How can I open the Facebook App or Browser for sharing image capture screen on WP8?

cocos2d-x C++
1

I am a developer in cocos2d-x with C++. In C++ class, I capturned screen.

void Scene_GameOver::captureScreen() {
Size screen = Director::getInstance()->getWinSize(); RenderTexture *texture = RenderTexture::create(screen.width, screen.height); texture->setPosition(screen.width/2, screen.height/2); texture->begin(); Director::getInstance()->getRunningScene()->visit(); texture->end(); texture->saveToFile(“screenshot.png”, Image::Format::PNG);

}
What must I do in mainpage.xaml.cs?