Create a CBitmap from a CDC ?

[jase jennings]

Hi,

I want to create a bitmap in memory from the contents of a device context held in memory, and I'm really struggling. Here's my CDC code :

		CPaintDC dc(this); // device context for painting

		m_sCaption = "Some text";

		CFont font;
		font.CreatePointFont(150, _T("Verdana"));

		CDC memDC;
		memDC.CreateCompatibleDC(&dc); 
		memDC.SetBkMode(TRANSPARENT);
		memDC.SetTextColor(RGB(0, 0, 0));
		memDC.SelectObject(&font);
		memDC.TextOut(0, 0, m_sCaption);

		CSize sz = memDC.GetTextExtent(m_sCaption);

                                // i now have my text in a device context, and i know the size of the image. 
                               // what code do i add here to copy this into a bitmap ?

Thanks

[bkenwright]

I think you should create a bitmap and select it into the dc...

e.g. BOOL CreateCompatibleBitmap(
CDC* pDC,
int nWidth,
int nHeight
);

Then use
CBitmap bitmap;
bitmap.CreateCompatableBitmap(dc, widht, height);

CDC memDC;
memDC.SelectObject(bitmap);

memDC.SetBkMode(TRANSPARENT);
memDC.SetTextColor(RGB(0, 0, 0));
memDC.SelectObject(&font);
memDC.TextOut(0, 0, m_sCaption);

CSize sz = memDC.GetTextExtent(m_sCaption);


Now if you draw on the memDC, you will be drawing on the Bitmap

[Todd.Harvey]

hey Jase,

I've been collecting everythign useful related to bitmaps in a slightly expanded BDLG sample, it might be helpful.

http://www.sayslaw.com/Thynx/C/bdlg/bdlg.htm