比较Cocos2d-x v2.x与v3.x的截图功能

（1）Cocos2d-x 2.x

Cocos2d-x 2.x没有提供截图功能，但是可以用CCRenderTexture来实现这个功能：

[cpp] view plain copy

voidCTestLayer::SaveScreenShot()
{
//获取屏幕尺寸
CCSizesize=CCDirector::sharedDirector()->getWinSize();
//使用屏幕尺寸初始化一个空的渲染纹理对象
CCRenderTexture*texture=CCRenderTexture::create((int)size.width,(int)size.height);
//设置位置
texture->setPosition(ccp(size.width/2,size.height/2));
//开始获取
texture->begin();
//遍历场景节点对象，填充纹理到texure中
CCDirector::sharedDirector()->getRunningScene()->visit();
//结束获取
texture->end();
//保存为PNG图，Win32/Debug目录下
texture->saveToFile("screenshot.png",kCCImageFormatPNG);
}

（2）Cocos2d-x 3.x

在Cocos2d-x 3.2之前，引擎也没有提供截图功能，同样可以使用RenderTexture实现：

[cpp] view plain copy

voidDirector::saveScreenshot(conststd::string&fileName,conststd::function<void(conststd::string&)>&callback)
{
Image::Formatformat;
//进行后缀判断
if(std::string::npos!=fileName.find_last_of(".")){
autoextension=fileName.substr(fileName.find_last_of("."),fileName.length());
if(!extension.compare(".png")){
format=Image::Format::PNG;
}elseif(!extension.compare(".jpg")){
format=Image::Format::JPG;
}else{
log("cocos2d:theimagecanonlybesavedasJPGorPNGformat");
return;
}
}else{
log("cocos2d:theimagecanonlybesavedasJPGorPNGformat");
return;
}
//获取屏幕尺寸，初始化一个空的渲染纹理对象
autorenderTexture=RenderTexture::create(getWinSize().width,getWinSize().height,Texture2D::PixelFormat::RGBA8888);
//清空并开始获取
renderTexture->beginWithClear(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
autofullPath=FileUtils::getInstance()->getWritablePath()+fileName;
autoscheduleCallback=[&,fullPath,callback](floatdt){
callback(fullPath);
};
auto_schedule=getRunningScene()->getScheduler();
_schedule->schedule(scheduleCallback,this,false,"screenshot");
}

（3）从Cocos2d-x 3.2之后开始，引擎提供了captureScreen函数来实现截图功能：

[cpp] view plain copy

voidUtil::captureScreen(conststd::function<void(bool,conststd::string&)>&afterCaptured,conststd::string&filename);

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