Question

Im trying to send ascii encoded message to a server. My problem is coming in when I try to append the carriage return to the string

-(void)button2Pressed
{
    NSMutableString *mutableString = [NSMutableString stringWithString:@"h323name get"];

    [self sendStringCommand:mutableString];
}

-(void)sendStringCommand:(NSMutableString*)string
{    
    [string appendString:@"\\r"]; 

    NSLog(@"string %@ wtf",[string dataUsingEncoding:NSASCIIStringEncoding]);
    NSData * testData = [[NSData alloc]initWithBytes:[string dataUsingEncoding:NSASCIIStringEncoding] length:sizeof([string dataUsingEncoding:NSASCIIStringEncoding])];


    [socket  writeData:testData withTimeout:20 tag:1];  

}

currently this outputs this:

string <68333233 6e616d65 20676574 5c72> wtf

which should be

string <68333233 6e616d65 20676574 0d> wtf

Just plain /r did a new line hence the wtf characters after the data in the nslog

Answer 1

You have too many backslashes. Try this:

[string appendString:@"\r"]; 

Also, your creation of testData is completely wrong. The way you are creating testData is passing a pointer to an NSData object as the “bytes” parameter, and passing the size of a pointer to an NSData as the “length” parameter. You should just do this:

NSData *testData = [string dataUsingEncoding:NSASCIIStringEncoding];