iOS数据类型转换

//    String str = "你好啊,aBc!";
//    ByteArrayOutputStream baos = new ByteArrayOutputStream();
//    DataOutputStream outputstream = new DataOutputStream(baos);
//    outputstream.writeChars(str);
//    
//    byte[] contents = baos.toByteArray();
//    for (int i = 0; i < contents.length; i++) {
//        System.out.println("contents:"+contents[i]);
//    }
//    
//    NSString *str = @"你好啊,aBc!";
//    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(NSUTF16BigEndianStringEncoding);
//    NSData *data = [str dataUsingEncoding:enc];
//    
//    Byte *byte = (Byte *)[data bytes];
//    for (int i=0 ; i<[data length]; i++) {
//        NSLog(@"byte = %d",byte[i]);
//    }

iOS中，将NSData转NSString的一般方法为[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];但是当data中包含00时，所获得的新字符就会为nil，这时我们应该这样转

[NSString stringWithUTF8String:[data bytes]];狗日的骗老子

NSString *testString = @"妈妈";
    NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
    Byte *testByte = (Byte *)[testData bytes];
    NSMutableArray *byte = [NSMutableArray array];
    for(int i=0;i<[testData length];i++)
        //printf("testByte = %d
",testByte[i])
       // Byte *byte[i] = testByte[i];
        [byte addObject:@(testByte[i])];
    NSLog(@"array=%@",byte);

正解