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.

ComP12
......\ComP12.dsw
......\Simple9
......\.......\dlldata.c
......\.......\Resource.h
......\.......\Simple9.aps
......\.......\Simple9.cpp
......\.......\Simple9.def
......\.......\Simple9.dsp
......\.......\Simple9.h
......\.......\Simple9.idl
......\.......\Simple9.plg
......\.......\Simple9.rc
......\.......\Simple9.tlb
......\.......\Simple9ps.def
......\.......\Simple9ps.mk
......\.......\Simple9_i.c
......\.......\Simple9_p.c
......\.......\SimpleErr.cpp
......\.......\SimpleErr.h
......\.......\SimpleErr.rgs
......\.......\StdAfx.cpp
......\.......\StdAfx.h
......\Use
......\...\Debug
......\...\ReadMe.txt
......\...\res

......\...\...\Use.rc2
......\...\Resource.h
......\...\Simple9.tlh
......\...\Simple9.tli
......\...\StdAfx.cpp
......\...\StdAfx.h
......\...\Use.aps
......\...\Use.clw
......\...\Use.cpp
......\...\Use.dsp
......\...\Use.h
......\...\Use.plg
......\...\Use.rc
......\...\UseDlg.cpp
......\...\UseDlg.h
..........\Simple10
..........\........\dlldata.c
..........\........\ReadMe.txt
..........\........\Resource.h
..........\........\Simple10.aps
..........\........\Simple10.cpp
..........\........\Simple10.def
..........\........\Simple10.h
..........\........\Simple10.idl
..........\........\Simple10.rc
..........\........\Simple10.rgs
..........\........\Simple10.vcproj
..........\........\Simple10.vcproj.vspscc
..........\........\Simple10ps.def
..........\........\Simple10PS.vcproj
..........\........\Simple10PS.vcproj.vspscc
..........\........\Simple10_i.c
..........\........\Simple10_p.c
..........\........\SimpleErr.cpp
..........\........\SimpleErr.h
..........\........\SimpleErr.rgs
..........\........\stdafx.cpp
..........\........\stdafx.h
..........\Use
..........\...\ReadMe.txt
..........\...\res

..........\...\...\Use.rc2
..........\...\Resource.h
..........\...\stdafx.cpp
..........\...\stdafx.h
..........\...\Use.aps
..........\...\Use.cpp
..........\...\Use.h
..........\...\Use.rc
..........\...\Use.vcproj
..........\...\UseDlg.cpp
..........\...\UseDlg.h

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