從UIImagePickerController發送UIImage POST到服務器？

Question

我想發送一個UIImage與UIImagePickerController服務器開機自檢以及其他相關的值。但我會在試圖到字典值@「圖像」設置爲UIImageJPEGRepresentation（圖像，1.0）行：

-(void)sendImageToServer:(UIImage *)image 
{ 
    NSOperationQueue *queue = [[NSOperationQueue alloc] init]; 
    queue.maxConcurrentOperationCount = 4; 

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration ephemeralSessionConfiguration] delegate:nil delegateQueue:queue]; 
    NSURL *uploadURL = [NSURL URLWithString:@"http://...."]; 

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:uploadURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30.0]; 

    [request addValue:@"application/json" forHTTPHeaderField:@"Accept"]; 

    [request setHTTPMethod:@"POST"]; 

    NSData *postData = [[NSData alloc] init]; 
    [postData setValue:UIImageJPEGRepresentation(image, 1.0) forKey:@"image"]; 
    [postData setValue:@"1" forKey:@"categories[0]"]; 
    [postData setValue:@"4" forKey:@"categories[1]"]; 

    NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request 
                   fromData:postData 
                 completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 

     if (!error) { 
      NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response; 
      if (httpResponse.statusCode == 200) { 
       dispatch_async(dispatch_get_main_queue(), ^{ 
        NSError *err; 
        NSDictionary *JSONDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&err]; 
        NSLog(@"HTTP 200 response: %@", JSONDict); 
       }); 
      } else {  
       NSLog(@"HTTP %ld status!", (long)httpResponse.statusCode); 
      } 
     } else { 
      NSLog(@"HTTP post image error: %@", error); 
     } 
    }]; 
    [uploadTask resume]; 
} 

JSON序列並不在這裏工作，因爲圖像是不是有效的JSON值。另一方面，如果我嘗試：

... 
NSMutableData *postData = [[NSMutableData alloc] init]; 
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:postData]; 

    [archiver encodeObject:UIImageJPEGRepresentation(image, 1.0) forKey:@"image"]; 
    [archiver encodeObject:@"1" forKey:@"categories[0]"]; 
    [archiver encodeObject:@"4" forKey:@"categories[1]"]; 
    [archiver finishEncoding]; 



    //NSData *postData = [NSJSONSerialization dataWithJSONObject:dataDict options:NSJSONWritingPrettyPrinted error:&jsonError]; 
    //Now you can post the json data 

    NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request 
                   fromData:postData 
                 completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {... 

存檔的關鍵：值對似乎沒有得到服務器。這必須是一個常規的iOS編碼任務。

即使我只是嘗試：

NSError *jsonError; 
    NSData *postData = [NSJSONSerialization dataWithJSONObject:@{@"image":@"123",@"categories[0]":@"1",@"categories[1]":@"4"} options:NSJSONWritingPrettyPrinted error:&jsonError]; 

服務器不會在所有得到任何鍵...

Answer 1

這不是NSData的正確使用。它現在正在崩潰，因爲NSData沒有密鑰命名圖像（..或其後的兩個）。你需要做的是創建一個NSDictionary，然後將其轉換爲NSData。

做這樣的事情，而不是：

NSDictionary *dictionary = [NSDictionary alloc]initWithObjectsAndKeys:image,@"image",@(1),@"categories[0]",@(4),@"categories[1]", nil]; 
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary]; //Not currently using NSJSONSerialization since you want to post a Dictionary with an invalid NSJSONSerialization type in it. 
//Now you can post the json data 

Answer 2

給人以AFNetworking一個嘗試，它有一個偉大的方式，使上傳，您可以在這裏找到樣本：https://github.com/AFNetworking/AFNetworking#creating-an-upload-task

我個人建議大家使用它，因爲我開始使用我沒有任何麻煩來與我的應用程序與網絡服務器進行通信。

Answer 3

使用AFNetworking和多部分表單文章。下面是一個粗略的例子（注意，我傳遞一個塊這樣您的實施可能會有所不同）：

AFHTTPRequestOperation *operation = [self POST:FullURLString parameters:Params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) { 
     [formData appendPartWithFileData:fileData name:fileName fileName:fileName mimeType:mimeType]; 
    } success:^(AFHTTPRequestOperation *operation, id responseObject) { 
     NSData *responseData = [operation responseData]; 
     id retObj; 
     NSError *error = nil; 
     if (responseData) { 
      retObj = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error]; 
     } 
     // Pass back the serialized object (either an NSArray of type NSDictionaries or an NSArray of type customClass) 
     block(retObj); 

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     NSLog(@"Failed with error = [Error]: %@", error); 
     block(nil); 
}];