Question

这是我向postjs后端发送帖子请求的代码。

CLLocation* location = [locationManager location];
CLLocationCoordinate2D coord = [location coordinate];
NSMutableURLRequest *request =
[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://50.63.172.74:8080/points"]];
//[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPMethod:@"POST"];
NSDictionary* jsonDict = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:coord.latitude], @"lat", [NSNumber numberWithFloat:coord.longitude], @"lng", nil];//dictionaryWithObjectsAndKeys:coord.latitude, nil]
NSString *postString;
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict
                                                   options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
                                                     error:&error];

if (! jsonData) {
    NSLog(@"Got an error: %@", error);
} else {
   postString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
[request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
(void)[[NSURLConnection alloc] initWithRequest:request delegate:self];

使用express我将request.body返回到服务器上，但它看起来像这样：

{ '{\n  "lat" : 0.0,\n  "lng" : 0.0\n}': '' }

我只能通过说request.body.lat来访问它，因为它以未定义的形式返回。我希望身体看起来像：

{ "lat":0.0, "lng":0.0}

关于如何使用快递做任何想法？

Answer 1

愿这对你有所帮助。

请用实际坐标替换0.0

NSArray *keys = [NSArray arrayWithObjects:@"lat", @"lng", nil];
        NSArray *objects = [NSArray arrayWithObjects:@"0.0",@"0.0", nil];

        NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
        NSData *jsonData ;
        NSString *jsonString;
        if([NSJSONSerialization isValidJSONObject:jsonDictionary])
        {
            jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:nil];
            jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
        }


        NSString *requestString = [NSString stringWithFormat:
                                   @"http://50.63.172.74:8080/points"];

        NSURL *url = [NSURL URLWithString:requestString];
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        [request setHTTPMethod:@"POST"];
        [request setHTTPBody: jsonData];
        [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
        [request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];

        NSError *errorReturned = nil;
        NSURLResponse *theResponse =[[NSURLResponse alloc]init];
        NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];

        if (errorReturned) {
            NSLog(@"Error %@",errorReturned.description);
        }
        else
        {
            NSError *jsonParsingError = nil;
            NSMutableArray *arrDoctorInfo  = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];

            NSLog(@"Dict %@",arrDoctorInfo);
        }

Answer 2

问题是，在使用NSJSONSerialization获取包含JSON数据的NSData对象后，您可以从该数据创建postString。消除那个不必要的步骤，然后做：

[request setHTTPBody:jsonData];

您应该在服务器端代码中获得预期的JSON。

从iPhone Application Expressjs / Nodejs后端发送JSON帖子数据

2 个答案: