Tcl/Tk : Another hello world

Hello world using tcl/tk presented below may be more clear than oneliner before.

  1. create a label named .label1 with hello world text
  2. create a button named .button1 with OK text and will do exit when clicked.
  3. pack .label1 to make it showed on screen.
  4. pack .button1 to make it showed on screen below .label1.

Here is the result.

Done.

Tcl/Tk Hello world in a line

Creating classic hello world program using GUI in Tcl/Tk can be done in few lines or may be only a line !

Oneliner can do below.

pack [button .b1 -text “Hello World” -command exit -width 50]

This line can be read : pack a button named .b1 with hello world text and exit command when clicked.

Save it to hello_oneline.tcl then run on command prompt : wish hello_oneline.tcl.

Voila!

Click the button and the window will close.

Bye ..

Installing TCL on OpenBSD 6.6

To bring tcl/tk programming language and some database connectivity for tcl on OpenBSD do command below as root :

pkg_add tcl tk sqlite3-tcl pgtcl

OpenBSD 6.6 can install tcl/tk 8.5 and 8.6.

Two extra package named sqlite3-tcl and pgtcl will give tcl capability to work with sqlite3 database and postgresql database.

Tdbc also a good choice for database connectivity. Tdbc packages on OpenBSD available for mysql, postgres, sqlite3. To add tdbc , we can do pkg_add tdbc-postgres tdbc-mysql tdbc-sqlite3.

Later will write more about tcl/tk.