How to display the data in the structure 'LPVIDEOHDR' of vfw callback function?

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hello , everybody ! I've got a problem on using the VFW . It provides the callback function to deal with the frame captured by the carmera , the callback function has two parameters.
Its Function prototype :

C++

LRESULT CALLBACK FrameCallbackProc(HWND hWnd,LPVIDEOHDR lpVHdr)

but I don't know how to use the second parameter lpVHdr , I want to display the Frame info on a DC , somebody help me , thanks !

Posted 14-Jul-12 22:14pm

Younth

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barneyman · Answer 1 · 2012-07-14T22:26:00

Solution 1

the second parameter is a long pointer (LP) to a VIDEOHDR[^] struct

i.e.

if(lpVHdr->dwFlags & VHDR_KEYFRAME)
{
// it's a keyframe!
}

Posted 14-Jul-12 22:26pm

barneyman

Updated 14-Jul-12 22:28pm

v2

Comments

Younth 15-Jul-12 4:47am

thank you ! so how to display the data of its frame buffer on a DC ?

barneyman 15-Jul-12 6:05am

no idea :) example here says it's just a BMP

VFW is ancient technology - you might want to look at DirectShow

Younth 17-Jul-12 8:17am

I searched a lot ,someone said it's a no-format data of DIBS , parts info of bitmap ,but I don't know how to deal with it , could you please give me some code example ?

barneyman 17-Jul-12 20:05pm

the 5th item on that thread i pointed you at shows you how ...