HRESULTs and VARIANT_BOOL return values from IXMLDOMDocument methods

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I have been using the following methods:

IXMLDOMDocument.CreateInstance

IXMLDOMDocument.load

I have had a lot of bother checking the return values for failure. CreateInstance seems to return an HRESULT and load seems to return a VARIANT_BOOL.

Is there any coherency between these retrun types or any logic o why an HRESULT or VARIANT_BOOL is the return type in each case? I still don't understand what HRESULTS are and when they are used - there seems to be very little on the subject. Can anyone point me at anything please?

Many thanks

Posted 29-Sep-11 23:08pm

Jackie Lloyd

Updated 29-Sep-11 23:19pm

Slacker007

v2

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Slacker007 30-Sep-11 5:19am

Edit: Formatting and readability.

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KingsGambit · Accepted Answer · 2011-09-30T01:51:00

Solution 1

HRESULT provides detailed status of the operation (e.g. Interface not supported). But VARIANT_BOOL just tells true or false.

http://msdn.microsoft.com/en-us/library/bb401631.aspx[^]

Posted 30-Sep-11 1:51am

KingsGambit

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Jackie Lloyd 30-Sep-11 8:00am

Thanks - that's really useful.