Thank you for your response!
I want to access video memory througth video0.
Because video port driver creates \devcice\videoN with exclusive flag set.
What do you want to accomplish by access video DO?
Calvin Guan Software Engineer
ATI Technologies Inc. www.ati.com-----Original Message-----
From: f [mailto:xxxxx@eyou.com]
Sent: November 24, 2004 8:36 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] Why I cannot open “Display1” ?Hi ,Everyone.
I just take a test to open the video device “Display1” and to get a
File_Object for accessing the video buffer . Code I used :PFILE_OBJECT VideoTest_OpenDisplayDevice(ULONG DisplayNumber)
{
WCHAR DeviceNameBuffer[40];
UNICODE_STRING DeviceName;
NTSTATUS Status;
PFILE_OBJECT VideoFileObject;
PDEVICE_OBJECT DeviceObject;swprintf(DeviceNameBuffer, L"\Device\Video%d", DisplayNumber);
RtlInitUnicodeString(&DeviceName, DeviceNameBuffer);Status=IoGetDeviceObjectPointer(
&DeviceName,
FILE_READ_ATTRIBUTES,//FILE_ALL_ACCESS ,
&VideoFileObject,
& DeviceObject
);if (!NT_SUCCESS(Status))
{
DbgPrint(“Status=0x%x\n”,(ULONG)Status);
return(NULL);
}return VideoFileObject;
}The result is NULL, Status=0xc0000022,it means “STATUS_ACCESS_DENIED”.
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Questions? First check the Kernel Driver FAQ at
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