文件读写(Windows API)--ReadFile、WriteFile - 简书

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DWORD nRead; ReadFile(hout, buff2, 40, &nRead, NULL); Also, rename hin and hout. share | improve this answer | follow | answered Oct 24 '10 at 22:25. Abyx Abyx. 10.4k 4 4 gold badges 34 34 silver badges 71 71 bronze badges. add a comment | 6. Others have already answered your question. This is about the code. // Your code: // System Programming.cpp : Defines the entry point for the console BOOL WINAPI ReadFile( _In_ HANDLE hFile, _Out_ LPVOID lpBuffer, _In_ DWORD nNumberOfBytesToRead, _Out_opt_ LPDWORD lpNumberOfBytesRead, _Inout_opt_ LPOVERLAPPED lpOverlapped ); 参数: hFile. 函数指针. lpBuffer. 指针指向从文件读出的数据存放的缓冲区. nNumberOfBytesToRead 用法和参数可以参照上面的ReadFile的说明。 在使用这个函数的时候,它打开的文件的句柄一定要有写的权限。 如果用和上面的示例那个调用函数一样的参数来调用WriteFile函数的话,是把数据添加到文件的末尾处。 GetFileSize 函数原型 DWORD WINAPI GetFileSize( HANDLE hFile, LPDWORD lpFileSizeHigh ); 参数. hFile:文件 The ReadFile function may fail with ERROR_NOT_ENOUGH_QUOTA, which means the calling process's buffer could not be page-locked. For additional information, see SetProcessWorkingSetSize . If part of a file is locked by another process and the read operation overlaps the locked portion, this function fails. ReadFile will do what you want - the OS may do some read ahead of data to opportunisticly cache data, but it will not read the entire 500 MB of file in. If you really want to have no buffering, pass FILE_FLAG_NO_BUFFERING to CreateFile, and ensure that your file accesses are a multiple of volume sector size. I strongly suggest you do not do this - the system file cache exists for a reason and

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