USE_VCCOM
Use the USE_VCCOM macro in your Sources file to indicate that you are using the Microsoft Visual C++ COM libraries (Comsupp.lib, Comsuppd.lib). The Comsupp.lib library includes the _com_issue_error and _com_issue_errorex functions.
The following instruction will establish the correct build environment for a program that uses COM:
USE_VCCOM=1
See Also
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Build date: 5/3/2011