c - Read a text file line by line using Win32 API - Stack

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c windows file winapi. share | follow | edited Apr 1 '13 at 11:05. Anish Ramaswamy. 2,206 3 3 gold badges 24 24 silver badges 62 62 bronze badges. asked Apr 1 '13 at 8:04. Ayse Ayse. 2,336 9 9 gold badges 32 32 silver badges 54 54 bronze badges. add a comment | 4 Answers Active 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 Using the WIN32 API Functions CreateFile, ReadFile, WriteFile, SetFilePointer from C# What if for some reason you need to use the WIN32 API to read and write files? I know FileStream can do a lot of what the WIN32 API can do, but this is a "what if".... a hypothetical situation, ok! (don't think for one second I did this because I thought I couldn't seek to a spot in a file and write some 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.

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