Prevent child process from creating visible windows?

Question

I\'m trying to use Office Automation (PIA) to convert some .pptx documents into some other formats. However, PowerPoint insists on showing a progress bar even t

Answer 1

You can try to leave Application.Visible property with it's default value and pass MsoTriState.msoFalse to WithWindow paremeter when you open a presentation:

var application = new Application();
var document = application.Presentations.Open(fileName, MsoTriState.msoFalse, MsoTriState.msoFalse, 
    WithWindow: MsoTriState.msoFalse);

If you explicitly set Application.Visible property to MsoTriState.msoFalse you will get "Hiding the application window is not allowed" error.