C#.Net Calling a C++ DLL - c++

Question

I got a DLL(without the sourcecode) which exports like this:
?ReceiveCoreDataPtr##YAXPAX#Z
?xenoAddRigidBodyAngularImpulse##YAXHMMM#Z
?xenoAddRigidBodyForce##YAXHMMM#Z
?xenoAddRigidBodyForce##YAXHMMMMMM#Z
?xenoAddRigidBodyLinearImpulse##YAXHMMM#Z
?xenoAddRigidBodyPointImpulse##YAXHMMMMMM#Z
?xenoAddRigidBodyTorque##YAXHMMM#Z
?xenoCharacterControllerCrouch##YAXH#Z
?xenoCharacterControllerJump##YAXH#Z
?xenoCharacterDisable##YAXH#Z
?xenoCharacterEnable##YAXH#Z
?xenoDeleteRigidBody##YAXH#Z
?xenoEnd##YAXXZ
?xenoGetCameraFOV##YAKH#Z
?xenoGetCameraPointX##YAKH#Z
?xenoGetCameraPointY##YAKH#Z
?xenoGetCameraPointZ##YAKH#Z
?xenoGetCameraPositionX##YAKH#Z
?xenoGetCameraPositionY##YAKH#Z
?xenoGetCameraPositionZ##YAKH#Z
?xenoGetCharacterControllerHeadPosition##YAKH#Z
?xenoGetCharacterControllerPositionX##YAKH#Z
?xenoGetCharacterControllerPositionY##YAKH#Z
?xenoGetCharacterControllerPositionZ##YAKH#Z
?xenoGetCharacterControllerRotation##YAKH#Z
?xenoGetRigidBodyAllowedPenetrationDepth##YAKH#Z
?xenoGetRigidBodyAngularDamping##YAKH#Z
?xenoGetRigidBodyAngularVelocityX##YAKH#Z
?xenoGetRigidBodyAngularVelocityY##YAKH#Z
?xenoGetRigidBodyAngularVelocityZ##YAKH#Z
?xenoGetRigidBodyFriction##YAKH#Z
?xenoGetRigidBodyGravityFactor##YAKH#Z
?xenoGetRigidBodyLinearDamping##YAKH#Z
?xenoGetRigidBodyLinearVelocityX##YAKH#Z
?xenoGetRigidBodyLinearVelocityY##YAKH#Z
?xenoGetRigidBodyLinearVelocityZ##YAKH#Z
?xenoGetRigidBodyMass##YAKH#Z
?xenoGetRigidBodyMaxAngularVelocity##YAKH#Z
?xenoGetRigidBodyMaxLinearVelocity##YAKH#Z
?xenoGetRigidBodyPointVelocityX##YAKHMMM#Z
?xenoGetRigidBodyPointVelocityY##YAKHMMM#Z
?xenoGetRigidBodyPointVelocityZ##YAKHMMM#Z
?xenoGetRigidBodyRestitution##YAKH#Z
?xenoIsRigidBodyALadder##YAHH#Z
?xenoMakeCamera##YAXHH#Z
?xenoMakeCharacterController##YAXHMM#Z
?xenoMakeCharacterController##YAXHMMM#Z
?xenoMakeCharacterController##YAXHMMMM#Z
?xenoMakeCharacterController##YAXHMMMMM#Z
?xenoMakeCharacterController##YAXHMMMMMM#Z
?xenoMakeCharacterController##YAXHMMMMMMM#Z
?xenoMakeRigidBodyDynamicBox##YAXH#Z
?xenoMakeRigidBodyDynamicBox##YAXHM#Z
?xenoMakeRigidBodyDynamicCapsule##YAXH#Z
?xenoMakeRigidBodyDynamicCapsule##YAXHM#Z
?xenoMakeRigidBodyDynamicCylinder##YAXH#Z
?xenoMakeRigidBodyDynamicCylinder##YAXHM#Z
?xenoMakeRigidBodyDynamicSphere##YAXH#Z
?xenoMakeRigidBodyDynamicSphere##YAXHM#Z
?xenoMakeRigidBodyStaticBox##YAXH#Z
?xenoMakeRigidBodyStaticCapsule##YAXH#Z
?xenoMakeRigidBodyStaticCylinder##YAXH#Z
?xenoMakeRigidBodyStaticSphere##YAXH#Z
?xenoMakeRigidBodyStaticTriangleMesh##YAXH#Z
?xenoMakeVehicle##YAXHH#Z
?xenoMoveCharacterControllerBackward##YAXH#Z
?xenoMoveCharacterControllerForward##YAXH#Z
?xenoMoveCharacterControllerLeft##YAXH#Z
?xenoMoveCharacterControllerRight##YAXH#Z
?xenoSetCharacterControllerPosition##YAXHMMM#Z
?xenoSetCharacterControllerRotation##YAXHM#Z
?xenoSetGravity##YAXM#Z
?xenoSetGravity##YAXMMM#Z
?xenoSetRigidBodyAllowedPenetrationDepth##YAXHM#Z
?xenoSetRigidBodyAngularDamping##YAXHM#Z
?xenoSetRigidBodyAngularVelocity##YAXHMMM#Z
?xenoSetRigidBodyAsLadder##YAXHH#Z
?xenoSetRigidBodyFriction##YAXHM#Z
?xenoSetRigidBodyGravityFactor##YAXHM#Z
?xenoSetRigidBodyLinearDamping##YAXHM#Z
?xenoSetRigidBodyLinearVelocity##YAXHMMM#Z
?xenoSetRigidBodyMass##YAXHM#Z
?xenoSetRigidBodyMaxAngularVelocity##YAXHM#Z
?xenoSetRigidBodyMaxLinearVelocity##YAXHM#Z
?xenoSetRigidBodyPosition##YAXHMMM#Z
?xenoSetRigidBodyRestitution##YAXHM#Z
?xenoSetRigidBodyRotation##YAXHMMM#Z
?xenoSetTimeStep##YAXM#Z
?xenoStart##YAXH#Z
?xenoStart##YAXHM#Z
?xenoStart##YAXHMH#Z
?xenoStart##YAXXZ
?xenoUpdate##YAXXZ
?xenoVehicleAccelerate##YAXHM#Z
?xenoVehicleHandbrake##YAXH#Z
?xenoVehicleReverse##YAXH#Z
?xenoVehicleTurn##YAXHM#Z
When I try to use it in another C++ App like this
#include <windows.h>
class XenoPhysics
{
private:
typedef void (*FunctionFunc)(void);
typedef void (*FunctionFuncFloat)(float);
typedef void (*FunctionFuncInt)(int);
typedef void (*FunctionIntFloatFloatFloat)(int,float,float,float);
HMODULE libInstance;
public:
void LoadLib()
{
this->libInstance = LoadLibrary(L"F:\\xenophysics.dll");
}
void UnloadLib()
{
FreeLibrary(libInstance);
}
void xStart()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(this->libInstance, "?xenoStart##YAXXZ");
curFunc();
}
void xEnd()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(libInstance, "xenoEnd");
curFunc();
}
void xUpdate()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(libInstance, "xenoUpdate");
curFunc();
}
void xMakeRigidBodyStaticBox(int objid)
{
FunctionFuncInt curFunc;
curFunc = (FunctionFuncInt)GetProcAddress(libInstance, "xenoMakeRigidBodyStaticBox");
curFunc(objid);
}
void xMakeRigidBodyDynamicBox(int objid)
{
FunctionFuncInt curFunc;
curFunc = (FunctionFuncInt)GetProcAddress(libInstance, "xenoMakeRigidBodyDynamicBox");
curFunc(objid);
}
void xSetRigidBodyPosition(int objid, float x, float y, float z)
{
FunctionIntFloatFloatFloat curFunc;
curFunc = (FunctionIntFloatFloatFloat)GetProcAddress(libInstance, "xenoSetRigidBodyPosition");
curFunc(objid, x, y, z);
}
void xSetGravity(float grav)
{
FunctionFuncFloat curFunc;
curFunc = (FunctionFuncFloat)GetProcAddress(libInstance, "xenoSetGravity");
curFunc(grav);
}
};
This is the "wrapper"(or whatever you would call it) class.. To call the functions I'm doing
XenoPhysics * d = new XenoPhysics();
d->LoadLib();
d->xStart();
It then throws the following error at me(Note that it passes the LoadLib() without any errors)
Unhandled exception at 0x50261bc9 in Xeno Test.exe: 0xC0000005: Access violation reading location 0x00000064.
And yes; I've checked that the "curFunc" gets the address, not just a NULL pointer(atleast I think I've checked that)..
Anyone who can help out?
Edit: Forgot the C#.Net code, how stupid of me :3
Here is the C++ CLR DLL "wrapper" I tried to make:
#include <windows.h>
// The following ifdef block is the standard way of creating macros which make exporting
// from a DLL simpler. All files within this DLL are compiled with the XENOWRAPPERWIN32_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see
// XENOWRAPPERWIN32_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifdef XENOWRAPPERWIN32_EXPORTS
#define XENOWRAPPERWIN32_API __declspec(dllexport)
#else
#define XENOWRAPPERWIN32_API __declspec(dllimport)
#endif
typedef void (*FunctionFunc)();
typedef void (*FunctionFuncFloat)(float);
typedef void (*FunctionFuncInt)(int);
typedef void (*FunctionIntFloatFloatFloat)(int,float,float,float);
// This class is exported from the xeno wrapper win32.dll
class XENOWRAPPERWIN32_API Cxenowrapperwin32 {
public:
Cxenowrapperwin32(void);
HINSTANCE libInstance;
// FunctionFunc curFunc;
// Library base functions
void LoadLib()
{
libInstance = LoadLibrary(L"F:\\xenophysics.dll");
}
void UnloadLib()
{
FreeLibrary(libInstance);
}
// Function calls to the xeno physics
void xStart()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(libInstance, "?xenoStart##YAXXZ");
curFunc();
}
void xEnd()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(libInstance, "?xenoEnd##YAXXZ");
curFunc();
}
void xUpdate()
{
FunctionFunc curFunc;
curFunc = (FunctionFunc)GetProcAddress(libInstance, "?xenoUpdate##YAXXZ");
curFunc();
}
void xMakeRigidBodyStaticBox(int objid)
{
FunctionFuncInt curFunc;
curFunc = (FunctionFuncInt)GetProcAddress(libInstance, "?xenoMakeRigidBodyStaticBox##YAXH#Z");
curFunc(objid);
}
void xMakeRigidBodyDynamicBox(int objid)
{
FunctionFuncInt curFunc;
curFunc = (FunctionFuncInt)GetProcAddress(libInstance, "?xenoMakeRigidBodyDynamicBox##YAXH#Z");
curFunc(objid);
}
void xSetRigidBodyPosition(int objid, float x, float y, float z)
{
FunctionIntFloatFloatFloat curFunc;
curFunc = (FunctionIntFloatFloatFloat)GetProcAddress(libInstance, "?xenoSetRigidBodyPosition##YAXHMMM#Z");
curFunc(objid, x, y, z);
}
void xSetGravity(float grav)
{
FunctionFuncFloat curFunc;
curFunc = (FunctionFuncFloat)GetProcAddress(libInstance, "?xenoSetGravity##YAXM#Z");
curFunc(grav);
}
};
extern XENOWRAPPERWIN32_API int nxenowrapperwin32;
XENOWRAPPERWIN32_API int fnxenowrapperwin32(void);
and here is how I use it in C#.Net
class xeno
{
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?LoadLib#Cxenowrapperwin32##QAEXXZ")]
public static extern void xLoadLib();
public void LoadLib()
{
xLoadLib();
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?UnloadLib#Cxenowrapperwin32##QAEXXZ")]
public static extern void xUnloadLib();
public void UnloadLib()
{
xUnloadLib();
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xStart#Cxenowrapperwin32##QAEXXZ")]
public static extern void xStart();
public void Start()
{
xStart();
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xUpdate#Cxenowrapperwin32##QAEXXZ")]
public static extern void xUpdate();
public void Update()
{
xUpdate();
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xEnd#Cxenowrapperwin32##QAEXXZ")]
public static extern void xEnd();
public void End()
{
xEnd();
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xMakeRigidBodyDynamicBox#Cxenowrapperwin32##QAEXH#Z")]
public static extern void xMakeRigidBodyDynamicBox(int objid);
public void MakeRigidBodyDynamicBox(int id)
{
xMakeRigidBodyDynamicBox(id);
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xMakeRigidBodyStaticBox#Cxenowrapperwin32##QAEXH#Z")]
public static extern void xMakeRigidBodyStaticBox(int objid);
public void MakeRigidBodyStaticBox(int id)
{
xMakeRigidBodyStaticBox(id);
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xSetGravity#Cxenowrapperwin32##QAEXM#Z")]
public static extern void xSetGravity(float grav);
public void SetGravity(float g)
{
xSetGravity(g);
}
[DllImport("C:\\Users\\hayer\\Documents\\Visual Studio 2008\\Projects\\xeno wrapper win32\\Debug\\xeno wrapper win32.dll", EntryPoint = "?xSetRigidBodyPosition#Cxenowrapperwin32##QAEXHMMM#Z")]
public static extern void xSetRigidBodyPosition(int obj, float x, float y, float z);
public void SetRigidBodyPosition(int id, float q, float w, float e)
{
xSetRigidBodyPosition(id, q, w, e);
}
}
And in the main C#.Net program I do
xeno tx = new xeno();
tx.Start();
tx.SetGravity(-1);
tx.MakeRigidBodyStaticBox(ground.Id);
tx.MakeRigidBodyDynamicBox(cube.Id);
tx.SetRigidBodyPosition(cube.Id, 0, 50, 0);

Answer 1

You must use proper calling conversion and parameters.