C++ 虚幻引擎4：如何将委托传递到异步行跟踪？
我正在尝试在unreal中跟踪很多行，目前我正在使用C++ 虚幻引擎4：如何将委托传递到异步行跟踪？,c++,unreal-engine4,C++,Unreal Engine4,我正在尝试在unreal中跟踪很多行，目前我正在使用LineTraceSingleByChannel（来自不同的同步线程）进行跟踪。但是，我正在尝试切换到AsyncLineTraceByChannel，在那里我想使用FTraceDelegate在完成时调用函数。我似乎在编译时出错，但我无法找出原因。错误点位于第571行，即FTraceDelegate的闭合支架所在的位置（我在代码中对此进行了标记） 我做错了什么？我该如何解决这个问题 导致错误的代码： FTraceHandle UAirBluep
LineTraceSingleByChannelAsyncLineTraceByChannelFTraceDelegateFTraceHandle UAirBlueprintLib::GetObstacleAdvAsync(const AActor* actor, const FVector& start, const FVector& end,
FHitResult& hit, TArray<AActor*>& ignore_actors, ECollisionChannel collision_channel, bool trace_complex, bool get_material)
{
bool bIgnoreSelf = false;
FName traceTag;
FTraceDelegate traceDelegate = FTraceDelegate::CreateWeakLambda(actor, [](const FTraceHandle& handle, FTraceDatum& data)
{
//My logic goes here;
if (data.OutHits.Num() > 0)
{
const FHitResult& Result = data.OutHits[0];
}
});
FCollisionQueryParams trace_params;
trace_params.bReturnPhysicalMaterial = get_material;
trace_params.bTraceComplex = trace_complex;
trace_params.AddIgnoredActors(ignore_actors);
return actor->GetWorld()->AsyncLineTraceByChannel(EAsyncTraceType::Single,
start, end,
collision_channel,
trace_params,
FCollisionResponseParams::DefaultResponseParam,
&traceDelegate);
}
ftraceholder UAirBlueprintLib:：GetObstacleAdvAsync（const AActor*actor、const FVector&start、const FVector&end、，
FHitResult&hit，TArray&ignore_actors，ECollisionChannel碰撞_channel，bool trace_complex，bool get_material）
{
bool-bIgnoreSelf=false；
FName-traceTag；
FTraceDelegate traceDelegate=FTraceDelegate:：CreateWeakrambda（参与者，[]（常量FTraceHandle和handle，FTraceDatum和data）
{
//我的逻辑是这样的；
if（data.OutHits.Num（）>0）
{
常数FHitResult&结果=数据输出[0]；
}
});
FCollisionQueryParams跟踪参数；
trace_params.bReturnPhysicalMaterial=获取材料；
trace_params.bTraceComplex=trace_complex；
跟踪参数AddIgnoredActors（忽略actors）；
返回actor->GetWorld（）->AsyncLineTraceByChannel（EAsyncTraceType:：Single，
开始，结束，
(港澳台)，
跟踪参数，
FCollisionResponseParams:：DefaultResponseParam，
&追踪者）；
}
1>c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h(1008): error C2440: 'return': cannot convert from 'T *' to 'UObject *'
1> with
1> [
1> T=const AActor
1> ]
1> c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h(1008): note: Conversion loses qualifiers
1> c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h(1007): note: while compiling class template member function 'UObject *TWeakBaseFunctorDelegateInstance<UserClass,TTypeWrapper<void> (const FTraceHandle &,FTraceDatum &),FunctorType>::GetUObject(void) const'
1> with
1> [
1> UserClass=const AActor,
1> FunctorType=UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>
1> ]
1> c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h(1019): note: see reference to function template instantiation 'UObject *TWeakBaseFunctorDelegateInstance<UserClass,TTypeWrapper<void> (const FTraceHandle &,FTraceDatum &),FunctorType>::GetUObject(void) const' being compiled
1> with
1> [
1> UserClass=const AActor,
1> FunctorType=UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>
1> ]
1> c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h(1084): note: see reference to class template instantiation 'TWeakBaseFunctorDelegateInstance<UserClass,TTypeWrapper<void> (const FTraceHandle &,FTraceDatum &),FunctorType>' being compiled
1> with
1> [
1> UserClass=const AActor,
1> FunctorType=UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>
1> ]
1> c:\<redacted>\unrealengine\engine\source\runtime\core\public\Delegates/DelegateSignatureImpl.inl(146): note: see reference to class template instantiation 'TWeakBaseFunctorDelegateInstance<UserClass,void (const FTraceHandle &,FTraceDatum &),UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>>' being compiled
1> with
1> [
1> UserClass=const AActor
1> ]
1> C:\<redacted>\Documenten\<redacted>\Unreal\Environments\<redacted>\Plugins\<redacted>\Source\AirBlueprintLib.cpp(571): note: see reference to function template instantiation 'TBaseDelegate<void,const FTraceHandle &,FTraceDatum &> TBaseDelegate<TTypeWrapper<void>,const FTraceHandle &,FTraceDatum &>::CreateWeakLambda<const AActor,UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>,>(UserClass *,FunctorType &&)' being compiled
1> with
1> [
1> UserClass=const AActor,
1> FunctorType=UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>
1> ]
1> C:\<redacted>\Documenten\<redacted>\Unreal\Environments\<redacted>\Plugins\<redacted>\Source\AirBlueprintLib.cpp(564): note: see reference to function template instantiation 'TBaseDelegate<void,const FTraceHandle &,FTraceDatum &> TBaseDelegate<TTypeWrapper<void>,const FTraceHandle &,FTraceDatum &>::CreateWeakLambda<const AActor,UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>,>(UserClass *,FunctorType &&)' being compiled
1> with
1> [
1> UserClass=const AActor,
1> FunctorType=UAirBlueprintLib::GetObstacleAdvAsync::<lambda_628e4b4604e5c1758c2bd3d199f08ff6>
1> ]
1>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets\Microsoft.MakeFile.Targets(44,5): error MSB3075: The command "C:\<redacted>\UnrealEngine\Engine\Build\BatchFiles\Build.bat -Target="ShaderCompileWorker Win64 Development" -Target="<redacted> Win64 Development -Project=\"C:\<redacted_path>"" -WaitMutex -FromMsBuild" exited with code 5. Please verify that you have sufficient rights to run this command.
1>c:\\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h（1008）：错误C2440:“返回”：无法从“T*”转换为“UObject*”
1> 与
1> [
1> T=常数A
1> ]
1> c:\\unrealengine\engine\source\runtime\core\public\Delegates/DelegateInstancesImpl.h（1008）：注意：转换将丢失限定符
1> c:\\unrealengine\engine\source\runtime\core\public\DelegateInstanceSiml.h（1007）：注意：在编译类模板成员函数“UObject*TWeakBaseFunctorDelegateInstance:：GetUObject（void）const”时
1> 与
1> [
1> UserClass=const-AActor，
1> FunctorType=UAirBlueprintLib:：GetObstacleAdvAsync:：
1> ]
1> c:\\unrealengine\engine\source\runtime\core\public\DelegateInstancesImpl.h（1019）：注意：请参阅正在编译的函数模板实例化“UObject*TWeakBaseFunctorDelegateInstance:：GetUObject（void）const”的参考
1> 与
1> [
1> UserClass=const-AActor，
1> FunctorType=UAirBlueprintLib:：GetObstacleAdvAsync:：
1> ]
1> c:\\unrealengine\engine\source\runtime\core\public\DelegateInstanceSiml.h（1084）：注意：请参阅正在编译的类模板实例化“TWeakBaseFunctorDelegateInstance”
1> 与
1> [
1> UserClass=const-AActor，
1> FunctorType=UAirBlueprintLib:：GetObstacleAdvAsync:：
1> ]
1> c:\\unrealengine\engine\source\runtime\core\public\Delegates/DelegateSignatureImpl.inl（146）：注意：请参阅正在编译的类模板实例化'TWeakBaseFunctorDelegateInstance'的参考
1> 与
1> [
1> UserClass=const-AActor
1> ]
1> C:\\Documenten\\Unreal\Environments\\Plugins\\Source\AirBlueprintLib.cpp（571）：注意：请参阅正在编译的函数模板实例化“TBaseDelegate TBaseDelegate:：CreateWeakLambda（UserClass*，FunctorType&）”的参考
1> 与
1> [
1> UserClass=const-AActor，
1> FunctorType=UAirBlueprintLib:：GetObstacleAdvAsync:：
1> ]
1> C:\\Documenten\\Unreal\Environments\\Plugins\\Source\AirBlueprintLib.cpp（564）：注意：请参阅正在编译的函数模板实例化“TBaseDelegate TBaseDelegate:：CreateWeakLambda（UserClass*，FunctorType&）”的参考
1> 与
1> [
1> UserClass=const-AActor，
1> FunctorType=UAirBlueprintLib:：GetObstacleAdvAsync:：
1> ]
1> C:\Program Files（x86）\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets\Microsoft.MakeFile.Targets（44,5）：错误MSB3075:C:\\UnrealEngine\Engine\Build\BatchFiles\Build.bat-Target=“ShaderCompileWorker Win64 Development”-Target=“Win64 Development-Project=\”C:\”“-WaitMutex-FromMsBuild”命令已退出，代码为5。请验证您是否有足够的权限运行此命令。
FTraceDelegate traceDelegate;
traceDelegate.BindLambda([](const FTraceHandle& handle, FTraceDatum& data)
{
DrawDebugPoint(data.PhysWorld.Get(), data.End, 7.0f, FColor::Purple, false, 0.105);
if (data.OutHits.Num() > 0)
{
const FHitResult& Result = data.OutHits[0];
}
});
听起来你好像在某个地方遗漏了一个
#include#include“GameFramework/Actor.h”