Cocos2d-x3.1及3.2实现截屏功能

1、Cocos2d-x3.1

1.1首先在CCDirector.h中添加如下代码：并在其中添加头文件  #include
"2d/CCRenderTexture.h"

void saveScreenshot(const std::string& fileName,const std::function<void(const std::string&)>& callback);

1.2然后在CCDirector.cpp中添加如下代码：

void Director::saveScreenshot(const std::string &fileName, const std::function<void (const std::string &)> &callback)
{
Image::Format format;
//进行后缀判断
if(std::string::npos != fileName.find_last_of(".")){
auto extension = fileName.substr(fileName.find_last_of("."),fileName.length());
if (!extension.compare(".png")) {
format = Image::Format::PNG;
} else if(!extension.compare(".jpg")) {
format = Image::Format::JPG;
} else{
log("cocos2d: the image can only be saved as JPG or PNG format");
return;
}
} else {
log("cocos2d: the image can only be saved as JPG or PNG format");
return ;
}
//获取屏幕尺寸，初始化一个空的渲染纹理对象
auto renderTexture = RenderTexture::create(getWinSize().width, getWinSize().height, Texture2D::PixelFormat::RGBA8888);
//清空并开始获取
renderTexture->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);
//遍历场景节点对象，填充纹理到RenderTexture中
getRunningScene()->visit();
//结束获取
renderTexture->end();
//保存文件
renderTexture->saveToFile(fileName , format);
//使用schedule在下一帧中调用callback函数
auto fullPath = FileUtils::getInstance()->getWritablePath() + fileName;
auto scheduleCallback = [&,fullPath,callback](float dt){
callback(fullPath);
};
auto _schedule = getRunningScene()->getScheduler();
_schedule->schedule(scheduleCallback, this, 0.0f,0,0.0f, false, "screenshot");

}

1.3在HelloWorld.cpp中添加如下代码：

bool HelloWorld::init()
{
bool bRet = false;
do{
CC_BREAK_IF(!Layout::init());
auto button = ui::Button::create("CloseNormal.png","CloseSelected.png");
button->setPosition(Vec2(200,200));
addChild(button);
button->addTouchEventListener(CC_CALLBACK_2(HomeLayer::touchEvent,this));
Director::getInstance()->getEventDispatcher();

bRet = true;
}while(0);
return bRet;
}

void HelloWorld::touchEvent(cocos2d::Ref *pSender, cocos2d::ui::Widget::TouchEventType type)
{
switch (type)
{
case Widget::TouchEventType::ENDED:
<span style="white-space:pre">	</span>    //参数依次为保存图片的名字，在控制台打印保存路径信息
Director::getInstance()->saveScreenshot("homeLayer.png", [&](const std::string &str){
log("str = %s",str.c_str());
});
break;
default:
break;
}
}

1.4点击按钮，实现截图功能，最后图片保存在沙盒中，可在Xcode控制台下看到文件保存路径。

2、Cocos2d-x3.2

void Util::captureScreen(const std::function<void(bool, const std::string&)>& afterCaptured, const std::string& filename);