Device Drivers

usbser.sys throughput problem
Dear All, I'm currently working on a CDC device. The device is identified as a virtual serial port in windows and is using usbser.sys, moreover the device is identified as Full-Speed. When my device sends data to PC via its dedicated endpoint, I can reach a throughput around 300kbps, however when PC sends data... 13 Dec 2006 01:24

Printer driver samples
Using the OEMDLL Bitmap sample, the FilterGraphics method isn't being called. To reproduce, build the Bitmap sample in the 5744 WDK (make sure you add the debug define to sources), install the driver and print a test page. I see several ImageProcessing calls, but no FilterGraphics. What could cause FilterGrap... 10 Dec 2006 20:57

SplPromptUIInUsersSession
Hello, My Win2K/XP UNIDRV-based printer driver has a feature to allow "pausing" (via a MessageBox) the spooler at the beginning of each PAGE of a document. This is needed to allow a user to tear off EACH page when using roll paper. I was able to get this to work for 2K/XP by using the OEMDLL for OEMUNI sample ... 7 Dec 2006 17:44

play sound from kernelmode
Hello, i've to play a simple sound out of a driver. I read a while in the DDK and found, that the stream api ( KS.. ) is more complicated, than i thoght ;-(. I've to send simple 'beeps' via the sound card, as there is no buzzer connected. I've to do this in kernelmode, as the beeps have to be generated also w... 7 Dec 2006 10:37

EHCI driver causes blue csreen
I read a data stream from a device with a high speed bulk endpoint. Data rate is 10 MByte/s. I use 4 buffers with 64kbytes of size, overlapped. Buffer is passed as MDL. This is in the limit recommented by the paper: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q832430 The blue screen occurs rarely ... 13 Dec 2006 04:37

kbfiltr sample and Windows Vista...
Hi, I came across the same issue with the samples, but discovered running kbftest.exe as elevated does work on vista. I'm now trying to find out if this can be modified to run without elevation. Mike "L Adams" wrote: I have been using a modified version of the kbfiltr DDK example that I have been... 5 Dec 2006 15:23

kbfiltr \ kbftest requires elevvation?
Hi, In sample for Kmdf\kbFiltr & Kmdf\kbtest elevation is required on vista in order for the demo to work. Why is this and is there a way to get it to work without elevation? I'm writting an application that runs as the current user and the application needs to communicate with the driver. Thanks, Mik... 6 Dec 2006 17:39

WSD port name and IPBusEnumRoot mapping
Hi, Our multfunctional device supports DPWS. We are able to install our GDI based drivers through WSDPrint. We have some functionalities which requires the SNMP communication to be done to get the Printer status etc. For this we need to get the IP address of the system. Unfortunately from the Port name we ... 4 Dec 2006 01:06

kmdf port
Hi, I'm new to driver development, and having some problems. I wrote my first driver using the ddk and by following the sysinternals ctrl2cap example. I'm now trying to figure out how to wire up the kmdf\kbFiltr example to call the KbFilter_ServiceCallback method so I see some prints in the debuger, and th... 5 Dec 2006 15:23

IoReadPartitionTableEx() on Windows Vista
I have a question about IoReadPartitionTableEx() on Vista. I call this routine in my filter driver which is a disk class upper filter. But it always returns error 0xC0000002, STATUS_NOT_IMPLEMENTED. I even manually created my own IRPs for IOCTL_DISK_GET_PARTITION_INFO IOCTL_DISK_GET_DRIVE_LAYOUT IOCTL_DISK_... 30 Nov 2006 17:30