Is it possible to cascade the ppt slide show window and my application using C# code.

Question

I have created an application that looks like a news ticker. It suppose to run on a machine which has PPT slide show running on it always. I have set this.TopMost = true

So the ticker application overlaps the PPT. But I want that the ticker application as well as the ppt are seen together. This is possible only if I can cascade the applications.

Can someone please help?

Answer 1

Don't use TopMost = true, instead set window boundary for both applications. The trick is only how to set windows rectangle for PPT application.

using System;
using System.Runtime.InteropServices;
using System.Diagnostics;

[StructLayout(LayoutKind.Sequential)]
struct RECT
{
    public int left;
    public int top;
    public int right;
    public int bottom;
}

class WindowHelper
{
    [DllImport("user32.dll")]
    static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth,
    int nHeight, bool bRepaint);

    static void SetWindowRect()
    {
        Process p = new Process();
        p.StartInfo.FileName = "PPT.exe";
        p.Start();
        p.WaitForInputIdle();
        IntPtr hWnd = p.MainWindowHandle;
        int width = 300;
        int height = 600;
        // you can use Screen.PrimaryScreen.WorkingArea to set proper size
        MoveWindow(hWnd, 0, 0, width, height, true);
    }
}