从gdi创建HBITMAP [英] Creating HBITMAP from gdi

问题描述

我正在使用gdi +执行一些基本的绘制操作，例如绘制线，圆，矩形等.

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

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

现在，我想用白色背景创建大小为(640,480)的此绘制形状的HBITMAP.

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

推荐答案

您的意思是 [ ^ ](然后您可以使用 Bitmap.GetHBITMAP [

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

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);

谢谢大家...:)

thanks guys... :)

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