I’m having an object that communicates with a server. I’m trying to make it replace scene with Error scene if an error occurs, but it is not working.
if(json.Parse<0>(resp.c_str()).HasParseError())
{
CCLOG("PARSE ERROR HANDLE THIS!!!");
auto scene = crashScene::createScene();
Director::getInstance()->replaceScene(scene);
}
I can confirm scene is created but it wont replace?
I would use the debugger and step over this code. Place a breakpoint on your Director line and then examine the scene variable that was created. Also, post what crashScene::createScene() is doing.
Thanks for helping.
CrashScene is just background and a button for restart so far.
bool crashScene::init()
{
if ( !Scene::init() )
{
return false;
}
visibleSize = Director::getInstance()->getVisibleSize();
origin = Director::getInstance()->getVisibleOrigin();
auto crash_screen = Sprite::create("CrashScreen/crash_screen.png");
if (crash_screen == nullptr)
{
CCLOG("Error: 'crash_screen'");
}
else
{
crash_screen->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
this->addChild(crash_screen);
restartButton = Button::create("CrashScreen/restart_button.png", "CrashScreen/restart_button.png");
restartButton->addTouchEventListener([&](Ref* sender, Widget::TouchEventType type)
{
switch(type)
{
case Widget::TouchEventType::BEGAN:
break;
case Widget::TouchEventType::ENDED:
{
auto scene = splashScreen::createScene();
Director::getInstance()->replaceScene(scene);
break;
}
case Widget::TouchEventType::CANCELED:
break;
default:
break;
}
});
restartButton->setPosition(Vec2(200, 120));
crash_screen->addChild(restartButton);
}
CCLOG("START CRASH");
return true;
}
Code goes to createScene, it finishes the init() and then it goest back to
Director::getInstance()->replaceScene(scene);
but nothing happens… it continues execution of the function that calls that code 
Scene looks valid.
Any ideas?
Director::getInstance()->replaceScene();
requires you pass it a Scene Object. I dont see where you are doing that.
please show createScene()
Does it hit your CCLOG statement?
Does it hot your auto line? Add some logs in there to see how far it gets or use the debugger
Document dbManager::validateJson(string resp)
{
Document json;
if(json.Parse<0>(resp.c_str()).HasParseError())
{
CCLOG("PARSE ERROR HANDLE THIS!!!");
auto scene = crashScene::createScene();
Director::getInstance()->replaceScene(scene);
// Director::getInstance()->replaceScene(crashScene::createScene());
}
else
{
if(!string(json["status"].GetString()).compare("OK"))
return json;
if(!string(json["status"].GetString()).compare("ERROR"))
{
.........
return json;
}
}
return json; // Just for testing
}
Document dbManager::authUser(std::string u)
{
...
res = sendReqSync(SERVERNAME"user.php?cmd=AUTH&user=" + usr);
json = this->validateJson(res);
return json;
}
json = _dbManager->authUser(userText->getString().c_str());
this->buttonThinking(false);
_userData->loadUserDataStruct(json); <--- Crashes first line here when i tries to parse json
It keep going untill it crashes when trying to parse the invalid json
So, I made a quick test. I have 3-4 places in my code that i replaceScene, but it is always at the end of the code flow. So I added some code after the replaceScenes that were working fine and what happens is that the following code is again executed before the actual scene replace occurs. Is there a way to handle this as I need to replace scene only if a condition occurs ?
Is this running on the main/cocos thread?
It should be. I’m not using threads.
I would have handled the validation a bit differently. Maybe if you have the initial validation function return a bool instead of a Document, you can check against it being valid or not. if (validateJson()) { … continue parsing etc } else { handle error case}… or something of that nature.
in pseudo form:
bool validateJSON(string resp);
Document parseJSON(string resp);
void handleError();
if (validateJSON(resp)) {
parseJSON(resp);
} else {
handleError()
}
I will have to change my whole logic here as Im having an object that communicates with the server. So the scene asks this object to get the response json = dbManager->getResponse. So the function will have to return… that leads to the same problem again. Or I will have to add this check to every server call i make from the scene itself 
Not necessarily, depends how you return the ‘object’… You can create a new object type:
struct ServerResponse {
bool success;
Document data;
};
then you return a ServerResponse instead of Document, and just check if (serverResponse.success) { use serverresmonde.data } else {follow error path}
Note this is just an example case to keep existing code structure with a different response object.
Yup, that’s something i was planning as a workaround, just I somehow feel replaceScene should occur right when its called. Thank you for helping with this!
