?
Solved

Relative paths in C++

Posted on 2004-08-02
11
Medium Priority
?
665 Views
Last Modified: 2008-01-09
I have a program that uses relative file paths (ie. ifstream infile("clients.txt");) to assume that you can find the file in the same directory as the .EXE.

However, it does not read the file as specified in ifstream infile("clients.txt");. Putting the literal path (C:\\C++\\clients.txt) however, does work. Why is this, and how can I get it so it takes the relative path, so I can move the program around without changing the code each time?
0
Comment
Question by:Tabris42
  • 7
  • 4
11 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699333
Are you running the application from inside your compiler IDE?
Try to launch your app from command prompt or file explorer.
0
 

Author Comment

by:Tabris42
ID: 11699380
Good point, and I was excited to try that, but disappointed to find it still didn't work the same. :P
0
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 1000 total points
ID: 11699432
Try to obtain your .exe filepath:

          char path[MAX_PATH+1] ;
          GetModuleFileName( NULL, path, MAX_PATH);

          char *slashPos = strrchr(path, '\\') ;
          if (slashPos)
               *slashPos = 0;   // trim filename, leave only path

Then you can use:
          SetCurrentDirectory(path);

0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699445
Beside your problem, when you run from Visual C++ IDE, current directory is your project directory.
Silly question: Are you sure you are generating your .exe file in C:\\C++   ? Check date and time.
0
 

Author Comment

by:Tabris42
ID: 11699482
That's what I thought. I'm actually using Dev C++, not Visual C++. I'm unsure of how to implement the code you've posted?
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699523
If you are working in Windows environment, my code should work because GetModuleFileName and SetCurrentDirectory are both WinAPI functions, not related to Visual C++.
0
 

Author Comment

by:Tabris42
ID: 11699607
Ok, the code compiles correctly.. but how would i use it to make my example above look for clients.txt in the program directory?
This seems a little needlessly complex.
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699650
This must be made only once when you start your app, then every time you try to open a file, it will be made in the current directory, even you can encapsule it in a function you can invoke from main() function at the beginning of your program.
0
 

Author Comment

by:Tabris42
ID: 11699667
Ahh, that works well. Thank you!
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699674
Something like:

void InitDirectory()
{
          char path[MAX_PATH+1] ;
          GetModuleFileName( NULL, path, MAX_PATH);

          char *slashPos = strrchr(path, '\\') ;
          if (slashPos)
               *slashPos = 0;   // trim filename, leave only path

          SetCurrentDirectory(path);
}

Then invoke this function at the first line of your main or WinMain function.
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11699677
Oops! You won me!
thanks for the points.
0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

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

Unlike C#, C++ doesn't have native support for sealing classes (so they cannot be sub-classed). At the cost of a virtual base class pointer it is possible to implement a pseudo sealing mechanism The trick is to virtually inherit from a base class…
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. …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

609 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