No idea how to use popt library

Question

All:

Thanks for help.

I am new to C option parsing, for now, what I want is to use popt library to parsing the each argument and prnit them out.

    #include <iostream>

    #include <string>

    #include <cstring>

    #include <popt.h>



    using namespace std;



    int main(int argc, const char* argv[]){



        char* dt1;

        char* dt2;



        struct poptOption {

               const char * longName; /* may be NULL */

               char shortName;        /* may be ’\0’ */

               int argInfo;

               void * arg;            /* depends on argInfo */

               int val;               /* 0 means don’t return, just update flag */

               char * descrip;        /* description for autohelp -- may be NULL */

               char * argDescrip;     /* argument description for autohelp */

            };

        struct poptOption optionsTable[]={

            {"start",'s',POPT_ARG_STRING,dt1,'s',"The date format should like YYYY-MM-DD.",0},

            {"end",'e',POPT_ARG_STRING,dt2,'e',"The date format should like YYYY-MM-DD.",0},

            //~ POPT_AUTOHELP

            //~ {NULL,0,0,NULL,0}

            };



        poptContext optCon;

        optCon = poptGetContext (0, argc, argv, optionsTable, 0);



            const char* portname = poptGetArg(optCon);

        cout<<portname<<endl;

        return 0;

}

When I compile it, I got error llike:

test.cpp: In function ‘int main(int, const char**)’

test.cpp:27: warning: deprecated conversion from string constant to ‘char*’

test.cpp:27: warning: deprecated conversion from string constant to ‘char*’

test.cpp:30: error: cannot convert ‘main(int, const char**)::poptOption*’ to ‘const poptOption*’ for argument ‘4’ to ‘poptContext_s* poptGetContext(const char*, int, const char**, const poptOption*, unsigned int)’

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Answer 1

I don't think you should be defining the struct poptOption in your program. That struct should be defined for you in the popt include file. Try removing that struct definition.

Note, I think you also need to uncomment this line:

    //~ {NULL,0,0,NULL,0}

No idea how to use popt library

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