📄 excludeupdatergn.htm
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<td width="100%" height="16">ExcludeUpdateRgn</td>
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<td width="100%" colspan="2">VB声明</td>
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<td width="100%" colspan="2">Declare Function ExcludeUpdateRgn Lib "user32"
Alias "ExcludeUpdateRgn" (ByVal hdc As Long, ByVal hwnd As Long) As Long</td>
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<td width="100%" colspan="2">说明</td>
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<td width="100%" colspan="2">从专用设备场景剪裁区去掉指定窗口的刷新区域。这防止对无效区绘图（该无效区将推迟一点再刷新）</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，见<a href="ExcludeClipRect.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/ExcludeClipRect.htm">ExcludeClipRect</a>函数返回值</td>
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<td width="100%" colspan="2">参数表</td>
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<td width="25%">参数</td>
<td width="75%">类型及说明</td>
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<td width="25%">hdc</td>
<td width="75%">Long，设备场景，其剪裁区将被修改以排除hwnd窗口的刷新区</td>
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<td width="25%">hwnd</td>
<td width="75%">Long，窗口句柄</td>
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<td width="100%" colspan="2">在vb中使用</td>
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<td width="100%" colspan="2"><p align="left">设您要完成一个较长或复杂的绘图操作，该函数可允许您避免画到现在没有遮盖而随后即将画的区域。这可提高性能并消除闪烁效果</td>
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<td width="100%"><p align="right">Top</td>
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