Using XML in C++ and getting class not registered error for MSXML 4.0

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I am using XML in my C++ application. I installed MSXML 4.0 on the Server 2008. The registry has the value for UUID 88d969c0-f192-11d4-a65f-0040963251e5.

In my code I am trying to create an instance of XML document and getting an error "Class not registered" for the same UUID above.

This worked in the past on a 32 bit Windows 2008 Server. Now I am using a 64 bit server and 64 bit compiler in Visual Studio 2010. I would appreciate any help. Thanks.

Posted 22-May-14 5:36am

Nick R 336

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Manikandan10 · Answer 1 · 2014-05-22T05:39:00

Solution 1

Visit the page:
http://social.msdn.microsoft.com/Forums/en-US/0dcdae4b-5c89-41f7-92e6-1b57bf78fc4e/installing-msxml-40-sp1-after-the-installation-of-40-sp2-causes-a-class-not-registered-issue?forum=xmlandnetfx[^]

Posted 22-May-14 5:39am

Manikandan10

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Nick R 336 12-Jun-14 8:36am

I installed MSXML 4.0 SP3. But that still didn't solve my problem. What seems to fix the problem is using a different DOMDocument:

// Initialize the DOM
m_hrLastResult =
m_pxIXMLDoc.CoCreateInstance(CLSID_FreeThreadedDOMDocument,NULL,CLSCTX_INPROC_SERVER);

The question I have is why CLSID_FreeThreadedDOMDocument works fine and CLSID CLSID_DOMDocument40 does not (gives me "class not registered error). Even though they are declared in msxml2.h right next to each other:

EXTERN_C const CLSID CLSID_DOMDocument40;

#ifdef __cplusplus

class DECLSPEC_UUID("88d969c0-f192-11d4-a65f-0040963251e5")
DOMDocument40;
#endif

EXTERN_C const CLSID CLSID_FreeThreadedDOMDocument;

#ifdef __cplusplus

class DECLSPEC_UUID("F6D90F12-9C73-11D3-B32E-00C04F990BB4")
FreeThreadedDOMDocument;
#endif