在rexx中使用ftp有三种方法：
第一种是使用compound variable执行
第二种是使用stack执行
第二种是使用FTPAPI执行
下面就分别说一下这两种方法是如何实现的。
第一种
把要执行的ftp命令依次赋值给compound variable。具体例子如下：
"ALLOC F(FTPLOG) DS('C210408.FTP.LOG') OLD REUSE"
"ALLOC F(INPUT) UNIT(VIO) LRECL(80) SPACE(1) TRACKS RECFM(F B)"
"ALLOC F(OUTPUT) UNIT(VIO) LRECL(121) SPACE(1 10) CYLINDERS RECFM(V B)"
hostname = 'server ip'
input.1 = 'user pwd'
input.2 = 'bin'
input.3 = "get ptrlib/abc 'c210408.data.input' (replace"
input.4 = 'QUIT'
"EXECIO * DISKW INPUT (STEM INPUT. FINIS"
"FTP" hostname "(EXIT"
"EXECIO * DISKR OUTPUT (STEM OUTPUT. FINIS"
"EXECIO * DISKW FTPLOG (STEM OUTPUT. FINIS"
"FREE F(INPUT OUTPUT FTPLOG)"
此例子是把AS/400的pf数据复制到dataset里。并且把ftp的log写到C210408.FTP.LOG这个dataset。
第二种
使用stack和compound variable类似，具体例子如下：
"ALLOC F(FTPLOG) DS('C210408.FTP.LOG') OLD REUSE"
"ALLOC F(OUTPUT) UNIT(VIO) LRECL(121) SPACE(1 10) CYLINDERS RECFM(V B)"
hostname = 'server ip'
"newstack"
queue 'user'
queue 'pwd'
queue 'bin'
queue "get ptrlib/custom 'c210408.data.input' (replace"
queue 'QUIT'
"FTP" hostname "(EXIT"
"delstack"
"EXECIO * DISKR OUTPUT (FINIS STEM FTPO."
"EXECIO * DISKW FTPLOG (STEM FTPO. FINIS"
"FREE F(OUTPUT FTPLOG)"
第三种
在z/OS上ibm提供了ftpapi，我们可以用ftpapi来执行我们要的ftp命令。在网上可以搜索到例子，具体例子如下：
/* REXX */
/********************************************************************/
* Descriptive Name: REXX FTP Client API Sample */
/* */
/* */
/* Function: Sample FTP Client API for REXX language */
/* */
/* This sample does a directory list of the */
/* home directory. For a z/OS FTP server, this */
/* may be the the user's home directory in HFS */
/* or the user high level qualifier, depending */
/* on whether the server FTP.DATA has */
/* STARTDIRECTORY set to HFS or MVS™. */
/* */
/* It then does a directory search of /tmp and */
/* finds the largest file in /tmp. */
/* */
/********************************************************************/
/*********************************************************************/
/* Setup the constants for the FTPAPI invocations */
/*********************************************************************/
TRACEID = 'PAZ'
USER_COMMAND = 'user user1'
PASS_COMMAND = 'pass tcpsup'
DIR_COMMAND = 'dir *'
TMP_COMMAND = 'DIR /tmp/*'
OPENSTRING = '-w 300 127.0.0.1 21 '
ENVVAR1 = '_CEE_DMPTARG=/tmp'
ENVVAR2 = '_BPX_JOBNAME=MYJOB'
/*********************************************************************/
/* Initialize the FCAI stem. */
/*********************************************************************/
if ftpapi('fcai.', 'create', TRACEID) < 0 then do
Say 'Unable to create the FCAI'
exit -1
end
/*********************************************************************/
/* Turn on tracing of the Client API tracing. This is a different */
/* trace from the REXX FTP Client API trace and is always written */
/* to SYSOUT. */
/*********************************************************************/
if ftpapi('fcai.', 'set_trace', 'ON') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Initialize the FTP client environment and open a connection */
/* to the FTP server using the OPENSTRING. Two environment */
/* variables are also provided to the FTP Client API to be used */
/* when intitializing its environment. */
/*********************************************************************/
if ftpapi('fcai.', 'init', OPENSTRING, ENVVAR1, ENVVAR2) < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Sign on */
/* Enter the userid. */
/*********************************************************************/
if ftpapi('fcai.', 'scmd', USER_COMMAND, 'W') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* If the FTP server prompts for a password, provide one. In some */
/* instances, an FTP server may not prompt for a password (e.g., */
/* when an anonymous user logs on to some FTP servers). */
/*********************************************************************/
if fcai.FCAI_Result = FCAI_RESULT_PROMPTPASS then do
if ftpapi('fcai.', 'scmd', PASS_COMMAND, 'W') < 0 then do
call ftp_error 'fcai.'
end
end
/*********************************************************************/
/* List directory entries */
/* Enter a subcommand DIR_COMMAND to retrieve a listing of all files */
/* in the directory. The REXX program requests the FTP client */
/* API wait for the subcommand to complete before returning. */
/*********************************************************************/
if ftpapi('fcai.', 'scmd', DIR_COMMAND, 'W') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Fetch the lines returned by the DIR subcommand. */
/*********************************************************************/
if ftpapi('fcai.', 'getl_copy', 'lines.', 'L') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Display the results of the output. lines.0 contains the total */
/* number of lines returned, while lines.1...lines.n contains the */
/* output for each individual line. */
/*********************************************************************/
say 'Directory output is:'
do i=1 to lines.0
say ' 'lines.i
end
/*********************************************************************/
/* Find the largest file in /tmp */
/* Do a DIR of /tmp in non-wait mode, find the largest file in the */
/* directory. The FTP client will return immediately, even if */
/* the subcommand has not completed. The POLL request is then */
/* used to determine when the subcommand has completed. */
/*********************************************************************/
if ftpapi('fcai.', 'scmd', TMP_COMMAND, 'N') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Poll to see when the DIR is done. */
/* */
/* If running under USS/OMVS, make sure that syscalls are not */
/* enabled prior to making the first CREATE request. Enabling */
/* syscalls makes the USS/OMVS environment variables no longer */
/* available to the REXX program, so the REXX FTP Client API would */
/* be unable to read the FTP_REXX_TRACE_FILE environment variable */
/* (if provided) once syscalls are enabled. */
/*********************************************************************/
call syscalls "ON" /* Enable SYSCALLS */
if ftpapi('fcai.', 'poll') < 0 then do
call ftp_error 'fcai.'
end
do while fcai.fcai_result = FCAI_RESULT_INPROGRESS
address syscall 'sleep 20'
if ftpapi('fcai.', 'poll') < 0 then do
call ftp_error 'fcai.'
end
end
/*********************************************************************/
/* find the largest file */
/* Each line of output of a DIR command appears as: */
/* drwxrwxrwx cnt userid groupid size date file */
/*********************************************************************/
largest_file = ""
largest_file_size = 0
if ftpapi('fcai.', 'getl_find', 'lines.', 'L', 'F') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Continue to search until there are no more lines. When there */
/* is no matching line, the REXX FTP Client API returns a result */
/* of FCAI_RESULT_NOMATCH and sets lines.0 to 0. */
/*********************************************************************/
do until lines.0 = 0
parse var lines.1 dirinfo count userid groupid size date file .
if size > largest_file_size then do
largest_file = lines.1
largest_file_size = size
end
if ftpapi('fcai.', 'getl_find', 'lines.', 'L', 'N') < 0 then do
call ftp_error 'fcai.'
end
end
if largest_file <> "" then do
say 'Characteristics of the largest file are'
say ' 'largest_file
end
else do
say 'No files found'
end
/*********************************************************************/
/* Enter the QUIT subcommand and terminate the connection. */
/* It's better to enter the QUIT subcommand before entering the */
/* ftpapi('term') command. In this way, any error traces can be */
/* displayed. */
/*********************************************************************/
if ftpapi('fcai.', 'scmd', 'QUIT', 'W') < 0 then do
call ftp_error 'fcai.'
end
/*********************************************************************/
/* Enter the TERM request to close this instance of the FTP client */
/* API. */
/*********************************************************************/
if ftpapi('fcai.', 'term') < 0 then do
Say "Unexpected error on ftpapi('term')"
exit -1
end
exit
第三种例子和前两种不同的是不能输入ftp log到指定的dataset中（不知道有没有，我没有找到，呵呵）。
不过可以得到trace信息。操作步骤如下：
首先要执行如下的ftpapi，这样才能得到trace信息。
if ftpapi('fcai.', 'set_trace', 'ON') < 0 then do
call ftp_error 'fcai.'
end
其次，默认的情况会产生一个名叫FTPRXTRC的ddname中，但需要alloc一个具体的dataset，操作如下：
ALLOC FILE(FTPRXTRC) DA(FTP.TRACE.OUT) NEW LRECL(80) RECFM(F B) TRACK SPACE(10 10)
更多关于ftpapi的信息请参照《IP Programmer’s Guide and Reference》书号为SC31-8787-12
欢迎拍砖。。。。
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