" charachter changing for JSON

Question

I have drugnames like drugnameexmp "20 tbl"

The ' " ' charachter makes trouble for creating a NSString that it is for JSON.

{\"drugname\":\"%@\",drugname} 

How can I change '"' charachter for it?The below code is what I tried.

[drug setValue:[[drug objectForKey:@"drug_name"] stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""] forKey:@"drug_name"];

Thank you.

Edited:

It acts like this:

{
"drugname":"drugnameexmp "20 tbl",
"id":123

}

"drugnameexmp "20 tbl" looks like this: "drugnameexmp " + 20 tbl" ' " ' parses the NSString. I want " drugnameexmp '20 tbl' ".

NSString *s=[NSString stringWithFormat:@"{\"drugname\":\"%@\",\"id\":%d,drugname,id} "];
 NSData *myPostData = [s dataUsingEncoding:NSUTF8StringEncoding];
    NSMutableData *myMutablePostData = [[NSMutableData alloc]initWithData:myPostData];

    [request setPostBody:myMutablePostData];
    [request setRequestMethod:@"POST"];
    [request addRequestHeader:@"Content-Type" value:@"application/json"];
    [request setDelegate:self];
    [request startSynchronous];

Answer 1

It is much easier just to use a JSON serializer.

NSDictionary *JSON = @{ @"drugname" : drugname, @"id" : ID };
NSData *myPostData = [NSJSONSerialization dataWithJSONObject:JSON options:0 error:NULL];