SendProcessMessage doesn't work when using stored browser

[Czarek]

I have a JavascriptAPI object which implements CefV8Handler. I am creating this object in CefRenderProcessHandler::OnContextCreated and am passing CefRefPtr<CefBrowser> to store as JavascriptAPI.cefBrowser_ member. Later when JavascriptAPI::Execute calls when I execute browser->GetMainFrame()->SendProcessMessage() then that message never arrives to browser process. When I use context->GetBrowser() instead of the cefBrowser_ stored property then process messaging works OK. Why would that be? I checked and both browsers return the same identifier, so I don't think I'm making a stupid mistake. Just letting know of this behavior. Fix is easy, however debugging took some time. It worked fine in some old CEF version when using stored browser object.

CEF version: 130.1.15+g34b05bb+chromium-130.0.6723.92

[magreenblatt]

What frame is your JavaScript code executing within? Is it the main frame?

[ndesktop]

Maybe the frame was swapped/replaced?

[Czarek]

Yes, it is main frame. It's a very simple html page, just clicking a link:

Code: Select all

<a href="javascript:phpdesktop.ToggleFullscreen()">
    phpdesktop.ToggleFullscreen()</a>


[Czarek]

Before clicking a link there is a navigation occuring on a page. Here are some logs from app:

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- 20:32:56.157 DEBUG: App context initialized
- 20:32:56.157 INFO: Create main window
- 20:32:56.157 DEBUG: Window max width/height = 2480/1352
- 20:32:56.157 DEBUG: Browser window not found, hwnd = 3278524
- 20:32:56.157 DEBUG: Event WM_GETMINMAXINFO: could not fetch browser window
- 20:32:56.157 DEBUG: Create main browser
- 20:32:56.157 INFO: Runtime style: alloy
- 20:32:56.157 DEBUG: Store browser window, hwnd = 3278524
- 20:32:56.172 INFO: Main window was created, hwnd=3278524
- 20:32:56.188 DEBUG: Browser was created
- 20:32:56.188 DEBUG: Set browser for window
[15400:14016:1111/203256.451:WARNING:viz_main_impl.cc(85)] VizNullHypothesis is disabled (not a warning)
- 20:32:56.204 DEBUG: OnLoadingStateChange: loading=1, url=
- 20:32:56.000 DEBUG: Command line string for the renderer process: "C:\Users\cz\phpdesktop\phpdesktop\Release\phpdesktop-chrome.exe" --type=renderer --string-annotations=is-enterprise-managed=no --start-stack-profiler --user-data-dir="C:\Users\cz\phpdesktop\phpdesktop\Release\webcache" --no-sandbox --remote-debugging-port=64095 --disable-gpu-compositing --video-capture-use-gpu-memory-buffer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --time-ticks-at-unix-epoch=-1731276721788615 --launch-time-ticks=76854660486 --field-trial-handle=3720,i,5630800143355803134,17034278787814789559,262144 --variations-seed-version --enable-logging=handle --log-file=3748 --mojo-platform-channel-handle=3736 /prefetch:1
- 20:32:56.000 DEBUG: Command line string for the renderer process: "C:\Users\cz\phpdesktop\phpdesktop\Release\phpdesktop-chrome.exe" --type=renderer --string-annotations=is-enterprise-managed=no --user-data-dir="C:\Users\cz\phpdesktop\phpdesktop\Release\webcache" --no-sandbox --remote-debugging-port=64095 --disable-gpu-compositing --video-capture-use-gpu-memory-buffer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --time-ticks-at-unix-epoch=-1731276721788615 --launch-time-ticks=76854664481 --field-trial-handle=3752,i,5630800143355803134,17034278787814789559,262144 --variations-seed-version --enable-logging=handle --log-file=3780 --mojo-platform-channel-handle=2052 /prefetch:1
[10364:17952:1111/203256.468:INFO:download_manager_delegate_impl.cc(360)] Rejected download of http://127.0.0.1:60064/download.php?getit=1
[10364:17952:1111/203256.469:INFO:download_manager_delegate_impl.cc(360)] Rejected download of http://127.0.0.1:60127/sqlite-database.db
[10364:17952:1111/203256.469:INFO:download_manager_delegate_impl.cc(360)] Rejected download of http://127.0.0.1:60340/download.php?getit=1
- 20:32:56.015 DEBUG: V8 browser was created
- 20:32:56.266 INFO: GET 200 /
- 20:32:56.266 INFO: GET 200 /style.css
- 20:32:56.062 DEBUG: V8 context created, in context: 1
- 20:32:56.282 DEBUG: OnLoadingStateChange: loading=0, url=http://127.0.0.1:55017/
- 20:32:56.313 INFO: GET 200 /favicon.ico
- 20:32:58.031 DEBUG: Command line string for the utility process: "C:\Users\cz\phpdesktop\phpdesktop\Release\phpdesktop-chrome.exe" --type=utility --utility-sub-type=chrome.mojom.ProcessorMetrics --lang=en-US --service-sandbox-type=none --no-sandbox --string-annotations=is-enterprise-managed=no --user-data-dir="C:\Users\cz\phpdesktop\phpdesktop\Release\webcache" --field-trial-handle=4392,i,5630800143355803134,17034278787814789559,262144 --variations-seed-version --enable-logging=handle --log-file=4456 --mojo-platform-channel-handle=4412 /prefetch:8
- 20:33:01.422 DEBUG: OnLoadingStateChange: loading=1, url=http://127.0.0.1:55017/
- 20:33:01.218 DEBUG: V8 browser was created
- 20:33:01.218 ERROR: StoreJavascriptApi() failed, api already exists
- 20:33:01.250 DEBUG: V8 context created, in context: 1
- 20:33:01.454 INFO: GET 200 /javascript-api.php
- 20:33:01.469 DEBUG: OnLoadingStateChange: loading=0, url=http://127.0.0.1:55017/javascript-api.php
- 20:33:01.500 INFO: GET 200 /favicon.ico
- 20:33:03.656 DEBUG: V8 execute phpdesktop object method: ToggleFullscreen


[Czarek]

Hmm I see this line twice:

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DEBUG: V8 browser was created


Which means that CefRenderProcessHandler::OnBrowserCreated was called twice. Is it being called for each navigation within the same CEF browser?

[magreenblatt]

A different renderer process will be used for cross-origin navigations. Possibly other navigations as well.

[ndesktop]

You can use CefFrameHandler::OnFrameCreated/OnFrameAttached/OnFrameDetached to keep track of the browser and frame identifiers and compare with those used by the SendProcessMessage (browser and browser->GetMainFrame() identifiers) to be sure.