TakeSnapshot

[brche]

Not a big problem; but your procedure to take a Snapshot in the MiniBrowser demo is named akeSnapShot. I think it should be TakeSnapShot

Brian

[salvadordf]

Fixed a couple of typos in that demo. Thanks!

[brche]

I noticed that you are using uWVBrowser.CapturePreview, instead of uWVWindowParent.TakeSnapshot. Is there a difference?

Thanks
Brian

[salvadordf]

TakeSnapshot is an old function copied from CEF4Delphi that doesn't work with WebView2.
It uses BitBlt and I'll remove it in the next update.

[brche]

It looks like CapturePreview does not work when the browser (or Window Parent?) is hidden.
We hide the form and take snapshots of the browser to display to the user. This does not seem to work when the form is hidden.

Brian

[salvadordf]

This seems to be an upstream issue in WebView2.

Try using the Page.captureScreenshot DevTools method :
https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-captureScreenshot

The MiniBrowser demo of the CEF4Delphi project uses it here :
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1288
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1370

Calling devtools methods in WebView4Delphi is very similar but you will have to use a JSON parser to get the result data and then use TNetEncoding.Base64.DecodeStringToBytes to decode it.

You may also report this CapturePreview issue in the official WebView2 Feedback repository :
https://github.com/MicrosoftEdge/WebView2Feedback

[brche]

Thanks,
It looks like is has already been reported:
https://github.com/MicrosoftEdge/WebView2Feedback/issues/579

Brian

[brche]

This seems to be an upstream issue in WebView2.

Try using the Page.captureScreenshot DevTools method :
https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-captureScreenshot

The MiniBrowser demo of the CEF4Delphi project uses it here :
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1288
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1370

Calling devtools methods in WebView4Delphi is very similar but you will have to use a JSON parser to get the result data and then use TNetEncoding.Base64.DecodeStringToBytes to decode it.

You may also report this CapturePreview issue in the official WebView2 Feedback repository :
https://github.com/MicrosoftEdge/WebView2Feedback

It looks like Devtools Page.captureScreenshot has the same problem.

Brian

[brche]

This seems to be an upstream issue in WebView2.

Try using the Page.captureScreenshot DevTools method :
https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-captureScreenshot

The MiniBrowser demo of the CEF4Delphi project uses it here :
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1288
https://github.com/salvadordf/CEF4Delphi/blob/03f9e9a1b9860ece476e1c9f667937d53370008d/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L1370

Calling devtools methods in WebView4Delphi is very similar but you will have to use a JSON parser to get the result data and then use TNetEncoding.Base64.DecodeStringToBytes to decode it.

You may also report this CapturePreview issue in the official WebView2 Feedback repository :
https://github.com/MicrosoftEdge/WebView2Feedback

It looks like Devtools Page.captureScreenshot has the same problem.

Brian

Do you have any ideas on how to make this work; or am I going to have to start using CEF4Delphi instead?

Brian

[salvadordf]

I haven't checked these methods but I would also try :

• Moving the TWVWindowParent control to a position outside the screen like (-1000, -1000) instead of setting the visibility to false.
• Using JavaScript to take screenshots : https://stackoverflow.com/questions/42828187/how-to-take-a-screenshot-in-html-with-javascript
• Using the WindowlessBrowser demo and modify TWVDirectCompositionHost.UpdateSize to move the visual to (-1000, -1000) or set a clipping rect with zero width and height instead of setting the visibility to false.

If all these points fail and you can't wait until the WebView2 project fixes this issue then you can move to CEF4Delphi.