Chromium Embedded Framework Forum

by **giridharb54** » Thu Nov 21, 2013 4:40 am

After checking out the Chromium Embedded Framework example I have a question. I need native interaction with the embedded part of my window. However, in the CEF example, all I saw was the c++ sending messages to the browser, not the other way around. I was wondering if there is any way to send a message from JavaScript from c++??? . I saw that there are IPC messaging and posting tasks. Please let us know the right way to do it.

by **magreenblatt** » Thu Nov 21, 2013 9:21 am

See the JavaScriptIntegration and GeneralUsage wiki pages.

by **giridharb54** » Thu Nov 28, 2013 8:13 am

hi ,

I went through the javascript integration and general usage wiki pages. I am succesfully able to hook up CEF3 with sample application. I am able to execute javascript from c++ via executescript. I still couldn't figure out a way to call c++ code from javascript. Please share some sample code,functions to call and use.

by **magreenblatt** » Thu Nov 28, 2013 9:18 am

Look at the usage of CefV8Handler.

by **giridharb54** » Thu Nov 28, 2013 10:14 am

Here is the code i have written.Please correct me if anything is wrong.

Code: Select all: #include "cefapplicationhandler.h" #include "include/cef_app.h" #include "applicationV8Handler.h" bool cefapplicationhandler ::OnProcessMessageReceived( CefRefPtr<CefBrowser> browser, CefProcessId source_process, CefRefPtr<CefProcessMessage> message) { if (message->GetName() == "InvokeScript") { return true; // message handled } return false; } void cefapplicationhandler::OnWebKitInitialized() { std::string extensionCode = "var test;" "if (!test)" " test = {};" "(function() {" " test.myfunc = function() {" " native function myfunc();" " return myfunc();" " };" "})();"; // Create an instance of my CefV8Handler object. CefRefPtr<CefV8Handler> handler = new applicationV8Handler(); // Register the extension. CefRegisterExtension("v8/test", extensionCode, handler); }

Code: Select all: #include "include\cef_v8.h" class applicationV8Handler : public CefV8Handler { public: applicationV8Handler() {} virtual bool Execute(const CefString& name, CefRefPtr<CefV8Value> object, const CefV8ValueList& arguments, CefRefPtr<CefV8Value>& retval, CefString& exception) OVERRIDE { if (name == "ChangeTextInJS") { // Return my string value. retval = CefV8Value::CreateString("My Value!"); return true; } // Function does not exist. return false; } // Provide the reference counting implementation for this class. IMPLEMENT_REFCOUNTING(applicationV8Handler); };

I worte the above code.it is not hitting the onwebkinitialised function at all.Please let me know how to make it work

by **magreenblatt** » Thu Nov 28, 2013 11:07 am

V8-related callbacks will be executed in the render process. The Wiki documents contain links to debugging tips. Make sure you implement CefApp::GetRenderProcessHandler().

by **giridharb54** » Thu Nov 28, 2013 1:51 pm

hi i implemented CefApp::GetRenderProcessHandler().It is hitting the breakpoints now. I have a javascript code as below.

Code: Select all: <!DOCTYPE html> <html> <head> <script> function myFunction() { alert(window.myfunc()); } </script> </head> <body> <button onclick="myFunction()">Try it</button> <p>By clicking the button above, a function will be called. The function will alert a message.</p> </body> </html>

I have a breakpoint set inside execute function of applicationv8handler. when i click on the button i execute alert(window.myfunc());
it is not hitting the breakpoint in the execute function. Please let me know what should i change.

by **giridharb54** » Thu Nov 28, 2013 3:32 pm

I figured it out.Basically i had to call alert(test.myfunc). thanks for the replies.

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