Solved

Checking directory existance

Posted on 1998-08-28
16
412 Views
Last Modified: 2008-02-01
I want to check to see if a directory exists before using it in code.  What functions/methods are available to check a string which contains a path specification for existance?
0
Comment
Question by:cwirrgan
  • 7
  • 4
  • 3
  • +1
16 Comments
 
LVL 22

Expert Comment

by:nietod
Comment Utility
this is platform dependant.  What OS are we taling about?
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
It looks like the function access (or _access or __access etc...) will do what you want, but as nietod says, this is platform dependent.
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
If the "access" function is available, try something like the following:

if (access (PathToDirectory, 0) == 0)
{ // Do what you want if it exists
}
else
{ // Do what you want if it doesn't
}
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
According to the Visual C++ documentation, the access function is ANSI compliant, so it should work with most everything (Windows NT, 95, and 98 for sure).
0
 
LVL 2

Accepted Solution

by:
milenvk earned 20 total points
Comment Utility
If you are programming for win32 here is my own function that checks for file and directory existance:

BOOL CCMSProIEStart::FileExist(LPCSTR fileName)
{
  WIN32_FIND_DATA ffd;
  HANDLE hFF = NULL;
  if((hFF = ::FindFirstFile(fileName, &ffd)) == INVALID_HANDLE_VALUE)
    return FALSE;
  ::FindClose(hFF);
  return TRUE;
}

0
 
LVL 22

Expert Comment

by:nietod
Comment Utility
According to my documentation the functon is not a standard function, it is provided by Microsoft for windows platforms, so it won't be availalbe in non-windows programs.
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
From MS documentation:

"The Microsoft run-time library supports American National Standards Institute (ANSI) C and UNIX® C. In this book, references to UNIX include XENIX®, other UNIX-like systems, and the POSIX subsystem in Windows NT and Windows 95. The description of each run-time library routine in this book includes a compatibility section for these targets: ANSI, Windows 95 (listed as Win 95), and Windows NT (Win NT). All run-time library routines included with this product are compatible with the Win32 API."

To me that means it is Ansi complient since the function is part of the run time library.
0
 

Author Comment

by:cwirrgan
Comment Utility
The platfom is Windows NT/95
0
What Should I Do With This Threat Intelligence?

Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
milenvk - Isn't that a little overkill considering what I proposed?
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
cwirrgan - Will access work in that case?
0
 
LVL 22

Expert Comment

by:nietod
Comment Utility
thresher_shark, you have it backwards, it says

"All run-time library routines included with this product are compatible with the Win32 API"

that means that you can use any run-time library procedure from within windows.  It doesn't mean that you can use any non-standard procedure provided by Microsoft on another (non-microsoft) platform.  The access() procedure is not part of the standard run-time library.  Other libraries or platforms may not (probably will not) have it.
0
 

Author Comment

by:cwirrgan
Comment Utility
Access will work in my case.
0
 

Author Comment

by:cwirrgan
Comment Utility
Access will work in my case.
0
 
LVL 6

Expert Comment

by:thresher_shark
Comment Utility
Oh, yes you are right nietod.  Thank you for clarifying.
0
 
LVL 22

Expert Comment

by:nietod
Comment Utility
If you are going to use access(), the points really should have gone to thresher_shark, not milenvk.  If you want to use the window API directly, then the GetFileAttributes() function could be used instead of the functions that milenvk suggested.  It will be faster, shorter, and simpler.
0
 
LVL 2

Expert Comment

by:milenvk
Comment Utility
Well people, I agree with you - I just answered without reading your answers... I just had the answer regardless of whether it's good or bad... What can I do to return the points back? There's a question for thresher_shark in c++ questions worth of 20 points... I think that'll do...
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now