Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Cannot open long file path

Posted on 2013-01-27
7
Medium Priority
?
730 Views
Last Modified: 2013-01-28
Hello Experts,

I cannot open long file path with _wfopen_s() and FindFirstFile().

A long file path means "C:\aaaaaaa....\bbbbb....txt"(260 bytes).

Windows 7 32bit, C++Builder XE2

Please advice.
0
Comment
Question by:NobMiwa
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 38825834
in C++ "\a" is an alert character, and "\b" is a backspace character.
Did you mean  "C:\\aaaaaaa....\\bbbbb....txt"?
0
 
LVL 31

Accepted Solution

by:
Zoppo earned 2000 total points
ID: 38825837
Hi MobMiwa,

take a look at the section Maximum Path Length Limitation in this article: http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx

There you can find the maximum length for a path is 260 incluind drive letter and terminating NUL character.

To use longer paths you have to use the UNICODE versions of the functions and prefix the path with a \\?\. According to ozo's comment you path should then look like i.e. this: "\\\\?\\C:\\aaaaaaa....\\bbbbb....txt".

Hope that helps,

ZOPPO
0
 

Author Comment

by:NobMiwa
ID: 38825838
Thank you for reply.

Yes, I mean "C:\\aaaaaaa....\\bbbbb....txt" in code.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 

Author Comment

by:NobMiwa
ID: 38825854
Thank you for reply ZOPPO.

What do you mean "UNICODE versions of the functions" ?
Can I use _wfopen_s() ? If not, how can I open and read a file ?
0
 
LVL 15

Expert Comment

by:Minh Võ Công
ID: 38825890
Yes, I mean "C:\\aaaaaaa....\\bbbbb....txt" in code -> you can try the full path file, example "C\\aaaaaaaaaaaaaa\\bbbbbbbbb.txt,
you can use "C:\\aaaaaaa....\\bbbbb....txt" in console application.
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 38825914
Hm - I'm not really sure because I never used it this way, but I guess it should work with _wfopen_s since this is a wide-character version of fopen_s.

If it doesn't work you can use API functions like CreateFileW/ReadFileW/WriteFileW and FindFirstFileW/FindNextFileW/FindClose if your application doesn't use UNICODE.

ZOPPO
0
 

Author Closing Comment

by:NobMiwa
ID: 38826925
Thank you for super quick reply !
0

Featured Post

Tech or Treat!

Submit an article about your scariest tech experience—and the solution—and you’ll be automatically entered to win one of 4 fantastic tech gadgets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today, the web development industry is booming, and many people consider it to be their vocation. The question you may be asking yourself is – how do I become a web developer?
If you are a mobile app developer and especially develop hybrid mobile apps then these 4 mistakes you must avoid for hybrid app development to be the more genuine app developer.
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…
Introduction to Processes

636 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