ios http request sending json format - ios

Question

I am trying to call a web service with these parameters:
{"Class":"Authorization","method":"login","user":"","pass":""}
as follows
NSString *user = [NSString stringWithFormat:#"username=%#",_username.text];
NSString *pass = [NSString stringWithFormat:#"password=%#",_password.text];
NSString *Class = #"Authorization";
NSString *method = #"login";
//NSString *post = [NSString stringWithFormat:#"%#&%#&%#&%#", user, pass, Class, method ];
NSString *jsonPostBody = [NSString stringWithFormat:#"'json' = '{\"Class\":"
"\"%#\""
",\"method\":"
"\"%#\""
",\"pass\":"
"\"%#\""
",\"user\":"
"\"%#\""
"}'",
[Class stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[method stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[pass stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[user stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSData *postData = [jsonPostBody dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSURL *url = [NSURL URLWithString:#"http://212.119.87.45:8080/IktissabServices/index.php/service"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:180.0];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[[jsonPostBody stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]
dataUsingEncoding:NSUTF8StringEncoding
allowLossyConversion:YES]];
[request setHTTPBody:postData];
NSString* postDataLengthString = [[NSString alloc] initWithFormat:#"%d", [postData length]];
[request setValue:postDataLengthString forHTTPHeaderField:#"Content-Length"];
NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
NSError *error;
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&error];//
if (! error) {
NSLog(#"%#",jsonDict);
}else{
NSLog(#"%#",error.localizedDescription);
}
Every time the result is:
Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'data parameter is nil'
The web service has:
input-content-type: text/json
output-content-type: text/json
Any help or examples will be appreciated.

Answer 1

I'm not getting any exception with the following code (though obviously I don't have access to your server, so I can't test it end-to-end):
NSDictionary *dictionary = #{
#"Class" : #"Authorization",
#"method" : #"login",
#"pass" : _password.text,
#"user" : _username.text
};
NSError *error;
NSData *postData = [NSJSONSerialization dataWithJSONObject:dictionary
options:0
error:&error];
if (error)
NSLog(#"Failure to serialize JSON object %#", error);
NSURL *url = [NSURL URLWithString:#"http://212.119.87.45:8080/IktissabServices/index.php/service"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:180.0];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse *response;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
NSLog(#"%s sendSynchronousRequest error %#", __FUNCTION__, error);
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&error];//
if (!error) {
NSLog(#"%#",jsonDict);
} else {
NSLog(#"%s JSONObjectWithData error %#", __FUNCTION__, error);
}
Or, if you're not using the latest Xcode and don't have access to the Modern Objective C definition of the dictionary, you could obviously define your dictionary the traditional way:
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
#"Authorization", #"Class",
#"login", #"method",
_password.text, #"pass",
_username.text, #"user",
nil];
Edit:
Inferring from your jsonPostBody, the dictionary entry might need to be:
NSDictionary *dictionary = #{
#"json" : #{
#"Class" : #"Authorization",
#"method" : #"login",
#"pass" : _password.text,
#"user" : _username.text
}
};
or possibly (though, even less likely), inferring from your user and pass definitions:
NSDictionary *dictionary = #{
#"json" : #{
#"Class" : #"Authorization",
#"method" : #"login",
#"pass" : [NSString stringWithFormat:#"password=%#",_password.text],
#"user" : [NSString stringWithFormat:#"username=%#",_username.text]
}
};
It's a question of how the JSON needs to be formatted for your server.