cocos2d-x如何截屏并保存图片

static void ScreenShoot(){    CCSize size = CCDirector::sharedDirector()->getWinSize();      //定义一个屏幕大小的渲染纹理      CCRenderTexture* pScreen = CCRenderTexture::create(size.width,size.height, kCCTexture2DPixelFormat_RGBA8888);      //获得当前的场景指针      CCScene* pCurScene = CCDirector::sharedDirector()->getRunningScene();      //渲染纹理开始捕捉      pScreen->begin();      //当前场景参与绘制      pCurScene->visit();      //结束捕捉      pScreen->end();      //保存为png    pScreen->saveToFile("XXXXXX.png", kCCImageFormatPNG);      //保存为jpg    pScreen->saveToFile("XXXXXX.jpg", kCCImageFormatJPEG);       CC_SAFE_DELETE(pScreen); }