[Insight-users] why can not write observation to file?

[Luis Ibanez]

Hi Yu,

It seems that you forgot to close the file.

Note that instead of the old fprintf approach,
it is much easier now to use ofstreams.


Like


         #include <fstream>


         std::ofstream myFile;
         myFile.open("filename.txt");
         myFile << "I like fstreams" << std::endl;
         myFile.close();



   Regards,


      Luis



----------------------
Yu Qi wrote:

> Hi,
> I want to write the result of observer to a file called Observer_Result.txt
> and my code is as follows, but why there is onthing in the file?
>  
>  
>  void Execute(const itk::Object * object, const itk::EventObject & event)
>     {
>       OptimizerPointer optimizer =
>         dynamic_cast< OptimizerPointer >( object );
>       if( typeid( event ) != typeid( itk::IterationEvent ) )
>         {
>         return;
>         }
>       std::cout << optimizer->GetCurrentIteration() << "   ";
>       std::cout << optimizer->GetValue() << "   ";
>       std::cout << optimizer->GetCurrentPosition() << std::endl;
>     /////////////////////////////////write to file
>     FILE *stream1;
>    char fileName1[]= "Observer_Result.txt";
>     if( (stream1 = fopen( fileName1, "a+t" )) != NULL )
>     { 
>     fprintf( stream1, "%d\t", optimizer->GetCurrentIteration());
>     fprintf( stream1, "%e\t",optimizer->GetValue());
>     OptimizerType::ParametersType observerParameters =
>                     optimizer->GetCurrentPosition();
>    
>     fprintf( stream1, "%e\t",  observerParameters[0]);
>     fprintf( stream1, "%e\t",  observerParameters[1]);
>     fprintf( stream1, "%e\t",  observerParameters[2]);
>     fprintf( stream1, "%e\t",  observerParameters[3]);
>     fprintf( stream1, "%e\t",  observerParameters[4]);
>     fprintf( stream1, "%e\t\n",  observerParameters[5]);
>   }
>  
>     }
> 
> 
> *Best Regards!*
> ** 
> *Yu Qi*
>  
>  
> 
> 
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