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

See also

VIDEO_PORT_CONFIG_INFO