Windows shutdown hanging - Getting desperate!

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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!
 
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.
 
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...
 
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...
 
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...
 
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