John F. Bergin               

Bellevue, WA

(425) 242-1394

John.F.Bergin@Comcast.net                            Resume

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Cover Letter                                                    White Papers                                            Code Examples

Senior Software Engineer                                                                                                                                                                                                          

Code Examples by John F. Bergin

    Command Line Arguments

    The following structure and program can be used to handle C++ command line arguments.  The command line arguments are parsed and

    stored in a data structure that can be used throughout the program.

    // Structure for Command Line Parsing

    typedef struct CmdLineOptions {

        int Method;

        int Hide;

        int Help;

    } CmdLineOptions;

      // Prototype  

        CmdLineOptions *ParseCommandLine( CmdLineOptions*, LPWSTR );

    //--------------------------------------------------------------------------------------

    // Main Program

    //--------------------------------------------------------------------------------------

    int WINAPI wWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow )

    {

         // Parse Command Line Arguments

        CmdLineOptions *CmdLine = new CmdLineOptions;

        ParseCommandLine(CmdLine, lpCmdLine);

         // Print Command Line Arguments

         printf("Method = %i \n" CmdLine->Method);

         printf("Hide   = %i \n" CmdLine->Hide);

         printf("Help   = %i \n" CmdLine->Help);

        return 0;

    }

    //--------------------------------------------------------------------------------------

    // Parse Command Line Arguments

    //--------------------------------------------------------------------------------------

    CmdLineOptions *ParseCommandLine( CmdLineOptions *CmdLine, LPWSTR lpCmdLine )

    {

        // Set Command Line Option Defaults

        CmdLine->Method = 0;

        CmdLine->Hide   = 0;

        CmdLine->Help   = 0;

        int numOptions  = 3;

        // Return if no Command Line Arguments

        if ( lpCmdLine == NULL )

        return CmdLine;

        wchar_t *tok;

        wchar_t delimiters[] = L" ,\t\n";

        wchar_t *next_tok = NULL;

        int argc = 0;

        wchar_t *argv[200];

        // Parse Command Line Arguments and populate argc and argv[].

        //

        // NOTE: wcscmp() errors if you compare the last token

        // from wcstok(), so count the number of arguments before

        // trying to do string comparisons.

        //

        tok = wcstok_s( lpCmdLine, delimiters, &next_tok);

        argv[argc] = tok;

        while ( tok != NULL )

        {

            argc++;

            tok = wcstok_s( NULL, delimiters, &next_tok);

            argv[argc] = tok;

        }

        int argNum=0;

        int argument=0;

        for ( argNum=2;argNum<=numOptions*2;argNum=argNum+2 )

        {

            if ( argc == argNum )

            {

                // If (argc == 2), do this once, if (argc == 4), do this twice, etc.

                for ( argument=0;argument<argc/2;argument=argument++ )

                {

                    if ( _wcsicmp( argv[argument*2], L"Method") == 0 )

                    {

                        CmdLine->Method = atoi((const char *)argv[argument*2+1]);

                    }

                    else if ( _wcsicmp( argv[argument*2], L"Hide") == 0 )

                    {

                        CmdLine->Hide = 1

                    }

                    else if ( _wcsicmp( argv[argument*2], L"Help") == 0 )

                    {

                        CmdLine->Help = 1;

                    }

                }

            }

        }

        argv[0] = '\0';

        // Make sure arguments are valid

        if ( CmdLine->Method  < 0 )

            CmdLine->Method = 0;

        if ( CmdLine->Method >= 2 )

            CmdLine->Method = 2;

        if ( CmdLine->Hide < 0 )

            CmdLine->Hide = 0;

        if ( CmdLine->Hide > 1 )

            CmdLine->Hide = 1;

        if ( CmdLine->Help < 0 )

            CmdLine->Help = 0;

        if ( CmdLine->Help > 1 )

            CmdLine->Help = 1;

        return CmdLine;

    }

____________________________

Copyright © 2010 by John F. Bergin.

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