Device Drivers

disk.sys/partmgr.sys
When I use the device manager to look at drivers for my western digital disk drive listed under disk drives I see that it uses disk.sys and partmgr.sys. My questions are: 1. I assume that disk.sys is the class driver. If I use the DDK tool devicetree I can see that it is sitting on top of partmgr.sys. Is the ... 31 Jan 2009 18:44

IoGetDeviceProperty returns STATUS_OBJECT_NAME_NOT_FOUND
I try to get the DevicePropertyClassName with the above API in my add device routine. I get STATUS_OBJECT_NAME_NOT_FOUND randomly. sometimes my API gets succeeded and sometimes it fails. Can anybody tell me why this random behaviour. But when I query DevicePropertyClassGuid immediately after the above failure... 30 Jan 2009 03:59

HID mini - Touchscreen not behaving properly
I have written a HID mini driver for touchscreen (My touch screen device is a non-Hid class input device, I mean i have a custom mechanism for reading the device). I have used the vhidmini sample but have changed the input report.I have registered with the HID class driver with the touch report as below - (... 1 Feb 2009 23:59

Windows 7 WDK Mirror Driver Question
Hi All, I'm quite new to C/C++ let alone driver writing. I've writtin some apps in Delphi, but when it comes to screen capturing then delphi just doesn't cut it. I've received a Windows 7 Beta key with WDK, WLK and SDK. I've succesfully build the mirror driver sample. The Installation wouldn't go first time, ... 2 Feb 2009 22:03

USB transfer not working after 6 incomplete IN transactions
Hello, I am working on a USB device and a PC application to communicate to the device. I have one OUT end point and one IN endpoint on my device. I am continuously reading data on the IN endpoint in a separate thread inside my application. My application connects to the device using CreateFile function, and ... 10 Feb 2009 02:25

ksdebug.h and _DbgPrintF
Hi, can anyone give me a hint on how to make _DbgPrintF in ksdebug.h print out messages on Vista? I'm using DebugView to capture kernel messages. With my own macro #define DebugPrint(_x_) \ DbgPrint("MYDRIVER.SYS: ");\ DbgPrint _x_; I get debug messages. But not from code t... 31 Jan 2009 11:24

EngMapFile vs. CreateFileMapping - filename differences
Hello, with CreateFileMapping() it is possible to map a file that is not represented in the filesystem (like c:\file.dat) by specifying INVALID_HANDLE_VALUE for the file handle and then an arbitrary filename can be chosen (like "Global\myfile"). Now I am not sure if this is possible in a display driver when... 28 Jan 2009 02:54

Bugcheck 101
Hi, Stefan, Sorry for the delay in answering! We haven't totally characterized the speed of the Vp2000 yet, however, a 4-node Vp2000 with 4Gb of memory can spin a 512x512x512 16-bit CT dataset at 20 frames per second. Actually, the AquariusNet application has a 3D viewer that's awesome to use, you see real 3... 4 Feb 2009 19:05

Sound card C-media 6501 on windows 7
I can not find any drivers to work on this onboard sound card. Should i just buy a sound card since i can't find any drivers ? if so what sound cards are working with windows 7? The only problem i am having is the mic won't work, it is using a generic usb sound driver Any help would be appreciated ... 20 Jan 2009 08:27

Get physical addresses from a user-mode pointer
Hello, Within a driver, is there a way to recover the physical addresses of memory pages that are behind a user-mode buffer pointer given via an IOCTL, as an example? Thanks, Olivier ... 22 Jan 2009 10:47