?? scrolldc.htm
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<title>ScrollDC</title>
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<td width="100%" height="16">ScrollDC</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 ScrollDC Lib "user32" Alias
"ScrollDC" (ByVal hdc As Long, ByVal dx As Long, ByVal dy As Long, lprcScroll As
RECT, lprcClip As RECT, ByVal hrgnUpdate As Long, lprcUpdate As RECT) As Long</td>
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<td width="100%" colspan="2">說明</td>
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<td width="100%" colspan="2">在窗口（由設備場景代表）中水平和（或）垂直滾動矩形</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，執(zhí)行成功為非零值，失敗為0，并設置<a
href="GetLastError.htm">GetLastError</a></td>
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<td width="100%" colspan="2">參數(shù)表</td>
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<td width="25%">參數(shù)</td>
<td width="75%">類型及說明</td>
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<td width="25%">hdc</td>
<td width="75%">Long，設備場景句柄</td>
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<td width="25%">dx</td>
<td width="75%">Long，將滾動的水平單位</td>
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<td width="25%">dy</td>
<td width="75%">Long，將滾動的垂直單位</td>
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<td width="25%">lprcScroll</td>
<td width="75%">RECT，要滾動的矩形</td>
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<td width="25%">lprcClip</td>
<td width="75%">RECT，定義剪裁區(qū)的矩形，滾動只能在該區(qū)內(nèi)進行</td>
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<td width="25%">hrgnUpdate</td>
<td width="75%">Long，該區(qū)域設置為客戶坐標系統(tǒng)中不被滾動操作覆蓋的區(qū)，也可為0，則表示沒有設置刷新區(qū)域</td>
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<td width="25%">lprcUpdate</td>
<td width="75%">RECT，該矩形為客戶坐標系統(tǒng)中不被滾動操作覆蓋的區(qū)，也可為0（要求修改vb聲明使之能接收lprcUpdate為長整型參數(shù)）</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">若hrgnUpdate和lprcUpdate都為NULL，windows將不能為該DC計算刷新區(qū)</td>
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