?? excludeupdatergn.htm
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<td width="100%" height="16">ExcludeUpdateRgn</td>
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<td width="100%" colspan="2">VB聲明</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">說明</td>
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<td width="100%" colspan="2">從專用設備場景剪裁區去掉指定窗口的刷新區域。這防止對無效區繪圖（該無效區將推遲一點再刷新）</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，見<a href="ExcludeClipRect.htm">ExcludeClipRect</a>函數返回值</td>
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<td width="100%" colspan="2">參數表</td>
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<td width="25%">參數</td>
<td width="75%">類型及說明</td>
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<td width="25%">hdc</td>
<td width="75%">Long，設備場景，其剪裁區將被修改以排除hwnd窗口的刷新區</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">設您要完成一個較長或復雜的繪圖操作，該函數可允許您避免畫到現在沒有遮蓋而隨后即將畫的區域。這可提高性能并消除閃爍效果</td>
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