为啥我无法正确获取图像数据或无法将数据发送到服务器？

Posted 2023-03-11

【中文标题】为啥我无法正确获取图像数据或无法将数据发送到服务器？

【英文标题】：Why i am not getting image data properly or unable to send data to server?为什么我无法正确获取图像数据或无法将数据发送到服务器？

【发布时间】：2016-12-28 10:26:31

【问题描述】：

我正在尝试在我的UIViewController 中显示来自服务器端的所有数据。我在我的项目中使用AFNetworking。我将使用POST 方法将参数发送到服务器。我得到了服务器的响应，我能够显示所有数据，例如：姓名、电子邮件、wellness_id、手机和图像。我得到了图像 URL，并将其显示在 UIImageView 中。

我的要求 - 当用户单击编辑图像按钮时，他可以从设备中选择图像并将更改发送到服务器。

我做了什么：当用户点击编辑图片按钮时，我可以从设备中获取图片，并且可以在UIImageView中设置。

我的问题是，为什么它不向服务器发送任何数据？？意味着我可以从设备中设置UIImageView 中的图像，但是NSLog(@"imgdata:%@",imgdata); 这不是被调用的？？？？ 请在这个问题上帮助我。我试过这样：

[manager POST:Loginurl parameters:params progress:nil success:^(NSURLSessionTask *task, id responseObject) 

    NSLog(@"Response from server  :  %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
    NSError *error;

    NSArray *temp = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:&error];

    _exceptionstr = [[temp objectAtIndex:0] valueForKey:@"exception"];
    _wellnessidstr = [[temp objectAtIndex:0] valueForKey:@"wellness_id"];
    _namestr = [[temp objectAtIndex:0] valueForKey:@"name"];
    _emailstr = [[temp objectAtIndex:0] valueForKey:@"email_id"];
    _mobilestr = [[temp objectAtIndex:0] valueForKey:@"mobile_no"];

    _imagestr=[[temp objectAtIndex:0]valueForKey:@"profile_pic"];

    NSString *imgURL = [NSString stringWithFormat:@"%@",_imagestr];

    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imgURL]];

    dispatch_async(dispatch_get_main_queue(), ^
        [_image setImage:[UIImage imageWithData:data]];
    );


    NSLog(@"abcde:::: %@,%@,%@,%@,%@",_namestr,_wellnessidstr,_emailstr,_mobilestr,_imagestr);

    _name.text=[NSString stringWithString:_namestr];
    NSLog(@"%@",_name.text);


    _mobile.text=[NSString stringWithFormat:@"%@",_mobilestr];

    _email.text=[NSString stringWithString:_emailstr];
    NSLog(@"%@",_email.text);

    _wellness_id.text=[NSString stringWithString:_wellnessidstr];
    NSLog(@"%@",_wellness_id.text);

用于从设备获取图像并将更改发送到服务器：

- (IBAction)changeImage:(id)sender 
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

    imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;

    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    imagePickerController.delegate = self;

    [self presentViewController:imagePickerController animated:YES completion:nil];




- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

    UIImage *imageimg = [info valueForKey:UIImagePickerControllerOriginalImage];

    [_image setImage:imageimg];

    NSData *imgdata = UIImagePNGRepresentation(_image.image);

    NSLog(@"imgdata:%@",imgdata);

    AppDelegate *del = [[UIApplication sharedApplication] delegate];


    NSString *Loginurl = [NSString stringWithFormat:@"%@/EditProfiles/Pic",del.Root_URL];

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    NSString *t = [prefs stringForKey:@"token"];
    NSLog(@"%@",t);


    NSDictionary *params = @@"token":t,

                             @"profile_pic":imgdata

                             ;

    //here we can see parameters which is sent to server


    NSLog(@"Sent parameter to edit image server : %@",params);



    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];


    manager.responseSerializer = [AFHTTPResponseSerializer serializer];


    AFSecurityPolicy* policy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];

    [policy setValidatesDomainName:NO];

    [policy setAllowInvalidCertificates:YES];


    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html", nil];

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/html",nil];

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/plain",nil];



    [manager POST:Loginurl parameters:params progress:nil success:^(NSURLSessionTask *task, id responseObject) 


        // Here we can see response which is coming from server

        NSLog(@"Response from server  :  %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);

【问题讨论】：

my problem is, why it not send any data to server?? 请澄清这一点。

表示在 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info -------- up to this [_image setImage:imageimg];它可以工作，它在 UIImageView 中显示图像，但是 NSLog(@"imgdata:%@",imgdata);没有被调用.... @vaibhav

检查我的回答并告诉我您的反馈。

你想把你的图片作为 NSData 发布到服务器吗？

是的...@DipankarDas

【参考方案1】：

只需配置您的 UIImagePickerController 内部按钮操作，然后尝试。

- (IBAction)changeImage:(id)sender 

   UIImagePickerController *picker = [[UIImagePickerController alloc] init];
   picker.delegate = self;
   picker.allowsEditing = YES;
   picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
   [self presentViewController:picker animated:YES completion:NULL];

您可以使用下面的didFinishPickingMediaWithInfo委托方法获取图像数据：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 

   UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
   NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(chosenImage)];
   NSLog(@"imgdata:%@",imageData);

   self.yourImageView.image = chosenImage;
   [picker dismissViewControllerAnimated:YES completion:NULL];

【讨论】：

比以前更好的东西.....现在我发生了 2 个问题---> 1] 现在它像 imgdata 一样打印： 2] 当我选择图像时它只打印 imgdata:，但是为什么 UIImageView 中没有设置图片？？？

@SurajSukale 然后您需要将图像设置为 imageView，检查更新的 ans。

是的，我已经尝试过 [_image setImage:chosenImage];这样，现在也使用这个 self.yourImageView.image = selectedImage;但图像没有显示在 UIImageView 中。

imageView 的连接插座一切正常，先生，因为它以前对我有用，只是没有得到 imagedata，现在我明白了，但图像没有显示在 UIImageView 中，而且 imagedata 只是 .. ..??

实际上问题出在您的didFinishPickingMediaWithInfo 方法中，您在此方法中做了更多的事情，只需从内部删除其他代码并创建差异模块来处理其他任务。