetooth HCI Ioctls Is there any documentation that can help me find out how to communicate with the Dell TrueMobile Bluetooth module? I need to send HCI commands to the Bluetooth module. Is there a sample in either the SDK or DDK? Tag: Stop Service Tag: 81436
  - 16
    - WHQL, HCT, WHDC, Windows Logo, Driver signing WHQL, HCT, WHDC, Windows Logo, designed for windows, Driver signing.....are these all same. Is windows logo requirement and driver signing are same? I am not able to find how to get my driver signed. This is 1394 driver for peripheral device. This driver is on top of Microsoft 1394 stack and is designed in the lines of 1394diag.sys. All I can find is 1394 bus driver or 1394 hardware. I cant see any mention of 1394 peripheral driver. I dont understand why 1394 peripheral link is not even refered from 1394 bus driver. Someone please refer the link. After Microsft arm twisted me into driver signing with otherwise crappy driver installation, I dont find proper information on this. Thanks. Tag: Stop Service Tag: 81429
  - 17
    - MmMapIoSpace what exactly it does? MmMapIoSpace This function maps the specified physical address range to nonpaged process-dependent address space, providing a directly mapped virtual address to the device. Internally what exactly happens behing this API call. How does translation of address occurs?? suppose i have address dedicated for LCD controller or any other peripheral. In my driver i call MmMapIoSpace to access the device.. How will the processor know this address is meant for that particular device?? Or how does transaltion of address happens? Any suggestion is appreciated. Thanks Vijay PIC ,Bangalore Tag: Stop Service Tag: 81423
  - 18
    - Conflicting errors code with USB Bulk requests When our USB function driver is used in a loop or for a long transfer of data (MBs)on a Bulk endpoint, after a short period of time the I/O status (IRP) returns a failure but the URB status is successful. This is after hundreds of successful requests. The IRP errors have been STATUS_IO_DEVICE_ERROR or STATUS_IO_TIMEOUT. The URB status is USBD_STATUS_SUCCESS in either case. In what conditions would the Windows USB stack return these errors and the URB be successful? Second question, when testing for IRP error codes from a IOCTL_INTERNAL_USB_SUBMIT_URB request, which I/O status should be tested? IO_STATUS_BLOCK ioStatus = { 0, 0 }; PIRP irp = IoBuildDeviceIoControlRequest(...., &ioStatus); // Boilerplate code... ntStatus = IoCallDriver(pdx->lowerDeviceObject, irp); if (ntStatus == STATUS_PENDING) // Wait on event At this point is io.Status.Status == irp->IoStatus.Status ???? If not, which is the proper method?? Thanks, SteveB, MCSD Welch Allyn, Inc. Tag: Stop Service Tag: 81400
  - 19
    - best source address (TDI) Hello, I want to find the best source address for a given destination address in a TCP TDI filter, and bind the connection endpoint to that source address. How can I do this in TDI? Thanks, Piyush PS: Is this the right list for this question? Tag: Stop Service Tag: 81026
  - 20
    - ZwQueryInformationFile Hello I'm using ZwQueryInformationFile to retreive a file name from a file handle. So i use the FileNameInformation class. Unfortunately the filename always begins with / (for example /Windows). My question is: how am i supposed to make a difference between C:\Windows and D:\Windows? Tag: Stop Service Tag: 81022
  - 21
    - How to create a dynamic pin in video cap driver helle, everyone I'm an newbie in windows wdm driver development, i want to develop a video capture driver based testcap, can dynamic create a pin, meas when i connect the filter in graphedt, i hope i can dynamic create a new pin and dynamic delete the pin at the time of break connect like splitCam( [url]http://www.splitCamera.com[/url]). I think that is a very cool function. Can you tell me how I can get this function? Can you list some documents help me. Thank you very much for your time and consideration! -- wintop ------------------------------------------------------------------------ Posted via http://www.codecomments.com ------------------------------------------------------------------------ Tag: Stop Service Tag: 81020
  - 22
    - [Off-Topic] WDF Books & W.Oney ? I've searched and found only OSR Publication's KMDF book , do you know any other books for WDF (except MSDN Resources) , and any news from Walter Oney about a new book project ? Tag: Stop Service Tag: 81018
  - 23
    - Does the stream device have the recived/send buffer?If yes,where does it define? Hi All, When I write the MC8051 program,there is buffer to recive or send the date in the UART communication.And if there is date recived we can read the buffer directly instead of reading the bit one by one according to the timing graph. However,Does the WinCE driver program have the same mechanism as MC8051? If yes ,generally where is the buffer defined?Is it a register? For example,the driver of the AC97 ,...\WINCE420\PUBLIC\COMMON\OAK\DRIVERS\WAVEDEV\UNIFIED\ENSONIQ\ How does the chip read the media file and render?Is it one bit by one bit,or read the buffer? Thanks, Peter Tag: Stop Service Tag: 81014
  - 24
    - TDI Client vs Winsock A few questions on TDI clients that someone may be able to answer: 1. In general, should there be appreciable differences in TDI client vs. Winsock throughput and latency over LAN or wireless links? 2. Does Winsock implement SO_SNDBUF/SO_RECVBUF sizes in afd.sys or in other components? That is does a TDI Client have to reimplement buffering or is it just an option passed to tcpip.sys (like TCP_NODELAY). 3. Can TDI clients issue more than 1 send irp at once? How would that affect throughput/fairness? Thanks. Tag: Stop Service Tag: 81013
  - 25
    - page marked as read-only Hi all, is there any way to mark a piece of data as read-only? This data is previously allocated with ExAllocatePool. The purpose would be to generate a bugcheck when something tries to write unexpectedly to that part of data. Best regards, Calin Tag: Stop Service Tag: 81009
- Next
  - 1
    - page marked as read-only Hi all, is there any way to mark a piece of data as read-only? this data is previously allocated with ExAllocatePool. the purpose would be to provoque a bugcheck when something tries to write unexpectedly to that part of data. Best regards, Calin Tag: Stop Service Tag: 81008
  - 2
    - windows vista Good Morning, I've installed Windows Vista Beta 2 Build 5384, now I've got a scanner (hp 4300 C) doesn't run because I'haven't got the drivers for windows Vista Help me Thanks Claudio Tag: Stop Service Tag: 81000
  - 3
    - KMDF Build Environments Hi, I'm using the Windows Server 2003 SP1 DDK with KMDF v1.1. I understand that KMDF v1.1 drivers are compatible with Windows 2000, XP, and Server 2003... So what difference does it make if I build my kmdf driver with the Win2000, WinXP, or Win2003 build environment? George Tag: Stop Service Tag: 80993
  - 4
    - where to start for driver install I know there is devcon sample in DDK. This is kind of C program. But how to use it with some user friendly wizard like installation application. How to combine this C code with installation application. Is there any installation application coming with Windows. I have MSDN professional subscription. I can buy other install packages as well. I need to make a install program for a PNP driver (1394 driver). I am also planning to get this signed. This driver works with Windows 2000 and above. Thanks, Raj Tag: Stop Service Tag: 80987
  - 5
    - Help for printer driver developer Hi guys! I need to create a printer driver to obtain a TIFF file. I'm reading for the second time the Microsoft DDK but it's very difficult. Does someone has a document that shows this matter? My problem is to understand what I need to develop: a port monitor? a driver? a printer graphics? Can someone help me to start? Thank you very much. Roberto Tag: Stop Service Tag: 80985
  - 6
    - Please tell me do i have a Win32 API which captures capture WinXp DDK DbgPrint messeges Hi all, Is there a Win32 API which captures WinXp DDK DbgPrint messeges. I mean i wanted to capture those messeges without using a standard debugger... Can anybody help me for this, Thanks and Regards, Rohit Tag: Stop Service Tag: 80984
  - 7
    - I2C lines and video drivers Is there any way to write a filter driver to take control of the I2C lines on a video card? I know the video miniport owns these functions but is there an API for general access? Tag: Stop Service Tag: 80983
  - 8
    - source code for pen drive driver on windows platform Hi all, I need the source code of pen drive driver for windows. from where can I get it? Tag: Stop Service Tag: 80975
  - 9
    - Building a device driver non interactively Hi, Our system build has 600 components all in VC++ that are build non interactively( without human intervention) using script files running omake - OPTIONS xx.mak. Adding a windows device driver is posing problem because after the call to setenv.bat , the batch file stops executing and doesnt process commands like "build sources". Has anyone attempted a non intewractive build mechanism. Your help is very much appreciated. Thanks Ashish Tag: Stop Service Tag: 80965
  - 10
    - Vista frame buffer driver Hi All, I have frame buffer driver works fine for WinXP. I test it under Vista Beat 2 build 5384 and it won't work (error code 43). Does Vista support frame buffer driver? I couldn't find frame buffer driver sample code in WDK build 5384. Does that mean no frame buffer driver support under Vista? hyang Tag: Stop Service Tag: 80964
  - 11
    - Vist frame buffer driver Hi All, I have frame buffer driver works fine for WinXP. I test it under Vista Beat 2 build 5384 and it won't work (error code 43). Does Vista support frame buffer driver? I couldn't find frame buffer driver sample code in WDK build 5384. Does that mean no frame buffer driver support under Vista? hyang Tag: Stop Service Tag: 80963
  - 12
    - TCP KeepAlive via TDI Hi, Anyone know how to turn on TCP KeepAlive via TDI. Also, the default value is 7200000 milliseconds. Is there anyway to change this via TDI. Thanks, -David G Tag: Stop Service Tag: 80953
  - 13
    - 32-bit app IOCTL_SCSI_PASS_THROUGH on x64 Windows ==> Error 1306 Every time I use IOCTL_SCSI_PASS_THROUGH on a tape device from a 32-bit app on x64 Windows, the RC = 1306. The same 32-bit app on Windows 32-bit works, as does a 64-bit app on x64 Windows. Is there a way to support passthrough on an x64 OS from a 32-bit app? I observed this behavior after a 32-bit compile of spti from the DDK. Thanks in advance. -- Tape Device Driver Development IBM Tucson Tag: Stop Service Tag: 80948
  - 14
    - Mux compile problem. When I compile Mux driver under Windows XP Free Build Environment, I got error below and don't know how to fix it. Can someone please help? C:\Mux1n3>build -w BUILD: Adding /Y to COPYCMD so xcopy ops won't hang. BUILD: Object root set to: ==> objfre_wxp_x86 BUILD: Compile and Link for i386 BUILD: Loading C:\WINDDK\3790~1.183\build.dat... BUILD: Computing Include file dependencies: BUILD: Examining c:\mux1n3 directory for files to compile. BUILD: Linking c:\mux1n3 directory Linking Executable - objfre_wxp_x86\i386\mux1n.sys for i386 protocol.obj : warning LNK4006: _OidToString@4 already defined in mux.obj; secon d definition ignored errors in directory c:\mux1n3 LINK : error LNK1218: warning treated as error; no output file generated BUILD: Done 1 executable built - 1 Warning - 1 Error C:\Mux1n3> Tag: Stop Service Tag: 80944
  - 15
    - MDL's I have a driver that receves a buffer from another kernel mode component it may also receive a MDL (that corresponds to that kernel buffer), that mdl may or may not be locked. If it does not receive a mdl I do an IoAllocateMdl on the buffer then I want to check if the mdl is locked. So I check the mdl->flags for MDL_PAGES_LOCKED if not I do a MmBuildMdlForNonPagedPool Does that lock the buffer/mdl? I do not afterwards see the MDL_PAGES_LOCKED flag set in mdl->flags Do I need the MmProbeAndLock, I thought that was only (or primarily) for buffers from user mode. thanks also after this mdl is locked ok/recommended/ not recommended to do a MmGetMdlPfnArray() to know what how to program some device. if that device uses 64 bit address registers do I, zero the top 32 bits, or is it recommended to use one of the Adapter->ScatterfGather type funcs ? Tag: Stop Service Tag: 80942
  - 16
    - How to inhibit Auto Run/Play in XP Hello, We are trying to inhibit any reaction when a USB device is plugged in or a removable media device is activated. The system should not execute any program, nor dispaly any message. We would like to make the change automatically through our application, but working through a user interface would be acceptable. We have tried changing the Registry key "NoDriveTypeAutoRun" to 0xFF, as well as selecting "Take No Action" when the autorun window comes up, but nothing seems to inhibit the reaction. Creating an Autorun.inf file that points to a dummy exe file also has not helped. What is left? What are we doing wrong? Thanks in advance for any help. Best regards, Garet Cammer Tag: Stop Service Tag: 80940
  - 17
    - Confused : Target Platforms,WDM & WDF ... First of all , i 'm a newbie and i hope you bear me ... 1. what are major and minor differences between win2000 ddk and xp sp1 ddk except target platforms ? For example , i read that XP is a super-set of Windows2000 , but what are extra features of XP and XP device drivers comparing to 2000 and 2000 device drivers? 2. What is the role of WDF ? Can i write stable 2000/XP drivers using WDK and can 2000/xp drivers written in WDK run in Vista ? 3. Why are KMDF and UMDF seperated in WDF ? Tag: Stop Service Tag: 80927
  - 18
    - need advice hi, I'm very new to driver programming, Which books or resourses should I read for windows driver programming at the beginning thanks Tag: Stop Service Tag: 80923
  - 19
    - The way for a 3D game to retrieve the position of mouse? Are there some special way we seldom use for the 3D games to retrieve the position of the mouse? I know the Underground1 use the DirectInput8 to retrieve the data of mouse and keyboard(GetDeviceData() for the keyboard,and GetDeviceState() for the mouse) , the Underground2 use the the DirectInput8 to retrieve the data of keyboard and the click of mouse (GetDeviceData() for the keyboard,and GetDeviceState() for the mouse) .But what is the way the Underground2 used to retrieve the mouse's position? Tag: Stop Service Tag: 80922
  - 20
    - shift key status hi friends i am working on UNIDRV printer driver, platform win 2000. i am trying to get the status of shift key. for this purpose i am using window api GetKeyState(). Actually i want to skip printing if user give print command with shift key down. i am calling this function in DllMain() function as shown below long vk_shift=0x10; long keystatus = (GetKeyState(vk_shift) & 0xF0000000); if(keystatus) { checkfile=fopen("c:\\shiftfile.txt","w"); if(checkfile) { fprintf(checkfile,"%c",'s'); fclose(checkfile); } } This code works fine with all applications except MS-WORD. So i want to know what is the problem with MS-WORD. if you are not able to get the problem then let me know. regards Himanshu Tag: Stop Service Tag: 80920
  - 21
    - shift key status hi friends i am working on UNIDRV printer driver, platform win 2000. i am trying to get the status of shift key. for this purpose i am using window api GetKeyState(). Actually i want to skip printing if user give print command with shift key down. i am calling this function in DllMain() function as shown below long vk_shift=0x10; long keystatus = (GetKeyState(vk_shift) & 0xF0000000); if(keystatus) { checkfile=fopen("c:\\shiftfile.txt","w"); if(checkfile) { fprintf(checkfile,"%c",'s'); fclose(checkfile); } } This code works fine with all applications except MS-WORD. So i want to know what is the problem with MS-WORD. if you are not able to get the problem then let me know. regards Himanshu Tag: Stop Service Tag: 80919
  - 22
    - getjob() function hi friends i am working on UNIDRV printer driver, platform win 2000. i am calling getjob() function in OEMStartDoc function as shown below. GetJob(pdevobj->hPrinter,jobid,(DWORD)1,pJob,cbBuf,&pcbNeeded) initially i call this function with cbBuf =0 and after calling this function i copy the value of pcbNeeded in cbBuf and again call this function with new value of cbBuf. now what's the problem is this function works fine with all applications except MS-WORD. in case of MS-WORD i get the value of pcbNeeded =0 after first call but in rest of the cases i get some value in pcbNeeded. Actually i am trying to get the name of printer with the help of JOB_INFO_1 structure. Now i want to know what is the problem with MS-WORD. regards Himanshu Tag: Stop Service Tag: 80918
  - 23
    - how to dev virtual webcam use DDK hi all, i have see src\wdm\avstream\avshws of DDK and i want use it to dev 1 virtual webcam, step one, i change something on source code to when install into my system it display at: Video Capture Sources and WDM Streaming Capture Devices tree too, but can not, pls anybody help me how to change code to when install driver it display both two??? Thanks very much David, Tag: Stop Service Tag: 80916
  - 24
    - rs232 to usb2 converter problem I have an problem with the application I am currently developing and I will be very pleased if you can help. Here it is: 1 ) I have developed an MFC dialog based application using rs232 protocol to communicate with an hardware. 2 ) There is no problem with the communication with the following settings, port = com1, baud rate=115200, 8n1, no flow control. 3) When I insert a rs232 to usb2.0 converter between the hardware and the usb port (hence a virtual com port is created), a significant reduce in the data transfer rate is observed although the baud rate is set at 115200bps in my application. 4) But the data transfer rate reduction is not observed when I use hyperterminal. My question is: What Is the different handling mechanism implemented in hyperterminal when USB device is detected? Are there different API calls? My application uses createfile function to open the port (for both real COM ports and virtual com ports using usb2 to rs232 converter) . And use the same routines as if I am on a com port? Should I do something else? I will be very pleased if you can help... Thanks again... Ugras Tag: Stop Service Tag: 80914
  - 25
    - How many pixels of a webcam? Hi all, If a webcam says it can capture 1.3MP still image and live preview at 640*480 resolution, is there a way I can know how may pixels the webcam actual supports(not interpolated)? I mean via driver or application, is there any programming interface to get the info? Thanks in advance. Tag: Stop Service Tag: 80913

Experts!
I have a device conected to my computer with a USB,
i want to stop this device and then start it again.
i selected disable in the device manager and the device was disable
successfully.

But when i tried to do it programmaticatly it failed.
I tried calling "net stop service_name_blabla" from the command line.
and i tried using SERVICE_CONTROL_STOP,in ControlService

but they both failed, reason:
"The requested control is not valid for this service. " error
how can i disable the service with C++ like i'm doing well in the device
manager ?

thanks.

RE: Stop Service by pavel_a

pavel_a
Mon Jun 19 04:34:01 CDT 2006

"Bombadill" wrote:
.....
> I tried calling "net stop service_name_blabla" from the command line.
> and i tried using SERVICE_CONTROL_STOP,in ControlService
>
> but they both failed, reason:
> "The requested control is not valid for this service. " error
> how can i disable the service with C++ like i'm doing well in the device
> manager ?

Driver is not a normal service, so you can't stop it with ControlService.
Use SetupDi... API. See the "devcon" sample in DDK for this.

Regards,
--PA

Re: Stop Service by Maxim

Maxim
Mon Jun 19 14:06:20 CDT 2006

> But when i tried to do it programmaticatly it failed.
> I tried calling "net stop service_name_blabla" from the command line.
> and i tried using SERVICE_CONTROL_STOP,in ControlService

Not correct way. See DEVCON source for a correct way, which is the same as
"Disable" in Device Manager - SetupDiCallClassInstaller with proper function
code.

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