Windows shutdown hanging - Getting desperate!

G

Guest

I have an application running in the background, visible only by a notify
icon in the system tray. I learned from other posts to catch the
WM_QUERYENDSESSION and WM_ENDSESSION messages. Now, when I want to
shutdown/restart the computer the application exits but the shutdown process
does not continue anymore. Here's what I've done:

protected override void WndProc(ref Message m)
{
// Exit message code.
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
if (m.Msg == WM_QUERYENDSESSION || m.Msg == WM_ENDSESSION)
{
base.WndProc(ref m);
this.Close();
}
else
{
base.WndProc(ref m);
}
}

The MainForm is started in normal state and is set to invisible after start.
PLEASE HELP ME!
 
N

Nicholas Paldino [.NET/C# MVP]

David,

You need to set the return value when the message is WM_QUERYENDSESSION.
Basically, your code should look like this:

// Process the message normally.
base.WndProc(ref m);

// If the result is to query to end the session, set the return value to 1.
if (m.Msg == WM_QUERYENDSESSION)
{
// Return true for the result.
m.Result = 1;
}
else if (m.Msg == WM_ENDSESSION)
{
// Close the form.
this.Close();
}

Hope this helps.
 
G

Guest

Hi Nicholas,

thanx a lot for your reply. This is an annoying little big problem! I
reworked the WndProc Method to this:

protected override void WndProc(ref Message m)
{
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
// Carry on with the message.
base.WndProc(ref m);
if (m.Msg == WM_QUERYENDSESSION)
{
m.Result = (IntPtr) 1;
}
else if (m.Msg == WM_ENDSESSION)
{
this.Close();
}
}

However, it does not change anything. The application closes but shutdown
aborts as well. I noticed that the WM_QUERYENDSESSION message never triggers,
only the WM_ENDSESSION does. I am closing the applications log file (not
shown in the code above) before issuing "this.Close()" and therefore I see
what triggers the applications exit. I guess this does not make a difference,
does it?

Dave.

Nicholas Paldino said:
David,

You need to set the return value when the message is WM_QUERYENDSESSION.
Basically, your code should look like this:

// Process the message normally.
base.WndProc(ref m);

// If the result is to query to end the session, set the return value to 1.
if (m.Msg == WM_QUERYENDSESSION)
{
// Return true for the result.
m.Result = 1;
}
else if (m.Msg == WM_ENDSESSION)
{
// Close the form.
this.Close();
}

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)


David Meier said:
I have an application running in the background, visible only by a notify
icon in the system tray. I learned from other posts to catch the
WM_QUERYENDSESSION and WM_ENDSESSION messages. Now, when I want to
shutdown/restart the computer the application exits but the shutdown
process
does not continue anymore. Here's what I've done:

protected override void WndProc(ref Message m)
{
// Exit message code.
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
if (m.Msg == WM_QUERYENDSESSION || m.Msg == WM_ENDSESSION)
{
base.WndProc(ref m);
this.Close();
}
else
{
base.WndProc(ref m);
}
}

The MainForm is started in normal state and is set to invisible after
start.
PLEASE HELP ME!
Click to expand...
Click to expand...
 
N

Nicholas Paldino [.NET/C# MVP]

David,

The only other thing that you should be sure to do is set the Result
property of the message to 0 when the message is WM_ENDSESSION. This
indicates that it is ok to shut down.

It ^might^ be an issue that you have the log file open. Does calling
close on the application actually close the app? Can you use
Application.Exit instead to shut down?


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

David Meier said:
Hi Nicholas,

thanx a lot for your reply. This is an annoying little big problem! I
reworked the WndProc Method to this:

protected override void WndProc(ref Message m)
{
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
// Carry on with the message.
base.WndProc(ref m);
if (m.Msg == WM_QUERYENDSESSION)
{
m.Result = (IntPtr) 1;
}
else if (m.Msg == WM_ENDSESSION)
{
this.Close();
}
}

However, it does not change anything. The application closes but shutdown
aborts as well. I noticed that the WM_QUERYENDSESSION message never
triggers,
only the WM_ENDSESSION does. I am closing the applications log file (not
shown in the code above) before issuing "this.Close()" and therefore I see
what triggers the applications exit. I guess this does not make a
difference,
does it?

Dave.

Nicholas Paldino said:
David,

You need to set the return value when the message is
WM_QUERYENDSESSION.
Basically, your code should look like this:

// Process the message normally.
base.WndProc(ref m);

// If the result is to query to end the session, set the return value to
1.
if (m.Msg == WM_QUERYENDSESSION)
{
// Return true for the result.
m.Result = 1;
}
else if (m.Msg == WM_ENDSESSION)
{
// Close the form.
this.Close();
}

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)


David Meier said:
I have an application running in the background, visible only by a
notify
icon in the system tray. I learned from other posts to catch the
WM_QUERYENDSESSION and WM_ENDSESSION messages. Now, when I want to
shutdown/restart the computer the application exits but the shutdown
process
does not continue anymore. Here's what I've done:

protected override void WndProc(ref Message m)
{
// Exit message code.
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
if (m.Msg == WM_QUERYENDSESSION || m.Msg == WM_ENDSESSION)
{
base.WndProc(ref m);
this.Close();
}
else
{
base.WndProc(ref m);
}
}

The MainForm is started in normal state and is set to invisible after
start.
PLEASE HELP ME!
Click to expand...
Click to expand...
Click to expand...
 
G

Guest

Hi Niclas, you are a mastermind! It seems to work now when putting the
0-return value in the code. I just wonder why other people got it to work
without both of the return values... Thanks a LOT! Dave.

Nicholas Paldino said:
David,

The only other thing that you should be sure to do is set the Result
property of the message to 0 when the message is WM_ENDSESSION. This
indicates that it is ok to shut down.

It ^might^ be an issue that you have the log file open. Does calling
close on the application actually close the app? Can you use
Application.Exit instead to shut down?


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

David Meier said:
Hi Nicholas,

thanx a lot for your reply. This is an annoying little big problem! I
reworked the WndProc Method to this:

protected override void WndProc(ref Message m)
{
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
// Carry on with the message.
base.WndProc(ref m);
if (m.Msg == WM_QUERYENDSESSION)
{
m.Result = (IntPtr) 1;
}
else if (m.Msg == WM_ENDSESSION)
{
this.Close();
}
}

However, it does not change anything. The application closes but shutdown
aborts as well. I noticed that the WM_QUERYENDSESSION message never
triggers,
only the WM_ENDSESSION does. I am closing the applications log file (not
shown in the code above) before issuing "this.Close()" and therefore I see
what triggers the applications exit. I guess this does not make a
difference,
does it?

Dave.

Nicholas Paldino said:
David,

You need to set the return value when the message is
WM_QUERYENDSESSION.
Basically, your code should look like this:

// Process the message normally.
base.WndProc(ref m);

// If the result is to query to end the session, set the return value to
1.
if (m.Msg == WM_QUERYENDSESSION)
{
// Return true for the result.
m.Result = 1;
}
else if (m.Msg == WM_ENDSESSION)
{
// Close the form.
this.Close();
}

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)


I have an application running in the background, visible only by a
notify
icon in the system tray. I learned from other posts to catch the
WM_QUERYENDSESSION and WM_ENDSESSION messages. Now, when I want to
shutdown/restart the computer the application exits but the shutdown
process
does not continue anymore. Here's what I've done:

protected override void WndProc(ref Message m)
{
// Exit message code.
int WM_QUERYENDSESSION = 0x11;
int WM_ENDSESSION = 0x16;
if (m.Msg == WM_QUERYENDSESSION || m.Msg == WM_ENDSESSION)
{
base.WndProc(ref m);
this.Close();
}
else
{
base.WndProc(ref m);
}
}

The MainForm is started in normal state and is set to invisible after
start.
PLEASE HELP ME!
Click to expand...
Click to expand...
Click to expand...
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

Blocking windows shutdown from a form on a different thread 5
Delay Windows Restart/Shutdown 2
Problems Shutting down a Sys Tray app 1
system shut down problem with webbrowser 1
Waiting for a web page to load on shutdown 1
How to catch WM_NCMOUSEMOVE in MDI Form? 3
PostMessage 3
Restricting textbox input 1

Top