Does anyone have any experience with the Camera APIs in Flex 4.6 with iOS? I'm running into a lot of setup issues and the documentation is lacking. I'm trying to setup an image upload component where a user can either capture a new photo or choose an existing from their library.
For capturing, there seems to be a huge hang (like 10 seconds where the app just sits non-responsive) when the image is being saved as a JPEG, and I'm using the Alchemy swc.
private var cam:CameraUI;
protected function takePhotoHandler(event:MouseEvent):void
{
if(CameraUI.isSupported) {
cam = new CameraUI();
cam.addEventListener(MediaEvent.COMPLETE, mediaEventComplete);
cam.launch(MediaType.IMAGE);
}
}
protected function mediaEventComplete(e:MediaEvent):void
{
cam.removeEventListener(MediaEvent.COMPLETE, mediaEventComplete);
status.text = "Media captured..." ;
var imagePromise:MediaPromise = e.data;
var loader:Loader = new Loader();
if(imagePromise.isAsync) {
status.text = "Asynchronous media promise." ;
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, asyncImageLoadHandler);
loader.addEventListener(IOErrorEvent.IO_ERROR, asyncImageErrorHandler);
loader.loadFilePromise(imagePromise);
} else {
status.text = "Synchronous media promise.";
loader.loadFilePromise(imagePromise);
img.source = loader.content;
saveImage(loader.contentLoaderInfo);
}
}
protected function asyncImageLoadHandler(e:Event):void
{
status.text = "Media loaded in memory.";
img.source = e.currentTarget.loader.content;
saveImage(e.currentTarget.loader.contentLoaderInfo);
}
protected function saveImage(loaderInfo:LoaderInfo):void
{
if(CameraRoll.supportsAddBitmapData){
var bitmapData:BitmapData = new BitmapData(loaderInfo.width, loaderInfo.height);
bitmapData.draw(loaderInfo.loader);
d_trace("bitmapDraw");
//var c:CameraRoll = new CameraRoll();
//c.addBitmapData(bitmapData);
d_trace("writing to disk");
var f:File = File.applicationStorageDirectory.resolvePath("temp");
var stream:FileStream = new FileStream()
stream.open(f, FileMode.WRITE);
d_trace("encoding start");
var baSource: ByteArray = bitmapData.clone().getPixels( new Rectangle( 0, 0, loaderInfo.width, loaderInfo.height) );
var bytes: ByteArray = as3_jpeg_wrapper.write_jpeg_file(baSource, loaderInfo.width, loaderInfo.height, 3, 2, 80);
d_trace("encoding end");
stream.writeBytes(bytes,0,bytes.bytesAvailable);
stream.close();
d_trace(f.url);
img.source = f.url;
d_trace("UPLOADING START");
f.addEventListener(Event.COMPLETE,uploadCompleteHandler);
f.addEventListener(Event.OPEN,openUploadHandler);
f.upload(urlRequest);
}
}
For choosing from the library, I can't get a file reference to actually start the upload. When the select is made, the mediaPromise.file value is null. mediaPromise.isAsync is true and I can attach a loader listener but that only returns the contentLoaderInfo, which has no reference to the actual File or a FileRefernce, so I can't call the upload method without creating a temp image, which seems expensive and crazy.
protected function chooseImage(): void {
if(CameraRoll.supportsBrowseForImage) {
var roll: CameraRoll = newCameraRoll();
roll.addEventListener( MediaEvent.SELECT, roll_selectHandler );
var options:CameraRollBrowseOptions = new CameraRollBrowseOptions();
roll.browseForImage(options);
}}
private function roll_selectHandler( event: MediaEvent ): void
{
var imagePromise:MediaPromise = event.data;
if(imagePromise.isAsync) {
// Here's where I get. Not sure how to get the reference to the file I just selected.
}}
Any help would be appreciated.
Thanks!
I think I found a solution for works for my case so I wanted to share it in case it can help someone out. shaunhusain's post definitely got me moving in the right direction. I was able to avoid using the Alchemy swc all together which saves a TON of time in the app. The key is this AS3 library I found that formats a URLRequest in a way that mimics a standard file upload POST operation. Here's the basic outline:
I have a small component called 'status' thats an overlay with an icon and status text for the user. When a user wants to add a photo, they get a ViewMenu with the choices to get the photo from their library or take a new photo. The meat of the code is below.
//IMAGE HANDLING
//Helpful Links:
//http://www.quietless.com/kitchen/dynamically-create-an-image-in-flash-and-save-it-to-the-desktop-or-server/
//http://stackoverflow.com/questions/597947/how-can-i-send-a-bytearray-from-flash-and-some-form-data-to-php
// GET WRAPPER CLASS Here: http://code.google.com/p/asfeedback/source/browse/trunk/com/marston/utils/URLRequestWrapper.as
//This part is basically all based on http://www.adobe.com/devnet/air/articles/uploading-images-media-promise.html
protected var cameraRoll:CameraRoll = new CameraRoll();
//User choose to pick a photo from their library
protected function chooseImage():void {
if( CameraRoll.supportsBrowseForImage )
{
cameraRoll.addEventListener( MediaEvent.SELECT, imageSelected );
cameraRoll.addEventListener( Event.CANCEL, browseCanceled );
cameraRoll.addEventListener( ErrorEvent.ERROR, mediaError );
cameraRoll.browseForImage();
} else {
trace( "Image browsing is not supported on this device.");
}
}
//User choose to take a new photo!
protected var cameraUI:CameraUI = new CameraUI();
protected function captureImage():void
{
if( CameraUI.isSupported )
{
trace( "Initializing..." );
cameraUI.addEventListener( MediaEvent.COMPLETE, imageSelected );
cameraUI.addEventListener( Event.CANCEL, browseCanceled );
cameraUI.addEventListener( ErrorEvent.ERROR, mediaError );
cameraUI.launch( MediaType.IMAGE );
} else {
trace( "CameraUI is not supported.");
}
}
private function browseCanceled (e:Event):void
{
trace ("Camera Operation Cancelled");
}
private function mediaError (e:ErrorEvent):void
{
trace ("mediaError");
}
private var dataSource:IDataInput;
private function imageSelected( event:MediaEvent ):void
{
trace( "Media selected..." );
var imagePromise:MediaPromise = event.data;
dataSource = imagePromise.open();
if( imagePromise.isAsync )
{
trace( "Asynchronous media promise." );
var eventSource:IEventDispatcher = dataSource as IEventDispatcher;
eventSource.addEventListener( Event.COMPLETE, onMediaLoaded );
} else {
trace( "Synchronous media promise." );
readMediaData();
}
}
private function onMediaLoaded( event:Event ):void
{
trace("Media load complete");
readMediaData();
}
private function readMediaData():void
{
var imageBytes:ByteArray = new ByteArray();
dataSource.readBytes( imageBytes );
upload(imageBytes);
}
//OK Here's where it gets sent. Once the IDataInput has read the bytes of the image, we can send it via our custom URLRequestWrapper
//which will format the request so the server interprets it was a normal file upload. Your params will get encoded as well
//I used Uploadify this time but I've used this Wrapper class in other projects with success
protected function upload( ba:ByteArray, fileName:String = null ):void
{
if( fileName == null ) //Make a name with correct file type
{
var now:Date = new Date();
fileName = "IMG" + now.fullYear + now.month +now.day +
now.hours + now.minutes + now.seconds + ".jpg";
}
var loader:URLLoader = new URLLoader();
loader.dataFormat= URLLoaderDataFormat.BINARY;
var params:Object = {};
params.name = fileName;
params.user_id = model.user.user_id;
var wrapper:URLRequestWrapper = new URLRequestWrapper(ba, fileName, null, params);
wrapper.url = "http://www.your-domain.com/uploadify.php";
loader.addEventListener( Event.COMPLETE, onUploadComplete );
loader.addEventListener(IOErrorEvent.IO_ERROR, onUploadError );
loader.load(wrapper.request);
}
private function onUploadComplete(e:Event):void
{
trace("UPLOAD COMPLETE");
var bytes:ByteArray = e.currentTarget.data as ByteArray;
//Most likely you'd want a server response. It will be returned as a ByteArray, so you can get back to the string:
trace("RESPONSE", bytes.toString());
}
private function onUploadError(e:IOErrorEvent):void
{
trace("IOERROR", e.text);
}
来源：https://stackoverflow.com/questions/8913974/upload-library-or-captured-images-on-ios-with-flex-mobile-4-6