unreal engine c++不修改蓝图的情况下调用蓝图多种方式研究

HuldaGnodim · 发表于 2022-12-14 15:51

/方法原型int32 UMyClass::Func(float param1); UFUNCTION(BlueprintCallable)int32 InvokeFunction(UObject* obj, FName functionName,float param1){ struct MyClass_Func_Parms //定义一个结构用来包装参数和返回值，就像在gen.cpp里那样 { float param1; int32 ReturnValue; }; UFunction* func = obj->FindFunctionChecked(functionName); MyClass_Func_Parms params; params.param1=param1; obj->ProcessEvent(func, &params); return params.ReturnValue;}//使用int r=InvokeFunction(obj,"Func",123.f);/调用1obj->ProcessEvent(func, &params);//调用2FFrame frame(nullptr, func, &params, nullptr, func->Children);obj->CallFunction(frame, &params + func->ReturnValueOffset, func);//调用3FFrame frame(nullptr, func, &params, nullptr, func->Children);func->Invoke(obj, frame, &params + func->ReturnValueOffset);template<typename... TReturns, typename... TArgs>void InvokeFunction(UClass* objClass, UObject* obj, UFunction* func, TTuple<TReturns...>& outParams, TArgs&&... args){ objClass = obj != nullptr ? obj->GetClass() : objClass; UObject* context = obj != nullptr ? obj : objClass; uint8* outPramsBuffer = (uint8*)&outParams; if (func->HasAnyFunctionFlags(FUNC_Native)) //quick path for c++ functions { TTuple<TArgs..., TReturns...> params(Forward<TArgs>(args)..., TReturns()...); context->ProcessEvent(func, &params); //copy back out params for (TFieldIterator<UProperty> i(func); i; ++i) { UProperty* prop = *i; if (prop->PropertyFlags & CPF_OutParm) { void* propBuffer = prop->ContainerPtrToValuePtr<void*>(&params); prop->CopyCompleteValue(outPramsBuffer, propBuffer); outPramsBuffer += prop->GetSize(); } } return; } TTuple<TArgs...> inParams(Forward<TArgs>(args)...); void* funcPramsBuffer = (uint8*)FMemory_Alloca(func->ParmsSize); uint8* inPramsBuffer = (uint8*)&inParams; for (TFieldIterator<UProperty> i(func); i; ++i) { UProperty* prop = *i; if (prop->GetFName().ToString().StartsWith("__")) { //ignore private param like __WolrdContext of function in blueprint funcion library continue; } void* propBuffer = prop->ContainerPtrToValuePtr<void*>(funcPramsBuffer); if (prop->PropertyFlags & CPF_OutParm) { prop->CopyCompleteValue(propBuffer, outPramsBuffer); outPramsBuffer += prop->GetSize(); } else if (prop->PropertyFlags & CPF_Parm) { prop->CopyCompleteValue(propBuffer, inPramsBuffer); inPramsBuffer += prop->GetSize(); } } context->ProcessEvent(func, funcPramsBuffer); //call function outPramsBuffer = (uint8*)&outParams; //reset to begin //copy back out params for (TFieldIterator<UProperty> i(func); i; ++i) { UProperty* prop = *i; if (prop->PropertyFlags & CPF_OutParm) { void* propBuffer = prop->ContainerPtrToValuePtr<void*>(funcPramsBuffer); prop->CopyCompleteValue(outPramsBuffer, propBuffer); outPramsBuffer += prop->GetSize(); } }}#include "OutputDevice.h" FString cmd = FString::Printf(TEXT("TestFun HelloWorld")); FOutputDeviceDebug device; 实例对象->CallFunctionByNameWithArguments(*cmd, device, NULL, true);//调用通过蓝图actor调用蓝图函数void AMyActor::CallActorFunc(AActor * c, FString funcName){ FOutputDeviceNull ar; c->CallFunctionByNameWithArguments(*funcName, ar, NULL, true);}
https://zhuanlan.zhihu.com/p/61042237
https://www.unrealengine.com/en-US/search?x=0&y=0&filter=All&keyword=CallFunctionByNameWithArguments
https://docs.unrealengine.com/5.0/en-US/API/Runtime/CoreUObject/UObject/UObject/CallFunctionByNameWithArguments/
https://blog.csdn.net/qq_35014708/article/details/84569831

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