HttpRequest Body parameters in iOS - ios

Question

I am using web service for my iOS app.
I know how to send http post request via URL (not http Body) and get response using NSURLConnection Delegate.
But now there is better approach which I am following for web service and passing parameters in request body. I looked for library on google and found this.
But the code is bit difficult for me and I suppose there should be function for the same, which can make this bit easier.
Is there any? the code so far is below.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
initWithURL:[NSURL
URLWithString:**WebService URL**]];
[request setHTTPMethod:#"POST"];
[request setValue:#"text/json" forHTTPHeaderField:#"Content-type"];
NSString *jsonString = [NSString stringWithFormat:#"{\n\"username\":\"%#\",\n\"%#\":\"%#\",\n\"%#\":\"%#\",\n\"%#\":%#,\n\"%#\":%#,\n\"version\":%#,\n\"name\":\"%#\"\n}",userName, #"password",pass,#"accessToken",token,#"isOnline",#"True",#"accountType",type,#"False",name];
[request setHTTPBody:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
jsonString in this code is the http body. I want to pass parameters in request body.
Now, after executing this code i get null in NSData variable. whereas my web service function returns a value and also it returns if the execution was successful.
what is wrong in my code.
Thank you.

Answer 1

Thanks for your answers. Finally I found the exact solution which works absolutely fine.
I have used NSURLConnection delegate and I am passing parameter in HTTPBody in json. I am receiving response also in json.
But sending parameter directly as json is not permitted in httprequestbody so we need to take it in NSData and set content-type.
Note: specifying content type is very important.
-(void)sendDataToServer:(NSString*)userName :(NSString*)name{
{
NSArray *keys = [NSArray arrayWithObjects: #"name",#"accountType",#"isOnline",#"username", nil];
NSArray *objects = [NSArray arrayWithObjects:name,[NSNumber numberWithBool:false],[NSNumber numberWithBool:false],userName, nil];
NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
NSString *myJSONString =[jsonDictionary JSONRepresentation];
NSData *myJSONData =[myJSONString dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"myJSONString :%#", myJSONString);
NSLog(#"myJSONData :%#", myJSONData);
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:Your URL string]];
[request setHTTPBody:myJSONData];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
if (theConnection) {
NSLog(#"connected");
receivedData=[[NSMutableData alloc]init];
} else {
NSLog(#"not connected");
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[receivedData appendData:data];
NSString* responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"response: %#",responseString);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// do something with the data
// receivedData is declared as a method instance elsewhere
NSLog(#"Succeeded! Received %lu data",(unsigned long)[receivedData length]);
NSString* responseString = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
NSLog(#"response: %#",responseString);
NSError *myError = nil;
NSDictionary *res = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableLeaves error:&myError];
// show all values
for(id key in res) {
id value = [res objectForKey:key];
NSString *keyAsString = (NSString *)key;
NSString *valueAsString = (NSString *)value;
NSLog(#"key: %#", keyAsString);
NSLog(#"value: %#", valueAsString);
}
}
P.S : You will need to add JSon files for serialization(json.h).

Answer 2

Check out this question nsurlrequest post body and this http post encode type
Generally, the body should conforms to "key=value" format
To your question, you need a "key" for your jsonString
[request setHTTPBody:[NSString stringWithFormat:#"postedJson=%#", jsonString]];
postedJson is the key through which you'll get the value of it at server side.
such as:
request["postedJson"]
the value returned would be the jsonString you construted

Answer 3

There is a typo in your sample code, this would explain the null result :
NSString ***jsonString** = [NSString stringWithFormat:#"{\n\"username\":\"%#\",\n\"%#\":\"%#\",\n\"%#\":\"%#\",\n\"%#\":%#,\n\"%#\":%#,\n\"version\":%#,\n\"name\":\"%#\"\n}",userName, #"password",pass,#"accessToken",token,#"isOnline",#"True",#"accountType",type,#"False",name];
[request setHTTPBody:[**xmlString** dataUsingEncoding:NSUTF8StringEncoding]];