我想读本地加载图像的宽度和高度。这似乎工作图像，不超过的限制与Flash Player 10（ HTTP尺寸： //kb2.adobe.com/cps/496/cpsid_49662.html ），但只要图像越大，宽度和高度仍然是0。奇怪的是，现在，然后，我的可阅读这些大图像的尺寸，但大多数时候并非如此。据我所知，这可能是由于播放器的限制，但我至少希望错误是一致的。

我要核对一下，因为在加载这么大的图像，因为它不会显示反正没什么用，但它是很好的提供了详细的错误信息给用户。

对此有何想法？

下面是我用本地加载图像并读取尺寸的code：

 私有函数chooseImageButton_clickHandler（事件：事件）：无效{
  VAR allowedTypes：字符串=* .JPG; * PNG。
  m_uploadFileReference =新的FileReference（）;
  m_uploadFileReference.addEventListener（Event.SELECT，uploadFileReference_selectHandler）;
  m_uploadFileReference.addEventListener（引发Event.COMPLETE，uploadFileReference_completeHandler）;
  m_uploadFileReference.browse（[新的FileFilter（图像文件（+ allowedTypes +），allowedTypes）]）;
}

私有函数uploadFileReference_selectHandler（事件：事件）：无效{
  m_uploadFileReference.load（）;
}

私有函数uploadFileReference_completeHandler（事件：事件）：无效{
  VAR装载机：装载机=新的Loader（）;
  loader.contentLoaderInfo.addEventListener（引发Event.COMPLETE，onImageLoaded）;
  loader.loadBytes（m_uploadFileReference.data）;
}

私有函数onImageLoaded（五：事件）：无效{
  跟踪（e.target.content.width）;
}
 

解决方案

您可以跳过加载整个形象，只是阅读本类。

  VAR JE：JPGSizeExtractor =新JPGSizeExtractor（）;
je.addEventListener（JPGSizeExtractor.PARSE_COMPLETE，sizeHandler）;
je.extractSize（your_jpg_file.jpg）;

功能sizeHandler（五：事件）：无效{
跟踪（尺寸+ je.width +X+ je.height）;
}
 

应速度更快和更可靠。

I'm trying to read the width and height of a locally loaded image. This seems to work for images that do not exceed the dimensions limited by the Flash Player 10 (http://kb2.adobe.com/cps/496/cpsid_49662.html), but as soon as the images are bigger, the width and height remain 0. The strange thing is that now and then, I can read the dimension of these bigger images, but most of the times not. I understand that this might be because of the player limitation, but then I would at least expect the error to be consistent.

I want to check this since there is no use in loading such a big image as it will not be displayed anyway, but it would be good to provide a detailed error message to the user.

Any ideas on this?

Here's the code that I use to load the image locally and read the dimension:

private function chooseImageButton_clickHandler(event:Event):void {
  var allowedTypes:String = "*.jpg;*.png";
  m_uploadFileReference = new FileReference();
  m_uploadFileReference.addEventListener(Event.SELECT, uploadFileReference_selectHandler);
  m_uploadFileReference.addEventListener(Event.COMPLETE, uploadFileReference_completeHandler);
  m_uploadFileReference.browse([new FileFilter("Image Files (" + allowedTypes + ")", allowedTypes)]);
}

private function uploadFileReference_selectHandler(event:Event):void {
  m_uploadFileReference.load();
}

private function uploadFileReference_completeHandler(event:Event):void {
  var loader:Loader = new Loader();
  loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onImageLoaded);
  loader.loadBytes(m_uploadFileReference.data);
}

private function onImageLoaded(e:Event):void {
  trace(e.target.content.width);
}

You can skip loading the entire image and just reading the headers with this class.

var je : JPGSizeExtractor = new JPGSizeExtractor( );
je.addEventListener( JPGSizeExtractor.PARSE_COMPLETE, sizeHandler );
je.extractSize( your_jpg_file.jpg );
 
function sizeHandler( e : Event ) : void {
    trace( "Dimensions: " + je.width + " x " + je.height );
}

Should be both faster and more reliable.