.. on Linux

Apple

Further libssh2 wrapper updates

Posted by on Nov 13, 2012 in Apple, Linux, Xcode | 0 comments

I’ve written a small shell script that takes the archive downloaded from http://www.libssh2.org, extracts it, compiles it, extracts the headers and archive library and then tidies up after itself. The results just need adding to Xcode and you have a working libssh2 implementation.

Updated source code:

https://github.com/thebsdbox/DFSSHWrapper

Read More

Update to the sshwrapper

Posted by on Sep 13, 2012 in Apple, Computers, Linux | 0 comments

Had quite a few emails recently about using the ssh wrapping class I wrote aaaages ago. I’ve traded a couple of emails back and forth.. and decided that it would be easier for everyone if I just updated these old classes.

So the changes:

  • Added DFSSHConnectionType, this class is used to define how ssh will attempt to connect (password/key/keyboard)
  • Moved everything to a namespace (DF)
  • ARC
  • Tidied up the code, and sorted an issue with CStrings making a mess when converting to an NSString
  • Other things I did ages ago.. (no idea)

It’s uploaded to github.. let me know if there is any problems..

https://github.com/thebsdbox/DFSSHWrapper

 

[UPDATE]: Added the ability to place a timeout on a command sent over ssh…

Read More

Objective-C graphing and plotting with little-plot

Posted by on Apr 24, 2012 in Apple, Computers, Xcode | 2 comments

As development has continued on a personal project it became obvious that I would need to implement UI elements that simply weren’t part of the Cocoa UI-kit. Essentially the main goal is presenting the user with a graph interface allowing them to quickly see a data set without having to read through line after line of figures. I looked at Core Plot (http://code.google.com/p/core-plot/), which whilst providing some great functionality looks like a HUGE amount of overkill when wanting a simple UI element.

So after a few days of tinkering I’ve created a couple of NSView subclasses allowing either manually created Views that can be presented arrays and will display the data accordingly.
I present Little-plot :

The above screenshot consists of three NSViews (LineView, PieView and LabelView), which each display a line graph, a pie chart and graph labels (or legends).

The project is available on GitHub here.

Updates will appear soon, along with some real documentation.

Read More

Objective-C modal Window using sheets and Panels

Posted by on Nov 7, 2011 in Apple, Xcode | 2 comments

Adding a modal sheet to a window in objective-C isn’t highly complicated however there are a number of issues to watch for that can leave you scratching your head. Most of the examples I’ve found on the internet point to an older useModal: (*window) function which is deprecated. From what i’ve read, the correct manner for using a modal dialog is to display a sheet that scrolls down from the menu bar and takes modal control. There are numerous examples of this in System Preferences:

Implementing this in an application coded with objective-C isn’t relatively complicated  however missing a particular setting can leave you with numerous errors or causing the application to fall back to the debugger.

Read More

Cocoa libssh2 wrapper

Posted by on Oct 24, 2011 in Apple, Xcode | 16 comments

I’ve modified a simple wrapper for the libssh2 library that now has the following functionality:

  • Code moved to separate classes to allow reusability
  • Multiple sessions to different servers can be achieved with a few lines of code
  • A Session can be passed to the operator class allowing operations (commands sent to it), more will be added
At the current time it connects fine to OSX and Linux sshd however I can’t connect to ESXi even with the correct password it reports incorrect, However I think I Can resolve this shortly.
Original wrapper (designed for iOS) can be found from http://lukehagan.com/ in his Git Repo.
Download here: SSH Wrapper
Read More

SSH with Cocoa (Xcode and libssh2)

Posted by on Oct 23, 2011 in Apple, Xcode | 0 comments

I fought with this about a year ago, and for some strange reason never managed to get things to compile or link. I chalk this down now to my lack of understanding with Objective-C/linking concepts. However it turns out that it is relatively simple (ensure you have Xcode 4 installed before trying).

  1. Point browser to http://www.libssh2.org/ and download the latest snapshot to a temporary location.
  2. Open a terminal window and navigate to the directory containing the the source files and run the following: 
    dan$ ./configure
  3. This will output numerous content to the terminal window, present a summary of the configuration options and create a header file needed for compilation. (Running make / make install is NOT required).
  4. Open Xcode and create a new Xcode project, which should be a (Mac OS X -> Framework & Library -> C/C++ Library) and give it a Product Name (e.g. libssh2) and ensure that the type is Static then click create.
  5. Xcode will open with an empty project displaying the Build Settings. At this point we can start adding the files that are part of the libssh2 source tree.
Read More