📄 writefileex.htm
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<td width="100%" height="16">WriteFileEx</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 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">说明</td>
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<td width="100%" colspan="2">与<a href="WriteFile.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/WriteFile.htm">WriteFile</a>类似，只是它只能用于异步写操作，并包括了一个完整的回调</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，否则返回零。会设置<a
href="GetLastError.htm" tppabs="http://personal.hb.cninfo.net/~vbapi/GetLastError.htm">GetLastError</a></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%">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，指定一个缓冲区，其中包含了要写入的数据。除非写操作完成，否则不要访问这个缓冲区</td>
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<td width="25%">nNumberOfBytesToWrite</td>
<td width="75%">Long，要写入数据的字节量</td>
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<td width="25%">lpOverlapped</td>
<td width="75%">OVERLAPPED，定义了一次异步写操作的结构。使用这个函数时，结构中的hEvent字段会被忽略</td>
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<td width="25%">lpCompletionRoutine</td>
<td width="75%">Long，回调函数的值</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">并不是每种操作系统都支持在任何类型的设备上进行异步操作。windows
95不支持对磁盘文件的重叠读取操作</td>
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<td width="100%"><p align="right">Top</td>
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