Creating HBITMAP from gdi

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I am performing some basic drawing operation using gdi+ like drawing line ,circle ,rectangle etc..

C++

PAINTSTRUCT ps;
HDC         hdc;
hdc = ::BeginPaint(hWnd, &ps);
    graphics.DrawEllipse(&pen, x_start,y_start,x_current,y_current);
    EndPaint(g_hDialogWindow, &ps);

now i want to create HBITMAP of this drawn shape of size (640,480) with white background.

Posted 16-Mar-12 9:10am

pranav_30

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Nelek 16-Mar-12 15:26pm

And where are you having problems? You made no question

2 solutions

Solution 1

Do you mean "How To Draw on a Memory Bitmap in GDI+"[^] (you may then use the Bitmap.GetHBITMAP[^] to retrieve the HBITMAP).

Posted 16-Mar-12 10:27am

CPallini

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pranav_30 · Accepted Answer · 2012-03-17T01:31:00

C++

HBITMAP dcimage;
Bitmap b(800,800);
HDC hdc;
hdc = BeginPaint(g_hDialogWindow, &ps);
Graphics graphics(g_hDialogWindow);
Graphics *graphics2=Graphics::FromImage(&b);

Pen  pen(Color(255, 40,40,40),2);
SolidBrush brush(Color::White);

graphics.FillRectangle(&brush, 0, 0, 400,400);
graphics2->FillRectangle(&brush, 0, 0, 400,400);
graphics.DrawLine(&pen,0,0,600,600);
graphics2->DrawLine(&pen,0,0,400,400);
b.GetHBITMAP(Color(255,255,255),&dcimage);



 BITMAP bm;
 HDC hdcMem = CreateCompatibleDC(hdc);
 SelectObject(hdcMem, dcimage);
 GetObject(dcimage, sizeof(bm), &bm);

 BitBlt(hdc,rect.left, rect.top, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
 DeleteDC(hdcMem);

 EndPaint(g_hDialogWindow, &ps);

thanks guys... :)