Program design, error handling is essential, and it is often needed to take up very little space. The book landed back in the COM errors (unusual) approach. In the component program, if they are wrong, generally have two ways to deal with.

Packet : 41695078comtut12src.rar filelist
ComP12
ComP12\Simple9
ComP12\Simple9\StdAfx.cpp
ComP12\Simple9\StdAfx.h
ComP12\Simple9\Simple9.def
ComP12\Simple9\Simple9ps.def
ComP12\Simple9\Simple9ps.mk
ComP12\Simple9\Simple9.cpp
ComP12\Simple9\SimpleErr.rgs
ComP12\Simple9\Resource.h
ComP12\Simple9\Simple9.aps
ComP12\Simple9\Simple9.rc
ComP12\Simple9\SimpleErr.h
ComP12\Simple9\Simple9.idl
ComP12\Simple9\Simple9.plg
ComP12\Simple9\Simple9_p.c
ComP12\Simple9\dlldata.c
ComP12\Simple9\SimpleErr.cpp
ComP12\Simple9\Simple9.tlb
ComP12\Simple9\Simple9_i.c
ComP12\Simple9\Simple9.h
ComP12\Simple9\Simple9.dsp
ComP12\Use
ComP12\Use\Use.clw
ComP12\Use\ReadMe.txt
ComP12\Use\Use.h
ComP12\Use\StdAfx.cpp
ComP12\Use\res
ComP12\Use\res\Use.rc2
ComP12\Use\res\Use.ico
ComP12\Use\Use.dsp
ComP12\Use\UseDlg.h
ComP12\Use\Simple9.tlh
ComP12\Use\Simple9.tli
ComP12\Use\StdAfx.h
ComP12\Use\Use.cpp
ComP12\Use\Resource.h
ComP12\Use\Use.plg
ComP12\Use\Use.aps
ComP12\Use\Use.rc
ComP12\Use\UseDlg.cpp
ComP12\Use\Debug
ComP12\ComP12.dsw
ComP12.net
ComP12.net\ComP12.net.sln
ComP12.net\Simple10
ComP12.net\Simple10\Simple10.vcproj
ComP12.net\Simple10\stdafx.cpp
ComP12.net\Simple10\stdafx.h
ComP12.net\Simple10\Simple10.cpp
ComP12.net\Simple10\ReadMe.txt
ComP12.net\Simple10\Simple10.rgs
ComP12.net\Simple10\Simple10.idl
ComP12.net\Simple10\Simple10.def
ComP12.net\Simple10\Simple10.h
ComP12.net\Simple10\Simple10_i.c
ComP12.net\Simple10\Simple10PS.vcproj
ComP12.net\Simple10\Simple10ps.def
ComP12.net\Simple10\SimpleErr.rgs
ComP12.net\Simple10\Resource.h
ComP12.net\Simple10\Simple10.aps
ComP12.net\Simple10\Simple10.rc
ComP12.net\Simple10\SimpleErr.h
ComP12.net\Simple10\SimpleErr.cpp
ComP12.net\Simple10\Simple10_p.c
ComP12.net\Simple10\dlldata.c
ComP12.net\Simple10\Simple10.vcproj.vspscc
ComP12.net\Simple10\Simple10PS.vcproj.vspscc
ComP12.net\Use
ComP12.net\Use\Use.vcproj
ComP12.net\Use\ReadMe.txt
ComP12.net\Use\Use.h
ComP12.net\Use\Use.cpp
ComP12.net\Use\UseDlg.h
ComP12.net\Use\UseDlg.cpp
ComP12.net\Use\stdafx.h
ComP12.net\Use\stdafx.cpp
ComP12.net\Use\res
ComP12.net\Use\res\Use.rc2
ComP12.net\Use\res\Use.ico
ComP12.net\Use\Resource.h
ComP12.net\Use\Use.aps
ComP12.net\Use\Use.rc

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