VXDLDR_LoadDevice

include vxdldr.inc

mov     edx, [Devicename]
mov     eax, [Flags]
VxDcall VXDLDR_LoadDevice
jc      errorhandler

Loads a VxD into memory. Uses EAX and EDX.

Returns the address of the device-descriptor block in EAX and the device handle in EDX when the function is successful. Otherwise, it sets the carry flag and EAX contains the error code, which can be one of the following values:

Value	Meaning
VXDLDR_ERR_BAD_DEVICE_FILE	Specified VxD file is not usable.
VXDLDR_ERR_DEVICE_REFUSED	Specified device operation not allowed.
VXDLDR_ERR_DUPLICATE_DEVICE	Specified operation has already occurred for the given device.
VXDLDR_ERR_FILE_OPEN_ERROR	Unable to open specified file.
VXDLDR_ERR_FILE_READ	Unable to read specified file.
VXDLDR_ERR_IN_DOS	System error.
VXDLDR_ERR_NO_SUCH_DEVICE	Specified device not found.
VXDLDR_ERR_OUT_OF_MEMORY	Out of memory.

Devicename: Address of a null-terminated string specifying the filename of the VxD.
Flags: Indicates whether the device is initialized by the system or by the calling VxD. If this parameter is VXDLDR_INIT_DEVICE, the device is initialized by the system. Otherwise, this parameter should be zero, and the calling VxD should initialize the device and send the SYS_DYNAMIC_DEVICE_INIT message.

If you call this function without specifying the VXDLDR_INIT_DEVICE flag, you must call either the VXDLDR_DevInitSucceeded or VXDLDR_DevInitFailed service to free system resources associated with the VxD before calling VXDLDR_UnloadDevice to unload the VxD.