XPRS_msp_addcbmsghandler
XPRS_msp_addcbmsghandler |
Purpose
Declares an output callback function, called every time a line of message text is output by the MIP solution pool. This callback function will be called in addition to any output callbacks already added by
XPRS_msp_addcbmsghandler.
Synopsis
int XPRS_CC XPRS_msp_addcbmsghandler(XPRSmipsolpool msp, int (XPRS_CC *f_msghandler)(XPRSobject vXPRSObject, void * vUserContext, void * vSystemThreadId, const char * sMsg, int iMsgType, int iMsgNumber), void * p, int priority);
Arguments
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msp
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The current MIP solution pool
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f_msghandler
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The callback function which takes six arguments,
vXPRSObject,
vUserContext,
vSystemThreadId,
sMsg,
iMsgType and
iMsgNumber. Use a NULL value to cancel a callback function.
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vXPRSObject
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The object sending the message. Use
XPRSgetobjecttypename to get the name of the object type.
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vUserContext
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The user-defined object passed to the callback function.
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vSystemThreadId
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The system id of the thread sending the message caste to a void *.
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sMsg
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A null terminated character array (string) containing the message, which may simply be a new line. When the callback is called for the first time
sMsg will be a NULL pointer.
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iMsgType
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Indicates the type of output message:
A negative value means the callback is being called for the first time.
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iMsgNumber
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The number associated with the message. If the message is an error or a warning then you can look up the number in the section Optimizer Error and Warning Messages for advice on what it means and how to resolve the associated issue.
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p
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A user-defined object to be passed to the callback function.
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priority
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An integer that determines the order in which multiple output callbacks will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
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Further information
To send messages to a log file the built in message handler
XPRSlogfilehandler can be used. This can be done with:
XPRS_msp_addcbmsghandler(msp, XPRSlogfilehandler, "log.txt");
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