?? getupdatergn.htm
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<td width="100%" height="16">GetUpdateRgn</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 GetUpdateRgn Lib "user32" Alias
"GetUpdateRgn" (ByVal hwnd As Long, ByVal hRgn As Long, ByVal fErase 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">確定指定窗口的刷新區域。該區域當前無效，需要刷新</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，下列常數之一，以描述當前剪裁區：<br>
COMPLEXREGION：該區域有互相交疊的邊界<br>
SIMPLEREGION：該區域邊界沒有互相交疊<br>
NULLREGION：區域為空<br>
ERRORAPI：發生了錯誤</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%">hwnd</td>
<td width="75%">Long，將確定刷新區域的窗口的句柄</td>
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<td width="25%">hRgn</td>
<td width="75%">Long，裝載hwnd窗口刷新區域的區域句柄</td>
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<td width="25%">fErase</td>
<td width="75%">Long，為非零值表示窗口背景應擦除，客戶區外的窗口部分是被重畫<br>
原文：TRUE (nonzero) to specify that the window background should be erased and parts
of the window outside of the client area should be redrawn.</td>
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