C++ Transition Guide for 4.22

[Rama]

Dear Community,

Yay for 4.22!

Here is a thread where you can post any issues you encounter while upgrading to 4.22, with a focus on C++ compile issues.

~~~
VS 2017 Update

WindowsPlatformCompilerSetup.h(22): error C2338: Visual Studio 2017 versions 15.7 and 15.8 are known to have code generation bugs that affect UE4. Please update to version 15.9.

Solution: Downloaded the Latest VS 2017
https://docs.microsoft.com/en-us/vis...s2017-relnotes

~~~

error C2065: 'PST_Sync': undeclared identifier

PxScene* PScene = PhysScene->GetPxScene(PST_Sync);

Solution

PxScene* PScene = PhysScene->GetPxScene();

Victory to You!

♥

Rama

[ioFlow Studios]

Woohoo, first in

I do a lot of stuff with procedural mesh components, when I try to migrate my projects into 4.22 they break because (apparently) shader core has been merged into render core.

Can some tell me how to setup the build files in 4.22 to get this working again?

[SolidSk]

I'm having problem with UWidgetAnimation specifically OnAnimationFinished_DEPRECATED. I don't know what to use instead!

Thank you!

[Soverance]

I had the following error when upgrading my project from 4.21:

error C3248: 'AController::Possess': function declared as 'final' cannot be overridden by 'AEnemyAI::Possess'

Where I had written a custom EnemyAI class and overridden the Possess function. In my case, simply renaming my function did the trick. So this:

virtual void Possess(APawn *InPawn) override;

Turned into this:

virtual void PossessEnemy(APawn *InPawn);

And now I have to manually call my custom possess function in my enemy's master class BeginPlay function, so that the AI actually starts working again:

Cast<AEnemyAI>(GetController())->PossessEnemy(this);

[order66]

I had the following error when upgrading my project from 4.21:

error C3248: 'AController::Possess': function declared as 'final' cannot be overridden by 'AEnemyAI::Possess'

Try using:

AController::OnPossess

[0lento]

This commit has nice examples if you are using ENQUEUE_UNIQUE_RENDER_COMMAND_* which is now replaced by ENQUEUE_RENDER_COMMAND:
https://github.com/EpicGames/UnrealE...d71c756a5624b0

[Quexlaw]

I think we should get a separate VS2019 section of topic, since it was released just yesterday together with UE4.22.

I noticed a C4800 ERROR: Implicit conversion to bool, which should be a warning, not an error, in VS2019, not VS2017.
Since I can't find any information it seems like this might be an Unreal specific thing, in which warnings of a certain level get treated as errors automtically and I can't find any settings for that.

[erebel55]

bTraceAsyncScene has been removed since Async Scene was deprecated in 4.21 and now removed in 4.22

[looter]

I think we should get a separate VS2019 section of topic, since it was released just yesterday together with UE4.22.

I noticed a C4800 ERROR: Implicit conversion to bool, which should be a warning, not an error, in VS2019, not VS2017.
Since I can't find any information it seems like this might be an Unreal specific thing, in which warnings of a certain level get treated as errors automtically and I can't find any settings for that.

Someone has created a topic for this issue here, https://forums.unrealengine.com/deve...n-using-vs2019

[theflamingskunk]

ReplicationGraph's TClassMap Getter changed to use (UClass *) instead of (const UClass *)

[Sveitar]

I'm having problem with UWidgetAnimation specifically OnAnimationFinished_DEPRECATED. I don't know what to use instead!

Thank you!

There is a method for that now UWidgetAnimation::BindToAnimationFinished. However when I use that method to bind my event I get a link error. I will continue investigating the cause of that link error.
In the meantime the only solution that I found is to override the method OnAnimationFinished_Implementation inside my user widget and then check if the animation that finished playing is the one that I want the event for, and then I fire the event manually.

Cheers!

[DamirH]

If your module's folder is called ABC2, the module name now has to be ABC2, you can't do IMPLEMENT_MODULE(SomeModule, ABC).

[tommybazar]

If you use custom material nodes and accessed the object's Primitive structure directly (along the lines of)

Primitive.WorldToLocal

you need to replace it with a getter of primitive data on the FMaterialPixelParameters struct, like so

GetPrimitiveData(Parameters.PrimitiveId).WorldToLocal

(which the material compiler will practically spell out for you, but anyways...)

[NilsonLima]

(which the material compiler will practically spell out for you, but anyways...)

Which should do the replacement automatically for you, but don't, give us more work to do, lol

[straypet]

Woohoo, first in

I do a lot of stuff with procedural mesh components, when I try to migrate my projects into 4.22 they break because (apparently) shader core has been merged into render core.

Can some tell me how to setup the build files in 4.22 to get this working again?

Just go to your <Project>.Build.cs file and remove "ShaderCore" from the list of modules. Since the contents were moved to RenderCore, ShaderCore simply is no longer needed.