Explaining how to retrive the caller number from the incoming call in symbian c++

RetrieveNumber
..............\helloworldbasic
..............\...............\aif
..............\...............\...\helloworldbasicaif.rss

..............\...............\...\qgn_menu_demo_cxt_mask.bmp

..............\...............\...\qgn_menu_demo_lst_mask.bmp
..............\...............\data
..............\...............\....\helloworldbasic.loc
..............\...............\....\helloworldbasic.rss
..............\...............\....\helloworldbasic_caption.rss
..............\...............\group
..............\...............\.....\bld.inf
..............\...............\.....\helloworldbasic.mmp
..............\...............\inc
..............\...............\...\helloworldbasic.hrh
..............\...............\...\helloworldbasic.pan
..............\...............\...\helloworldbasicapplication.h
..............\...............\...\helloworldbasicappui.h
..............\...............\...\helloworldbasicappview.h
..............\...............\...\helloworldbasicdocument.h
..............\...............\...\RetrieveNumber.h
..............\...............\sis
..............\...............\...\helloworldbasic.pkg
..............\...............\...\helloworldbasic.SIS
..............\...............\src
..............\...............\...\helloworldbasic.cpp
..............\...............\...\helloworldbasicapplication.cpp
..............\...............\...\helloworldbasicappui.cpp
..............\...............\...\helloworldbasicappview.cpp
..............\...............\...\helloworldbasicdocument.cpp
..............\...............\...\RetrieveNumber.cpp

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