IMFPMediaPlayer::UpdateVideo method (mfplay.h)
[The feature associated with this page, MFPlay, is a legacy feature. It has been superseded by MediaPlayer and IMFMediaEngine. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer and IMFMediaEngine instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Updates the video frame.
Syntax
HRESULT UpdateVideo();
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
The current media item does not contain video. |
|
The object's Shutdown method was called. |
Remarks
Call this method when your application's video playback window receives either a WM_PAINT or WM_SIZE message. This method performs two functions:
- Ensures that the video frame is repainted while playback is paused or stopped.
- Adjusts the displayed video to match the current size of the video window.
Important Call the GDI BeginPaint function before calling UpdateVideo.
Examples
IMFPMediaPlayer *g_pPlayer;
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
switch (uMsg)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
if (g_pPlayer)
{
g_pPlayer->UpdateVideo();
}
EndPaint(hwnd, &ps);
break;
case WM_SIZE:
hdc = BeginPaint(hwnd, &ps);
if (g_pPlayer)
{
g_pPlayer->UpdateVideo();
}
EndPaint(hwnd, &ps);
break;
// other messages
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 7 [desktop apps only] |
| Minimum supported server | Windows Server 2008 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | mfplay.h |