Originally posted by: Ximenes

Hi, everyone, when I ran my program compiled in Visual Studio 2010 with C++ calling Cplex, I was told an error that "using empty handle". I had no idea about it. I want to the most frequent reason that cause the error. Can you help me?
Thank you.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

You are probably passing an empty handle (basically, a null pointer) as an argument in a function call. Look for a function argument that is uninitialized. On a different thread, this bug arose because someone passed an pointer to an array of model objects (perhaps IloNumVarArray) that was smaller than it needed to be (resulting in a bounds violation when CPLEX accessed the array).

Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

One frequent issue is instantiating a subclass of IloExtractable without an env argument, i.e.,

IloNumVar v;
v.setLB(0);

instead of

IloNumVar v(env);
v.setLB(0);

The easiest thing to narrow down your problem is to use a debugger and figure out where exactly that problem occurs. This will most probably also tell you what instance it is that is not initialized properly.
#CPLEXOptimizers
#DecisionOptimization