CPLEX Integration with .NET

[akash-sambrekar]

What version of OR-Tools and what language are you using?
Version: master/v7.3/v7.2 etc.
Language: C#

Which solver are you using (e.g. CP-SAT, Routing Solver, GLOP, BOP, Gurobi)

CPLEX

What operating system (Linux, Windows, ...) and version?
Windows 10

What did you do?
Steps to reproduce the behaviour
After cloning master branch, I execute the following commands
tools\make third_party
I added the WINDOWS_CPLEX_DIR = C:\Program Files\IBM\ILOG\CPLEX_Studio1210 in Makefile.Local
tools\make dotnet
If I try to run a examples with cplex with the following command , it doesn't work
make run SOURCE=examples/dotnet/BasicExample.cs

The project seems to work fine GLOP , SCIP but not with CPLEX
Error received:

WARNING: Logging before InitGoogleLogging() is written to STDERR
W00-1 -1:-1:-1.373535 20160 linear_solver.cc:609] Support for CPLEX not linked in, or the license was not found.
Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at BasicExample.Main() in C:\or-tools\examples\dotnet\BasicExample.cs:line 12
make: *** [makefiles/Makefile.dotnet.mk:462: run] Error -1073741819

[lperron]

can you try

make run SOURCE=examples/cpp/integer_programming.cc

[lperron]

Check the process. Make sure make clean is called after adding the WINDOWS_CPLEX_DIR to Makefile.local

I just did a fresh compilation from scratch.

Both examples/cpp/integer_programming.cc and examples/dotnet/csinteger_programming.cs works fine

(note that I tweaked the C# example to add the cplex option)

[akash-sambrekar]

Do I need to run tools\make clean_third_party or make clean after adding WINDOWS_CPLEX_DIR to Makefile.local ?

(Note :I have tweaked the C# example with the cplex option)

[lperron]

make clean Laurent Perron | Operations Research | ***@***.*** | (33) 1 42 68 53 00 Le mer. 31 mars 2021 à 11:52, Akash Sambrekar ***@***.***> a écrit :

…

Do I need to run tools\make clean_third_party or make clean after adding WINDOWS_CPLEX_DIR to Makefile.local ? (Note :I have tweaked the C# example with the cplex option) — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub <#2470 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUPL3LSHHB2KDMZBWB2EH3TGLWG7ANCNFSM42B57TLA> .

[akash-sambrekar]

Yes it works now Laurent !..
Thank you for the help

[Mizux]

For the record stable (8.2) contains an harcoded version

or-tools/makefiles/Makefile.win.mk

Lines 120 to 125 in fa84bc0

	ifdef WINDOWS_CPLEX_DIR
	CPLEX_INC = /I"$(WINDOWS_CPLEX_DIR)\\cplex\\include" /DUSE_CPLEX
	CPLEX_SWIG = -I"$(WINDOWS_CPLEX_DIR)/cplex/include" -DUSE_CPLEX
	STATIC_CPLEX_LNK = "$(WINDOWS_CPLEX_DIR)\\cplex\\lib\\x64_windows_msvc14\\stat_mda\\cplex12100.lib"
	DYNAMIC_CPLEX_LNK = $(STATIC_CPLEX_LNK)
	endif