Throwing Errors (in ATL)

[MattWoberts]

Hi all,

Does anyone know how to throw a _com_error in ATL? I want to throw an error and set the description of the error somehow. Do I need to create a HRESULT or something?

Helllppppp!!

 

[jtm111]

When you create a new ATL object, you should go to the Attributes tab and check Support ISupportErrorInfo.

Then you can add rich error support using the following construct...


if(condition)
{
}

else
{
// this will generate a com exception
return Error(L"Long description of the exception",
IID_yourobject, E_FAIL);
}

 

[MattWoberts]

Thanks, I think I have cracked it! I was trying to throw _com_error's and getting very confused, raising a simple Error is working well!