Host a standard WinRT XAML control in a C++ desktop (Win32) app - Question

[petr-larin]

Hi!

I'm following the tutorial Host a standard WinRT XAML control in a C++ desktop (Win32) app

and was wondering what is the purpose of this line in the code sample:

case WM_CREATE: _childhWnd = CreateWindowEx(0, L"ChildWClass", NULL, WS_CHILD | WS_BORDER, 0, 0, 0, 0, hWnd, NULL, _hInstance, NULL);

_childhWnd does not get created and GetLastError() returns 1407 = Cannot find window class.

Is this WM_CREATE handler relevant in any way to the XAML island hosting demo?

Thank you

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• ID: 896fef0f-20c1-4191-4f05-b330bc02e820
• Version Independent ID: c58a8006-f1f3-4345-d5fb-205b4c782320
• Content: Host a standard WinRT XAML control in a C++ desktop (Win32) app using XAML Islands - Windows apps
• Content Source: hub/apps/desktop/modernize/host-standard-control-with-xaml-islands-cpp.md
• Product: reunion
• Technology: apps
• GitHub Login: @Karl-Bridge-Microsoft
• Microsoft Alias: kbridge

[petr-larin]

It's quite clear that neither WM_CREATE nor WM_SIZE handlers have anything to do with XAML islands, so they should be removed from the code sample.

At the same time, the sample shows a "degenerate" example of the control, that is, a static text box. It would be good to see some dynamic UI control (a button or a slider) in action - especially how to retrieve and send messages to them from the Win32 environment?