CODEWITHSUNDEEP
tcl
user1497818
user1497818

Reputation: 375

How to treat tcl string as a hex number and convert it into binary?

I have a tcl string set in a variable. I want to treat it as a hex to convert into binary of it. Can anybody help me to achieve this.

Here is what i am doing :

$ /usr/bin/tclsh8.5
% set a a1a2a3a4a5a6
a1a2a3a4a5a6
% set b [ string range $a 0 3 ]
a1a2

Now i want that a1a2 value of variable "b" should be treated as 0xa1a2, so that i can convert it into binary. Please help me to solve this.

Upvotes: 2

Views: 13300

Answers (1)

Johannes Kuhn
Johannes Kuhn

Reputation: 15163

If you are using Tcl 8.6, then binary decode hex is the best choice:

binary decode hex $b

If you are using an older version of Tcl, then you have to use the binary format with the H format specifier:

binary format H* $b

You can write the resulting byte array to a file or send it through a socket etc, but if you want to display it as text, I suggest converting it to a string first:

encoding convertfrom utf-8 [binary format H* $b]

Upvotes: 5

Related Questions