PVIDEO_PORT_GET_PROC_ADDRESS callback function (video.h)
The VideoPortGetProcAddress callback routine retrieves the address of a Windows 2000 or later video port driver function.
Syntax
PVIDEO_PORT_GET_PROC_ADDRESS PvideoPortGetProcAddress;
PVOID PvideoPortGetProcAddress(
[in] IN PVOID HwDeviceExtension,
[in] IN PUCHAR FunctionName
)
{...}
Parameters
[in] HwDeviceExtension
Pointer to the miniport driver's hardware device extension.
[in] FunctionName
Pointer to a null-terminated ASCII string that contains the name of the function being searched for.
Return value
VideoPortGetProcAddress returns a pointer to the function specified in the FunctionName parameter, if it exists. If that function does not exist, this function returns NULL.
Remarks
VideoPortGetProcAddress makes it possible for a video miniport driver to gain access to video port driver functions without linking to them directly. This enables a miniport driver to take full advantage of Windows 2000 and later features but still be able to load on earlier NT-based operating system versions. For an example of how to use VideoPortGetProcAddress, see Using VideoPortGetProcAddress.
The VideoPortGetProcAddress member of the VIDEO_PORT_CONFIG_INFO structure contains the address of this callback routine.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| IRQL | PASSIVE_LEVEL |