转自 http://www.cppblog.com/merlinfang/archive/2013/08/06/202364.html

void ScreenShoot::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);//截取格式;
	//获取当前的场景指针：
	CCScene * pCurScene = CCDirector::sharedDirector()->getRunningScene();
	//渲染纹理开始捕捉：
	pScreen->begin();
	//当前场景参与绘制；
	this->visit();//pCurScene->visit(),这样用会发生访问冲突；
	//结束捕捉;
	pScreen->end();
	//保存为png;
	pScreen->saveToFile("XXX.png",kCCImageFormatPNG);//保存为png格式的，kCCImageFormatJPG 保存为jpg格式的;
	CC_SAFE_DELETE(pScreen);//截完后删除；
}