我正在尝试从iPhone上传图片到Web服务，但即使文件已成功上传，JPG也无法查看，似乎已损坏。
使用以下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);
以下是我在iOS上尝试的代码，但它无法查看文件：
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中，然后再上传。 我还尝试仅上传来自
NSData *smallerImage = UIImageJPEGRepresentation(croppedImage, 0.5); 的数据，但结果相同。上传时是否有遗漏？
谢谢
编辑 ----
比较模拟器文件和上传的文件。 模拟器文件为
2,538字节（磁盘上的4 KB），上传的文件略大于2,698字节（磁盘上的4 KB）。原始模拟器图像显示缩略图，但上传的图像没有！上传的图像可以在Photoshop中打开，但不能在Safari或Chrome中打开。
var bytes = File.ReadAllBytes("C:\\Users\\Chris\\Pictures\\default.png”);看起来你在iOS中的临时图像是JPG格式。 - propstm