C language to obtain the desired key from excel

TestExcel
.........\Book1.xls
.........\Debug
.........\excel.cpp
.........\excel.h
.........\input.xls
.........\MessageBox_private.cpp
.........\MessageBox_private.h
.........\ReadMe.txt
.........\res
.........\resource.h
.........\...\TestExcel.ico
.........\...\TestExcel.rc2
.........\StdAfx.cpp
.........\StdAfx.h
.........\test.txt
.........\TestExcel.aps
.........\TestExcel.clw
.........\TestExcel.cpp
.........\TestExcel.dsp
.........\TestExcel.dsw
.........\TestExcel.h
.........\TestExcel.ncb
.........\TestExcel.opt
.........\TestExcel.plg
.........\TestExcel.rc
.........\TestExcelDlg.cpp
.........\TestExcelDlg.dsp
.........\TestExcelDlg.dsw
.........\TestExcelDlg.h
.........\TestExcelDlg.ncb
.........\TestExcelDlg.opt
.........\TestExcelDlg.plg

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