COM exceptions in C#?

[Petar Popara]

How can I catch COM exceptions (IErrorInfo) in C#? What should be inside
catch()?

An example:

try
{
....
}
catch(What goes here?)
{
....
}

 

[Ollie Riches]

check out the COMException on the MSDN website:

http://msdn.microsoft.com/library/d...timeInteropServicesCOMExceptionClassTopic.asp


but a simple example:

try
{
...
...
}
catch(System.Runtime.InteropServices.COMException exn)
{

}


HTH

Ollie Riches

 

[Petar Popara]

check out the COMException on the MSDN website

Thank you. I've tried that and it catches the exception.

The only problem is that I got "Unspecified error" (e.Message()) insead of
error description I have set in my (VC++ 6) COM object. Why?

 

[Ollie Riches]

is there an inner exception at all?

Ollie Riches

 

[Petar Popara]

What is "inner exception"?

 

[Ollie Riches]

check out:

http://msdn.microsoft.com/library/d...rfsystemexceptionclassinnerexceptiontopic.asp

 

[Petar Popara]

check out:

http://msdn.microsoft.com/library/d...rfsystemexceptionclassinnerexceptiontopic.asp

Thank you.

is there an inner exception at all?

No, there isn't.

This is my code:

try
{
myCOM.callSomeMethod();
}
catch (System.Runtime.InteropServices.COMException e)
{
Console.WriteLine("Exception: {0}", e.Message);
Console.WriteLine("Exception code: {0}", e.ErrorCode);
Console.WriteLine("Exception description: {0}", e.InnerException.Message);
}

 

[Ollie Riches]

what should the error message contain? is 'Unspecified error' not the
expected message?

Ollie Riches

 

[Petar Popara]

what should the error message contain? is 'Unspecified error' not the
expected message?

No, it was not expected message. I have set descriptive message text.

 

[Ollie Riches]

Are you receiving the expected HRESULT?

Ollie Riches

 

[Petar Popara]

Are you receiving the expected HRESULT?

Yes. It is 0x80004005. Common text for this error code is "Unspecified
error", but I also specify my descriptive error message which C# (.Net)
ignores and prints common message.

I could show you the same exception handling code (that works fine) in C++
(not managed) if it would help.

 

[Petar Popara]

This is JScript code that works fine:

try
{
myCOM.someMethod();
}
catch (e)
{
msg = "Exception: " + e.description;
msg += "\r\nException code: " + e.number;
}