NSFileManager&NSFileHandle NSFileManager&NSFileHandle

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NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"source" ofType:@"pdf"];
//创建用于写入的目标文件
NSString *targetPath = [self.documentsPath stringByAppendingPathComponent:@"target.pdf"];

BOOL success = [[NSFileManager defaultManager] createFileAtPath:targetPath contents:nil attributes:nil]; if (success) { NSLog(@"目标空PDF文件创建成功"); }else{ NSLog(@"目标空PDF文件创建失败"); } NSFileHandle *sourceHandle = [NSFileHandle fileHandleForReadingAtPath:sourcePath]; NSFileHandle *targetHandle = [NSFileHandle fileHandleForWritingAtPath:targetPath]; //通过while循环,每次写入一部分数据,知道全部写入完成 BOOL notEND = YES; //存储当前已经读取的数量 NSInteger readSize = 0; //每次读入的字节大小 NSInteger sizePerTime = 5000; //获取文件总长度 NSDictionary *attr = [[NSFileManager defaultManager] attributesOfItemAtPath:sourcePath error:nil]; NSLog(@"attr:%@",attr); NSNumber *sizeNumber = [attr objectForKey:NSFileSize]; NSInteger fileToltalNum = sizeNumber.integerValue; //记录循环的次数,表示读取了源文件多少次 int count = 0; while (notEND) { NSInteger leftSize = fileToltalNum - readSize; NSData *data = https://www.it610.com/article/nil; //如果剩下的超过5000,则读5000,如果剩下的少于5000,则读到结尾if (leftSize>= sizePerTime) { data = [sourceHandle readDataOfLength:sizePerTime]; //读完5000以后修改已读的数量 readSize += sizePerTime; //移动读取源文件的指针到新的位置 [sourceHandle seekToFileOffset:readSize]; }else{ //把剩余数据读出来 data = [sourceHandle readDataToEndOfFile]; //把还没读完设置为NO; notEND = NO; } //把data写入目标文件 [targetHandle writeData:data]; //读写次数加1 count +=1; }[sourceHandle closeFile]; [targetHandle closeFile]; NSLog(@"总共读了%d次",count);

【NSFileManager&NSFileHandle】`