File Search User-Defined Function (UDF) Example

• Microsoft Visual FoxPro for Windows, version 3.0
• Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, 2.5a, 2.5b, 2.6
• Microsoft FoxPro for Windows, versions 2.5, 2.5a, 2.5b, 2.6

SUMMARY

The FileFind() user-defined function (UDF), shown below, uses the ADIR() function to locate a file starting from a particular location on the hard disk drive.

MORE INFORMATION

   PROCEDURE FILEFIND
   * WARNING: If the user has a directory structure 32+ levels deep,
   * this program will crash.
   * This procedure will recursively search a specified directory and
   * its subdirectories for a particular file and if found return the
   * location from the root directory. If the file is not found, the
   * message "FILE NOT FOUND!" will be displayed. Wildcard characters
   * are not supported.
   * Example of how to call this function is :
   * TempVariable=FileFild("Customer.dbf","C:")

   PARAMETER FILE, CUR_DIR
   filefound = " "
   IF RIGHT((cur_dir),1) = "\"
        cur_dir=substr(cur_dir,1,len(cur_dir)-1)
   ENDIF
   =filesrch(file,cur_dir)
   IF EMPTY(filefound)
        filefound = "FILE NOT FOUND!"
   ENDIF
   RETURN UPPER(filefound)

   FUNCTION FILESRCH
   *
   * This is the recursive part of the program. This function will
   * search the specified directory and call itself again if needed to
   * search a subdirectory.

   PARAMETER FILENAME, CURDIR
   PRIVATE filename, curdir, temp_dir, i, j  && Private variables needed
   * curdir is the current directory.        && for recursion to work.
   * filename is the file being searched for.
   DIMENSION temp_dir(1,1)
   temp_dir(1,1)=" "
   =ADIR(temp_dir,curdir+"\"+FILENAME)
   IF ASCAN(temp_dir,UPPER(filename)) != 0   && Search current directory
        filefound=curdir + "\"+ UPPER(filename)
        RETURN TO filefind                  && IF file found, end program
   ENDIF
   =ADIR(temp_dir,curdir+"\*.","D")          && Get subdirectories
   IF temp_dir(1,1) != " " AND filefound =" "&& Search subdirectories
        IF temp_dir(1,1)="."                 && Look at first subdirectory
             IF ALEN(temp_dir,1)=2         && Possibly no subdirectories
                  RETURN
             ENDIF
             i=3
        ELSE
             i=1
        ENDIF
        FOR j = i TO ALEN(temp_dir,1)  && Start searching subdirectories
             curdir=curdir+"\"+temp_dir(j,1)
             =filesrch(filename,curdir)      && Recursive call
             curdir=SUBSTR(curdir,1,RAT("\",curdir)-1)
        ENDFOR
   ENDIF
   RETURN