C / C++ / MFC

CString portname;
myEditBox.GetWindowText(portname);
COMstream =  open_host_port(portname);

portstream_fd open_host_port(char *portname)

COMstream = open_host_port((LPSTR)(LPCSTR) testCStr);

SetWindowLong(mHwnd, GWL_USERDATA, (long)((void*)this));
mOldWndProc = (WNDPROC)GetWindowLong(mHwnd, GWL_WNDPROC);

SetWindowLong(mHwnd, GWL_WNDPROC, (long)stWinMsgHandler);

LRESULT CALLBACK cStaticLink::stWinMsgHandler(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    cStaticLink *pWnd;

    // get the pointer to the window
    pWnd = (cStaticLink*)GetWindowLong(hwnd, GWL_USERDATA);

    // if we have the pointer, go to the message handler of the window
    // else, use DefWindowProc
    if (pWnd)
        return pWnd->WndProc(hwnd, uMsg, wParam, lParam);
    else
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
}