问题
Most of the information here refers to the abandoned ASIHTTPREQUEST project so forgive me for asking again.
Effectively, I need to swipe a magnetic strip and send the track 2 data to a webservice that returns "enrolled" or "notenrolled" (depending on the status of the card...)
So my data comes in simply as
NSData *data = [notification object];
And then I need to pass this to a url to the order of
http://example.com/CardSwipe.cfc?method=isenrolled&track2=data
And then just receive a response string...
I've searched a ton and there seems to be some conflicting answers as to whether this should be accomplished simply with AFNetworking, RESTkit, or with the native NSURL/NSMutableURLRequest protocols.
回答1:
The options for performing HTTP requests in Objective-C can be a little intimidating. One solution that has worked well for me is to use NSMutableURLRequest. An example (using ARC, so YMMV) is:
- (NSString *) getDataFrom:(NSString *)url{
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"GET"];
[request setURL:[NSURL URLWithString:url]];
NSError *error = nil;
NSHTTPURLResponse *responseCode = nil;
NSData *oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseCode error:&error];
if([responseCode statusCode] != 200){
NSLog(@"Error getting %@, HTTP status code %i", url, [responseCode statusCode]);
return nil;
}
return [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
}
Update:
Your question's title, and tagging say POST, but your example URL would indicate a GET request. In the case of a GET request, the above example is sufficient. For a POST, you'd change it up as follows:
- (NSString *) getDataFrom:(NSString *)url withBody:(NSData *)body{
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:body];
[request setValue:[NSString stringWithFormat:@"%d", [body length]] forHTTPHeaderField:@"Content-Length"];
[request setURL:[NSURL URLWithString:url]];
/* the same as above from here out */
}
回答2:
Update for iOS 9:
So, [NSURLConnection sendSynchronousRequest] is deprecated starting from iOS 9. Here's how to do a GET request using NSURLSession starting from iOS 9
GET Request
// making a GET request to /init
NSString *targetUrl = [NSString stringWithFormat:@"%@/init", baseUrl];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"GET"];
[request setURL:[NSURL URLWithString:targetUrl]];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:
^(NSData * _Nullable data,
NSURLResponse * _Nullable response,
NSError * _Nullable error) {
NSString *myString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Data received: %@", myString);
}] resume];
POST Request
// making a POST request to /init
NSString *targetUrl = [NSString stringWithFormat:@"%@/init", baseUrl];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
//Make an NSDictionary that would be converted to an NSData object sent over as JSON with the request body
NSDictionary *tmp = [[NSDictionary alloc] initWithObjectsAndKeys:
@"basic_attribution", @"scenario_type",
nil];
NSError *error;
NSData *postData = [NSJSONSerialization dataWithJSONObject:tmp options:0 error:&error];
[request setHTTPBody:postData];
[request setHTTPMethod:@"POST"];
[request setURL:[NSURL URLWithString:targetUrl]];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:
^(NSData * _Nullable data,
NSURLResponse * _Nullable response,
NSError * _Nullable error) {
NSString *responseStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Data received: %@", responseStr);
}] resume];
回答3:
Tested 100% working
Only for Objective C
-(void)fetchData
{
NSURLSessionConfiguration *defaultSessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration:defaultSessionConfiguration];
// Setup the request with URL
NSURL *url = [NSURL URLWithString:@"https://test.orgorg.net/ios/getStory.php?"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
// Convert POST string parameters to data using UTF8 Encoding
NSString *postParams = @"";
NSData *postData = [postParams dataUsingEncoding:NSUTF8StringEncoding];
// Convert POST string parameters to data using UTF8 Encoding
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:postData];
// Create dataTask
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSDictionary *results = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
//JSON Parsing....
NSString *message = results[@"Message"];
BOOL status = results[@"Status"];
if (status){
// Here you go for data....
}else{
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"App"
message:message
preferredStyle:UIAlertControllerStyleAlert]; // 1
UIAlertAction *firstAction = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
NSLog(@"You pressed button one");
}]; // 2
[alert addAction:firstAction]; // 4
[self presentViewController:alert animated:YES completion:nil];
}
}];
// Fire the request
[dataTask resume];
}
回答4:
**Simply Call and get your JSON Data.**
-(void)getJSONData
{
NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/us/rss/topaudiobooks/limit=10/json"];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *data = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSError *erro = nil;
if (data!=nil) {
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&erro ];
if (json.count > 0) {
for(int i = 0; i<10 ; i++){
[arr addObject:[[[json[@"feed"][@"entry"] objectAtIndex:i]valueForKeyPath:@"im:image"] objectAtIndex:0][@"label"]];
}
}
}
dispatch_sync(dispatch_get_main_queue(),^{
[table reloadData];
});
}];
[data resume];
}
来源：https://stackoverflow.com/questions/9404104/simple-objective-c-get-request