Device Drivers

KsCreateDevice fails when parent driver is USBHUB on Windows 2000
My device is USB composite device. Parent driver is USBHUB on Win2000. KsCreateDevice() is called from our BDA driver AddDevice() handler. On Windows 2000, if optional 3rd parameter Descriptor is NULL, KsCreateDevice returns STATUS_SUCCESS. But if DeviceDescriptor points to our KSDEVICE_DESCRIPTOR structure, it f... 31 Mar 2008 07:21

Smartcardreader driver -> Ifdtest returns: VendorName is NULL
If i run the hct tool Ifdest.exe on my virtual smartcardreader driver I get only the following error and ifdest returns immediately. "VendorName of reader device \\?\ROOT#SMARTCARDREADER#0000#{50dd5230-ba8a-11d1-bf 5d-0000f805f530} is NULL" This looks like a simple error, but I see no failure in the driver. ... 31 Mar 2008 14:05

HID devices on COM
Hello experts, I'm new to HID. I'm trying to build an application to communicate with a touch board. That board communicates through HID protocol/ specification. Board can be connected on USB and COM port. I'd like to know if I can use the HidP_* & and HidD_* API to communicate with board if it is connected on COM... 3 Apr 2008 02:23

Rescan disks doesn't rescan disks?
In Windows XP SP2, Computer Administration -> Disk Administration, Action -> Rescan Disks seems to be inconsistent as to whether it rescans disks or not. If I get permission from Windows to detach a USB hard drive, then actually detach it and reattach it, then Action -> Rescan Disks rescans the disk. But if I ... 1 Apr 2008 03:17

Multiple IP's with single NIC and multiple VLANS
Hi, I need your help in providing multiple IP addresses with a single NIC. The IP addresses should be obtained dynamically (DHCP) but they would be obtained from different networks, e.g. two VLANs. How should I do this? Should I create two instances of the same miniport driver? Or my driver should be abl... 3 Apr 2008 01:50

problem punting in GDI
I've been given a unfinished printer driver to try to fix, unfortunately I've never worked on a driver, GDI, or windows before. In a call to DrvBitBlt, the Dest surface is my device managed surface, the source surface contains the correct image (in this case a piece of text from a pdf that is been sent as an im... 1 Apr 2008 01:06

BPB_HiddSec
In a Partition Boot Record for a FAT partition, the BPB_HiddSec field is supposed to be a count of hidden sectors located just prior to the sector containing the PBR itself. For the first partition on the drive, is this count supposed to include the MBR? Supposedly the exact answer is operating system specifi... 2 Apr 2008 18:32

Slow WMA Audio Driver
I have used the Simple WMA Audio driver sample/example from the 2003 DDK to create a working audio device driver. My issue is that it seems to not get full-speed PCM audio sent to it. The driver example uses the DMA CopyTo() call to capture the audio that was going to be put into a DMA buffer, and instead it ... 31 Mar 2008 00:17

Who stole Who and Who copy Who, what is question
Ok Who Stole Who and Who copy Who , in fact Microsoft was stolen many function of windows to concurent systems too, since 1984 for example Apple for interface, Mozilla for IE, Pen recogniton system, Doubledisk System for diskdoubler in XP. After they lock this idea with trademark or copyright. The Mast... 30 Mar 2008 04:37

What could be explaining a 10 ms DPC latency?
I have a DPC that is scheduled to be invoked by a timer every 20 ms. That DPC is responsible for simply fetching an IRP from a cancel-safe- queue, do an operation that takes **less than a microsecond**, then completing the IRP. Using high-resolution measurements (WPP etc.) the time it takes from the moment the... 3 Apr 2008 10:01