Directory access problem...

This is a discussion on Directory access problem... within the C++ Programming forums, part of the General Programming Boards category; Ok, I believe it has something to do with the dirent.h code, but I may be mistaken. This is the ...

  1. #1
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    Nov 2005
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    673

    Directory access problem...

    Ok, I believe it has something to do with the dirent.h code, but I may be mistaken.
    This is the function,
    Code:
    void X_Crypt::PurgeReports()
    {
        DIR *d;
        dirent *dir;
    
        std::string file;
    
        d = opendir("C:\\C++Projects\\X_Crypt\\reports\\");
        if (d)
        {
            while ((dir = readdir(d)) != NULL)
            {
                file = dir->d_name;
                if ( file.substr(file.size()-4) == ".xtr" )
                {
                    file = "C:\\C++Projects\\X_Crypt\\reports\\" + file;
                    remove(file.c_str());
                }
            }
        }
        closedir(d);
    }
    and it produces this Runtime error
    Code:
    This application has requested the Runtime to terminate in an unusual way.
    I cant seem to find what the error is in the code. I am very thankful for any assistance you provide.

    [edit]
    I figured out that the error is the
    Code:
    if ( file.substr(file.length()-4) == ".xtr" )
    , but I don't see what is wrong with the code.
    Last edited by Raigne; 09-14-2007 at 02:06 AM. Reason: Found the problem but I dont know how to fix it

  2. #2
    Kernel hacker
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    Location
    Farncombe, Surrey, England
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    Quote Originally Posted by Raigne View Post
    I figured out that the error is the
    Code:
    if ( file.substr(file.length()-4) == ".xtr" )
    , but I don't see what is wrong with the code.
    What if teh length is shorter than 4 in the first place - that would cause a negative [1] substr - bad idea!

    [1] Or if the result is looked at as an unsigned number, it would be a REALLY HUGE number - not any better.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
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    thanks mat, I was thinking about it last night, and I figured out the scope is going negative for the ".", and ".." directory. wasnt thinking about it reading the directories to. Thank you for the assistance.

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