c++ - C++ windows位图绘制文本

Question

如何在图像上绘制文本（设置字体和大小）并将其保存为 JPEG？

例如

    CBitmap bitmap;
    bitmap.CreateBitmap(width, height, 1, 32, rgbData);

在这里，我想在位图上绘制一些文字：

    CImage image;
    image.Attach(bitmap);

    image.Save(_T("C:\\test.bmp"), Gdiplus::ImageFormatJPEG);

Answer 1

CBitmap bitmap;
CBitmap *pOldBmp;
CDC MemDC;

CDC *pDC = GetDC();
MemDC.CreateCompatibleDC(pDC);
bitmap.CreateCompatibleBitmap(pDC, width, height );

pOldBmp = MemDC.SelectObject(&MyBmp);

CBrush brush;
brush.CreateSolidBrush(RGB(255,0,0));

CRect rect;
rect.SetRect (0,0,40,40);
MemDC.SelectObject(&brush);

MemDC.DrawText("Hello",6, &rect, DT_CENTER );
MemDC.SetTextColor(RGB(0,0,255));
GetDC()->BitBlt(0, 0, 50, 50, &MemDC, 0, 0, SRCCOPY);

//When done, than:
MemDC.SelectObject(pOldBmp);
ReleaseDC(&MemDC);
ReleaseDC(pDC);

bitmap.Save(_T("C:\\test.bmp"), Gdiplus::ImageFormatJPEG);

试试这个代码片段