How to get background

[Yoh-hei]

Hello:
I use bitblt() copy a bitmap to screen.But I need
the background of bitmap.(it's said all graphic keep up
when bitmap move on it.)
any advice!Thank you!

[Santhosh Cheeran]

Is this the question, you have to keep the background while bitblt, try this and let me know

// transfer non-gray pixels to the screen
if (GetDeviceCaps(hdc, CAPS1) & C1_TRANSPARENT){
SetBkMode(hdc, NEWTRANSPARENT); SetBkColor(hdc, RGB(0xc0,0xc0,0xc0));
BitBlt(hdc, x, y, cx, cy, hdcButton, 0, 0, SRCCOPY);}

[Yoh-hei]

Hello:
I had test the code.I use VC++6.0 MFC ScrollView
Class.But when I run the code.There are three error
"CAPS1,C1_TRANSPARENT,NEWTRANSPARENT"Undefined.The
code add to mouse Message function.I defined "CDC*
pDC=GetDC()"on top.
I don't know how to do again?Please help me?Thank you
Yoh-Hei