Hi, I'm trying to create a HelloWorld example c++ project but am getting this error from TS when calling it: "Invalid number of parameters were passed to a user dll function".
I'm not a c++ programmer but a C# programmer creating a wrapper for C# COM.

Here's the code:

------------------------------------------------------------------
The c++ code:
-----------------------------------------------------------------
COMTestingInterop.h:
// COMTESTINGINTEROP.h - Contains declarations of functions
#pragma once

#ifdef COMTESTINGINTEROP_EXPORTS
#define COMTESTINGINTEROP_API __declspec(dllexport)
#else
#define COMTESTINGINTEROP_API __declspec(dllimport)
#endif

extern "C" COMTESTINGINTEROP_API LPSTR hello(LPSTR world);
------------------------------------------------------------------------
ComTestingInterop.cpp:
#include "pch.h"
#include "COMTestingInterop.h"

LPSTR hello(char* world)
{
return LPSTR(world);
}
----------------------------------------------------------------------------------

EasyLanguage:
DefineDLLFunc: "COMTestingInterop.dll",LPSTR,"hello",LPSTR; {World} ;

Vars:
World( "Hey from TS" ) ;

once clearprintlog;
print(hello(World));

--------------------------------------------------------------------------------
If I remove the arguments, and return from the cpp function:
return LPSTR("hello from cpp");
It gets passed back to TS and prints to the log fine. The issue seems to be isolated to being able to add and pass arguments.

Hello TheMetalDog,

First, let me say I am making a suggestion without trying. Sorry, but I'm on the road and don't have access to a computer with a compiler.

The signature of your function does not exactly match. LPSTR is Microsoft's "long pointer to a unicode string" if I remember correctly. The "char *" is a pointer to a character. Not identical in the C/C++ domain.


LPSTR hello(LPSTR world)
{
return LPSTR(world);
}

Try that and let me know if it works. Good luck!