HERE IS THE CODE->
NSString* message = @"username,password";
NSMutableData *data = [[NSMutableData alloc] initWithData:
[message dataUsingEncoding:NSASCIIStringEncoding]];
[data appendBytes:"0x1""0x1""0x0"
length:3];
I am expecting output -> username,password110
but not getting this.
What you are appending is not bytes, it's a string "0x10x10x0"
. The first three characters get appended - specifically, '0'
, 'x'
, and '1'
.
To append three bytes, create a byte array, and append it:
unsigned char suffixBytes[] = {1, 1, 0};
[data appendBytes:suffixBytes length:3];
In one specific case, when all bytes represent character codes of printable characters, you can use a string literal instead:
[data appendBytes:"110" length:3];
This will append character codes of '1'
, '1'
, and '0'
to your data. Assuming ASCII encoding, the values would be {0x31, 0x31, 0x30}
.
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