请教api函数ReadFile的用法

[kenryHuang]

抱歉，我没有msdn,没办法查询

[idAnts]

http://www.allapi.net/apilist/apifunction.php?apifunction=ReadFile

[kenryHuang]

有中文的吗？

[pdp]

BOOL ReadFile(
HANDLE hFile, // handle to file
LPVOID lpBuffer, // data buffer
DWORD nNumberOfBytesToRead, // number of bytes to read
LPDWORD lpNumberOfBytesRead, // number of bytes read
LPOVERLAPPED lpOverlapped // overlapped buffer
);
// set up overlapped structure fields
gOverLapped.Offset = 0;
gOverLapped.OffsetHigh = 0;
gOverLapped.hEvent = hEvent;

// attempt an asynchronous read operation
bResult = ReadFile(hFile, &inBuffer, nBytesToRead, &nBytesRead,
&gOverlapped) ;

// if there was a problem, or the async. operation's still pending ...
if (!bResult)
{
// deal with the error code
switch (dwError = GetLastError())
{
case ERROR_HANDLE_EOF:
{
// we're reached the end of the file
// during the call to ReadFile

// code to handle that
}

case ERROR_IO_PENDING:
{
// asynchronous i/o is still in progress

// do something else for a while
GoDoSomethingElse() ;

// check on the results of the asynchronous read
bResult = GetOverlappedResult(hFile, &gOverlapped,
&nBytesRead, FALSE) ;

// if there was a problem ...
if (!bResult)
{
// deal with the error code
switch (dwError = GetLastError())
{
case ERROR_HANDLE_EOF:
{
// we're reached the end of the file
//during asynchronous operation
}

// deal with other error cases
}
}
} // end case

// deal with other error cases

} // end switch
} // end if

[kiko_lee]

用法？
你直接用 FILE *fp;
open(....);
read(...);
就可以了吧