C++ I/O on Linux (Ubuntu)

[xlinuks]

Hi, I'm learning C++, moving from Java.
I wonder what libraries do C++ developers use on Ubuntu when developing apps? Are they using POSIX libraries or using some kind of wrappers through Glib (or something else)?
I got to the point where I can display widgets/dialogs (through Gtkmm) and now I wanna learn using Files. Any link or hint would be appreciated..

[LaRoza]

Look at my wiki for learning C++.

(Specifically, look into iostream and fstream)

[xlinuks]

Thanks...
I found
http://www.gnu.org/software/libc/manual/html_node/File-System-Interface.html
For instance, it turns out that finding out the current dir is as easy as


ustring sCurrentDir = getcwd( 0, 0 );

So far "Glib" seems to be easier than Java! Cool!

[Shin_Gouki2501]

never had problems with Javas Filestream and getPath() or getAbsolutePath()...

[xlinuks]

getPath & getAbsolutePath just get the path of _a_ dir, while I was talking about the current dir.
The System.getProperty( "user.dir" ) doesn't always work as one might wish.
When your app is a jar you actually have troubles determining the current dir, I found the solution to this issue not so long ago, which is pretty weird, you even have to take care of the OS and the file encoding, the only robust hand-coded implementation I did is this:


URL url = thisClass.getProtectionDomain().getCodeSource().ge tLocation();
boolean isWindows = System.getProperty( "os.name" ).toLowerCase().indexOf( "windows" ) > -1;
try {
String sPath = url.getPath();
if( isWindows ) {
sPath = URLDecoder.decode( sPath, "UTF8" );
} else {
sPath = URLDecoder.decode( sPath, System.getProperty( "file.encoding" ) );
}
File f = new File( sPath );
if( !f.exists() ) {
Log.tell( "file doesn't exist: " + f.getPath() );
return null;
}

if( !f.isDirectory() ) { //then it's the .jar file and we need to get it's parent file
parentDir = f.getParentFile();
} else {
parentDir = f;
}
} catch( Exception exc ) {
report( exc );
}

I wouln't call it a trivial solution..
Now compare it to the solution in Glib :)

[Shin_Gouki2501]

you are my hero,

i noticed with the other project that you tend to use strange or more complicated solutions that actually needed:
http://www.exampledepot.com/egs/java.io/CurDir.html

;)

[xlinuks]

Please read my last post :) You didn't read it carefully, did you :)
If you're an experienced Java Developer you should understand why
http://www.exampledepot.com/egs/java.io/CurDir.html
doesn't always work.

[Shin_Gouki2501]

well there are dozen of options to solve a single problem. So the scope or the factors which determine which solution to choose differ a lot.

since i don't know your problem or more your desired solution and towards which domain u works its hard to tell. Buts its alright. Good luck with glib and C++.