C#•2y ago

✅ WPF - Detect if screen resolution is resized (ex. 125% or more)

I'm writing a tool in which I need to first set the screen resolution, I currently have a 1920 x 1080, but I noticed that if in Windows screen resolution I enable the automatic resizing to 125% (or more) the tool retrieve false values. Ex. for 125% the software think that my resolution is: 1536 x 864. Is there an easy way to detect if is this enabled, and maybe also detect the % value? I'd like to make something like that.

private void Button_Click(object sender, RoutedEventArgs e)
{
    bool isResizing = true;
    if (isResizing)
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth * 1.25).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight * 1.25).ToString());
    }
    else
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight).ToString());
    }
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    bool isResizing = true;
    if (isResizing)
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth * 1.25).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight * 1.25).ToString());
    }
    else
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight).ToString());
    }
}

Or better:

int resizingPercent = 25;

int resizingPercent = 25;

If it's possible it will be nice, if it's not possible or too hard to make I'll go to ask to the user those data.

3 Replies

sibber•2y ago

don't crosspost

MODiX•2y ago

Cyberrex#8052

https://learn.microsoft.com/en-us/windows/win32/hidpi/declaring-managed-apps-dpi-aware

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uselessxpOP•2y ago

too hard, I don't understand it, and it report C++ code. I solved using (from https://learn.microsoft.com/en-us/archive/blogs/jaimer/getting-system-dpi-in-wpf-app):

private void Button_Click(object sender, RoutedEventArgs e)
{
    Matrix m = PresentationSource.FromVisual(Application.Current.MainWindow).CompositionTarget.TransformToDevice;
    double dx = m.M11;
    double dy = m.M22;
    if ((dx > 1) || (dy > 1))
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth * dx).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight * dy).ToString());
    }
    else
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight).ToString());
    }
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    Matrix m = PresentationSource.FromVisual(Application.Current.MainWindow).CompositionTarget.TransformToDevice;
    double dx = m.M11;
    double dy = m.M22;
    if ((dx > 1) || (dy > 1))
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth * dx).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight * dy).ToString());
    }
    else
    {
        MessageBox.Show((SystemParameters.PrimaryScreenWidth).ToString());
        MessageBox.Show((SystemParameters.PrimaryScreenHeight).ToString());
    }
}

Thinking better on it I think I could directly remove the else, or even better, the whole if statement, since if DPI scaling is not enabled, the resolution will be multiplied * 1, and so the value will be right anyway.

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✅ WPF - Detect if screen resolution is resized (ex. 125% or more)