Question

I have a XULRunner application that needs to copy image data to the clipboard. I have figured out how to handle copying text to the clipboard, and I can paste PNG data from the clipboard. What I can’t figure out is how to get data from a data URL into the clipboard so that it can be pasted into other applications.

This is the code I use to copy text (well, XUL):

var transferObject=Components.classes['@mozilla.org/widget/transferable;1'].     createInstance(Components.interfaces.nsITransferable);  var stringWrapper=Components.classes['@mozilla.org/supports-string;1'].     createInstance(Components.interfaces.nsISupportsString);  var systemClipboard=Components.classes['@mozilla.org/widget/clipboard;1'].     createInstance(Components.interfaces.nsIClipboard);  var objToSerialize=aDOMNode;  transferObject.addDataFlavor('text/xul');  var xmls=new XMLSerializer(); var serializedObj=xmls.serializeToString(objToSerialize);  stringWrapper.data=serializedObj;  transferObject.setTransferData('text/xul',stringWrapper,serializedObj.length*2); 

And, as I said, the data I’m trying to transfer is a PNG as a data URL. So I’m looking for the equivalent to the above that will allow, e.g. Paint.NET to paste my app’s data.

Answer 1

Here’s a workaround that I ended up using that solves the problem pretty well. The variable dataURL is the image I was trying to get to the clipboard in the first place.

var newImg=document.createElement('img'); newImg.src=dataURL;  document.popupNode=newImg;  var command='cmd_copyImageContents'  var controller=document.commandDispatcher.getControllerForCommand(command);  if(controller && controller.isCommandEnabled(command)){     controller.doCommand(command); } 

That copies the image to the clipboard as an ‘image/jpg’.