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Hi Bob,
On Sat, 27 May 2000, Marion, Bob wrote:
> I'm trying to programmatically generate a list of objects in an IFS
> directory. I'm trying to use opendir() and readdir(), but since I am not a
> C programmer I was not able to understand how to define these API's
> parameters in RPG. Could anyone give me sample PR definitions for these
> procedures? A little guidance on how to use them will be greatly
> appreciated also.
>
> TIA
>
> Bob Marion
>
Sure, here's an example that just uses the DSPLY op-code
to list each object in a directory in the IFS...
Have Fun!
------------------------------cut here-----------------------------------
** This is a simple test program, to demonstrate reading a directory
** using the IFS API with RPG IV.
** <<CHANGE THIS!!>>
D PATHTOLIST C CONST('/QDLS/MLHELP/')
D**********************************************************************
D*
D* Directory Entry Structure (dirent)
D*
D* struct dirent {
D* char d_reserved1[16]; /* Reserved */
D* unsigned int d_reserved2; /* Reserved */
D* ino_t d_fileno; /* The file number of the file */
D* unsigned int d_reclen; /* Length of this directory entry
D* * in bytes */
D* int d_reserved3; /* Reserved */
D* char d_reserved4[8]; /* Reserved */
D* qlg_nls_t d_nlsinfo; /* National Language Information
D* * about d_name */
D* unsigned int d_namelen; /* Length of the name, in bytes
D* * excluding NULL terminator */
D* char d_name[_QP0L_DIR_NAME]; /* Name...null terminated */
D*
D* };
D*
D p_dirent s *
D dirent ds based(p_dirent)
D d_reserv1 16A
D d_reserv2 10U 0
D d_fileno 10U 0
D d_reclen 10U 0
D d_reserv3 10I 0
D d_reserv4 8A
D d_nlsinfo 12A
D nls_ccsid 10I 0 OVERLAY(d_nlsinfo:1)
D nls_cntry 2A OVERLAY(d_nlsinfo:5)
D nls_lang 3A OVERLAY(d_nlsinfo:7)
D nls_reserv 3A OVERLAY(d_nlsinfo:10)
D d_namelen 10U 0
D d_name 640A
D*--------------------------------------------------------------------
D* Open a Directory
D*
D* DIR *opendir(const char *dirname)
D*
D* NOTE: We are at V3R2, so we can't use OPTIONS(*STRING) yet :(
D*--------------------------------------------------------------------
D opendir PR * EXTPROC('opendir')
D dirname * VALUE
D*--------------------------------------------------------------------
D* Read Directory Entry
D*
D* struct dirent *readdir(DIR *dirp)
D*
D* NOTE: We are at V3R2, so we can't use OPTIONS(*STRING) yet :(
D*--------------------------------------------------------------------
D readdir PR * EXTPROC('readdir')
D dirp * VALUE
D* a few local variables...
D dh S *
D PathName S 256A
D Name S 256A
C* Step1: Open up the directory.
c eval PathName= PATHTOLIST + x'00'
C eval dh = opendir(%addr(PathName))
C if dh = *NULL
c eval Msg = 'Cant open directory'
c dsply Msg 50
c eval *INLR = *ON
c Return
c endif
C* Step2: Read each entry from the directory (in a loop)
c eval p_dirent = readdir(dh)
c dow p_dirent <> *NULL
C* FIXME: This code can only handle file/dir names under 256 bytes long
C* because thats the size of "Name"
c if d_namelen < 256
c eval Name = %subst(d_name:1:d_namelen)
c movel Name dsply_me 52
c dsply_me dsply
c endif
c eval p_dirent = readdir(dh)
c enddo
C* Step3: End Program
c dsply Pause 1
c eval *inlr = *On
------------------------------cut here-----------------------------------
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