我想使用目标 c 将带有其他参数的图像上传到服务器

Posted 2023-03-07

【中文标题】我想使用目标 c 将带有其他参数的图像上传到服务器

【英文标题】：I want to upload image with other parameters to server using objective c

【发布时间】：2018-06-22 07:46:23

【问题描述】：

我是 ios 新手，我遇到了必须将图像上传到服务器的情况。这是在 post 方法中所做的事情。

- (IBAction)submitClicked:(UIButton *)sender 

    NSDictionary *inputData = [NSDictionary dictionaryWithObjectsAndKeys:myImage,@"coverPic", nil];

NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:nil delegateQueue:nil];
NSURL *url = [NSURL URLWithString:@"http://api.mapartment.in/index.php/events/create"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:70.0];

[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request addValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setHTTPMethod:@"POST"];

NSData *jsonInputData = [NSJSONSerialization dataWithJSONObject:inputData options:NSJSONWritingPrettyPrinted error:&error];

NSString *jsonInputString = [[NSString alloc] initWithData:jsonInputData encoding:NSUTF8StringEncoding];

[request setHTTPBody:[jsonInputString dataUsingEncoding:NSUTF8StringEncoding]];

NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)


    dispatch_async(dispatch_get_main_queue(), ^

        NSDictionary *jsondictcity_name = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];

        if([[jsondictcity_name valueForKey:@"result"] isEqual:@"true"])

            NSLog(@"Success");

        

        else

            NSLog(@"Try Again");
        

        [self.view resignFirstResponder];

    );


                                      ];
[postDataTask resume];

附： _localFilePath 包含 - /Users/appcode/Library/Developer/CoreSimulator/Devices/3C3567B8-03BC-4233-B0BC-97E3899D0AAA/data/Containers/Data/Application/3D574024-42FB-4305-807A-ACC3C128383F/Documents/png

【问题讨论】：

我认为您首先需要使用路径获取图像

在附言中我正在获取图像的路径，并将该路径存储在 _localFilePath （NSString 类型）中并使用键 @"coverPic"

传递它

【参考方案1】：

图像不会与其他参数一起传递，您必须将图像转换为NSData

   UIImage *yourImage= [UIImage imageNamed:@"image.png"];
   NSData *imageData = UIImagePNGRepresentation(yourImage);
   NSString *postLength = [NSString stringWithFormat:@"%d", [imageData length]];

然后在请求中传递这些数据

 [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
 [request setHTTPBody:imageData];

和其他参数作为json传递。

从路径获取 UIImage 使用

 UIImage *yourImage = [UIImage imageWithContentsOfFile: imageFilePath]; 

【讨论】：

我明白了这个概念，但对代码的放置位置感到困惑。所以你能帮我用你建议的图片上传方法编辑我上面的代码吗，因为你可以看到我有一个名为-coverPic的键。感谢您的回复

【参考方案2】：

- (IBAction)submitClicked:(UIButton *)sender 
    UIImage* image = [UIImage imageWithContentsOfFile:_localFilePath];
    NSString *myImage = [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
    NSDictionary *inputData = [NSDictionary dictionaryWithObjectsAndKeys:myImage,@"coverPic",@"POEM WRITING",@"title",@"Bring your own paper",@"desc", nil];

    NSError *error;
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:nil delegateQueue:nil];
    NSURL *url = [NSURL URLWithString:@"http://api.mapartment.in/index.php/events/create"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
    cachePolicy:NSURLRequestUseProtocolCachePolicy
    timeoutInterval:70.0];

    [request addValue:@"multipart/form-data" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setHTTPMethod:@"POST"];

    NSData *jsonInputData = [NSJSONSerialization dataWithJSONObject:inputData options:NSJSONWritingPrettyPrinted error:&error];

    NSString *jsonInputString = [[NSString alloc] initWithData:jsonInputData encoding:NSUTF8StringEncoding];

    [request setHTTPBody:[jsonInputString dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)


    dispatch_async(dispatch_get_main_queue(), ^

    NSDictionary *jsondictcity_name = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];

    if([[jsondictcity_name valueForKey:@"result"] isEqual:@"true"])

    NSLog(@"Success");

    

    else

    NSLog(@"Try Again");
    

    [self.view resignFirstResponder];

    );
    

    ];
    [postDataTask resume];

    

【讨论】：

那么用@"coverPic" 键附加什么？

应用崩溃上线 - [NSString stringWithString: _localFilePath] ];出现错误 - 由于未捕获的异常 'NSInvalidArgumentException' 导致应用程序终止，原因：'*** -[NSPlaceholderString initWithString:]: nil argument' BTW 感谢您的支持

好吧，我认为上传正在发生，因为得到的响应是在 20-30 秒之后，但是当我在邮递员上检查 api 时，coverPic 参数显示为零

是否收到任何响应，例如成功或失败？

我正在成功阻止，但是当我检查列表 API 时，我发现 coverPic 参数为空，这意味着图像没有上传。