?? readfileex.htm
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<td width="100%" height="16">ReadFileEx</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 ReadFileEx Lib "kernel32" Alias
"ReadFileEx" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead
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="ReadFile.htm">ReadFile</a>相似，只是它只能用于異步讀操作，并包含了一個(gè)完整的回調(diào)</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，零表示失敗。會(huì)設(shè)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，文件的句柄</td>
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<td width="25%">lpBuffer</td>
<td width="75%">Any，指定容納讀入數(shù)據(jù)的一個(gè)緩沖區(qū)。除非讀操作執(zhí)行完畢，否則不要訪問這個(gè)緩沖區(qū)</td>
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<td width="25%">nNumberOfBytesToRead</td>
<td width="75%">Long，要讀入的字節(jié)數(shù)</td>
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<td width="25%">lpOverlapped</td>
<td width="75%">OVERLAPPED，定義了一個(gè)異步操作的結(jié)構(gòu)。使用這個(gè)函數(shù)時(shí)，結(jié)構(gòu)中的hEvent字段會(huì)被忽略</td>
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<td width="25%">lpCompletionRoutine</td>
<td width="75%">Long，回調(diào)函數(shù)的返回值</td>
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<td width="100%"><p align="right">Top</td>
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