NSFileHandle

1.NSFileManager類主要對于文件的操作(刪除，修改，移動，賦值等等)

//判斷是否有 tagetPath 文件路徑，沒有就創(chuàng)建NSFileManager *fileManage = [NSFileManager defaultManager];BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];if (success) {NSLog(@"create success");}

2.NSFileHandle類主要對文件的內(nèi)容進(jìn)行讀取和寫入操作

①NSFileHandle處理文件的步驟

1:創(chuàng)建一個NSFileHandle對象

//創(chuàng)建流NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:srcPath];NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];

2:對打開的文件進(jìn)行I/O操作

//獲取文件路徑NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/Date.text"];NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:filePath];//定位到最后[fileHandle seekToEndOfFile];//定位到某個位置，100字節(jié)之后[fileHandle seekToFileOffset:100];//追加的數(shù)據(jù)NSString *str = @"add world";NSData *stringData = [str dataUsingEncoding:NSUTF8StringEncoding];//追加寫入數(shù)據(jù)[fileHandle writeData:stringData];

3:關(guān)閉文件對象操作

　　//關(guān)閉流[fileHandle closeFile];

常用處理方法，讀

//讀取文件內(nèi)容 void readByFile(){//文件路徑NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];NSInteger length = [fileHandle availableData].length;//跳轉(zhuǎn)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];}

復(fù)制文件

void copy2Other(){NSString *homePath = NSHomeDirectory();NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];NSString *tagetPath = [homePath stringByAppendingPathComponent:@"phone/cellPhone_bak.text"];//是否有這個文件，沒有則創(chuàng)建NSFileManager *fileManage =[NSFileManager defaultManager];BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];if (success) {NSLog(@"create success");}//通過 NSFileHandle 讀取源文件,寫入另一文件中NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];NSData *data = [inFileHandle readDataToEndOfFile];[outFileHandle writeData:data];//關(guān)閉流[inFileHandle closeFile];[outFileHandle closeFile]; }

轉(zhuǎn)載于:https://www.cnblogs.com/ShaoYinling/p/4746541.html

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