handle - Chrome_RenderWidgetHostHWND

[Vaytl]

Hello Salvadordf!
Tell me how can I get the handle of the active window with the class name "Chrome_RenderWidgetHostHWND"?

[salvadordf]

Hi,

TWVBrowserBase already has the code to find the window called "Chrome_RenderWidgetHostHWND" and all other windows created by WebView2.

TWVBrowserBase has 4 events to intercept the messages sent to those windows :

• TWVBrowserBase.OnWidget0CompMsg
• TWVBrowserBase.OnWidget1CompMsg
• TWVBrowserBase.OnRenderCompMsg
• TWVBrowserBase.OnD3DWindowCompMsg

I just uploaded a new version of WebView4Delphi to GitHub which exposes all these handles :

• TWVBrowserBase.RenderCompHWND
• TWVBrowserBase.Widget0CompHWND
• TWVBrowserBase.Widget1CompHWND
• TWVBrowserBase.D3DWindowCompHWND

[Vaytl]

Greate.
Many thanks.

[Vaytl]

Why do I get a blank image when trying to take a screenshot using these handles?

[salvadordf]

Try using the TWVBrowser.CapturePreview instead and implement the TWVBrowser.OnCapturePreviewCompleted event to get the image.

Capturing images using HWNDs usually fails when the hardware acceleration is enabled.

[Vaytl]

It didn't work:

Code: Select all

  GlobalWebView2Loader.EnableGPU := false;

Screenshot works fine with Edge (Chrome_RenderWidgetHostHWND)

Try using the TWVBrowser.CapturePreview instead and implement the TWVBrowser.OnCapturePreviewCompleted event to get the image.

Could you provide an example? I can't figure out how to implement it.

[salvadordf]

Try using the TWVBrowser.CapturePreview instead and implement the TWVBrowser.OnCapturePreviewCompleted event to get the image.

Could you provide an example? I can't figure out how to implement it.

The MiniBrowser demo has all the code here :
https://github.com/salvadordf/WebView4Delphi/blob/53325f5db15b71aed8fb0aa903b6e7d51174e94c/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L181
https://github.com/salvadordf/WebView4Delphi/blob/53325f5db15b71aed8fb0aa903b6e7d51174e94c/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L499