Do you need a Tcl tutorial ? Salvatore write one that we can read online here :
http://www.invece.org/tclwise/
Also check out a n interesting Tcl language implementation here :
http://jim.tcl.tk
Update : My First Tcl/Tk Application
The notes application now is more sophisticated : can add note and browse note by note id. Search by keyword still a to do task but its give a lot of experience coding in tcl/tk.
Download source code here
My first Tcl/Tk Application
Warning still in progress and still learning how to code tcl/tk.
Extract and execute using wish notes_sqlite3.tcl
Tcl/Tk : Another hello world
Hello world using tcl/tk presented below may be more clear than oneliner before.
- create a label named .label1 with hello world text
- create a button named .button1 with OK text and will do exit when clicked.
- pack .label1 to make it showed on screen.
- 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 ..
TCL : Useful proc to write message to log file
Logging application activity to a log file is a best practice to do by a programmer. Here is how we can do it in Tcl scripting language.
Line 1 to 7 is a proc definition named writelog with a parameter. Parameter will contain message to be written to log file located in d:/applogYYYYMMDD.txt based on current date of clock command. Different day will have a different log file.
Line 9 to 17 is some test to writelog. If we pass hello as parameter to writelog command then “YYYY-MM-DD HH:mm:ss : hello” will be written to log file. Every call to writelog will create new line and put current date time on the beginning of line.
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.