How to send multiple parameterts to PHP server in HTTP post - ios

Question

I'm sending base64 string to php server and its working well. Now I want to send another parameter as a string. Can anyone tell me what code need to add in below code.
Below code is working good for single parameter. How can we modify it for multiple parameters?
NSData *data = [UIImageJPEGRepresentation(imgeview.image,90) base64Encoding];
// Create your request string with parameter name as defined in PHP file
NSString *myRequestString = [NSString stringWithFormat:#"question_image=%#",data];
myRequestString = [myRequestString stringByReplacingOccurrencesOfString:
#"+" withString:#"%2B"];
// Create Data from request
NSData *myRequestData = [NSData dataWithBytes:[myRequestString UTF8String]
length:[myRequestString length]];
request = [[NSMutableURLRequest alloc] initWithURL:
[NSURL URLWithString:#"http://192.168.0.101/Mobile_tutor/webservice/question_details.php"]];
// set Request Type
[request setHTTPMethod:#"POST"];
// Set content-type
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"content-type"];
// Set Request Body
[request setHTTPBody:myRequestData];
// Now send a request and get Response
NSData *returnData = [NSURLConnection sendSynchronousRequest:request
returningResponse:nil
error: nil];
// Log Response
NSString *response = [[NSString alloc] initWithBytes:[returnData bytes]
length:[returnData length]
encoding:NSUTF8StringEncoding];
NSLog(#"-------------%#",response); // here you get reasponse string

Answer 1

For the network operation these is better supporting API like AFNetworking available witch work async and way better to handle
Tutorials for AFNetworking
Get from here
NSArray *keys = #[#"UserID", ];
NSArray *objects = #[#(userId)];
NSDictionary *parameter = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:
[NSURL URLWithString:BaseURLString]];
[httpClient setParameterEncoding:AFJSONParameterEncoding];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];
NSMutableURLRequest *request = [httpClient requestWithMethod:#"POST"
path:#"services/UserService.svc/GetUserInfo"
parameters:parameter];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSError* error = nil;
id jsonObject = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
if ([jsonObject isKindOfClass:[NSDictionary class]]) {
// do what ever
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];

Answer 2

Given a NSDictionary "params" whose keys and values are strings and where every entry represents one parameter (name/value) you can define a helper category:
#interface NSDictionary (FormURLEncoded)
-(NSData*) dataFormURLEncoded;
#end
dataFormURLEncoded returns a properly encoded character sequence from the given parameters in the dictionary.
The encoding algorithm is specified by w3c: URL-encoded form data / The application/x-www-form-urlencoded encoding algorithm
It can be implemented as follows:
First, a helper function which encodes a parameter name, respectively a parameter value:
static NSString* x_www_form_urlencoded_HTML5(NSString* s)
{
// http://www.w3.org/html/wg/drafts/html/CR/forms.html#application/x-www-form-urlencoded-encoding-algorithm , Editor's Draft 24 October 2013
CFStringRef charactersToLeaveUnescaped = CFSTR(" ");
CFStringRef legalURLCharactersToBeEscaped = CFSTR("!$&'()+,/:;=?#~");
NSString *result = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
kCFAllocatorDefault,
(__bridge CFStringRef)s,
charactersToLeaveUnescaped,
legalURLCharactersToBeEscaped,
kCFStringEncodingUTF8));
return [result stringByReplacingOccurrencesOfString:#" " withString:#"+"];
}
Finally, dataFormURLEncoded composes the character sequence of the encoded parameters. A "parameter" will be composed by concatenating the encoded name, = and encoded value:
parameter := name "=" value
Then, the parameter list will be composed by concatenating the parameters by separating them by a "&":
parameters := parameter ["&" parameter]
It can be implemented as below:
#implementation NSDictionary (FormURLEncoded)
-(NSData*) dataFormURLEncoded {
NSMutableData* data = [[NSMutableData alloc] init];
BOOL first = YES;
for (NSString* name in self) {
#autoreleasepool {
if (!first) {
[data appendBytes:"&" length:1];
}
NSString* value = self[name];
NSData* encodedName = [x_www_form_urlencoded_HTML5(name) dataUsingEncoding:NSUTF8StringEncoding];
NSData* encodedValue = [x_www_form_urlencoded_HTML5(value) dataUsingEncoding:NSUTF8StringEncoding];
[data appendData:encodedName];
[data appendBytes:"=" length:1];
[data appendData:encodedValue];
first = NO;
}
}
return [data copy];
}
#end
Note: The character sequence encodes the strings using Unicode UTF-8.
Example:
Given your parameters:
NSDictionary* params = #{#"a": #"a a", #"b": #"b+b", #"c": #"ü ö"};
NSData* encodedParamData = [params dataFormURLEncoded];
Now, encodedParamData will be added to your body whose content type is application/x-www-form-urlencoded.
The encoded parameter string becomes:
a=a+a&b=b%2Bb&c=%C3%BC+%C3%B6