Question

I’m getting weird NSString value after performing a conversion. For example, I have one byte with value 2 (00000010) that is stored in response. I tried both NSString initWithData and initWithBytes but both return weird symbol (upside down question mark). Here’s my code:

NSString *command1 = [[NSString alloc] initWithData:response encoding:NSASCIIStringEncoding];
NSString *command2 = [[NSString alloc] initWithBytes:[response bytes] length:[response length] encoding:NSASCIIStringEncoding];

NSLog(@"command1: %@", command1);
NSLog(@"command2: %@", command2);

Also tried NSUTF8StringEncoding but NSASCIIStringEncoding is correct one because data comes encoded one byte per symbol.

Answer 1

From what I am reading, this is what you want:

NSString *stringWithContentsOfBinaryData(NSData *data)
{
    NSMutableString *output;

    int len = [data length];
    uint8_t *bytes = [data bytes];
    for (int i = 0; i < len; i++)
    {
        [output appendFormat:@"%i", bytes[i]];
    } 

    return output;
}

It just simply converts each byte to it’s integer representation and concatenates that into a string.