Capture an image of what WebView is displaying. Specify the format of
the image with the imageFormat parameter. The resulting image binary
data is written to the provided imageStream parameter. When
CapturePreview finishes writing to the stream, the Invoke method on
the provided handler parameter is run. This method fails if called
before the first ContentLoading event. For example if this is called in
the NavigationStarting event for the first navigation it will fail.
For subsequent navigations, the method may not fail, but will not capture
an image of a given webpage until the ContentLoading event has been fired
for it. Any call to this method prior to that will result in a capture of
the page being navigated away from.
The D Programming Language's Unofficial Docs
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Capture an image of what WebView is displaying. Specify the format of the image with the imageFormat parameter. The resulting image binary data is written to the provided imageStream parameter. When CapturePreview finishes writing to the stream, the Invoke method on the provided handler parameter is run. This method fails if called before the first ContentLoading event. For example if this is called in the NavigationStarting event for the first navigation it will fail. For subsequent navigations, the method may not fail, but will not capture an image of a given webpage until the ContentLoading event has been fired for it. Any call to this method prior to that will result in a capture of the page being navigated away from.
\snippet FileComponent.cpp CapturePreview