Flex 4 fileReference selected image file dimmensions (width and height) - apache-flex

Question

I use a fileReference.browse() to select an image file from the harddrive.
How can I check the Width and Height of the selected image file please?
Thank you!

Answer 1

Load the fileReference.data into a Loader using loadBytes(). Then you'll have: sourceBMP:Bitmap = loader.content as Bitmap;
Here is a sample code:
MXML part:
<fx:Declarations>
<net:FileReference id="fileReference"
select="fileReference_select(event);"
complete="fileReference_complete(event);" />
</fx:Declarations>
<s:Button id="uplaodImageBtn"
label="Upload Image"
click="uplaodImageBtn_clickHandler()"/>
AS3 part:
private function uplaodImageBtn_clickHandler() : void {
var arr:Array = [];
arr.push(new FileFilter("Images", ".gif;*.jpeg;*.jpg;*.png"));
fileReference.browse(arr);
}
private function fileReference_select(evt:Event):void {
fileReference.load();
}
private function fileReference_complete(event:Event):void {
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loader_complete);
loader.loadBytes(fileReference.data);
}
public function loader_complete (event:Event) : void {
var sourceBMP:Bitmap = event.currentTarget.loader.content as Bitmap;
Alert.show(sourceBMP.width + ', ' +sourceBMP.height);
}

Answer 2

From the context of Flex, I'm pretty sure that onc you get the results back from a browserr, it is only a byteArray. In theory if you use that byteArray as the source for an image tag you'll be able to get the height and width that way, once you add that image to a container.
Otherwise, I do not believe there is an easy way to get such metadata info from local files using Flex.

Answer 3

You should be able to read the image.sourceWidth and image.sourceHeight if you wait for the image source property to update. This will give you the unscaled original values.
<fx:Script>
<![CDATA[
import mx.events.FlexEvent;
private function browseImage(event:MouseEvent):void {
var arr:Array = [];
arr.push(new FileFilter("Images", ".gif;*.jpeg;*.jpg;*.png"));
imageFileReference.browse(arr);
}
private function imageSelect(evt:Event):void {
imageFileReference.load();
}
private function imageComplete(evt:Event):void {
image.source = smallImageFileReference.data;
image.addEventListener(FlexEvent.UPDATE_COMPLETE, getImageSize);
}
private function getImageSize(evt:FlexEvent):void {
image.removeEventListener(FlexEvent.UPDATE_COMPLETE, getImageSize);
imageWidth.text = image.sourceWidth + "px";
imageHeight.text = image.sourceHeight + "px";
}
]]>
</fx:Script>
<fx:Declarations>
<net:FileReference id="imageFileReference"
select="imageSelect(event)"
complete="imageComplete(event)"/>
</fx:Declarations>
<s:VGroup width="100%" height="100%">
<s:HGroup width="100%" verticalAlign="middle">
<s:Label fontWeight="bold" text="Width:" />
<mx:Text id="imageWidth" />
</s:HGroup>
<s:HGroup width="100%" verticalAlign="middle">
<s:Label fontWeight="bold" text="Height:" />
<mx:Text id="imageHeight" />
</s:HGroup>
<s:Image id="image" maxHeight="200" maxWidth="200" />
<s:Button label="Browse for Image" click="browseImage(event)" />
</s:VGroup>