On 03/15/2010 12:31 PM, Joost van der Sluis wrote: > > It works perfectly. You can use it to compile any fcl-web application > against. So that there are no dependencies on external gui-libraries > (like gtk, qt etc) >
OK. "Works" here obviously means that it helps the application to be compiled, but it does not provide much functionality to the Application. Especially (other than the other 8 Widget Types) it does not implement an event queue (or attach to one provided by the OS). That is why a TTimer will not be usable. The NoGUI Widget Type does allow for "fcl-web" applications, that are normal CGI program. I.e. started by the web server and is provided with information by same via environment variables, a web page is only transferred to the web server when the cgi program closes. The NoGUI Widget Type does not allow for "persistent" CGI applications. I.e. the cgi program keeps running and is provided by the web server with informations via a pipe or TCP/IP connection. It send a web page to the web server via a pipe or the TCP/IP connection appropriately. (Not all web servers allow for this method; Apache does. To do a decent "persistent" CGI applications you need to use timers, TCP/IP, threads etc: all this stuff creates asynchronous events that need to fire application "events" in the main thread, which keeps on waiting for such events independently of the CGI activity, On top of this, on the Web Client site there are methods (provided by Java script applets) that allow for monitoring the activity of such a program using a kind of polling on a kept-open HTTP connection. This is based on AJAX and is called Comet. While doing a "persistent CGI program" is one application for an event-queue enabled NoGUI Application (that avoids any dependencies on external gui-libraries) my target is embedded devices which don't provide any hardware that could enable a GUI. That is why I am planning to enhance it (supposedly calling the result "Linux-NOGUI" Widget Type) -Michael -- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
