XSLPsetcbmessage
XSLPsetcbmessage |
Purpose
Set a user callback to be called whenever Xpress NonLinear outputs a line of text
Synopsis
int XPRS_CC XSLPsetcbmessage(XSLPprob Prob, void (XPRS_CC *UserFunc) (XSLPprob myProb, void *myObject, char *msg, int len, int msgtype), void *Object);
Arguments
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Prob
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The current SLP problem.
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UserFunc
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The function to be called whenever Xpress NonLinear outputs a line of text.
UserFunc does not return a value.
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myProb
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The problem passed to the callback function.
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myObject
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The user-defined object passed as
Object to
XSLPsetcbmessage.
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msg
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Character buffer holding the string to be output.
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len
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Length in characters of
msg excluding the null terminator.
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msgtype
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Type of message. The following are system-defined:
A negative value indicates that the Optimizer is about to finish and any buffers should be flushed at this time. |
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Object
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Address of a user-defined object, which can be used for any purpose by the function.
Object is passed to
UserFunc as
myObject.
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Example
The following example creates a log file into which all messages are placed. System messages are also printed on standard output:
FILE *logfile;
logfile = fopen("myLog","w");
XSLPsetcbmessage(Prob, CBMessage, logfile);
A suitable callback function could resemble the following:
void XPRS_CC CBMessage(XSLPprob Prob, void *Obj,
char *msg, int len, int msgtype) {
FILE *logfile;
logfile = (FILE *) Obj;
if (msgtype < 0) {
fflush(stdout);
if (logfile) fflush(logfile);
return;
}
switch (msgtype) {
case 1: /* information */
case 3: /* warning */
case 4: /* error */
printf("%s\n",msg);
default: /* user */
if (logfile)
fprintf(logfile,"%s\n",msg);
break;
}
return;
}
Further information
If a user message callback is defined then screen output is automatically disabled.
Output can be directed into a log file by using XSLPsetlogfile.
Related topics