This class allows to temporarily suspend logging. All calls to the log functions during the life time of an object of this class are just ignored.
In particular, it can be used to suppress the log messages given by wxWidgets itself but it should be noted that it is rarely the best way to cope with this problem as all log messages are suppressed, even if they indicate a completely different error than the one the programmer wanted to suppress.
For instance, the example of the overview:
// wxFile.Open() normally complains if file can't be opened, we don't want it
if ( !file.Open("bar") )
... process error ourselves ...
} // ~wxLogNull called, old log sink restored
wxLogMessage("..."); // ok
would be better written as:
// don't try to open file if it doesn't exist, we are prepared to deal with
// this ourselves - but all other errors are not expected
if ( wxFile::Exists("bar") )
// gives an error message if the file couldn't be opened