Error in COM

[Lost User]

Hello everyone, I am new at COM. I want to implement a COM object that throws _com_error objects as error. How can I implement such a functionality in my COM object. Busy Bee

[Henrik Sternberg]

Hi Busy, Sorry, but the COM standard only allow COM-errors, if you want it to throw a generic error, you can write a wrapper for your COM-module, that catch a com error and then throw an error. /_henrik Henrik Sternberg, Cambridge Technolgy Partners Central Europe www.ctp.com/ce

[Carlos Antollini]

Are you working with ATL? Cheers Carlos Antollini.

[Michael P Butler]

Look at IErrorInfo in combination with HRESULT. There is plenty of info in MSDN. Michael :-)

[Rashid Thadha]

if you are using ATL then you can use the method Error to throw the exception, this will be caught in a _com_error catch e.g. instead of returning S_OK; do the following return Error(_bstr_t(ErrorDescription).copy(), IID_IObj);

[Lost User]

Thank you every one. I have figured all that out. The actual class should have an implementation of ISupportErrorInfo. Thanks everyone again.