iPhone上的图片上传

Question

我是Iphone开发新手。我想从Iphone库上传图片到服务器。 我想在屏幕上按下按钮，用户可以看到图像文件并选择一个用户想要的文件。选择文件后，我想在图像视图中显示图像。
如何做到这一点。如何使用ImageViewController？

谢谢，
Avinash Patil。

Answer 1

首先你必须得到图像形式的图片库使用下面的代码。

    - (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]; 

     } 

选择图像后u必须使用HTTP POST方法

在这里，图像发送到服务器代码

    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]; 

Answer 2

使用的UIImagePickerController及其委托的方法，并在控制器的.h文件中实现UIImagePickerControllerDelegate

只写你的按钮，该代码点击

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

当你点击这个按钮的UIImagePickerController将加载，选择任何你想要的图像，这个UIImagePickerController的代表方法将被称为

- (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]; 
} 

现在s搜索ASIHttpRequest如何上传图像到网络服务器...尝试一些 谷歌搜索..