C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Disk/directory access: Least unportable method?          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Rune Allnor Guest Posted: Sun May 20, 2007 12:26 am    Post subject: Disk/directory access: Least unportable method? Hi all. My application needs to work on directory structures with several levels. I do my work on a Win32 system, but I would like to keep my options open for porting to other systems. The first concern is to start from a given 'root' directory and scan subdirectories recursively, the second is to obtain lists of files with sizes which are stored in any one directory. Basically I need to do in C++ code what I used to do with 'ls' on the UNIX command line. In my Win32 compiler suite I have found 'dirent.h,' which seems to contain some functions which might become useful. According to the documentation those routines are standard for Win23 and POSIX, but not ANSI C/C++. In the past I have made an effort to comply with ANSI or ISO standards wherever possible, in order to maintain code portability between platforms. What are the best ways to obtain the required disk access functionality without obstructing future porting of code? The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler, and I need to use my commercial compiler in order to get acces to COM automation. Rune -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Denise Kleingeist Guest Posted: Sun May 20, 2007 6:57 am    Post subject: Re: Disk/directory access: Least unportable method? Hello Rune! On May 20, 2:26 am, Rune Allnor <all...@tele.ntnu.no> wrote: Quote: My application needs to work on directory structures with several levels. I do my work on a Win32 system, but I would like to keep my options open for porting to other systems. Use the file system library from TR1: this will become part of the next revision of the C++ standard. If you can't afford an implementation of TR1 now, you can use Boost's file system library (although I would think that it would be time to look for a new job because Dinkumware's implementation isn't that expensive): the TR1 version is based on the Boost one and it should be a matter of redefining a namespace alias to obtain the one shipping with your compile once it becomes available. Good luck, Denise -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top myork Guest Posted: Sun May 20, 2007 6:59 am    Post subject: Re: Disk/directory access: Least unportable method? boost: www.boost.org Boost has a file system library: http://www.boost.org/libs/filesystem/doc/index.htm Though technically boost is not a standard, it is used by the C++ as a breeding place for new concepts that people want to be included in the standard. And several people on the C++ standards committee are active members of boost. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Markus Schoder Guest Posted: Sun May 20, 2007 6:59 am    Post subject: Re: Disk/directory access: Least unportable method? On Sat, 19 May 2007 18:26:38 -0600, Rune Allnor wrote: Quote: My application needs to work on directory structures with several levels. I do my work on a Win32 system, but I would like to keep my options open for porting to other systems. On http://www.boost.org look for the boost filesystem library. Quote: What are the best ways to obtain the required disk access functionality without obstructing future porting of code? The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler, and I need to use my commercial compiler in order to get acces to COM automation. There is a project that adds Visual Studio support to the free edition Qt library. Google for it. -- Markus Schoder [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Marcus Kwok Guest Posted: Sun May 20, 2007 6:59 am    Post subject: Re: Disk/directory access: Least unportable method? Rune Allnor <allnor (AT) tele (DOT) ntnu.no> wrote: Quote: My application needs to work on directory structures with several levels. I do my work on a Win32 system, but I would like to keep my options open for porting to other systems. The first concern is to start from a given 'root' directory and scan subdirectories recursively, the second is to obtain lists of files with sizes which are stored in any one directory. Basically I need to do in C++ code what I used to do with 'ls' on the UNIX command line. In my Win32 compiler suite I have found 'dirent.h,' which seems to contain some functions which might become useful. According to the documentation those routines are standard for Win23 and POSIX, but not ANSI C/C++. In the past I have made an effort to comply with ANSI or ISO standards wherever possible, in order to maintain code portability between platforms. What are the best ways to obtain the required disk access functionality without obstructing future porting of code? The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler, and I need to use my commercial compiler in order to get acces to COM automation. Boost has a filesystem library that might be useful for what you need. http://www.boost.org/ -- Marcus Kwok Replace 'invalid' with 'net' to reply [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Mathias Gaunard Guest Posted: Sun May 20, 2007 7:00 am    Post subject: Re: Disk/directory access: Least unportable method? On May 20, 2:26 am, Rune Allnor <all...@tele.ntnu.no> wrote: Quote: What are the best ways to obtain the required disk access functionality without obstructing future porting of code? Use a library such as boost filesystem. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Thomas J. Gritzan Guest Posted: Sun May 20, 2007 7:00 am    Post subject: Re: Disk/directory access: Least unportable method? Rune Allnor wrote: Quote: My application needs to work on directory structures with several levels. I do my work on a Win32 system, but I would like to keep my options open for porting to other systems. The first concern is to start from a given 'root' directory and scan subdirectories recursively, the second is to obtain lists of files with sizes which are stored in any one directory. Basically I need to do in C++ code what I used to do with 'ls' on the UNIX command line. In my Win32 compiler suite I have found 'dirent.h,' which seems to contain some functions which might become useful. [...] Since there's no way in standard C++ to do that, you could use the POSIX library or I suggest boost.filesystem which has good changes to make it into one of the next C++ standards. -- Thomas http://www.netmeister.org/news/learn2quote.html [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top John Moeller Guest Posted: Sun May 20, 2007 7:00 am    Post subject: Re: Disk/directory access: Least unportable method? Rune Allnor wrote: Quote: ... The first concern is to start from a given 'root' directory and scan subdirectories recursively, the second is to obtain lists of files with sizes which are stored in any one directory. Basically I need to do in C++ code what I used to do with 'ls' on the UNIX command line. ... What are the best ways to obtain the required disk access functionality without obstructing future porting of code? The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler, and I need to use my commercial compiler in order to get acces to COM automation. Qt is way too heavy for what you want anyway. Have you tried Boost.Filesystem? http://www.boost.org/libs/filesystem/doc/index.htm I haven't used it yet, but I looked into it. It should serve your needs. Boost is also committed to cross-platform compatibility. -- John Moeller fishcorn (AT) gmail (DOT) com [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Carl Barron Guest Posted: Sun May 20, 2007 7:00 am    Post subject: Re: Disk/directory access: Least unportable method? Rune Allnor <allnor (AT) tele (DOT) ntnu.no> wrote: Quote: In my Win32 compiler suite I have found 'dirent.h,' which seems to contain some functions which might become useful. According to the documentation those routines are standard for Win23 and POSIX, but not ANSI C/C++. In the past I have made an effort to comply with ANSI or ISO standards wherever possible, in order to maintain code portability between platforms. Thw ansi C or C++ standard does not have a concept of directory of files, but most unix's provide dirent.h . If a platform does not have a dirent.h , it is fairly easy to implement if the os supports diretories, and if it does not your application won't work. [most mainstream os'es support directories, but some 'old ones' don't] My advice is use dirent.h's portable functions, with the C API as then you are almost certain to have no porting problems, except some 'wierd' system without directories. Stick to opendir(), readdir(), closedir() as some implementations don't like seekdir(),telldir(),rewinddir(), if reasonable. Examine the POSIX docs as these are probably what a non POSIX system will emulate. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Pete Becker Guest Posted: Sun May 20, 2007 3:34 pm    Post subject: Re: Disk/directory access: Least unportable method? Denise Kleingeist wrote: Quote: Use the file system library from TR1: this will become part of the next revision of the C++ standard. The file system library isn't in TR1. It's in TR2 (or maybe just on the list to be added to TR2), which has just barely gotten started. No document yet. It's not currently on the list for the next standard. So Boost is, indeed, your best bet: that's where it came from. -- -- Pete Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The Standard C++ Library Extensions: a Tutorial and Reference." (www.petebecker.com/tr1book) [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top sss.zhou@gmail.com Guest Posted: Sun May 20, 2007 3:35 pm    Post subject: Re: Disk/directory access: Least unportable method? On May 20, 8:26 am, Rune Allnor <all...@tele.ntnu.no> wrote: Quote: The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler, and I need to use my commercial compiler in order to get acces to COM automation. Qt can work successfully with VC6 or VS2003 and QFile/QDir can be used free. If you don't have Ms complier, I learn that Eciplse + CDT(C++ Development Toolkit) is able to compliee Qt codes. Becuase I use the "Qt4 commercial version" + VS2003 all the while, so I am sorry for can not provide more advice abou it. I think Qt library is a good way when C++ doesn't contain the standard of file because Qt library teams will maintains their codes for different OS. QDir also has very convenience functions for your requirements. (Just call QDir::entryInfoList() will get all you want.) Sorry for my bad english, I wish you can understand. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Mathias Gaunard Guest Posted: Sun May 20, 2007 11:44 pm    Post subject: Re: Disk/directory access: Least unportable method? On May 20, 2:26 am, Rune Allnor <all...@tele.ntnu.no> wrote: Quote: The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler How is it hardwired? Qt is released under the GPL. Nothing prevents you from using it with a commercial compiler and use it for commercial products. However, that means that if you want to distribute your application, it will have to be under the terms of a GPL-compatible license. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Rune Allnor Guest Posted: Mon May 21, 2007 4:56 am    Post subject: Re: Disk/directory access: Least unportable method? On 21 May, 01:44, Mathias Gaunard <loufo...@gmail.com> wrote: Quote: On May 20, 2:26 am, Rune Allnor <all...@tele.ntnu.no> wrote: The Qt library is not an option, since I can only afford the OpenSource edition, which is hard-wired to some weird (what Win32 is concerned) non-commercial compiler How is it hardwired? The version I have was distributed on a CD with the Qt4 book by Blanchette(sp?). The CD contained the MinGW (?) compiler along with all the libraries on a binary format which was ported more or less dierctly from UNIX. Maybe it is straight-forward to convert those binaries to a format which is compatible with standard Win32 DLLs, but I don't know how to do that. Nor am I very interested in learning it, for that matter. Rune -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Mathias Gaunard Guest Posted: Tue May 22, 2007 12:11 am    Post subject: Re: Disk/directory access: Least unportable method? On May 21, 6:56 am, Rune Allnor <all...@tele.ntnu.no> wrote: Quote: The version I have was distributed on a CD with the Qt4 book by Blanchette(sp?). The CD contained the MinGW (?) compiler along with all the libraries on a binary format which was ported more or less dierctly from UNIX. MinGW is GCC for Windows. For marketing purposes, Trolltech doesn't distribute a precompiled version of Qt for Visual C++. But you've got the source. Just compile and set up the environment yourself for the compiler of your choice. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ Language (Moderated) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.