?? writefile.htm
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<td width="100%" height="16">WriteFile</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 WriteFile Lib "kernel32" Alias
"WriteFile" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite
As Long, lpNumberOfBytesWritten As Long, lpOverlapped As OVERLAPPED) As Long</td>
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<td width="100%" colspan="2">說明</td>
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<td width="100%" colspan="2">將數(shù)據(jù)寫入一個文件。該函數(shù)比<a
href="lwrite.htm">lwrite</a>函數(shù)要靈活的多。也可將這個函數(shù)應用于對通信設備、管道、套接字以及郵槽的處理</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，TRUE（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(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%">hFile</td>
<td width="75%">Long，一個文件的句柄</td>
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<td width="25%">lpBuffer</td>
<td width="75%">Any，要寫入的一個數(shù)據(jù)緩沖區(qū)</td>
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<td width="25%">nNumberOfBytesToWrite</td>
<td width="75%">Long，要寫入數(shù)據(jù)的字節(jié)數(shù)量。如寫入零字節(jié)，表示什么都不寫入，但會更新文件的“上一次修改時間”。針對位于遠程系統(tǒng)的命名管道，限制在65535個字節(jié)以內(nèi)</td>
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<td width="25%">lpNumberOfBytesWritten</td>
<td width="75%">Long，實際寫入文件的字節(jié)數(shù)量</td>
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<td width="25%">lpOverlapped</td>
<td width="75%">OVERLAPPED，倘若在指定FILE_FLAG_OVERLAPPED的前提下打開文件，這個參數(shù)就必須引用一個特殊的結(jié)構(gòu)。那個結(jié)構(gòu)定義了一次異步寫操作。否則，該參數(shù)應置為空（將聲明變?yōu)锽yVal
As Long，并傳遞零值）</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(tǒng)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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