Question

I have a simple problem with integrating Lua with c++.
I have my project in Visual Studio :
https://i.stack.imgur.com/nNw6H.png

and I run my lua_init() function :

bool lua_init(std::string &luaScriptName){
// Create the Lua state. Explanation from Lua 5.1 Ref. Manual:

globalL = luaL_newstate(); // 5.1 OK - Lua 5.0 or lower will probably require different commands

if( globalL == NULL )
    return false;

    // Loads all Lua standard libraries
luaL_openlibs(globalL);  // 5.1 OK - Lua 5.0 or lower will require different commands

// This lot below could be replaced with luaL_dofile, but that just does: luaL_loadfile(..) || lua_pcall(..), which gives no reporting of error messages etc.
int initError = luaL_loadfile(globalL,luaScriptName.c_str());
switch( initError )
{
    case 0:
        // The file loaded okay, so call it as a protected function - to stop fatal errors from exiting the program
        lua_pcall(globalL,0,0,0);
        break;
    case LUA_ERRFILE:
        std::cerr<<"Cannot find / open lua script file: "<<luaScriptName<<std::endl<<"Skipping Lua init."<<std::endl;
        break;
    case LUA_ERRSYNTAX:
        std::cerr<<"Syntax error during pre-compilation of script file: " <<luaScriptName<<std::endl<<"Skipping Lua init."<<std::endl;
        break;
    case LUA_ERRMEM:
        // Treating this as fatal, since it means other Lua calls are unlikely to work either
        std::cerr<<"Fatal memory allocation error during processing of script file: " <<luaScriptName<<std::endl;
        return false;
}
return true;

}

but don’t know I get the “Cannot find / open lua script file:” error

should I point somehow my script.lua to the Visual Studio ? the file is located in the project directory.

Answer 1

Your code will exectue where the binary is, or in the target directory in Debugging Mode. So check that your lua file is accessible to your binary when you execute it. If it’s with your source files, sure, it’s not accessible.