Uploading image to a server [closed]

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Closed 7 years ago.

开发者_JAVA百科 Improve this question

Could someone please suggest a good tutorial on how to upload an image from my iPhone application, to a server programmatically?

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I would recommend the following networking library

AFNetworking

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I suggest that you use the ASIHTTP Library for doing this. The sample code which comes with the library also has the appropriate examples. The library can be downloaded here : http://allseeing-i.com/ASIHTTPRequest/ .

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Process 1:

• Grab the ASIHTTPRequest api and add it to your project. see documentation here.

• import ASIFormDataRequest.h into your class and include the delegate

Use it as

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL  URLWithString:@"upload_url"]];
request.delegate = self;
[request setFile:@"your_image_name.jpg" forKey:@"photo"];
 // or [request setFile:@"your_image_name.jpg" withFileName:@"image_name_for_server.jpg" andContentType:@"image/jpeg" forKey:@"photo"];
[request startAsynchronous];

To get acknowledgement implement delegate methods, like

- (void)uploadRequestFinished:(ASIHTTPRequest *)request
{
  NSLog(@"File upload successful"); 
}

- (void)uploadRequestFailed:(ASIHTTPRequest *)request
{ 
  NSLog(@" Error: file upload failed. Issue: \"%@\"",[[request error] localizedDescription]); 
}

N.B.: If you face the ARC problem, then simply goto the Xcode's File -> Refactor and select Convert to Objective-C ARC...

OR

Goto Project -> Targets -> Built Phases -> Compile Sources, select the Files and double click on the selected files. Write -fno-objc-arc.

Process 2:

An up-to-date way of doing so is using AFNetworking. API can be download from here

To upload image, write

//Create http client
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"/*server_url*/"]];
//convert image to data
NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"your_image_name.jpg"], 0.5/*this is compressionQuality, 0.5 will reduce the image into half*/);

// for PNG image, NSData *imageData = UIImagePNGRepresentation(([UIImage imageNamed:@"your_image_name.png"]); // it doesn't support compression

//add image data to the request
NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST"
                                                                     path:@"/upload"
                                                               parameters:nil
                                                constructingBodyWithBlock: ^(id <AFMultipartFormData>formData)
                                                                           {
                                                                              [formData appendPartWithFileData:imageData 
                                                                                                          name:@"image_name_for_server" 
                                                                                                      fileName:@"image_name_for_server.jpg" 
                                                                                                      mimeType:@"image/jpeg"];
                                                                           }
                              ];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite)
                                     {
                                       //this where you can monitor your upload progress
                                       NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
                                     }
];

[httpClient enqueueHTTPRequestOperation:operation];