📄 invalidaterect.htm
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<title>InvalidateRect</title>
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<td width="100%" height="16"><a name="InvalidateRect,InvalidateRectBynum">InvalidateRect,InvalidateRectBynum</a></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 InvalidateRect& Lib "user32"
(ByVal hwnd As Long, lpRect As RECT, ByVal bErase As Long)<br>
Declare Function InvalidateRectBynum& Lib "user32" Alias
"InvalidateRect" (ByVal hwnd As Long, ByVal lpRect As Long, ByVal bErase As
Long)</td>
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<td width="100%" colspan="2">说明</td>
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<td width="100%" colspan="2">这个函数屏蔽一个窗口客户区的全部或部分区域。这会导致窗口在事件期间部分重画</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，非零表示成功，零表示失败</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%">hwnd</td>
<td width="75%">Long，待屏蔽窗口的句柄</td>
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<td width="25%">lpRect</td>
<td width="75%"><a href="RECT.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/RECT.htm">RECT</a>，用于描述待屏蔽矩形部分的一个矩形结构。可用InvalidateRectBynum函数，同时将lpRect设为零（Long数据类型），从而屏蔽（或禁用）整个窗口</td>
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<td width="25%">bErase</td>
<td width="75%">Long，TRUE（非零）导致指定的区域在重画前先删除</td>
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<td width="100%" colspan="2">注解</td>
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<td width="100%" colspan="2"><p align="left">一旦系统有些更新屏幕的闲置时间可用，windows就会重画窗口</td>
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<td width="100%"><p align="right"><a href="#InvalidateRect,InvalidateRectBynum">Top</a></td>
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