发布到服务器时iOS 4图像导向错误 [英] iOS 4 Image Oriented Incorrectly When Posted To Server

问题描述

我是一个相对较新的iOS开发人员。我正在尝试构建一个将图像上传到服务器的应用程序。但是，当我使用元数据获取图像时，方向始终关闭。这里是我使用的代码：

   - （无效）getJPEGFromAssetForURL：（NSURL *）网址{
 ALAssetsLibrary * assetslibrary = [[ALAssetsLibrary alloc] init]; 
 [assetslibrary assetForURL：url 
 resultBlock：^（ALAsset * myasset）{
 self.rep = [myasset defaultRepresentation]; 
 
 NSLog（@getJPEGFromAssetForURL：％@的默认资产表示：uti：％@ size：％lld url：％@ orientation：％d scale：％f metadata：％@，
 url，[rep UTI]，[rep size]，[rep url]，[rep orientation]，
 [rep scale]，[rep metadata]）; 
 
 
字节* buf = malloc（[rep size]）; //当关联的NSData被释放时，将自动释放
 NSError * err = nil; 
 NSUInteger bytes = [rep getBytes：buf fromOffset：0LL 
 length：[rep size] error：& err]; 
 if（err || bytes == 0）{
 // err和bytes == 0冗余？ Doc说0返回意味着
 //错误发生，这可能意味着返回NSError。 
 
 NSLog（@来自getBytes：％@的错误，错误）; 
 self.imageJPEG = nil; 
返回; 
} 
 self.imageJPEG = [NSData dataWithBytesNoCopy：buf length：[rep size] 
 freeWhenDone：YES]; // YES表示免费的malloc'ed buf在取消分配时支持这个
} 
 failureBlock：^（NSError * err）{
 NSLog（@无法获取资产％@：％@ ，url，err）; 
}]; 
 [assetslibrary release]; 
} 
  

当我继续将imageJPEG变量中包含的图像数据发布到我的网络服务器，它遇到所有元数据完整，但图像方向不正确。

我也尝试了以下相同的结果：

  UIImage * largeimage = [UIImage imageWithCGImage：iref scale：1.0 orientation：[rep orientation]]; 
 NSData * webData = UIImageJPEGRepresentation（largeimage，0.5）; 
  

这里是否有我遗漏的东西，或者这是图像存储方式的错误。如果你能以任何方式提供帮助，请告诉我。我很高兴能把这个应用程序拿出来。

非常感谢。

< DIV类= h2_lin>解决方案

的iOS的UIImagePickerController上传后的结果图片方向 - 这篇文章回答了我的问题！

I am a relatively new iOS developer. I am attempting to build an app that uploads images to a server. However, when I get the image with metadata, the orientation is always off. Here is the code I am using:

- (void)getJPEGFromAssetForURL:(NSURL *)url {
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:url
               resultBlock: ^(ALAsset *myasset) {
                   self.rep = [myasset defaultRepresentation];

                   NSLog(@"getJPEGFromAssetForURL: default asset representation for %@: uti: %@ size: %lld url: %@ orientation: %d scale: %f metadata: %@", 
                         url, [rep UTI], [rep size], [rep url], [rep orientation], 
                         [rep scale], [rep metadata]);


                   Byte *buf = malloc([rep size]);  // will be freed automatically when associated NSData is deallocated
                   NSError *err = nil;
                   NSUInteger bytes = [rep getBytes:buf fromOffset:0LL 
                                             length:[rep size] error:&err];
                   if (err || bytes == 0) {
                       // Are err and bytes == 0 redundant? Doc says 0 return means 
                       // error occurred which presumably means NSError is returned.

                       NSLog(@"error from getBytes: %@", err);
                       self.imageJPEG = nil;
                       return;
                   } 
                   self.imageJPEG = [NSData dataWithBytesNoCopy:buf length:[rep size] 
                                                   freeWhenDone:YES];  // YES means free malloc'ed buf that backs this when deallocated
               }
              failureBlock: ^(NSError *err) {
                  NSLog(@"can't get asset %@: %@", url, err);
              }];
[assetslibrary release];
}

When I go ahead and post the image data contained in the imageJPEG variable to my webserver, it comes across with all the metadata intact, but the image is oriented incorrectly.

I also tried the following with the same result:

UIImage *largeimage = [UIImage imageWithCGImage:iref scale:1.0 orientation:[rep orientation]];
NSData *webData = UIImageJPEGRepresentation(largeimage,0.5);

Is there something I'm missing here or this is a bug in the way the images are stored. Please let me know if you can help in any way, I am really excited to get this app out.

Thanks so much.

解决方案

iOS UIImagePickerController result image orientation after upload - This post answered my question!

这篇关于发布到服务器时iOS 4图像导向错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！