CLAP - Simple Example

// example1.cc
// ~~~~~~~~~~~

#include <fstream.h>
#include <cmdline.hh>

CmdArgInt    width('w' ,"width" ,"width"    ,"The width of the object");
CmdArgInt   height('h' ,"height" ,"height"   ,"The height of hte object",
     CmdArg::isREQ | CmdArg::isVALREQ, 10);
CmdArgStr filename('f' ,"file"   ,"filename" ,"The filename to read",
     CmdArg::isOPT | CmdArg::isVALREQ, "unname.txt");

int main(int argc, char* argv[])
{
CmdLine cmd(argv[0], &filename, &width, &height, NULL);
cmd.parse(argc, argv);

ofstream infile(filename);
cout << "the file " << filename << " were open to read." << endl;

int surface = width * height;
cout << "surface = width x height = " << width << " x "
<< height << " = " << surface << endl;

return 0;
}

compilation

% g++ -I/users/silver2/projects/cgproj/package/include example1.cc -L/users/silver2/projects/cgproj/package/lib -lcmd -o example1

running examples

% example1
Error: the switch -height must be supplied

Usage: example1 -height height -width width [-file filename]
Where:
       height - The height of hte object
        width - The width of the object
     filename - The filename to read

% example1 -height
Error: switch -height must take an argument

Usage: example1 -height height -width width [-file filename]
Where:
       height - The height of hte object
        width - The width of the object
     filename - The filename to read

% example1 -h t
invalid integer value "t"
Error: switch -height must take an argument

Usage: example1 -height height -width width [-file filename]
Where:
       height - The height of hte object
        width - The width of the object
     filename - The filename to read

% example1 -h 5 -w 3
the file unname.txt were open to read.
surface = width x height = 3 x 5 = 15
% example1 -h 5 -w 12 -f infile.dat
the file infile.dat were open to read.
surface = width x height = 12 x 5 = 60
%

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