如何在 AFMultipartFormData AFNetworking 3 中发送参数中的键

Question

这是我发送请求的方式：

NSString *string = [NSString stringWithFormat:@"%@/API/Upload",BaseURLString];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager setRequestSerializer:[AFHTTPRequestSerializer serializer]];
    [manager setResponseSerializer:[AFHTTPResponseSerializer serializer]];
    NSError *error;
manager.responseSerializer.acceptableContentTypes = nil;
for(NSData *eachImage in self.fetchedAtt) {
NSString *mystring = @"786";
        NSURLRequest *request = [manager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:string parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[formData appendPartWithFormData:eachImage name:@"myImage"];
            [formData appendPartWithFormData:[mystring dataUsingEncoding:NSUTF8StringEncoding]
                                        name:@"PracticeCode"];
} error:&error];

        NSURLSessionDataTask *task = [manager dataTaskWithRequest:request uploadProgress:nil downloadProgress:nil completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
            if (error) {
                NSLog(@"%@", error.localizedDescription);
                return;
            }

            NSLog(@"%@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
        }];
        [task resume];
    }
}

有时我得到：

{ "Message": "Error writing MIME multipart body part to output stream." }

//这是一个500错误有时我得到

Request failed: unsupported media type (415)

Answer 1

试试这个 Afnetworking 3.0

 NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString: [NSString stringWithFormat:@"%@/API/Upload",BaseURLString]; parameters:@{@"text":@"name"} constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

         [formData appendPartWithFileData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imageurl]] name:@"bizcard" fileName:@"Businesscard.jpg" mimeType:@"image/jpeg"]; // you file to upload
        } error:nil];

    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    NSURLSessionUploadTask *uploadTask;
    uploadTask = [manager
                  uploadTaskWithStreamedRequest:request
                  progress:^(NSProgress * _Nonnull uploadProgress) {
                      dispatch_async(dispatch_get_main_queue(), ^{
                      });
                  }
                  completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
                      if (error) {
                          NSLog(@"Error: %@", [[NSString alloc]initWithData:[[error valueForKey:@"userInfo"] valueForKey:@"com.alamofire.serialization.response.error.data"] encoding:NSUTF8StringEncoding]);
                          callback(NO,nil);
                          [UtilityClass removeActivityIndicator];

                      } else {
                          callback(YES,responseObject);
                      }
                  }];

    [uploadTask resume];

Answer 2

您正在尝试在单个多格式请求中发送多个文件。 Multipart 不是这样工作的。您必须一次对 1 个文件发出多个多部分请求。所以考虑你有 20 个文件。您将创建一个异步任务，一次获取一个文件，上传它，然后对下一个文件再次执行相同的功能。

如果你想保留引用，你应该 return 来自后端的文件 ID，然后将所有 ID 附加到一个数组中，并将该数组作为参数发送到一个单独的 api 请求 link 包含任何对象的文件。希望这是有道理的。

如何在 AFMultipartFormData AFNetworking 3 中发送参数中的键

How to send a key in parameter in AFMultipartFormData AFNetworking 3

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multipartform-data

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