3.NSData

最新推荐文章于 2024-06-19 22:43:07 发布

转载最新推荐文章于 2024-06-19 22:43:07 发布 · 290 阅读

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NSData
- 类型转换
- 文件读写

NSData

用于将数据块传递给一个函数或方法
用于存储二进制的数据类型

类型转换

NSString NSData

    NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
    NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSDictionary NSData -JSON

    NSData *data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

NSDictionary NSData

    NSMutableData *data= [[NSMutableData alloc] init];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData: data];
    [archiver encodeObject:dic forKey:@"Some Key Value"];
    [archiver finishEncoding];
    NSLog(@"%@",data);

    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:dic2data];
    NSDictionary *dic= [unarchiver decodeObjectForKey:@"Some Key Value"];
    [unarchiver finishDecoding];
    NSLog(@"%@",dic);

NSData 、Byte

    NSString *testString = @"1234567890"; 
    NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
    Byte *testByte = (Byte *)[testData bytes];

　　　Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
    NSData *data = [[NSData alloc] initWithBytes:byte length:24];

NSArray转NSData

    NSData *data= [NSKeyedArchiver archivedDataWithRootObject:array];

NSData转UIImage

    UIImage *image = [UIImage imageWithData: data];

文件读写

    //将文件的内容读入内存缓冲区
    NSFileManager *fileManager = [[NSFileManager alloc]init];
    NSData *fileData = [fileManager contentsAtPath:path];

　　//将缓冲区的内容写入到一个文件中
    NSFileManager *fileManager = [[NSFileManager alloc]init];
    [fileManager createFileAtPath:path contents:fileData attributes:nil];