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序号：62274 发表者：汉时明月 发表日期：2003-11-25 19:52:48
<br>主题：各位大虾，怎样使位图的背景色与对话框的颜色一样？？？
<br>内容：如题：如果要在对话框的picture 控件里显示的位图的背景色与对话框颜色一致，如何作？就像背景透明那样，只显示主要的图像 <BR>谢谢各位<BR>
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回复者：萨达姆的黑手掌 回复日期：2003-11-25 22:04:56
<br>内容：&nbsp;&nbsp;&nbsp;&nbsp;我记得在directdraw里是设关键色，MFC或是API有没有这种函数就不知道了。
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回复者：BigJames 回复日期：2003-11-26 11:31:40
<br>内容：那可以就得自己装载控制bmp了。<BR>看一下CImageList，在create的时候，指定和bmp背景色匹配的掩码，然后在你需要的地方/时间把他画到屏幕上就行了。
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<font color=red>答案被接受</font><br>回复者：元元 回复日期：2003-12-02 15:25:15
<br>内容：对话框的picture 控件的hdc， hBitmap指的是位图句柄，xStart和yStart在控件上<BR>开始画的位置，位图的背景色，这是你需要屏蔽的,用法如下所示：<BR>DrawTransparent(hDC, hBitmap, 0, 0, RGB(255, 255, 255));<BR>RGB（255，255，255）表示要屏蔽图像中的白色<BR><BR>void DrawTransparent( HDC hdc, HBITMAP hBitmap, int xStart, int yStart, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; COLORREF cTransparentColor)<BR>{<BR>&nbsp;&nbsp; BITMAP&nbsp;&nbsp;&nbsp;&nbsp; bm;<BR>&nbsp;&nbsp; COLORREF&nbsp;&nbsp; cColor;<BR>&nbsp;&nbsp; HBITMAP&nbsp;&nbsp;&nbsp;&nbsp;bmBackground,&nbsp;&nbsp;bmObject,&nbsp;&nbsp;bmSave;&nbsp;&nbsp; <BR>&nbsp;&nbsp; HDC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hdcBackground, hdcObject, hdcTemp,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hdcSave;<BR>&nbsp;&nbsp; POINT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ptSize;&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp; GetObject( hBitmap,&nbsp;&nbsp;sizeof( bm ), (LPSTR)&amp;bm );<BR>&nbsp;&nbsp; ptSize.x = bm.bmWidth;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp; ptSize.y = bm.bmHeight;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <BR><BR>&nbsp;&nbsp; //-------------------------------------------------------------<BR>&nbsp;&nbsp; //&nbsp;&nbsp; Create compatible DC<BR>&nbsp;&nbsp; //-------------------------------------------------------------<BR>&nbsp;&nbsp; hdcTemp = CreateCompatibleDC( hdc );&nbsp;&nbsp; <BR>&nbsp;&nbsp; hdcSave = CreateCompatibleDC( hdc );<BR>&nbsp;&nbsp; hdcBackground = CreateCompatibleDC( hdc );<BR>&nbsp;&nbsp; hdcObject = CreateCompatibleDC( hdc );&nbsp;&nbsp;<BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp; SelectObject( hdcTemp, hBitmap ); <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// save the bitmap<BR>&nbsp;&nbsp; bmSave=CreateCompatibleBitmap(hdc,ptSize.x, ptSize.y);<BR>&nbsp;&nbsp; SelectObject(hdcSave,bmSave);<BR>&nbsp;&nbsp; BitBlt( hdcSave, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY );<BR><BR>&nbsp;&nbsp; //---------------------------------------------------------------<BR>&nbsp;&nbsp; // Create a bitmap for each DC. DCs are required for a number of<BR>&nbsp;&nbsp; // GDI functions. Monochrome DC ------get a white background<BR>&nbsp;&nbsp; //---------------------------------------------------------------<BR>&nbsp;&nbsp; bmBackground&nbsp;&nbsp; = CreateBitmap( ptSize.x, ptSize.y, 1, 1, NULL );<BR>&nbsp;&nbsp; SelectObject( hdcBackground, bmBackground );&nbsp;&nbsp;<BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp; cColor = SetBkColor( hdcTemp, cTransparentColor );&nbsp;&nbsp;<BR>&nbsp;&nbsp; BitBlt( hdcBackground, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY );<BR>&nbsp;&nbsp; SetBkColor( hdcTemp, cColor );&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp; //---------------------------------------------------------------<BR>&nbsp;&nbsp; // Monochrome DC&nbsp;&nbsp;--- get a white object<BR>&nbsp;&nbsp; //---------------------------------------------------------------<BR>&nbsp;&nbsp; bmObject = CreateBitmap( ptSize.x, ptSize.y, 1, 1, NULL );<BR>&nbsp;&nbsp; SelectObject( hdcObject, bmObject );<BR>&nbsp;&nbsp; BitBlt(hdcObject, 0, 0, ptSize.x, ptSize.y, hdcBackground, 0, 0, NOTSRCCOPY );<BR>&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BitBlt( hdc, xStart, yStart, ptSize.x, ptSize.y, hdcBackground, 0, 0, SRCAND );&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BitBlt( hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0, SRCAND);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BitBlt( hdc, xStart, yStart, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCPAINT );<BR><BR>&nbsp;&nbsp; BitBlt( hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcSave, 0, 0, SRCCOPY );//restore<BR><BR>&nbsp;&nbsp; DeleteDC( hdcTemp );<BR>&nbsp;&nbsp; DeleteDC( hdcBackground);<BR>&nbsp;&nbsp; DeleteDC( hdcObject );<BR>&nbsp;&nbsp; DeleteDC( hdcSave );<BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp; DeleteObject( bmBackground );<BR>&nbsp;&nbsp; DeleteObject( bmObject );<BR>&nbsp;&nbsp; DeleteObject( bmSave );&nbsp;&nbsp; <BR>&nbsp;&nbsp; <BR>}<BR>
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