Re: Error on ActiveGraph class application

[Manor Askenazi]

Hi Frank,

In Objective-C declaring a variable to be of a particular class does not 
automatically generate an instance of that class in the variable. In other
words the variable is initialized to nil.

Therefore in your code, is initialized to nil.

 --------
  BLTGraph *mflowGraph;
  GraphElement *materialElement;
  ActiveGraph  *mflowGrapher;

  StatusM *statusM;

And therefore the statement:

  [mflowGrapher setDataFeed: statusM]; 

is setting the DataFeed on mflowGrapher to nil. The grapher therefore 
complains since it does not have a valid feed object.

You would therefore need to create the object statusM before giving it
as a dataFeed to the grapher by (for example) inserting the statement:

  statusM = [StatusM create: globalZone] ;
  
between the declaration of statusM and its use...

Regards,

Manor.