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Author Topic: Slack/Teams/Zoom application screen sharing  (Read 911 times)

stoffman

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Slack/Teams/Zoom application screen sharing
« on: December 01, 2022, 05:29:05 pm »
Hi,

On Zoom, Teams and Slack when a user wishes to share and application that was written in Lazarus (just the application, not the entire screen) he sees black screen in the share menu and when doing the actual share the users on the end sees a black screen while the sharing user sees everything as normal.

I believe the cause of that behavior is TApplication which uses a hidden window which Slack/Teams/Zoom are actually trying to share.

Any ideas how to overcome this issue?

Thanks

jamie

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Re: Slack/Teams/Zoom application screen sharing
« Reply #1 on: December 01, 2022, 06:02:13 pm »
Greate security, isn't it! :D
The only true wisdom is knowing you know nothing

Renat.Su

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Re: Slack/Teams/Zoom application screen sharing
« Reply #2 on: December 01, 2022, 07:48:55 pm »
I noticed the same behavior in Telegram messenger window sharing.
I'll keep an eye on the topic

Renat.Su

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Re: Slack/Teams/Zoom application screen sharing
« Reply #3 on: December 01, 2022, 07:50:23 pm »
Although not always. I don't see any patterns yet

tr_escape

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Re: Slack/Teams/Zoom application screen sharing
« Reply #4 on: December 01, 2022, 08:37:42 pm »
@stoffman,

could you please share a screen capture about of this issue?

Renat.Su

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Re: Slack/Teams/Zoom application screen sharing
« Reply #5 on: December 03, 2022, 05:17:07 pm »
@stoffman,

could you please share a screen capture about of this issue?
There's just a black screen

stoffman

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Re: Slack/Teams/Zoom application screen sharing
« Reply #6 on: December 03, 2022, 07:31:30 pm »
@tr_escape
Next time I'll have a call I'll take a screenshot.

But it is really just a black screen. nothing more nothings less

jamie

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Re: Slack/Teams/Zoom application screen sharing
« Reply #7 on: December 03, 2022, 07:36:08 pm »
Most likely because Lazarus creates a main application window that does nothing but handle messages and other things.

 Unless I missed something, that would be it.

  There is however the chance that somehow a security blanket is being set on the app because this can be done with other apps where it shows blank/black screens, and I don't remember the API calls for that, but they started I believe sometime in Windows 7 or maybe Vista.
« Last Edit: December 03, 2022, 09:07:40 pm by jamie »
The only true wisdom is knowing you know nothing

stoffman

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Re: Slack/Teams/Zoom application screen sharing
« Reply #8 on: December 09, 2022, 10:45:29 am »
I'm attaching an image for future reference. I also believe it has todo with the main application window as I said in the original post.


tr_escape

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Re: Slack/Teams/Zoom application screen sharing
« Reply #9 on: December 12, 2022, 08:54:55 am »
I'm attaching an image for future reference. I also believe it has todo with the main application window as I said in the original post.

Did you try this solution?

https://support.zoom.us/hc/en-us/articles/202082128-Troubleshooting-black-screen-during-screen-sharing

jamie

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Re: Slack/Teams/Zoom application screen sharing
« Reply #10 on: December 12, 2022, 08:11:19 pm »
Do Delphi generated apps show ?
The only true wisdom is knowing you know nothing

Renat.Su

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Re: Slack/Teams/Zoom application screen sharing
« Reply #11 on: December 26, 2022, 01:37:00 pm »
I'm attaching an image for future reference. I also believe it has todo with the main application window as I said in the original post.

Did you try this solution?

https://support.zoom.us/hc/en-us/articles/202082128-Troubleshooting-black-screen-during-screen-sharing
The problem is common for any software to share their screen

jamie

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Re: Slack/Teams/Zoom application screen sharing
« Reply #12 on: December 26, 2022, 02:09:11 pm »
They call that security! You wouldn't want your finance app to be viewable, would you?

The security is so good, even you can't see your own apps! :D
The only true wisdom is knowing you know nothing

Renat.Su

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Re: Slack/Teams/Zoom application screen sharing
« Reply #13 on: December 26, 2022, 02:53:47 pm »
They call that security! You wouldn't want your finance app to be viewable, would you?

The security is so good, even you can't see your own apps! :D
On the one hand, you are right. It's good. On the other hand, it is difficult to save video, provide tech support etc )

 

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