IPCPFunc.cpp

IPCFunc::IPCFunc(void* funcPtr, int cPars) {
    this->pFunc = (IntPtr)funcPtr;
    this->cPars = cPars;
    this->parameters = new int[cPars];
}

extern "C" int IPCFunc::invoke() {
    // Create function signature based on cArgs
    if (cPars == 0)
        return ((int(*)())pFunc)();

    auto funcPtr = (int(*)())pFunc;
    int returnValue(0);

    int n_stack = cPars * sizeof(int);
    int p_stack = 0;

    __asm {
        sub esp, n_stack;
        push parameters;
        call funcPtr;           // call the function
        mov returnValue, eax;   // Save the return value from the function return value register
        pop n_stack;            // resume normal functionality
        add esp, n_stack;
    }

    return returnValue;
}