Image upload in iphone [closed]

问题:

I am new in Iphone development. I want to upload image from Iphone library to a server. I want to take a button on screen, by clecking button user can see the image files and select one file which user want. After selecting file I want to show the image in image view.
How to do it. How to use ImageViewController?

Thanks,
Avinash Patil.

回答1:

first u have to get image form photo library for that use below code.

                   - (IBAction)BrowseImage:(id)sender {

if ([UIImagePickerController isSourceTypeAvailable:
     UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
    UIImagePickerController *imagePicker =
    [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.sourceType = 
    UIImagePickerControllerSourceTypePhotoLibrary;
    imagePicker.mediaTypes = [NSArray arrayWithObjects:
                              (NSString *) kUTTypeImage,
                              nil];
    imagePicker.allowsEditing = NO;
    [self presentModalViewController:imagePicker animated:YES];
    //newMedia = NO;

  }

  }
         -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
         {
       [self dismissModalViewControllerAnimated:YES];

         }

after selecting image u have send that image to server using http post method

here is code

                  NSString *urlString = @"your Url";
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

NSMutableData *body = [NSMutableData data];


NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];

// file
NSData *imageData = UIImageJPEGRepresentation([self scaleAndRotateImage:Mainimage.image],90);


[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[[NSString stringWithString:@"Content-Disposition: attachment; name=\"user_photo\"; filename=\"photoes.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"%@.jpg\"\r\n",@"ImageNmae"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];




// Text parameter1
// NSString *param1 = @"parameter text";
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"title\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:ImageTitel.text] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];


// close form
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// set request body
[request setHTTPBody:body];

回答2:

Use UIImagePickerController and its delegate method, and Implement UIImagePickerControllerDelegate in your controller's .h file

Just write this code for your button click

-(IBAction)btnTapped:(id)sender
{
        UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
        imgPicker.delegate = self;
        imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:imgPicker animated:YES];
} 

When you click on this button UIImagePickercontroller will load, Select any image you want, This delegate method of UIImagePickerController will called

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissModalViewControllerAnimated:YES];
    [picker release];
    //This is selected image
    UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];
    YOURIMAGEVIEW.image = img;
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissModalViewControllerAnimated:YES];
    [picker release];
}

Now search on ASIHttpRequest for how to upload images to webserver... Try some Googling..