Problem with create two windows in winui 3

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Hello,

In a project in C++ WinUI 3, I have a problem to create two windows at the same time. I reduce the problem to narrow down and I realize that I can't create two objects Window in the same function. For example, if I have an event when a button is clicked like this:

void MainWindow::ClickButton(IInspectable const&, RoutedEventArgs const&)
{
w1 = Window();
w2 = Window();
}

Obviously I'm simplified the code for clarity. w1 and w2 are variables of type IWindow members of class MainWindow.

The avove code fails with an unmanaged exception. The function run perfectly and return, but the exception is triggered.

If I create only one Window it work right. How to create two windows inside an event handler?

Thanks in advance!

What I have tried:

I tried activate both windows but no luk

Posted 25-Jan-24 8:16am

Vicente Flich

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Gerry Schmitz · Answer 1 · 2024-01-25T18:47:00

Solution 1

You need a "multi-instance" application if you want more than one window in UWP.

Create a multi-instance Universal Windows App - UWP applications | Microsoft Learn[^]

Posted 25-Jan-24 18:47pm

Gerry Schmitz

Comments

Vicente Flich 26-Jan-24 2:40am

But, I don't understand this is the problem, simply I want two windows in the same instance. If I code the same but in two events separately:

void MainWindow::ClickButton1(IInspectable const&, RoutedEventArgs const&)
{
w1 = Window();
}
void MainWindow::ClickButton2(IInspectable const&, RoutedEventArgs const&)
{
w2 = Window();
}

They work and create two windows without error. Why cannot do it in the same event handler?