[C++] How to debug in the constructor

Development Platform & Builds Debugging, Optimization, & Profiling
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1

Hey guys

My current problem is i want the purple arrows to point to each other. Essentially I want to show what objects are linked in the viewport, but I’m unsure on 1 thing.

How can I debug the constructor of a class WHILE MY GAME IS NOT PLAYING? My UE_LOGS are not printing, I tried to make the variable visible in the details tab but it seems to be more editable rather than live updating.

any help would be greatly appreciated!

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So do you want the arrows to update rotation in the constructor or do you want a property in the editor to update from the constructor and show its value live? To do that you would have to use post init properties function. Here is a link to the docs, near the top is a section called “setting defaults in my constructor” that talks about this. Let me know if that works.

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Ideally both, I want the arrow to update rotation in the constructor, but I would like to know the live values of some of the vectors I’m calculating.

For example when moving my object around in the editor I would like to see that angle I’m trying to generate, whether it’s in a log or in the details tab.

I’m not sure if the link provided helps, I think I’m already doing that but I’ll double check when I get home

4

We can debug on screen like this. Just make the changes to print out your transform, rotation, etc. (will need header #include “Engine.h”)

if (GEngine != NULL) 
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, TEXT("Hovering"));

Or in the logs likes this. Next to content browser labeled ‘Output Log’

UE_LOG(LogClass, Log, TEXT("Name: %s"), *FoundActors[i]->GetName());

Hope this helps debugging!

5

hmm, this is hard to explain, But i think its not the constructor i want, by doing a bit of research, I think theres a function i need to overwrite called OnConstructor? Since i want this to be called when moving the object in the editor like this

EDIT also looks like theres a virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override; anyone seen or used these before?

6

SOLVED:

The problem is I wasn’t looking in the right spot, The constructor is only called when the object is compiled or placed into the world. I needed a function that was called EVERY time the object was moved, (much like the constructor in the blueprints).