将图像上传到 Web 服务会导致图像损坏

Question

我正在尝试将图像从 iPhone 上传到网络服务，但即使文件成功上传，也无法查看 jpg，它似乎已损坏。

使用此 c# 代码可以成功上传文件并正常工作：

var url = http://myurl.co.uk/services/service.svc/UploadImage?id=108&ext=png;

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
req.Method = "POST";
req.ContentType = "image/jpeg";

using (var reqStream = req.GetRequestStream())
{
    var bytes = File.ReadAllBytes("C:\\Users\\Chris\\Pictures\\default.png”);
    reqStream.Write(bytes, 0, bytes.Length);
}
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

Console.WriteLine("HTTP/{0} {1} {2}", resp.ProtocolVersion, (int)resp.StatusCode, resp.StatusDescription);

但这是我在 iOS 上尝试的使文件不可见的代码：

获取图片

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    // Resize the image from the camera
    UIImage *scaledImage = [image resizedImageWithContentMode:UIViewContentModeScaleAspectFill bounds:CGSizeMake(_photo.frame.size.width/2, _photo.frame.size.height/2) interpolationQuality:kCGInterpolationHigh];
    // Crop the image to a square (yikes, fancy!)
    UIImage *croppedImage = [scaledImage croppedImage:CGRectMake((scaledImage.size.width -_photo.frame.size.width)/2, (scaledImage.size.height -_photo.frame.size.height)/2, _photo.frame.size.width, _photo.frame.size.height)];
    // Show the photo on the screen
    _photo.image = croppedImage;

    NSData *imgData=UIImageJPEGRepresentation(croppedImage,1);
    NSLog(@"Original size:%d",[imgData length]);
    NSData *smallerImage=UIImageJPEGRepresentation(croppedImage, 0.5);
    NSLog(@"End size:%d",[smallerImage length]);
    imageData = imgData;

    NSString *imageName = @"tempImage.jpg";
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString * documentsDirectoryPath = [paths objectAtIndex:0];

    NSString *dataPath = [documentsDirectoryPath  stringByAppendingPathComponent:imageName];
    NSData* settingsData = UIImageJPEGRepresentation(croppedImage, 0.5);

    [settingsData writeToFile:dataPath atomically:YES];

    [picker dismissModalViewControllerAnimated:YES];
}

上传图片：

-(void)uploadImageForOfferID:(NSString *)offerID imageExtention:(NSString *)extension withCompletionBlock:(void(^)(NSError *error))block
{
    NSString *imageName = @"tempImage.jpg";
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString * documentsDirectoryPath = [paths objectAtIndex:0];

    NSString *dataPath = [documentsDirectoryPath  stringByAppendingPathComponent:imageName];
    NSData* imageData = [NSData dataWithContentsOfFile:dataPath];

    AFHTTPClient *client = [AFHTTPClient clientWithBaseURL:[NSURL URLWithString:masterURL]];

    NSString *url = [NSString stringWithFormat:@"UploadImage?id=%@&ext=%@", offerID, extension];
    NSMutableURLRequest *request = [client multipartFormRequestWithMethod:@"POST" path:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileData:imageData name:@"photo" fileName:@"photo.jpg" mimeType:@"image/jpeg"];
    }];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
    }];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Complete");
        block(nil);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Failed");
        NSLog(@"FAILED WITH STATUS CODE %d - error description: %@", operation.response.statusCode, error.description);
        block(error);
    }];
    [operation start];
}

此方法先将图像保存到文件，然后再上传。我也尝试从NSData *smallerImage=UIImageJPEGRepresentation(croppedImage, 0.5); 上传数据，但结果相同。

我在上传时遗漏了什么吗？

谢谢

编辑----

比较模拟器中的文件和上传的文件。模拟器文件为2,538 bytes (4 KB on disk)，上传的文件稍大2,698 bytes (4 KB on disk) 原始模拟器图像显示缩略图，但上传的图像没有！ 上传的图片可以用 Photoshop 打开，但不能用 Safari 或 Chrome 打开。

Answer 1

当您在提供的代码中指向的文件实际上是.png 文件并且应该使用image/png 时，这可能与您发送image/jpeg 类型的图像有关吗？