Capturing infolog messages

I had a requirement to retrieve the content of infolog and store it in log tables, made to track the progress of a batch job and take action on any errors. I used the below method in a catch statement handling all unexpected errors and at the same time updating error log tables. The while loop retrieves all the infolog errors using SysInfologEnumerator and SysInfologMessageStruct infolog classes and concatenating a string with the error messages.

 private str getErrorStr()  
 {  
   SysInfologEnumerator enumerator;  
   SysInfologMessageStruct msgStruct;  
   Exception exception;  
   str error;  
   enumerator = SysInfologEnumerator::newData(infolog.cut());  
   while (enumerator.moveNext())  
   {  
     msgStruct = new SysInfologMessageStruct(enumerator.currentMessage());  
     exception = enumerator.currentException();  
     error = strfmt("%1 %2", error, msgStruct.message());  
   }  
   return error;  
 }  

And the catch statement calling the above method.

   catch (Exception::Error)  
   {  
     ttsbegin;  
     mmsStagingPurchImport.selectForUpdate(true);  
     mmsStagingPurchImport.Error = true;  
     mmsStagingPurchImport.ErrorLog = this.getErrorStr();  
     mmsStagingPurchImport.update();  
     ttscommit;  
     retry;  
   }