I'm trying to make my player base class and I am extending the Base First Person Character with my own input actions.
This is the line that is failing the build:
protected:
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="Input")
UInputAction* StaminaAction;
Here is the Error I'm getting:
unresolved external symbol "__declspec(dllimport) class UClass *
__cdecl Z_Construct_UClass_UInputAction_NoRegister(void)" (_imp?Z_Construct_UClass_UInputAction_NoRegister##YAPEAVUClass##XZ) referenced in function "void __cdecl `dynamic initializer for 'public: static struct UECodeGen_Private::FObjectPropertyParams const Z_Construct_UClass_AMirrorMainPlayerBase_Statics::NewProp_StaminaAction''(void)" (??__E?NewProp_StaminaAction#Z_Construct_UClass_AMirrorMainPlayerBase_Statics##2UFObjectPropertyParams#UECodeGen_Private##B##YAXXZ)
If it matters, here are my includes:
#include "InputActionValue.h"
#include "EnhancedInput/Public/InputAction.h"
#include "EnhancedInputComponent.h"
Related
All of a sudden, after my tests had been working for hours, I'm getting errors that it can't find my text fixture functions (SetUp/TearDown). I'd had the fixture defined in a separate file, so as a quick fix I moved the class to the test file, but I still get the same problem!
Here's the current file. I didn't just omit the code for brevity, I've tried building it in this form to make sure the problem isn't somehow caused by the code inside the tests. I've left in the includes though.
#include "memory"
#include "../TestUtility/TestUtility.h"
#include "DependencyInjector.h"
#include "gtest/gtest.h"
#include "RecoverableErrorException.h"
namespace Test
{
class DependencyInjectorTest : public testing::Test
{
public:
DependencyInjectorTest();
virtual ~DependencyInjectorTest();
protected:
virtual void SetUp() { Framework::DependencyInjector::Destroy(); };
virtual void TearDown() override;
};
TEST_F ( DependencyInjectorTest, FindEmpty )
{
// content ommitted
}
TEST_F ( DependencyInjectorTest, Add )
{
// content ommitted
}
TEST_F ( DependencyInjectorTest, Find )
{
// content ommitted
}
} // namespace Test
And here are the errors:
1>DependencyInjectorUnitTests.obj : error LNK2019: unresolved external symbol "public: __thiscall Test::DependencyInjectorTest::DependencyInjectorTest(void)" (??0DependencyInjectorTest#Test##QAE#XZ) referenced in function "public: __thiscall Test::DependencyInjectorTest_Add_Test::DependencyInjectorTest_Add_Test(void)" (??0DependencyInjectorTest_Add_Test#Test##QAE#XZ)
1>DependencyInjectorUnitTests.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall Test::DependencyInjectorTest::~DependencyInjectorTest(void)" (??1DependencyInjectorTest#Test##UAE#XZ) referenced in function "public: virtual __thiscall Test::DependencyInjectorTest_Add_Test::~DependencyInjectorTest_Add_Test(void)" (??1DependencyInjectorTest_Add_Test#Test##UAE#XZ)
1>DependencyInjectorUnitTests.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall Test::DependencyInjectorTest::TearDown(void)" (?TearDown#DependencyInjectorTest#Test##MAEXXZ)
UPDATE: The errors disappeared at some point. And then a few hours later, just as mysteriously and frustratingly, came back. Even on files I hadn't worked on since it was fine.
You need to define the constructor, destructor and TearDown methods of DependencyInjectorTest. Even if they are virtual, the compiler needs basic methods to initialize the vtable.
https://en.cppreference.com/w/cpp/language/virtual
By declaring them in the class definition, the macros used them implicitly, and they need to be defined. As they're not, linking results in an undefined symbol error.
You can either remove the declarations or define the functions.
I am defining a class in a header file. It's inheritence from another class named AGameMode. In the editor i am creating new class from Gamemode and it's auto generates .h and .cpp files. Problem is, i already include the necessary header files still can't see the class i want to inheritence from it. Instead of it throws me error. Let me explain with code:
//ACollectorMan_GameMode.h
#include "CoreMinimal.h"
#include "GameFramework/GameMode.h"
#include "CollectorMan_GameMode.generated.h"
UCLASS()
class MYPROJECT2_API ACollectorMan_GameMode : public AGameMode
{
GENERATED_BODY()
ACollectorMan_GameMode();
}
when i declare the constructer and compile it shows me error. But if i won't declare it, in the editor line 7(class MYPROJECT2_API ACollectorMan_GameMode : public AGameMode) won't be throw error(still will be red).
This is not only for Gamemode parent class. Character or Pawn classes have same problem. When i build VS gives me that error :
CollectorMan_GameMode.cpp.obj : error LNK2019: unresolved external symbol "private: __cdecl ACollectorMan_GameMode::ACollectorMan_GameMode(void)" (??0ACollectorMan_GameMode##AEAA#XZ) referenced in function "public: static void __cdecl ACollectorMan_GameMode::__DefaultConstructor(class FObjectInitializer const &)" (?__DefaultConstructor#ACollectorMan_GameMode##SAXAEBVFObjectInitializer###Z)
CollectorMan_GameMode.gen.cpp.obj : error LNK2001: unresolved external symbol "private: __cdecl ACollectorMan_GameMode::ACollectorMan_GameMode(void)" (??0ACollectorMan_GameMode##AEAA#XZ)
This should be a linker problem however "GameMode.h" file available at "GameFramework/GameMode.h". I can show you a similiar file. But it's works. There is an example:
#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "MyProject2GameMode.generated.h"
UCLASS()
class AMyProject2GameMode : public AGameModeBase
{
GENERATED_BODY()
AMyProject2GameMode();
};
That all i say.
Thanks in advance.
I am getting an error in Visual Studio when compiling my program.
Error LNK2019 unresolved external symbol "public: __cdecl
Grid::Grid(void)" (??0Grid##QEAA#XZ) referenced in function
main Grid C:\Users\Ryan\Desktop\Dev\Grid\Grid\main.obj 1
Error LNK2019 unresolved external symbol "public: __thiscall
Grid::~Grid(void)" (??1Grid##QAE#XZ) referenced in function
_main Grid C:\Users\Ryan\Desktop\Dev\Grid\Grid\main.obj 1
This project works fine at my university but not on my own computer and I am not sure what is wrong.
My main.cpp:
#include <iostream>
#include "Grid.h"
using namespace std;
int main(int args, char **argv)
{
Grid grid;
// grid.LoadGrid("Grid1.txt");
// grid.SaveGrid("OutGrid.txt");
system("pause");
}
And my header file:
#pragma once
class Grid
{
public:
Grid();
~Grid();
void LoadGrid(const char filename[]);
void SaveGrid(const char filename[]);
private:
int m_grid[9][9];
};
Any help at all is appreciated, thanks.
Issue resolved from advise given on [error LNK2019: unresolved external symbol "public: __thiscall : constructor issue
"First in the library project do rightclick->properties, then under the tab General, Configuration Type should be Static library (.lib)."
Thanks everyone for your answers.
As per my understanding your grid class constructor and destractor implementation are missing. You should check your .cpp file, implemention like this
Grid(){}
~ Grid(){}
This question already has answers here:
Why can templates only be implemented in the header file?
(17 answers)
Closed 8 years ago.
Right I am getting weird linker errors which I've never seen before and which I can't really decipher.
Code for the RelationOwner and RelationUser can be found there. One remark: I've moved all function bodies to the source file instead of the header file. Naming has stayed the same.
Error 1 error LNK2019: unresolved external symbol "public: __thiscall RelationUser<class Family,class Citizen>::RelationUser<class Family,class Citizen>(class Family *)" (??0?$RelationUser#VFamily##VCitizen####QAE#PAVFamily###Z) referenced in function "public: __thiscall Citizen::Citizen(class Family &,class Name)" (??0Citizen##QAE#AAVFamily##VName###Z) *path*\Citizen.obj CodeAITesting
Error 2 error LNK2019: unresolved external symbol "public: __thiscall RelationUser<class Family,class Citizen>::~RelationUser<class Family,class Citizen>(void)" (??1?$RelationUser#VFamily##VCitizen####QAE#XZ) referenced in function __unwindfunclet$??0Citizen##QAE#AAVFamily##VName###Z$1 *path*\Citizen.obj CodeAITesting
Error 3 error LNK2019: unresolved external symbol "public: __thiscall RelationOwner<class Family,class Citizen>::~RelationOwner<class Family,class Citizen>(void)" (??1?$RelationOwner#VFamily##VCitizen####QAE#XZ) referenced in function __unwindfunclet$??0Family##QAE#VName###Z$1 *path*\Family.obj CodeAITesting
The first one is about a constructor and the second two are about the destructor. That I understand.
I've also implemented my own version of the User and Owner as the following:
// header of Family.h (Owner in the linked PDF file)
#include "Name.h"
#include "RelationOwner.h"
class Citizen;
class Family; // I didn't really know if this one was necessary.
class Family
: public RelationOwner<Family, Citizen>
{
public:
Family(Name name);
private:
Name name;
};
// Source of Family.cpp
#include "Name.h"
Family::Family(Name name)
: name(name)
{
}
//Source of Citizen.h (User in the linked PDF)
#include "Name.h"
#include "RelationUser.h"
class Citizen;
class Family;
class Citizen
: public RelationUser<Family, Citizen>
{
public:
Citizen(Family &family, Name name);
private:
Name name;
};
// Source of Citizen.cpp
#include "Family.h"
#include "Name.h"
#include "RelationUser.h"
Citizen::Citizen(Family &family, Name name)
: RelationUser<Family, Citizen>(&family),
name(name)
{
}
As far as I know I am not doing anything fancypancy, yet it is complaining big time and I don't know why.
Well as Brian Beuning told me "usually the code for a template is in the header file".
And after reading n.m.'s linked possible duplicate I moved the implementation back to the header file and, it worked.
I guess that the duplicate question was spot on.
Hi i'm getting the following errors:
Error 9 error LNK1120: 2 unresolved externals
Error 8 error LNK2019: unresolved external symbol "public: virtual __thiscall physics::~physics(void)" (??1physics##UAE#XZ) referenced in function "public: virtual void * __thiscall physics::`scalar deleting destructor'(unsigned int)" (??_Gphysics##UAEPAXI#Z)
Error 7 error LNK2019: unresolved external symbol "public: virtual __thiscall student::~student(void)" (??1student##UAE#XZ) referenced in function __unwindfunclet$??0physics##QAE#XZ$0
which occur using the following code:
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class student{
protected:
string fName,sName;
int id;
vector<string> cname;
vector<int> cmark;
public:
virtual ~student();
virtual void addCourse(string name, int mark)=0;
};
class physics : public student{
public:
physics(){//Initialize default values
fName="blank";
sName="blank";
id=0;
cname.push_back("none");
cmark.push_back(0);
};
~physics();
void addCourse(string name, int mark){
if(cname.size()==1){//override default value for a size of 1
cname[0]=name;
cmark[0]=mark;
}
else{
cname.push_back(name);
cmark.push_back(mark);
}
}
};
The above compiles fine but when i try to initialize an object in main() by using:
int main(){
//Database Storage
vector<student*> DB;
DB.push_back(new physics);
}
That's when i get the errors (removing the push_back line fixes it but i need this for my program). What am i doing wrong?
Turns out adding braces to the end of the destructors fixed it. What difference does that make? (from the comments)
The difference is that in one case you have a declaration which lacks a definition; in the second case you provide a (empty) definition inline.
Trying to invoke a function that is declared but not defined (as in the first case) result in an unresolved reference error raised by the linker - after all, what should it do when a function invocation is found for a function whose implementation is not available?