VxD

I have a VxD already created and I have a C++ application already created. How do I use the VxD inside the C++ application. I can't rebuild the VxD because I don't have the code for it. What do I do???????

[Natali Levit]

To open VxD handle :
hKernel32Dll = LoadLibrary( "kernel32.dll" );
if( !hKernel32Dll )
{
Application->MessageBox("Cannot load Kernell32.dll event"," Error" ,MB_OK|MB_ICONSTOP);
return 0;
}
pfOpenVxDHandle = ( HANDLE ( WINAPI* ) (HANDLE )) GetProcAddress( hKernel32Dll, "OpenVxDHandle" );
if( !pfOpenVxDHandle )
{
Application->MessageBox("Cannot Get Address of pfOpenVxDHandle ","Mardll Error" ,MB_OK|MB_ICONSTOP);
return 0;
}
hDevice = CreateFile(VxDName, 0, 0 , 0, CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, 0);
if (hDevice == INVALID_HANDLE_VALUE)
{
char serr[256];
err = GetLastError();
sprintf(serr, "Cannot load VxD, error=%08lx\n", err );
Application->MessageBox(serr,"Error" ,MB_OK|MB_ICONSTOP) return 0;
}
FreeLibrary(hKernel32Dll);
To call VxD procedure something like
Success = DeviceIoControl(hDevice,
IOCTL_GPD_SEND_BUF_WIN32, // Handle to device
NULL, // Buffer from driver.
0, // Length of buffer in bytes.
sig+, // Buffer to driver.
bSize, // Length of buffer in bytes.
&ReturnedLength, // Bytes placed in DataBuffer.
NULL // NULL means wait till op. completes.
);

and
CloseHandle(hDevice);
at end

[Surinder]

Can you please suggest me some books or Internet sites from where I can get started with writing VXDs for windows ?
Actually I want to access the System Timer 8253 at the rate of 44Khz or more & trap system H/w interrupts.

Thanx
Surinder

ICQ #3760 3760

[Andy St.Clair]

Hi,
With regard to VxD books I have found the following to be useful:

Writing Windows VxD's and Device Drivers - by Karen Hazzah
System programming for Windows95 - by Walter Oney

Try http://www.amazon.com the book people for more titles.

The following sites may be useful:

http://www.vireo.com/vireo.htm
http://www.chsw.com/ddk/