Originally posted by: ziczyq

Hi,

How do I save the screen output into a text file? i.e., the screen output is 

-----------------------------------------------------------------------

Root node processing (before b&c):
  Real time             =    0.02 sec. (3.43 ticks)
Parallel b&c, 16 threads:
  Real time             =    0.00 sec. (0.00 ticks)
  Sync time (average)   =    0.00 sec.
  Wait time (average)   =    0.00 sec.
                          ------------
Total (root+branch&cut) =    0.02 sec. (3.43 ticks)
solution status = 102
Extensive formulation with cuts objective value = 7100.16
Extensive formulation with cuts solution time = 0.009
Extensive formulation relative MIP gap = 7.01316e-05
Default row names c1, c2 ... being created.

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I want to save it in a text file using callable library. Thanks!

You can use CPXsetlogfilename for that. See also the admipex3.c example that is included when you install CPLEX. Finally, the Controlling Output in the CPLEX Callable Library (C API) section of the documentation has additional functions which may be of interest to you.