On Jun 10, 2011, at 9:56 PM, William Squires wrote:
> 1st question:
> In regular C, you have the <stdio.h> functions for reading/writing to stdio;
> printf(), scanf(), etc...
> In C++, you have cin/cout and the overridden '>>' and '<<' operators.
> What does ObjC have (besides NSLog() anyway) that C/C++ doesn't?
> I'm guessing... zilch. You have to use the standard C libraries, right? Or
> is there an OO way of reading/writing to stdio (and stderr) from a console
> app? Or use ObjC++...
NSFileHandle has the class methods:
• + fileHandleWithStandardError
• + fileHandleWithStandardInput
• + fileHandleWithStandardOutput
• + fileHandleWithNullDevice
However, NSFileHandle does not have many of the line-oriented or
format-oriented mechanisms provided by the C or C++ standard libraries. So, it
is often more convenient to use those. Objective-C was built on top of C
precisely so that you have access to C language and library features, so
there's nothing wrong with using them.
> 2nd question:
> Can a console app control the text 'cursor' in Terminal.app's window solely
> through stdio? (i.e. are there control codes that clear the screen, locate
> the cursor at some x,y location, set the text color/brightness (I know the
> man page reader can, at the very least, change the text brightness), position
> the cursor at the beginning/end of a line, etc...) Or do apps like vim,
> emacs, pico, etc... use custom machine-language calls to the darwin core to
> do this?
> If it helps, under Terminal.app's Prefs | Text, I have "Use bold fonts",
> "Allow blinking text" and "Display ANSI colors" all checked, and under Prefs
> | Window I have window size set for 80x24 with unlimited scrollback, and
> under Prefs | Advanced, I have "Declare terminal as:" set to xterm-color,
> "Paste newlines as carriage returns" and "Scroll to bottom on input" checked.
You're looking for the "curses" library (or, to be more specific, "ncurses"
nowadays).
http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/ncurses.3x.html
Regards,
Ken
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