catching a specific exception

[cj]

When I run myMAPIMessage.S end(True) if the user cancels the resulting
email it causes an exception. How do I trap this particular exception
and say that's ok?

try
myMAPIMessage.S end(True)
catch ex as ??????
'this is ok
catch ex as exception
'show these
messagebox.show (ex.message)
end try

Here is what the exception I'm getting is as shown in the command window:

? ex
{System.Runtime .InteropService s.COMException}
[System.Runtime. InteropServices .COMException]:
{System.Runtime .InteropService s.COMException}
HelpLink: "MAPI98.CHM#320 01"
InnerException: Nothing
Message: "User cancelled process"
Source: "MAPIMessag es"
StackTrace: " at MSMAPI.MAPIMess agesClass.Send( Object vDialog)
at WindowsApplicat ion20.Form1.Snd MAPIMail(String subj, String msg)
in C:\Documents and Settings\cj\My Documents\Visua l Studio
Projects\Window sApplication20\ Form1.vb:line 565"
TargetSite: {System.Reflect ion.RuntimeMeth odInfo}

[Kerry Moorman]

RE: catching a specific exception


cj,

Are all the exceptions COMExceptions?

If so, you might need to look at the exception's message to determine
whether to display an exception message. Something like:

Catch ex As Exception
If NOT ex.Message = "User cancelled process" Then
Msgbox ex.Message ...
End IF

In general I don't recommend looking at the exception's Message text to make
a decision, since the text might change in a future release, but you might
need to in this case.

Kerry Moorman

"cj" wrote:
[color=blue]
> When I run myMAPIMessage.S end(True) if the user cancels the resulting
> email it causes an exception. How do I trap this particular exception
> and say that's ok?
>
> try
> myMAPIMessage.S end(True)
> catch ex as ??????
> 'this is ok
> catch ex as exception
> 'show these
> messagebox.show (ex.message)
> end try
>
> Here is what the exception I'm getting is as shown in the command window:
>
> ? ex
> {System.Runtime .InteropService s.COMException}
> [System.Runtime. InteropServices .COMException]:
> {System.Runtime .InteropService s.COMException}
> HelpLink: "MAPI98.CHM#320 01"
> InnerException: Nothing
> Message: "User cancelled process"
> Source: "MAPIMessag es"
> StackTrace: " at MSMAPI.MAPIMess agesClass.Send( Object vDialog)
> at WindowsApplicat ion20.Form1.Snd MAPIMail(String subj, String msg)
> in C:\Documents and Settings\cj\My Documents\Visua l Studio
> Projects\Window sApplication20\ Form1.vb:line 565"
> TargetSite: {System.Reflect ion.RuntimeMeth odInfo}
>[/color]

[cj]

Re: catching a specific exception

I guess they would be. Now that I think of it in that light I guess if
I was using something specific to .net rather than mapi I might be able
to do it like I was thinking. Anyway, yea I can do it by looking at the
message. It'll be ok in this situation.

Kerry Moorman wrote:[color=blue]
> cj,
>
> Are all the exceptions COMExceptions?
>
> If so, you might need to look at the exception's message to determine
> whether to display an exception message. Something like:
>
> Catch ex As Exception
> If NOT ex.Message = "User cancelled process" Then
> Msgbox ex.Message ...
> End IF
>
> In general I don't recommend looking at the exception's Message text to make
> a decision, since the text might change in a future release, but you might
> need to in this case.
>
> Kerry Moorman
>
> "cj" wrote:
>[color=green]
>> When I run myMAPIMessage.S end(True) if the user cancels the resulting
>> email it causes an exception. How do I trap this particular exception
>> and say that's ok?
>>
>> try
>> myMAPIMessage.S end(True)
>> catch ex as ??????
>> 'this is ok
>> catch ex as exception
>> 'show these
>> messagebox.show (ex.message)
>> end try
>>
>> Here is what the exception I'm getting is as shown in the command window:
>>
>> ? ex
>> {System.Runtime .InteropService s.COMException}
>> [System.Runtime. InteropServices .COMException]:
>> {System.Runtime .InteropService s.COMException}
>> HelpLink: "MAPI98.CHM#320 01"
>> InnerException: Nothing
>> Message: "User cancelled process"
>> Source: "MAPIMessag es"
>> StackTrace: " at MSMAPI.MAPIMess agesClass.Send( Object vDialog)
>> at WindowsApplicat ion20.Form1.Snd MAPIMail(String subj, String msg)
>> in C:\Documents and Settings\cj\My Documents\Visua l Studio
>> Projects\Window sApplication20\ Form1.vb:line 565"
>> TargetSite: {System.Reflect ion.RuntimeMeth odInfo}
>>[/color][/color]

[Tom Shelton]

Re: catching a specific exception


Kerry Moorman wrote:[color=blue]
> cj,
>
> Are all the exceptions COMExceptions?
>
> If so, you might need to look at the exception's message to determine
> whether to display an exception message. Something like:
>
> Catch ex As Exception
> If NOT ex.Message = "User cancelled process" Then
> Msgbox ex.Message ...
> End IF
>
> In general I don't recommend looking at the exception's Message text to make
> a decision, since the text might change in a future release, but you might
> need to in this case.
>
> Kerry Moorman[/color]


With a COMException, you can always look at the ErrorCode property. It
will return the HRESULT of the error. You have to look up the specific
HRESULTS, but it is a little better then using the Message property,
IMHO.

--
Tom Shelton [MVP]

[cj]

Re: catching a specific exception

I'll look into it. Thanks!

Tom Shelton wrote:[color=blue]
> Kerry Moorman wrote:[color=green]
>> cj,
>>
>> Are all the exceptions COMExceptions?
>>
>> If so, you might need to look at the exception's message to determine
>> whether to display an exception message. Something like:
>>
>> Catch ex As Exception
>> If NOT ex.Message = "User cancelled process" Then
>> Msgbox ex.Message ...
>> End IF
>>
>> In general I don't recommend looking at the exception's Message text to make
>> a decision, since the text might change in a future release, but you might
>> need to in this case.
>>
>> Kerry Moorman[/color]
>
>
> With a COMException, you can always look at the ErrorCode property. It
> will return the HRESULT of the error. You have to look up the specific
> HRESULTS, but it is a little better then using the Message property,
> IMHO.
>
> --
> Tom Shelton [MVP]
>[/color]

[Jay B. Harlow [MVP - Outlook]]

Re: catching a specific exception

cj,
In addition to Tom's suggestion, you can use the When clause of the catch to
catch an exception based on specific attributes.

For example:

To only catch COM E_NOT_FOUND exceptions (in CDO) I use:

Try
Return GetField(name)
Catch ex As COMException When ex.ErrorCode =
MAPI.CdoErrorTy pe.CdoE_NOT_FOU ND
Return AddField(name, type)
End Try


Or to catch WebExceptions from HttpWebResponse s, I would use:

Try
m_response = DirectCast(m_re quest.GetRespon se(),
HttpWebResponse )
Catch ex As WebException When TypeOf ex.Response Is HttpWebResponse
m_response = DirectCast(ex.R esponse, HttpWebResponse )
End Try

--
Hope this helps
Jay B. Harlow [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net


"cj" <cj@nospam.nosp am> wrote in message
news:uiY$PX3eGH A.2188@TK2MSFTN GP04.phx.gbl...
| When I run myMAPIMessage.S end(True) if the user cancels the resulting
| email it causes an exception. How do I trap this particular exception
| and say that's ok?
|
| try
| myMAPIMessage.S end(True)
| catch ex as ??????
| 'this is ok
| catch ex as exception
| 'show these
| messagebox.show (ex.message)
| end try
|
| Here is what the exception I'm getting is as shown in the command window:
|
| ? ex
| {System.Runtime .InteropService s.COMException}
| [System.Runtime. InteropServices .COMException]:
| {System.Runtime .InteropService s.COMException}
| HelpLink: "MAPI98.CHM#320 01"
| InnerException: Nothing
| Message: "User cancelled process"
| Source: "MAPIMessag es"
| StackTrace: " at MSMAPI.MAPIMess agesClass.Send( Object vDialog)
| at WindowsApplicat ion20.Form1.Snd MAPIMail(String subj, String msg)
| in C:\Documents and Settings\cj\My Documents\Visua l Studio
| Projects\Window sApplication20\ Form1.vb:line 565"
| TargetSite: {System.Reflect ion.RuntimeMeth odInfo}