Initializing help system before first use

# XPRDsetmsgcb

Purpose
Set the message callback.
Synopsis
`void XPRDsetmsgcb(void *ctx, long (*cbmsg)(void*,void *,char *,unsigned long));`
Arguments

ctx | Context to be passed to the callback routine
cbmsg | Message callback. The first argument is always NULL; the second corresponds to ctx, the two final ones are the message buffer and its length

Further information
By default, messages produced by the library are sent to the default error stream.
Related topics
XPRDsetmsglev.
Parent Topic Connection manager

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