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Top Forums UNIX for Dummies Questions & Answers From iOS programming to Linux system programming Post 302797389 by verdepollo on Monday 22nd of April 2013 01:23:29 PM
Old 04-22-2013
1) I'd say barely. It is useful since underlying platform is a lot similar to Unix and it gives you better understanding of how things work under the hood but -as an iOS programmer- you do not have direct access nor control of the OS, and all tasks *MUST* be performed with Cocoa/CocoaTouch framework tools.
Don't expect to be using SSH, grep, netstat, nfs, df, bash buit-ins, etc in any of your programs.

2) Again, you won't be dealing with syscalls, forking, IRQs, etc. It's not necessary at all; however it's a good plus. Even if you're into multi-threaded programming, Cocoa handles everything without (much) hassle.

3) I'm not a Linux programmer myself but if you are already proficient with Objective-C you're most certainly a capable C programmer so you'd at least be able to "talk" in same language. Now you'd only need to learn the internals of Linux and get familiar with its code.

Last edited by verdepollo; 04-22-2013 at 02:37 PM.. Reason: typo
 

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mapiconcepts(3) 						MAPIClientLibraries						   mapiconcepts(3)

NAME
mapiconcepts - MAPI Concepts MAPI objects Almost any MAPI data you access, read or edit is associated with an object. No matter whether you intend to browse mailbox hierarchy, open folders, create tables or access items (messages, appointments, contacts, tasks, notes), you will have to initialize and use MAPI objects: object understanding and manipulation is fundamental. o When developing MAPI clients with Microsoft framework, instantiated objects inherit from parent classes. As a matter of fact, developers know which methods they can apply to objects and we suppose it makes their life easier. o In OpenChange, objects are opaque. They are generic data structures which content is set and accessed through MAPI public functions. Therefore, Linux MAPI developers must know what they are doing. An example of MAPI object manipulation is shown below: mapi_object obj_store; [...] mapi_object_init(&obj_store); retval = OpenMsgStore(&obj_store); if (retval != MAPI_E_SUCCESS) { mapi_errstr('OpenMsgStore', GetLastError()); exit (1); } mapi_object_release(&obj_store); MAPI Handles Beyond memory management considerations, understanding MAPI handles role in object manipulation provides a better understanding why mapi_object_release() matters. Handles are temporary identifiers returned by Exchange when you access or create objects on the server. They are used to make reference to a particular object all along its session lifetime. They are stored in unsigned integers, are unique for each object but temporary along MAPI session. Handles are the only links between objects accessed on the client side and efficiently stored on the server side. Although OpenChange MAPI makes handles manipulation transparent for developers, mapi_object_release() frees both the allocated memory for the object on client side, but also releases the object on the server. Version 1.0 Sat Jun 14 2014 mapiconcepts(3)
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