NSFileHandle
1.NSFileManager类主要对于文件的操作(删除，修改，移动，赋值等等)
//判断是否有 tagetPath 文件路径，没有就创建NSFileManager *fileManage = [NSFileManager defaultManager];BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];if (success) {NSLog(@"create success");}
2.NSFileHandle类主要对文件的内容进行读取和写入操作
①NSFileHandle处理文件的步骤
1:创建一个NSFileHandle对象
//创建流NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:srcPath];NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];
2:对打开的文件进行I/O操作
//获取文件路径NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/Date.text"];NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:filePath];//定位到最后[fileHandle seekToEndOfFile];//定位到某个位置，100字节之后[fileHandle seekToFileOffset:100];//追加的数据NSString *str = @"add world";NSData *stringData = [str dataUsingEncoding:NSUTF8StringEncoding];//追加写入数据[fileHandle writeData:stringData];
3:关闭文件对象操作
//关闭流[fileHandle closeFile];
常用处理方法，读
//读取文件内容
void readByFile(){//文件路径NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];NSInteger length = [fileHandle availableData].length;//跳转到指定位置[fileHandle seekToFileOffset:length/2];NSData *data = [fileHandle readDataToEndOfFile];NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];NSLog(@"%@",str);[fileHandle closeFile];}
复制文件
void copy2Other(){NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];NSString *tagetPath = [homePath stringByAppendingPathComponent:@"phone/cellPhone_bak.text"];//是否有这个文件，没有则创建NSFileManager *fileManage =[NSFileManager defaultManager];BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];if (success) {NSLog(@"create success");}//通过 NSFileHandle 读取源文件,写入另一文件中NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];NSData *data = [inFileHandle readDataToEndOfFile];[outFileHandle writeData:data];//关闭流[inFileHandle closeFile];[outFileHandle closeFile];
}
)
