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The debug server is a simple program that listens for debug messages,
and displays them in a list. The messages can be saved, cleared, it can
be paused - whatever.
It is the server part to a standard FPC unit - dbugintf. This unit
offers a simple API to send messages to a debug server (using
simpleIPC), modeled after the GExperts GDebug tool for Delphi, with
some minor enhancements.
Typical usage is as follows (I stripped actual code and {$ifdef debug}):
uses dbugintf,sysutils;
Procedure BackupFile(FN : String);
Var
BFN : String;
begin
SendMethodEnter('BackupFile');
BFN:=FN+'.bak';
SendDebug(Format('backup file "%s" exists, deleting',[BFN]));
SendDebug(Format('Backing up "%s" to "%s"',[FN,BFN]));
SendMethodExit('BackupFile');
end;
Procedure SaveToFile(FN : String);
begin
SendMethodEnter('SaveToFile');
BackupFile(FN);
SendDebug('Saving to file '+FN);
SendMethodExit('SaveToFile');
end;
There are some more methods as displayed here.
Output would look as in the attached screenshot. It is extremely useful
when debugging GUI code with lots of events - because you see the
messages as they are sent, in a separate window which can be kept 'on
top'. We also use it to debug our server applications. The indentation
of the messages (by SendMethodEnter) is intentional: if an exception
occurs, then the SendMethodExit does not happen, and you see that
something is wrong visually.
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