Module loading and unloading when calling createwindow-CodePudding

I am trying to create a simple dropdown menu in a dialog box. Here is the bit of code that actually does it:

BOOL CALLBACK Remove(HWND hDlgc, UINT message, WPARAM wParam, LPARAM lParam)
//message handler for remove category box
{
    //UNREFERENCED_PARAMETER(lParam);

    HINSTANCE current = GetModuleHandle(NULL);


    //GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_PIN, "comctl32.dll", NULL);

  CreateWindow(WC_COMBOBOXW, _TEXT(""), CBS_DROPDOWN | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE, 100, 100, 200, 200, hDlgc, NULL, NULL, NULL, NULL);

This will work and it will show the combo box, but only after waiting for 2 minutes or so... very undesirable! my program will go into a not responding state before the combo box shows up. The output shows that comctl32.dll get loaded and unloaded about 1500 times before the combo box shows up. When it does, it is still unresponsive and I have to wait more until it begins to work. I tried pinning the module to stop the loading and unloading but that did not do anything. Any help appreciated. As you can see I am very new to win32 programming. I got the backend of my program to work nicely, its just this gui that is bugging me.

EDIT: here is the as short as i could get it code. Just create a blank desktop project in VS, and then replace the "about" function in the bottom with the following: (and also include commctrl.h)

INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    HWND dd_Hand = CreateWindow(WC_COMBOBOXW, _TEXT(""), CBS_DROPDOWNLIST | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE,
        20, 20, 200, 200, hDlg, NULL, NULL, NULL);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}

If I do this, I get the symptoms described previously.

EDIT AGAIN: I put the createwindow function for the combobox into the WM_CREATE case of WndProc, and everything works as it should, loads instantly. I am starting to doubt that this is the right way to create a combobox within a dialog box. Any suggestions for doing this another way (havent been able to find a way to do this with a splitbutton resource) are also welcome.

CodePudding user response：

Solution was simple. just put this code:

HWND dd_Hand = CreateWindow(WC_COMBOBOXW, _TEXT(""), CBS_DROPDOWNLIST | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE,
        20, 20, 200, 200, hDlg, NULL, NULL, NULL);

and the code that loads the combobox so it runs only once. No more problems. Also another even simpler way to do this would be to create a combobox resource and use the SendMessage() function.