?? writefileex.htm
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<td width="100%" height="16">WriteFileEx</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 WriteFileEx Lib "kernel32" Alias
"WriteFileEx" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite
As Long, lpOverlapped As OVERLAPPED, ByVal lpCompletionRoutine 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">與<a href="WriteFile.htm">WriteFile</a>類似，只是它只能用于異步寫操作，并包括了一個完整的回調</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，否則返回零。會設置<a
href="GetLastError.htm">GetLastError</a></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%">hFile</td>
<td width="75%">Long，文件的句柄</td>
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<td width="25%">lpBuffer</td>
<td width="75%">Any，指定一個緩沖區，其中包含了要寫入的數據。除非寫操作完成，否則不要訪問這個緩沖區</td>
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<td width="25%">nNumberOfBytesToWrite</td>
<td width="75%">Long，要寫入數據的字節量</td>
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<td width="25%">lpOverlapped</td>
<td width="75%">OVERLAPPED，定義了一次異步寫操作的結構。使用這個函數時，結構中的hEvent字段會被忽略</td>
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<td width="25%">lpCompletionRoutine</td>
<td width="75%">Long，回調函數的值</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">并不是每種操作系統都支持在任何類型的設備上進行異步操作。windows
95不支持對磁盤文件的重疊讀取操作</td>
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<td width="100%"><p align="right">Top</td>
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