BeforeClose Event

[Yazeed]

Hi All,

There is no BeforeClose event in Powerpoint 2007 like Excel and word, I'm
using Microsoft.Office.Interop.Powerpoint V.12.

Is there a way to disable Application closing using .Net??

 

[Chirag]

One of the ways to know if the application is closing is to subclass the
application window to get its messages. But for that, you would have to be
running within the PowerPoint process. Look at
http://officeone.mvps.org/vba/subclass_powerpoint.html for more information
and a sample that handles Close event.

- Chirag

PowerShow - View multiple PowerPoint slide shows simultaneously
http://officeone.mvps.org/powershow/powershow.html

 

[Yazeed]

Thank you chirag for your reply, i thought there is another way to do it,
however i tried to do it but its not working, here is some explanation:

Application powerPointApplication =new Application();
PowerPointApplication.Visible =MsoTriState.msoTrue;
PowerPointWindow window = new PowerPointWindow();
window.AssignHandle(new IntPtr(PowerPointApplication.HWND));

Here is the code for PowerPointWindow:

public class PowerPointWindow : NativeWindow
{
private const int WM_CLOSE = 0x10;

protected override void WndProc(ref Message m)
{
if (m.Msg != WM_CLOSE)
base.WndProc(ref m);
}
}

Now, the problem in this code that WndProc is never called, i tried to use
another approach by importing SetWindowLong from User32.dll but i'm getting
an error when trying use it (retrun value is 0 and GetLastError returned
this):

"An attempt was made to reference a token that does not exist"

please let me know if you want the code for SetWindowLong.

i know the subclassing should be within the same process like an add-in, so
Is it possible to subclass the powerpoint from another application like the
approach im following??

Thanks again

 

[Chirag]

AssignHandle() works only for the windows owned by its process. You cannot
assign it a handle of a different process. To get messages posted to another
process, you would need to use windows hooks. Look for SetWindowsHookEx()
API on MSDN.

- Chirag

PowerShow - View multiple PowerPoint slide shows simultaneously
http://officeone.mvps.org/powershow/powershow.html