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Visual FoxPro Examples

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(Visual FoxPro) SSH Parallel Remote Commands on Single Server

Shows how to execute multiple commands in parallel on a single SSH server and retrieve the command output for each.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loSsh
LOCAL lnPort
LOCAL lnSuccess
LOCAL lnChannel1
LOCAL lnChannel2
LOCAL lnChannel3
LOCAL lnPollTimeoutMs
LOCAL lnNumFinished
LOCAL lnChannel

*  This example assumes Chilkat SSH/SFTP to have been previously unlocked.
*  See Unlock SSH for sample code.

loSsh = CreateObject('Chilkat_9_5_0.Ssh')

lnPort = 22
lnSuccess = loSsh.Connect("the-ssh-server.com",lnPort)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Authenticate using login/password:
lnSuccess = loSsh.AuthenticatePw("theSshLogin","theSshPassword")
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Start several commands on the server.
lnChannel1 = loSsh.QuickCmdSend("df")
IF (lnChannel1 < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lnChannel2 = loSsh.QuickCmdSend("date")
IF (lnChannel2 < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lnChannel3 = loSsh.QuickCmdSend("echo hello world")
IF (lnChannel3 < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Now collect the results of each command.
lnPollTimeoutMs = 50
lnNumFinished = 0
DO WHILE lnNumFinished < 3
    *  Check to see if anything has finished.
    *  QuickCmdCheck returns -1 if there are no errors and nothing else finished
    *  QuickCmdCheck returns -2 if there was an error (such as a lost connection)
    *  QuickCmdCheck returns a channel number if a channel finished.
    lnChannel = loSsh.QuickCmdCheck(lnPollTimeoutMs)
    IF (lnChannel = -2) THEN
        ? loSsh.LastErrorText
        RELEASE loSsh
        CANCEL
    ENDIF

    IF (lnChannel >= 0) THEN
        ? "---- channel " + STR(lnChannel) + " finished ----"
        ? loSsh.GetReceivedText(lnChannel,"ansi")
        lnNumFinished = lnNumFinished + 1
    ENDIF

ENDDO

*  --------------
*  Sample output:

* 	---- channel 105 finished ----
* 	hello world
* 
* 	---- channel 104 finished ----
* 	Thu Dec 22 17:43:58 CST 2016
* 
* 	---- channel 103 finished ----
* 	Filesystem    512-blocks      Used  Available Capacity  iused     ifree %iused  Mounted on
* 	/dev/disk2    2176716032 265739728 1910464304    13% 33281464 238808038   12%   /
* 	devfs                382       382          0   100%      662         0  100%   /dev
* 	map -hosts             0         0          0   100%        0         0  100%   /net
* 	map auto_home          0         0          0   100%        0         0  100%   /home
* 	/dev/disk3s2      374668    374668          0   100%    93665         0  100%   /Volumes/Google Chrome

RELEASE loSsh


 

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