New Item must be added to array before accessing it.
PuzzlePieces[Piece] = ObjectInitializer.CreateDefaultSubobject<...>(...);
This should be replaced with:
PuzzlePieces.Add(ObjectInitializer.CreateDefaultSubobject<...>(...));
Using a TArray to store multiple components being setup inside a for loop of a constructor will crash on project open.
Crash Reporter:
[Link Removed]
1. Open UE4 Editor (any project)
2. Add code to project based on Actor (MyActor)
3. Add the following to the constructor declaration
(const FObjectInitializer &ObjectInitialIzer)
4.. In the header file add the following:
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
int32 PuzzleWidth;
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
int32 PuzzleHeight;
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
float PieceWidth;
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
int32 TotalPieces;
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
USceneComponent* Root;
UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = Puzzle)
TArray<UStaticMeshComponent*> PuzzlePieces;
5. In the source file add the following to the constructor:
PuzzleWidth = 3; PuzzleHeight = 3; PieceWidth = 2.f; TotalPieces = PuzzleHeight * PuzzleWidth; Root = ObjectInitializer.CreateDefaultSubobject<USceneComponent>(this, TEXT("Root")); for (int32 Piece = 0; Piece < TotalPieces; Piece++) { FString PieceName = "PieceMesh" + FString::FromInt(Piece); PuzzlePieces[Piece] = ObjectInitializer.CreateDefaultSubobject<UStaticMeshComponent>(this, FName(*PieceName)); PuzzlePieces[Piece]->AttachParent = RootComponent; PuzzlePieces[Piece]->AttachSocketName = FName(*PieceName); }
6. Compile
7. Open the project
Result:
Editor will crash on open. Running in debug causes breakpoint during loading process
MachineId:9FA88CA44B7C623122B0039D6C8BA1B0 Unknown exception - code 00000001 (first/second chance not available) "Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Builds\Main\UE4\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 678] Array index out of bounds: 0 fr KERNELBASE UE4Editor_Core!FOutputDeviceWindowsError::Serialize() [d:\builds\main\ue4\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95] UE4Editor_Core!FOutputDevice::Logf__VA() [d:\builds\main\ue4\engine\source\runtime\core\private\misc\outputdevice.cpp:144] UE4Editor_Core!FDebug::AssertFailed() [d:\builds\main\ue4\engine\source\runtime\core\private\misc\outputdevice.cpp:360] UE4Editor_ForLoopBreakTEST UE4Editor_CoreUObject!UClass::CreateDefaultObject() [d:\builds\main\ue4\engine\source\runtime\coreuobject\private\uobject\class.cpp:2538] UE4Editor_CoreUObject!UObjectLoadAllCompiledInDefaultProperties() [d:\builds\main\ue4\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:680] UE4Editor_CoreUObject!ProcessNewlyLoadedUObjects() [d:\builds\main\ue4\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:768] UE4Editor_CoreUObject!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [d:\builds\main\ue4\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:921] UE4Editor_Core!TBaseMulticastDelegate<void>::Broadcast() [d:\builds\main\ue4\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:1031] UE4Editor_Core!FModuleManager::LoadModuleWithFailureReason() [d:\builds\main\ue4\engine\source\runtime\core\private\modules\modulemanager.cpp:413] UE4Editor_Projects!FModuleDescriptor::LoadModulesForPhase() [d:\builds\main\ue4\engine\source\runtime\projects\private\moduledescriptor.cpp:370] UE4Editor_Projects!FProjectManager::LoadModulesForProject() [d:\builds\main\ue4\engine\source\runtime\projects\private\projectmanager.cpp:53] UE4Editor!FEngineLoop::LoadStartupModules() [d:\builds\main\ue4\engine\source\runtime\launch\private\launchengineloop.cpp:1903] UE4Editor!FEngineLoop::PreInit() [d:\builds\main\ue4\engine\source\runtime\launch\private\launchengineloop.cpp:1425] UE4Editor!GuardedMain() [d:\builds\main\ue4\engine\source\runtime\launch\private\launch.cpp:110] UE4Editor!GuardedMainWrapper() [d:\builds\main\ue4\engine\source\runtime\launch\private\windows\launchwindows.cpp:126] UE4Editor!WinMain() [d:\builds\main\ue4\engine\source\runtime\launch\private\windows\launchwindows.cpp:249]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-14113 in the post.
| 0 |
| Component | UE - Foundation - Core |
|---|---|
| Affects Versions | 4.8 |
| Target Fix | 4.9 |
| Created | Apr 20, 2015 |
|---|---|
| Resolved | Apr 22, 2015 |
| Updated | Feb 5, 2017 |