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File Streams

File Streams

File Streams

How do i check in C++ whether a directory exists or not?
If exists does it have write permissions?
How do I do the above checks? Some sample code will helpful

Thanx in Advance

RE: File Streams

Which compiler are you using? BCB has a library called FileCtrl which has a function called DirectoryExists. I assume Borland C++ 5.5 has it, too.

James P. Cottingham

RE: File Streams

See if you have the io.h file in your libraries. In this is a function called access. It take the form of int access(const char *filename, intamode). Amode can be one of the following:
06 - Check for read and write permission
04 - Check for read permission
02 - Check for write permission
01 - (ignored but supposed to be for execute)
00 - Check for existence of file.

If the filename is a directory name, access simply returns whether the directory exists or not.

The integer returned can be 0 if the requested amode is true, or -1 for false. The following example comes from my Borland C++ 5.02 help file.

 #include <stdio.h>
 #include <io.h>

 int file_exists(char *filename);

 int main(void)
    printf("Does NOTEXIST.FIL exist: %s\n",
      file_exists("NOTEXISTS.FIL") ? "YES" : "NO");
    return 0;

 int file_exists(char *filename)
   return (access(filename, 0) == 0);

Sorry it took so long.

James P. Cottingham

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