Почему загруженное изображение не отображается правильно?

Question

Я загрузил файл изображения на сервер php, файл может быть получен на стороне сервера, но не может быть отображен в Preview, а журналы сервера не могут получить тип файла изображения, клип кода приложения:

@interface ImageUploader : NSObject <NSURLConnectionDataDelegate> 
{ 
...... 
} 

- (id)initWithURL:(NSURL*)theServerURL image:(UIImage*)theImage delegate:(id<ImageUploaderDelegate>)theDelegate; 
- (void)startUpload; 

@end 

@implementation ImageUploader 
...... 

- (void)startUpload 
{ 
    NSURLRequest *request = [self postRequestWithURL:serverURL boundry:BOUNDRY image:image]; 
    connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 
} 

#pragma mark - Private Methods 
- (NSURLRequest*)postRequestWithURL:(NSURL*)url boundry:(NSString*)theBoundry image:(UIImage*)theImage 
{ 
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30]; 
    [request setHTTPShouldHandleCookies:NO]; 
    [request setHTTPMethod:@"POST"]; 
    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", theBoundry] forHTTPHeaderField:@"Content-Type"]; 
    NSMutableData *postData = [NSMutableData data]; 
    NSData *imageData = UIImagePNGRepresentation(theImage); 
    if (imageData) { 
     [postData appendData:[[NSString stringWithFormat:@"--%@\r\n", theBoundry]dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"imageFileFromIPhoneApp.png\"\r\n\r\n", FORM_FLE_INPUT]dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postData appendData:[[NSString stringWithString:@"Content-Type: image/png\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postData appendData:imageData]; 
    } 
    [postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", theBoundry]dataUsingEncoding:NSUTF8StringEncoding]]; 
    [request setValue:[NSString stringWithFormat:@"%d", [postData length]] forHTTPHeaderField:@"Content-Length"]; 
    [request setHTTPBody:postData]; 
    return request; 
} 

@implementation WonderfulMomentViewController 
...... 
#pragma mark - UIImagePickerControllerDelegate 

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    UIImage *selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage]; 
    [picker dismissModalViewControllerAnimated:YES]; 
    // do something with selectedImage and originalImage 
    NSString *queryURL = [NSString stringWithFormat:@"%@/modules/party.php?action=uploadWonderfulImage", HOST_DOMAIN]; 
    ImageUploader *imageUploader = [[ImageUploader alloc]initWithURL:[NSURL URLWithString:queryURL] image:selectedImage delegate:self]; 
    [imageUploader startUpload]; 
} 
...... 
@end 

=============================================== 
the php code below: 

public function uploadWonderfulImage(){ 
    foreach($_FILES as $key => $value){ 
     error_log("$key=>$value"); 
     foreach($_FILES[$key] as $subkey => $subvalue){ 
      error_log("$subkey=>$subvalue"); 
     } 
    } 
    move_uploaded_file($_FILES["uploadFile"]["tmp_name"], $_FILES["uploadFile"]["name"]); 
} 

=============================================== 
the php log below:(note:the value of type is null) 

[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] uploadFile=>Array 
[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] name=>imageFileFromIPhoneApp.png 
[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] type=> 
[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] tmp_name=>/private/var/tmp/phpnbb3cf 
[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] error=>0 
[Tue May 22 09:34:43 2012] [error] [client 192.168.55.31] size=>868591 

Answer 1

Чтобы загрузить изображения с помощью POST, вам необходимо установить тип контента в приложение/октет-поток. Вот код, я использую:

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

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

NSMutableData *body = [NSMutableData data]; 

[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"file\"; filename=\"attachment.png\"r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
[body appendData:[NSData dataWithData:data]]; 
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[request setHTTPBody:body]; 

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 

EDIT: Вот PHP код, я использую:

if (isset($_FILES["uploadedfile"])) 
{ 
    echo $target_path = $target_path.basename($_FILES['uploadedfile']['name']); 
    if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) { 
     echo "1: The file ".basename($_FILES['uploadedfile']['name'])." has been uploaded"; 
    } else{ 
     echo "2: There was an error uploading the file, please try again!"; 
    } 
}