BLENDFUNCTION blend; memset( &blend, 0, sizeof( blend) ); blend.BlendOp= AC_SRC_OVER; blend.SourceConstantAlpha= 140; // 透明度 最大255 pdc->AlphaBlend( DestX,DestY, DestWid,DestHei,&srcDC, 0, 0, nDragWidth, nDragHeight, blend);