Hi All,
I have never written a console app and was wondering 2 things. Firstly, if I was to write an app that doesn't require a GUI, that runs on both Windows and Linux (with no XServer) is that classed as a console app? And secondly, is it fairly straight forward to write a console app that stores and retrieves data from a Firebird database, on the basis that I want to be able to use either the standard Lazarus components (or Zeos) to talk to the database?

Thanks in advance

Richard
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Richard Mace wrote

I have never written a console app and was wondering 2 things. Firstly, if I was to write an app that doesn't require a GUI, that runs on both Windows and Linux (with no XServer) is that classed as a console app?

Yes, it would.

And secondly, is it fairly straight forward to write a console app that stores and retrieves data from a Firebird database, on the basis that I want to be able to use either the standard Lazarus components (or Zeos) to talk to the database?

Well, they're standard FPC components[1] rather than Lazarus components then... (So follow up questions probably belong on the FPC list rather than the Lazarus one)

See
http://wiki.lazarus.freepascal.org/Database_bug_reporting#FreePascal for a simple example, but you can work with queries etc just as you're used to with Lazarus

[1] FPC's sqldb, which is also used by Lazarus GUI components

Hi All, I have never written a console app and was wondering 2 things. Firstly, if I was to write an app that doesn't require a GUI, that runs on both Windows and Linux (with no XServer) is that classed as a console app?

Yes.

And secondly, is it fairly straight forward to write a console app that stores and retrieves data from a Firebird database, on the basis that I want to be able to use either the standard Lazarus components (or Zeos) to talk to the database?

Yes.

Mattias

A problem might be that there (right now) is no "Widget Type" in Lazarus, that has no GUI binding and allows for using stuff like TTimer, TThread.Synchronize, TThread.Queue and QueuAsyncCall().

In fact I am planning to do such a Widget Type, but unfortunately I currently am busy with unrelated things.

-Michael
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Michael Schnell wrote

A problem might be that there (right now) is no "Widget Type" in Lazarus, that has no GUI binding and allows for using stuff like TTimer, TThread.Synchronize, TThread.Queue and QueuAsyncCall().

The NoGUI WS doesn't allow this?

Bart

Bart wrote

The NoGUI WS doesn't allow this?

No. It does not provide an Event Queue for the main thread.

-Michael

The NoGUI has not implemented it.
Feel free to add it.

Mattias

Mattias Gaertner wrote

Feel free to add it.

It's not as impossible as I initially thought, as the fpc RTL already provides the basic Queue implantation that can be used (while all other "active" Widget Types use a queue provided by the GUI infrastructure they attach to).

Doing TTimer needs some afterthoughts: there are multiple ways, each with some pro's and cons: e.g.
- simply using the "timeout" parameter of the RTL queue "poll" procedure,
- doing one or several dedicated threads with "sleep()" for handling the timers, feeding timer events into the queue
- ...

-Michael

I have never written a console app and was wondering 2 things.

Ah, yes. That would be ab issues as using a TTimer would be essential for what I am planning :(

Richard
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