31.5. The main function

The main function of the program is where the user instantiates the experiment specific filters and registers them to the framework. The framework clones the filter objects and manages the cloned objects. The original filter objects are left to the user to clean up. The SkeletonMain.cpp file contains the main function for the filter kit.

#include <iostream>
#include <CFatalException.h> 
#include <CFilterMain.h>     

#include "CTemplateFilter.cpp"     

int main(int argc, char* argv[])
{
  int status = 0;

  try {

    // Create the main
    CFilterMain theApp(argc,argv); 


    // Construct filter(s) here.
    CTemplateFilter user_filter;   

    // Register the filter(s) here. Note that if more than
    // one filter will be registered, the order of registration
    // will define the order of execution. If multiple filters are
    // registered, the output of the first filter will become the
    // input of the second filter and so on. 
    theApp.registerFilter(&user_filter); 

    // Run the main loop
    theApp();                       

  } catch (CFatalException exc) {   
    status = 1;
  } catch (...) {                   
    std::cout << "Caught unknown fatal error...!" << std::endl;
    status = 2;
  }

  return status;
}
    

In the discussion below, the numbers refer to the same numbers in the example above.