I was told recently that in WM_PAINT: message I should only use BeginPaint() and EndPaint() .

But what when I need multiple windows with bitmaps or drawings in my main window? How should I manage this in proper way?

So far I was using this routines, that worked for me and was logic for me. Is it wrong? What is the proper way?

Thank You in advance.

case WM_PAINT:
{
    // main window - that contains other sub windows
    PAINTSTRUCT ps;
        HDC hdc = BeginPaint(_hwnd, &ps);
        EndPaint(_hwnd, &ps);

    // a window that shows a 256x256 texture:
        PAINTSTRUCT ps_texture_256;
        HDC hdc_texture_256 = BeginPaint(GetDlgItem(_hwnd, IDS_DC_TEXTURE_256), &ps_texture_256);

            HDC hdc_tmp_256 = CreateCompatibleDC(hdc_texture_256);
            SelectObject(hdc_tmp_256, convert_hbm_texture_256);
            BitBlt(hdc_texture_256, 0, 0, 256, 256, hdc_tmp_256, 0, 0, SRCCOPY);
            DeleteObject(convert_hbm_texture_256);
            DeleteDC(hdc_tmp_256);

        EndPaint(GetDlgItem(_hwnd, IDS_DC_TEXTURE_256), &ps_texture_256);

    // a smaller window that shows 128x128 texture:
        PAINTSTRUCT ps_texture_128;
        HDC hdc_texture_128 = BeginPaint(GetDlgItem(_hwnd, IDS_DC_TEXTURE_128), &ps_texture_128);

            HDC hdc_tmp_128 = CreateCompatibleDC(hdc_texture_128);
            SelectObject(hdc_tmp_128, convert_hbm_texture_128);
            BitBlt(hdc_texture_128, 0, 0, 128, 128, hdc_tmp_128, 0, 0, SRCCOPY);
            DeleteObject(convert_hbm_texture_128);
            DeleteDC(hdc_tmp_128);

        EndPaint(GetDlgItem(_hwnd, IDS_DC_TEXTURE_128), &ps_texture_128);

        return (INT_PTR)TRUE;
}