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Get and Set Units Example (C++ COM)

This example shows how to get the current unit settings of the document and change them to inches. Be sure to import swconst.tlb.

The method IModelDoc2::IGetUnits returns an array, so this code must be used in an in-process DLL. Otherwise, use the method IModelDoc2::GetUnits that returns a VARIANT.


GetAndSetUnits(ISldWorks* m_pSldWorks)



 // Retrieve Model Document pointer

 if( S_OK != m_pSldWorks->get_IActiveDoc2( &pModelDoc ) || pModelDoc == NULL )


 short unitArray[5];

 HRESULT hres = S_OK;

 hres = pModelDoc->IGetUnits(unitArray);

 CString message;    // Create message string

 message.Format(_T("Unit Settings are:\n%d \t%d \t%d \t%d \t%d"),


 // Send message to the user

 AfxMessageBox (message);   

 // If units are not inches, change them to inches

 if (unitArray[0] != swINCHES)


  short denom = 16;

  hres = pModelDoc->SetUnits(swINCHES, swFRACTION, denom, unitArray[3], FALSE);




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