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I have an application that is going to be living in the SysTray (or on the Mac: in the menu bar) and I really don't like my users to see the mainform when they start the application - the idea being that the application should automatically start when the computer starts.
So after some searching I found a solution that does the trick (Lazarus Forum).
Simply open your project file (the .lpr file) - this can be done directly or by clicking the "Project" menu, choose "Project Inspector" and under files double click the ".lpr" file.
In the project code add the line "Application.ShowMainForm:=FALSE" right before the "Application.CreateForm()" line.
This will prevent the main form to show at startup - I have tested this under Windows and MacOS X and it works.
For example:
program ExmpleProg;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Interfaces, // this includes the LCL widgetset
Forms, mainunit
{ you can add units after this };
{$R *.res}
begin
RequireDerivedFormResource := True;
Application.Initialize;
Application.ShowMainForm := FALSE; // <- this line prevents the window from showing
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
