Question

c++ GDI 图片画好后保存图片问题

Bitmap bmp(L"C:\\1.bmp");

Graphics mygraphics(&bmp);
SolidBrush brush( Color(100,0,0,255) );

FontFamily fontFamily(L"宋体"); //选择一种字体

Font font( &fontFamily, 1, FontStyleRegular,UnitInch );

PointF pointF(5,5);

mygraphics.DrawImage(&bmp,0,0);

mygraphics.DrawString( L"Hello Word!", -1, &font, pointF, &brush );

bmp.Save(L"C:\\2.bmp",&Gdiplus::ImageFormatBMP, NULL);

保存后图片为什么为空啊

Answer 1

DrawImage那一行不需要，然后color的不透明度100改成255试试。

Answer 2

CLSID pngClsid;
GetEncoderClsid(L"image/bmp", &pngClsid);
bmp.Save(L"Mosaic2.bmp", &pngClsid, NULL);