Add in file menu "Calculate TTH of file"

Not sure what you mean by having to find it in search window. Do you mean having to find it in File -> Open own list? You just browse your list and right click to copy magnet. I don't think we need to add an option to just copy TTH, your friend's client should be able to support magnets.

If you just want to calculate the TTH of a file, there's already a standalone program that does that called "tthsum".

As far as lackluster magnet support, please see bug #361735.

i often need calculate tth of file wich don't exist in my share (by restrictions on one hub from my hub list) but i have that file, tthsum is it console application? it's very uncomfortable, and i know, i can write script for nautilus, and got tth by rightclick on the file, BUT i think it's incorrect, because:

i think, if i want to work with dc++ network, better way if i got what i want uses 1 application. I mean if anybody whant use dc++, he install linuxdcpp and got pleasure. without writing scripts, or searching in repo other applications needed for use dc++, and without need to run console and etc... can i just click on button and got what i want?

and now.... bout magnet. in bug 361735, requesting console key for downloading magnet. it's don't what i mean. it's good .... for firefox integration (click on link on webpage and start downloading), but i think it's not so hard to add menuitem with that function.

PS Sorry for my english, talk on it very difficult for me.

I personally don't think it's anymore inconvenient to use a command line program than it is to use a dialog, but maybe that's just me. We won't be implementing this in LinuxDC++ directly, but maybe once we implement a plugin system (see bug #279503) this feature can be implemented as a plugin.