[Cbc] Message printing with CbcSolver

[Kish Shen]

Hi,

Currently, during the solving of a MIP problem in my code, where CBC is 
called using the CbcMain0/CbcMain1 interface (which invokes CbcSolver, I 
believe), I get no printing of the messages from Cbc.

This is the behaviour I want normally, but recently some of our users 
have asked if they can see solver messages to get some idea of what the 
solver is doing. I have been unable to see any of Cbc's messages.

As far as I can tell, Cbc is not calling my messageHandler -- I don't 
know if this is because I have not passed the handler to the right place.

Here is an outline of the code I use, and if anyone can see what I need 
to do to get the Cbc messages, I would be very grateful:

CbcModel* model = new(...);

CbcMain0(*model);

DerivedHandler* mipMessageHandler = new DerivedHandler;
model->passInMessageHandler(mipMessageHandler);

model->solver()->setHintParam(OsiDoReducePrint, true, OsiHintTry);

const char* cbc_args[5];


cbc_args[0] = "eplexcbcclpsolver";
cbc_args[1] ="-preprocess"
cbc_args[2] = "on";
cbc_args[3] = "-solve";
cbc_args[4] = "-quit";
CbcMain1(5, cbc_args,*model,callBack);

[I hope there are no typos in the above; I was not able to cut and paste 
from my VNC window with the code listing to my Windows mailer]

DerivcedHandler is a derived class of CoinMessageHandler that sends the 
message to different streams depending on the externalNumber() of the 
message, and does seem to work (I can see Clp messages when solving a 
linear problem).

An aside: I remember John (Forrest) suggesting the use of 
CbcMain0/CbcMain1 to use the CbcSolver. I just tried to look up the 
documentation for them in Cbc's Doxygen documentation, but was not able 
to find them at all. Does anyone know where I can find the doucmentation?

Thanks in advance for any help!

--Kish Shen

-- 
This e-mail may contain confidential and privileged material for the
sole use of the intended recipient. Any review, use, distribution or
disclosure by others is strictly prohibited. If you are not the intended
recipient (or authorized to receive for the recipient), please contact
the sender by reply e-mail and delete all copies of this message.
Cisco Systems Limited (Company Number: 02558939), is registered in
England and Wales with its registered office at 1 Callaghan Square,
Cardiff, South Glamorgan CF10 5BT.