[vtk-developers] Automatic input for examples?

[Bill Lorensen]

Looks good, but the testing infrastructure allows the addition of a
trailing -I flag, so you should test argc < 2.

On the other hand, if we start mucking up the examples with test code,
we they start looking more like tests which is something that started
this whole thing.

For now, I would not add the additional code. When the examples are
run as tests, the ADD_TEST command provides the data on the command
line.

ADD_TEST(${KIT}-Finance ${EXECUTABLE_OUTPUT_PATH}/${KIT}CxxTests
TestFinance ${VTK_DATA_ROOT}/Data/financial.txt)

Bill

On Wed, Jan 13, 2010 at 6:35 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> What do you guys think of using something like this for examples which
> require an input file:
>
>  vtkstd::string inputFilename;
>
>  bool hasVTKData = false;
> #ifdef VTK_DATA_ROOT
>  hasVTKData = true;
> #endif
>  if(argc != 2 && !hasVTKData) //if the user did not pass the right arguments
>    // and doesn't have VTKData
>    {
>      cout << "Required arguments: InputFilename" << endl;
>      return EXIT_FAILURE;
>    }
>
>  if(argc != 2 && hasVTKData) // the user didn't pass the right arguments, but
>    // does have VTKData
>    {
>    inputFilename = vtkstd::string(VTK_DATA_ROOT) + "/Data/political.vtp";
>    cout << "Using file " << inputFilename << " from VTKData." << endl;
>    }
>
>  if(argc == 2)//the user passed the correct arguments
>    {
>    inputFilename = argv[1];
>    cout << "Using file " << inputFilename << " from command line." << endl;
>    }
>
> This way if the user wants to use his own data file, he can use it,
> but if he does not, it will automatically grab a reasonable file from
> VTKData.
>
> Clearly we wouldn't want to clutter up the examples with all of that
> code, but it could easily be wrapped into a function.
>
> Thoughts?
>
> Thanks,
>
> David
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