troubleshooting Question

How can I get the error information from a COM H

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   I use a function of one COM Control at VB. when this function failed, I get get the error information by "ERR.Description". Later I use it in VC. To my surprise, when this function failed, Instead of throwing _com_error exception, it return a below-zero value of HRESULT type. But How can I get the error information just like "ERR.Description" at VB?

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