ios - 通过POST方法发送带有图像的参数？

Question

我想发送带有参数(用户名、密码等)的图像？？以下是我的代码:

-(void) senRequestForPostAnswerWithImage:(NSString *)imageName andAnswer:(NSString *)answer andQuestionID:(NSString *)questionID
{
    NSUserDefaults *loginData = [NSUserDefaults standardUserDefaults];
    NSString *username = [loginData objectForKey:@"username"] ;
    NSString *password = [loginData objectForKey:@"password"];

    NSString *postString = [NSString stringWithFormat:@"&username=%@&password=%@&image=%@&answer=%@&question_id=%@", username, password, imageName, answer, questionID];
    NSString *urlString = @"http://myAPIName/MethodName";
    NSURL *myURL = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    NSMutableURLRequest *detailRequestToServer =[NSMutableURLRequest requestWithURL:myURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60.0];
    [detailRequestToServer setHTTPMethod:@"POST"];
    [detailRequestToServer setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    const char *utfString = [postString UTF8String];
    NSString *utfStringLenString = [NSString stringWithFormat:@"%zu", strlen(utfString)];
    [detailRequestToServer setHTTPBody:[NSData dataWithBytes: utfString length:strlen(utfString)]];
    [detailRequestToServer setValue:utfStringLenString forHTTPHeaderField:@"Content-Length"];

    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:detailRequestToServer delegate:self];
    if (theConnection)
    {
        self.responseData = [[NSMutableData alloc] init];
        [GeneralClass startHUDWithLabel:@"Loading…"];
    }
    else
        NSLog(@"Connection Failed!");
}

我知道这个网站上有很多问题，但我不知道我需要在现有代码中更改哪里以及更改什么？？

所以，请建议我需要更改现有代码以添加发送图像的功能？？

NOTE: without image this above code is working well for me.

Answer 1

我的建议是使用 AFNetworking。它将大大简化您的流程并为您节省大量时间。它是开发人员广泛使用的框架。

https://github.com/AFNetworking/AFNetworking

您可以使用几行代码轻松发送带参数的图像(POST 多部分请求):

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = @{@"foo": @"bar"};
NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];
[manager POST:@"http://example.com/resources.json" parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileURL:filePath name:@"image" error:nil];
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Success: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];