How do I create CDC object from from scratch?

Posted on 2002-06-28
Medium Priority
Last Modified: 2013-11-20

Please help me for creating a CDC object as follows.

I have a DrawGraphic(CDC* pDC) method in DLL, In which iam loading this one in a background process( executes sometimes before user logges in).
Can I build CDC object with my own values and passed to this function. This is works when I pass a compatible dc or printer dc or if create a dc like this
     CDC dispDC;
     dispDC.CreateDC("DISPLAY", NULL, NULL, NULL);

but for some reason this doesnt work when iam in back ground mode. Friends please help me how to build a CDC object with all necessary values....

Thanks in advance
Question by:pphari
LVL 23

Accepted Solution

Roshan Davis earned 800 total points
ID: 7117964
CDC dispDC;
CDC *pDC = GetDC();     // get screen dc
dispDC.CreateCompatibleDC(pDC); // make this dc compatible with screen dc
// selecting object of current screen dc to our dc
HBITMAP hBMP = CreateCompatibleBitmap(pDC->m_hDC, nWidth, nHeight);
::SelectObject(dispDC.m_hDC, hBMP);


Expert Comment

ID: 7118658
I'm not quite sure what your problem is. You are talking about users not being logged in. But what does the user have to do with your DrawGraphic()-function? I'd recommend passing a NULL-pointer to your DrawGraphic()-function if no user is logged in and you need to rely on that. I really can't imagine what you are trying to achieve, so please, give us some more information.
Btw. you should look into what a device context is. It allows homogenous access to display devices but needs to be properly initialized so that the actual painting (which is hidden from the developer) can be performed in an appropriate manner.

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