Call winapis from chai script

chaiwinapi.cpp

#include <string>
#include<vector>
#include <chaiscript/chaiscript.hpp>
#include<windows.h>

unsigned int proxy_LoadLibraryA(unsigned int libName)
{
    return (unsigned int)LoadLibraryA((char*)libName);
}

unsigned int proxy_GetProcAddress(unsigned int module,unsigned int procName)
{
    return (unsigned int)GetProcAddress((HMODULE)module, (char*)procName);
}

unsigned int ExecMem4(unsigned int mem, unsigned int a, unsigned int b, unsigned int c, unsigned int d)
{
    _asm {
        push a
        push b
        push c
        push d
        call [mem]
    }
}

unsigned int CSTR(const std::string& text)
{
    return (unsigned int)text.c_str();
}

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR cmd, int n) {
    chaiscript::ChaiScript chai;
    chai.add(chaiscript::fun(&proxy_LoadLibraryA), "LoadLibraryA");
    chai.add(chaiscript::fun(&proxy_GetProcAddress), "GetProcAddress");
    chai.add(chaiscript::fun(&ExecMem4), "ExecMem4");
    chai.add(chaiscript::fun(&CSTR), "CSTR");
    
    try {
        chai.eval(R"(
        def CallWinApi(lib, name, args)
        {
            var mod = LoadLibraryA(CSTR(lib));
            var proc = GetProcAddress(mod, CSTR(name));
            switch(args.size())
            {
                
                case (4){
                    ExecMem4(proc, args[0],args[1],args[2],args[3]);
                }
default {
    //not implemented yet
}
            }
        }

        CallWinApi("user32.dll","MessageBoxA", [0, CSTR("hi"),CSTR("chai"),0]);
        
  )");
    }
    catch (const chaiscript::exception::eval_error& e) {
        MessageBoxA(NULL,e.pretty_print().c_str(),"error",0);
    }
}