OC NSFileHandle(文件内容操作)

OC NSFileHandle(文件内容操作)

[NSFileHandle fileHandleForUpdatingAtPath:@"data.txt"];

//fileHandleForUpdatingAtPath 可读写
//fileHandleForReadingAtPath  只读
//fileHandleForWritingAtPath  只写

[fileHandle readDataToEndOfFile];

[fileHandle readDataOfLength:5];

[fileHandle writeData:data2];

[fileHandle seekToFileOffset:0];

[fileHandle seekToEndOfFile];

[fileHandle offsetInFile]

[fileHandle truncateFileAtOffset:10];

[fileHandle closeFile];