Hi Jason,
Based on my understanding, you want to show some customized error from your
.net Windows Service application. Since you are referring to ExitCode
property, I am assuming you are using VS2005. Thanks.
First, I am not sure where do you want to show the customized erorr. In
Windows Service architecture, there are 2 processes: service process and
SCP process(which proivdes UI to the user and communicates with the service
process through any IPC technologies). Defaultly, Windows provided a
general style of SCP application services.msc as a MMC, so we normally use
this services.msc to manipulate the service applications. So my question is
do you want to show the customized error in standard services.msc or your
own written SCP application? To write a customized SCP application, we may
leverage ServiceControll er .Net class, please see the article below for
details:
"Communicat e With Windows Services"
http://msdn.microsoft.com/library/en...asp?frame=true
In my test project, I created a sample Windows Service application, with
the following simple code:
protected override void OnStop()
{
this.ExitCode = 100;
}
In services.msc, I clicked this deployed service and choose "Stop" command
to trigger the test code. The services.msc will report a dialog with the
error below:
"Error 100: Cannot create another system semaphore.". Is this what you
want? Note: the "Cannot create another system semaphore" string is the
win32 predefined error message for error code 100. So your application can
report any predefined win32 standard error through ExitCode property.
If you want to report something that is not specific to win32 predefined
error code, you should report it through
SERVICE_STATUS. dwServiceSpecif icExitCode field.(Note: SERVICE_STATUS is a
win32 SDK C++ structure which is encapsulated in .Net service classes, you
can look it in MSDN for more information). However, there is one problem
of using SERVICE_STATUS. dwServiceSpecif icExitCode field to report
customized failure:
"SERVICE_ST ATUS structure is encapsulated in .Net BCL, however, it is
marked as private and .Net did not provide any public property to
expose.(althoug h .Net provide ExitCode property to expose
SERVICE_STATUS. dwWin32ExitCode field), so it is impossible for us to use
this field in .Net code."
For testing purpose, I use VS2005 to debug my test Windows Service process,
and set a breakpoint in OnStop() method. When the execution breaks in
OnStop() method, I use the "Watch Window" to view "this.statu s" field,
which contains .Net encapsulated SERVICE_STATUS structure. In this window,
I modified dwWin32ExitCode to 1066L(ERROR_SER VICE_SPECIFIC_E RROR) and
dwServiceSpecif icExitCode to 100.(Yes, debugger can ignore the .Net
protection and change the memory directly)
I really will get the following dialog in services.msc:
"Windows could not stop the WindowsServiceE rrorReport on local computer.
For more information, review the System Event log. If it is a non-Microsoft
serivce, contact the service vendor, and refer to service-specific error
code 100"
I also got an error message in eventlog below:
"The WindowsServiceE rrorReport service terminated with service-specific
error 100 (0x64)."
So SERVICE_STATUS. dwServiceSpecif icExitCode really meets our need, however
it is not exposed by current .Net FCL.
Hope this helps.
Best regards,
Jeffrey Tan
Microsoft Online Community Support
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