# createSnapshotOfNativeWindow returning 1x1 Image

**URL:** <https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139>\
**Category:** General JUCE discussion\
**Created:** [January 15, 2020, 11:48am UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139 "2020-01-15T11:48:21Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![piotr-piatek](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@piotr-piatek](https://forum.juce.com/u/piotr-piatek)\
**Post date:** [January 15, 2020, 11:48am UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/1 "2020-01-15T11:48:21Z")

</div>

Hi all,

Any idea why the _createSnapshotOfNativeWindow_ returns 1x1 image? I also tried with real native content component (VSTPluginWindow loaded from external .vst instead of juce::TextButton) and had **same results**. This is being called from desktop app, tested on Mac OS X, JUCE 5.4.5. Did I miss sth simple and obvious?

```auto
MessageManager::callAsync([](){ // just to avoid questions:)
     ResizableWindow window("some window",true);

     window.setVisible(true);
     window.centreWithSize(100,100);
     window.toFront(true);
                
     auto* button = new TextButton("abc");
     window.setContentOwned(button, true); // add some content just for test
     button->setBounds(0,0,50,50);
     
     DBG(window.getWidth()); // ok, gives 52 because of the content component

     auto img = createSnapshotOfNativeWindow(window.getPeer()->getNativeHandle());
     jassert(img.isValid()); // isValid returns true

     DBG(img.getWidth()); // it gives 1 - the whole img is 1x1 only
});
```

Thanks for any help!

---

<div class="post-metadata">

**Author:** ![xenakios](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/xenakios/32/4047_2.png) [@xenakios](https://forum.juce.com/u/xenakios)\
**Post date:** [January 15, 2020, 11:58am UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/2 "2020-01-15T11:58:27Z")

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At least on Windows, just changing to this at least gives the correct sized image :

```auto
auto* button = new TextButton("abc");
		button->setBounds(0, 0, 50, 50);
		window.setContentOwned(button, true); // add some content just for test
```

That is, set the content component bounds first, then attach it to the window. You should have got a jassert about that already with your own code, though…? (setContentOwned checks that the component you are setting doesn’t have a zero size.)

---

<div class="post-metadata">

**Author:** ![piotr-piatek](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@piotr-piatek](https://forum.juce.com/u/piotr-piatek)\
**Post date:** [January 15, 2020, 12:06pm UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/3 "2020-01-15T12:06:34Z")

</div>

It’s already there, I was just rewriting from my code into the juce forum to simplify things and di da mistake (obviously I would had a jassert caught when done as above!):  
 ![obraz](https://us1.discourse-cdn.com/flex026/uploads/juce/original/2X/e/e82958c779ef2d46a4a2dfc1df586f600775173e.png)

So I have now tried running the below code (literally - I copied it from here after posting to avoid further confusions), and still getting 1x1 on MacOS (Mojave):

```auto
MessageManager::callAsync([](){ // just to avoid questions:)
     ResizableWindow window("some window",true);

     window.setVisible(true);
     window.centreWithSize(100,100);
     window.toFront(true);
                
     auto* button = new TextButton("abc");
     button->setBounds(0,0,50,50);
     window.setContentOwned(button, true); // add some content just for test
     
     
     DBG(window.getWidth()); // ok, gives 52 because of the content component

     auto img = createSnapshotOfNativeWindow(window.getPeer()->getNativeHandle());
     jassert(img.isValid()); // isValid returns true

     DBG(img.getWidth()); // it gives 1 - the whole img is 1x1 only
});

```

---

<div class="post-metadata">

**Author:** ![piotr-piatek](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@piotr-piatek](https://forum.juce.com/u/piotr-piatek)\
**Post date:** [January 15, 2020, 12:59pm UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/4 "2020-01-15T12:59:22Z")

</div>

I have tried same project on different PC (this time running Mac OSX Catalina and latest XCode) - this time getting some exception (thrown when calling createSnapshotOfNativeWindow):

 ![image](https://us1.discourse-cdn.com/flex026/uploads/juce/original/2X/e/e9b4cda901dff45342fedb3beae7ffe966df9ccf.png)

---

<div class="post-metadata">

**Author:** ![xenakios](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/xenakios/32/4047_2.png) [@xenakios](https://forum.juce.com/u/xenakios)\
**Post date:** [January 15, 2020, 1:33pm UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/5 "2020-01-15T13:33:54Z")

</div>

Maybe the native window is created asynchronously, so you can’t do your things right away when the Juce window has been created?

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<div class="post-metadata">

**Author:** ![piotr-piatek](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@piotr-piatek](https://forum.juce.com/u/piotr-piatek)\
**Post date:** [January 15, 2020, 1:47pm UTC](https://forum.juce.com/t/createsnapshotofnativewindow-returning-1x1-image/37139/6 "2020-01-15T13:47:36Z")

</div>

Yeah, probably that’s the case - if I delay calling createSnapshotOfNativeWindow from window creation and showing (eg. call createSnapshotOfNativeWindow when some button is pressed), then it’s all working fine.

So I have narrowed it to the below simple code (everything is executed on the MessageQueue Thread) :

If I run this first:

```auto
            window.reset(new ResizableWindow("some window",true));
            window->centreWithSize(500,500);
            window->setVisible(true);
```

And then when some button is pressed call createSnapshotOfNativeWindow(window-\>getPeer()-\>getNativeHandle()), all is fine and working, no exceptions and Image object has proper size etc.

However, when I include everything in one call, ie.:

```auto
            window.reset(new ResizableWindow("some window",true));
            window->centreWithSize(500,500);
            window->setVisible(true);

            createSnapshotOfNativeWindow(window->getPeer()->getNativeHandle())
```

then I’m getting the previously described behaviour (1x1 size or exception thrown depending on my MacOSX/XCode versions).

Do we have any control over that? How do I find out if the native window is ready and can be manipulated? I have gone through [https://developer.apple.com/documentation/appkit/nswindow](https://developer.apple.com/documentation/appkit/nswindow) to find out Mac OS solution, but found nothing.