Multithreading

[Michael C]

Hello

Can someone please tell me what I'm doing wrong? I'm writing an application
that should be using callbacks to perform asynchronous calls to the Win32
API. Problem is it never reaches my callback function. Any feedback is
appreciated. Also, any references to websites with examples of .NET async
multithreading would be appreciated. Thanks in advance.

public serverInfo getSession(string servername)
{
serverInfo svInfo;
Object stateObj = new Object();
delGetServer x = new delGetServer(getServer);
IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
AsyncCallback(finishedProc), stateObj);
return (svInfo);
}

public static void getServer(string servername, out serverInfo svInfo)
{
// performs Win32 API calls to get server info. on network
}

public delegate void delGetServer (string s1, out serverInfo svInfo);

public static void finishedProc(IAsyncResult ar)
{
serverInfo svInfo;
delGetServer temp = (delGetServer)ar.AsyncState;
temp.EndInvoke(out svInfo, ar);
}

[AlexS]

Hi, Michael

Problem is that code is not complete. If you use asynch invoke like this one
[C#]
public IAsyncResult BeginInvoke(
object target,
object[] values,
AsyncCallback callback,
object asyncState
);then there are some differences in syntax. I would suggest to put tracers
in called methods to see process flow. Might happen your called delegate
really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net> wrote in
message news:hZ*********************@news4.srv.hcvlny.cv.n et...

Hello

Can someone please tell me what I'm doing wrong? I'm writing an application that should be using callbacks to perform asynchronous calls to the Win32
API. Problem is it never reaches my callback function. Any feedback is
appreciated. Also, any references to websites with examples of .NET async
multithreading would be appreciated. Thanks in advance.

public serverInfo getSession(string servername)
{
serverInfo svInfo;
Object stateObj = new Object();
delGetServer x = new delGetServer(getServer);
IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
AsyncCallback(finishedProc), stateObj);
return (svInfo);
}

public static void getServer(string servername, out serverInfo svInfo)
{
// performs Win32 API calls to get server info. on network
}

public delegate void delGetServer (string s1, out serverInfo svInfo);

public static void finishedProc(IAsyncResult ar)
{
serverInfo svInfo;
delGetServer temp = (delGetServer)ar.AsyncState;
temp.EndInvoke(out svInfo, ar);
}

[Michael C]

Thanks. I'm new to multithreading in .NET. I know the Async Callback
function is not being called. What's a tracer?

Michael C

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:Ok**************@TK2MSFTNGP09.phx.gbl...

Hi, Michael

Problem is that code is not complete. If you use asynch invoke like this one [C#]
public IAsyncResult BeginInvoke(
object target,
object[] values,
AsyncCallback callback,
object asyncState
);then there are some differences in syntax. I would suggest to put tracers in called methods to see process flow. Might happen your called delegate
really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net> wrote in message news:hZ*********************@news4.srv.hcvlny.cv.n et...

Hello

Can someone please tell me what I'm doing wrong? I'm writing an

application

that should be using callbacks to perform asynchronous calls to the Win32 API. Problem is it never reaches my callback function. Any feedback is
appreciated. Also, any references to websites with examples of .NET async multithreading would be appreciated. Thanks in advance.

public serverInfo getSession(string servername)
{
serverInfo svInfo;
Object stateObj = new Object();
delGetServer x = new delGetServer(getServer);
IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
AsyncCallback(finishedProc), stateObj);
return (svInfo);
}

public static void getServer(string servername, out serverInfo svInfo)
{
// performs Win32 API calls to get server info. on network
}

public delegate void delGetServer (string s1, out serverInfo svInfo);

public static void finishedProc(IAsyncResult ar)
{
serverInfo svInfo;
delGetServer temp = (delGetServer)ar.AsyncState;
temp.EndInvoke(out svInfo, ar);
}

[AlexS]

Michael,

tracer = Console.WriteLine or Debug/Trace calls.

delGetServer temp = (delGetServer)ar.AsyncState should be changed to
ar.AsyncDelegate. You try to get delegate from state, which doesn't work.
You can't see exception, because you don't have try/catch and execute on
another thread.

And I have slight suspicion that finishedProc is called once again by
EndInvoke. Check if EndInvokeCalled and IsCompleted too.

HTH
Alex

"Michael C" <mi*******@optonline.net> wrote in message
news:Ju*********************@news4.srv.hcvlny.cv.n et...

Thanks. I'm new to multithreading in .NET. I know the Async Callback
function is not being called. What's a tracer?

Michael C

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:Ok**************@TK2MSFTNGP09.phx.gbl...

Hi, Michael

Problem is that code is not complete. If you use asynch invoke like this

one

[C#]
public IAsyncResult BeginInvoke(
object target,
object[] values,
AsyncCallback callback,
object asyncState
);then there are some differences in syntax. I would suggest to put

tracers

in called methods to see process flow. Might happen your called delegate
really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net> wrote

in

message news:hZ*********************@news4.srv.hcvlny.cv.n et...

Hello

Can someone please tell me what I'm doing wrong? I'm writing an

application

that should be using callbacks to perform asynchronous calls to the Win32 API. Problem is it never reaches my callback function. Any feedback is appreciated. Also, any references to websites with examples of .NET async multithreading would be appreciated. Thanks in advance.

public serverInfo getSession(string servername)
{
serverInfo svInfo;
Object stateObj = new Object();
delGetServer x = new delGetServer(getServer);
IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
AsyncCallback(finishedProc), stateObj);
return (svInfo);
}

public static void getServer(string servername, out serverInfo svInfo)
{
// performs Win32 API calls to get server info. on network
}

public delegate void delGetServer (string s1, out serverInfo svInfo);

public static void finishedProc(IAsyncResult ar)
{
serverInfo svInfo;
delGetServer temp = (delGetServer)ar.AsyncState;
temp.EndInvoke(out svInfo, ar);
}

[Michael C]

Thanks for the help. I finally got it working. Only one problem - not all
of my threads are being killed after they do their job. After returning
their info., I'm consistently stuck with 5 or 6 threads that haven't been
killed. Any way to kill all worker threads at once?

Thanks,
Michael C.

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:eY**************@tk2msftngp13.phx.gbl...

Michael,

tracer = Console.WriteLine or Debug/Trace calls.

delGetServer temp = (delGetServer)ar.AsyncState should be changed to
ar.AsyncDelegate. You try to get delegate from state, which doesn't work.
You can't see exception, because you don't have try/catch and execute on
another thread.

And I have slight suspicion that finishedProc is called once again by
EndInvoke. Check if EndInvokeCalled and IsCompleted too.

HTH
Alex

"Michael C" <mi*******@optonline.net> wrote in message
news:Ju*********************@news4.srv.hcvlny.cv.n et...

Thanks. I'm new to multithreading in .NET. I know the Async Callback
function is not being called. What's a tracer?

Michael C

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:Ok**************@TK2MSFTNGP09.phx.gbl...

Hi, Michael

Problem is that code is not complete. If you use asynch invoke like this

one

[C#]
public IAsyncResult BeginInvoke(
object target,
object[] values,
AsyncCallback callback,
object asyncState
);then there are some differences in syntax. I would suggest to put tracers

in called methods to see process flow. Might happen your called

delegate really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net> wrote

in

message news:hZ*********************@news4.srv.hcvlny.cv.n et...
> Hello
>
> Can someone please tell me what I'm doing wrong? I'm writing an
application
> that should be using callbacks to perform asynchronous calls to the

Win32

> API. Problem is it never reaches my callback function. Any

feedback is > appreciated. Also, any references to websites with examples of .NET

async

> multithreading would be appreciated. Thanks in advance.
>
> public serverInfo getSession(string servername)
> {
> serverInfo svInfo;
> Object stateObj = new Object();
> delGetServer x = new delGetServer(getServer);
> IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
> AsyncCallback(finishedProc), stateObj);
> return (svInfo);
> }
>
> public static void getServer(string servername, out serverInfo

svInfo) > {
> // performs Win32 API calls to get server info. on network
> }
>
> public delegate void delGetServer (string s1, out serverInfo svInfo); >
> public static void finishedProc(IAsyncResult ar)
> {
> serverInfo svInfo;
> delGetServer temp = (delGetServer)ar.AsyncState;
> temp.EndInvoke(out svInfo, ar);
> }
>
>

[AlexS]

Michael,

what do you mean by killed?
"Michael C" <mi*******@optonline.net> wrote in message
news:IN*********************@news4.srv.hcvlny.cv.n et...

Thanks for the help. I finally got it working. Only one problem - not all of my threads are being killed after they do their job. After returning
their info., I'm consistently stuck with 5 or 6 threads that haven't been
killed. Any way to kill all worker threads at once?

Thanks,
Michael C.

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:eY**************@tk2msftngp13.phx.gbl...

Michael,

tracer = Console.WriteLine or Debug/Trace calls.

delGetServer temp = (delGetServer)ar.AsyncState should be changed to
ar.AsyncDelegate. You try to get delegate from state, which doesn't work.

You can't see exception, because you don't have try/catch and execute on
another thread.

And I have slight suspicion that finishedProc is called once again by
EndInvoke. Check if EndInvokeCalled and IsCompleted too.

HTH
Alex

"Michael C" <mi*******@optonline.net> wrote in message
news:Ju*********************@news4.srv.hcvlny.cv.n et...

Thanks. I'm new to multithreading in .NET. I know the Async Callback
function is not being called. What's a tracer?

Michael C

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:Ok**************@TK2MSFTNGP09.phx.gbl...
> Hi, Michael
>
> Problem is that code is not complete. If you use asynch invoke like

this one
> [C#]
> public IAsyncResult BeginInvoke(
> object target,
> object[] values,
> AsyncCallback callback,
> object asyncState
> );then there are some differences in syntax. I would suggest to put
tracers
> in called methods to see process flow. Might happen your called delegate > really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net> wrote in
> message news:hZ*********************@news4.srv.hcvlny.cv.n et...
> > Hello
> >
> > Can someone please tell me what I'm doing wrong? I'm writing an
> application
> > that should be using callbacks to perform asynchronous calls to the Win32
> > API. Problem is it never reaches my callback function. Any feedback

is

> > appreciated. Also, any references to websites with examples of ..NET async
> > multithreading would be appreciated. Thanks in advance.
> >
> > public serverInfo getSession(string servername)
> > {
> > serverInfo svInfo;
> > Object stateObj = new Object();
> > delGetServer x = new delGetServer(getServer);
> > IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
> > AsyncCallback(finishedProc), stateObj);
> > return (svInfo);
> > }
> >
> > public static void getServer(string servername, out serverInfo

svInfo) > > {
> > // performs Win32 API calls to get server info. on network
> > }
> >
> > public delegate void delGetServer (string s1, out serverInfo svInfo); > >
> > public static void finishedProc(IAsyncResult ar)
> > {
> > serverInfo svInfo;
> > delGetServer temp = (delGetServer)ar.AsyncState;
> > temp.EndInvoke(out svInfo, ar);
> > }
> >
> >
>
>

[Michael C]

I think I might have solved this one. I think I was recreating new
delegates when I was trying to kill the previous ones (i.e., stop them from
running). Sorry about the lingo - I forgot killing threads is what you do
on UN*X. I was just wondering if there was a way to force all the worker
threads to stop running at one shot, through a single instruction?

Thanks,
Michael C.

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...

Michael,

what do you mean by killed?
"Michael C" <mi*******@optonline.net> wrote in message
news:IN*********************@news4.srv.hcvlny.cv.n et...

Thanks for the help. I finally got it working. Only one problem - not

all

of my threads are being killed after they do their job. After returning
their info., I'm consistently stuck with 5 or 6 threads that haven't been

killed. Any way to kill all worker threads at once?

Thanks,
Michael C.

"AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
news:eY**************@tk2msftngp13.phx.gbl...

Michael,

tracer = Console.WriteLine or Debug/Trace calls.

delGetServer temp = (delGetServer)ar.AsyncState should be changed to
ar.AsyncDelegate. You try to get delegate from state, which doesn't work. You can't see exception, because you don't have try/catch and execute on another thread.

And I have slight suspicion that finishedProc is called once again by
EndInvoke. Check if EndInvokeCalled and IsCompleted too.

HTH
Alex

"Michael C" <mi*******@optonline.net> wrote in message
news:Ju*********************@news4.srv.hcvlny.cv.n et...
> Thanks. I'm new to multithreading in .NET. I know the Async Callback > function is not being called. What's a tracer?
>
> Michael C
>
> "AlexS" <sa***********@SPAMsympaticoPLEASE.ca> wrote in message
> news:Ok**************@TK2MSFTNGP09.phx.gbl...
> > Hi, Michael
> >
> > Problem is that code is not complete. If you use asynch invoke like this

> one
> > [C#]
> > public IAsyncResult BeginInvoke(
> > object target,
> > object[] values,
> > AsyncCallback callback,
> > object asyncState
> > );then there are some differences in syntax. I would suggest to

put > tracers
> > in called methods to see process flow. Might happen your called

delegate

> > really doesn't return.HTHAlex"Michael C" <mi*******@optonline.net>

wrote

> in
> > message news:hZ*********************@news4.srv.hcvlny.cv.n et...
> > > Hello
> > >
> > > Can someone please tell me what I'm doing wrong? I'm writing an
> > application
> > > that should be using callbacks to perform asynchronous calls to

the > Win32
> > > API. Problem is it never reaches my callback function. Any

feedback

is
> > > appreciated. Also, any references to websites with examples of .NET > async
> > > multithreading would be appreciated. Thanks in advance.
> > >
> > > public serverInfo getSession(string servername)
> > > {
> > > serverInfo svInfo;
> > > Object stateObj = new Object();
> > > delGetServer x = new delGetServer(getServer);
> > > IAsyncResult ar = x.BeginInvoke(servername, out svInfo, new
> > > AsyncCallback(finishedProc), stateObj);
> > > return (svInfo);
> > > }
> > >
> > > public static void getServer(string servername, out serverInfo

svInfo)

> > > {
> > > // performs Win32 API calls to get server info. on network
> > > }
> > >
> > > public delegate void delGetServer (string s1, out serverInfo

svInfo);

> > >
> > > public static void finishedProc(IAsyncResult ar)
> > > {
> > > serverInfo svInfo;
> > > delGetServer temp = (delGetServer)ar.AsyncState;
> > > temp.EndInvoke(out svInfo, ar);
> > > }
> > >
> > >
> >
> >
>
>