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JS 调用 C ++ 函数
- (1)继承 CefRenderProcessHandler
- (2)重写 OnContextCreated 虚函数
- (3)绑定值或者 JS 对象(数组)到 window 对象上
- (4)在 js 中拜访 window 对象上绑定的值(或者 JS 对象、数组等)
// Called immediately after the V8 context for a frame has been created. To
// retrieve the JavaScript 'window' object use the CefV8Context::GetGlobal()
// method. V8 handles can only be accessed from the thread on which they are
// created. A task runner for posting tasks on the associated thread can be
// retrieved via the CefV8Context::GetTaskRunner() method.
///
/*--cef()--*/
virtual void OnContextCreated(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
OnContextCreated 接口切实 chrome 的 V8 引擎创立后调用的,在这里咱们须要将 JS 外面调用的函数和 C ++ 的执行函数关联起来,这样 JS 就能够“执行”C++ 代码了。
咱们的函数都是定义在 window 对象中的,依据正文咱们须要 GetGlobal 获取这个对象。
void SimpleApp::OnContextCreated(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Context> context)
{
// The var type can accept all object or variable
CefRefPtr<CefV8Value> window = context->GetGlobal();
// bind value into window[or you can bind value into window sub node]
CefRefPtr<CefV8Value> strValue = CefV8Value::CreateString("say yes");
window->SetValue("say_yes", strValue, V8_PROPERTY_ATTRIBUTE_NONE);
}
CefRefPtr<CefV8Handler> myV8handle = new CCefV8Handler();
CefRefPtr<CefV8Value> myFun = CefV8Value::CreateFunction(L"SetAppState", myV8handle);
static_cast<CCefV8Handler*>(myV8handle.get())->AddFun(L"SetAppState", &CChromeJsCallback::JsSetAppState);
pObjApp->SetValue(L"SetAppState", myFun, V8_PROPERTY_ATTRIBUTE_NONE);
正文完