(Visual FoxPro) Multiple SendReqExec on Same Connection

Shows how to execute a series of commands on an SSH server and retrieve each command's output (using SendReqExec). Each call to SendReqExec requires its own logical channel. This is not a separate SSH connection -- it's simply a new session channel on the existing SSH connection.

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LOCAL loSsh
LOCAL lcHostname
LOCAL lnPort
LOCAL lnSuccess
LOCAL lnChannelNum
LOCAL lcCmd
LOCAL lnPollTimeoutMs
LOCAL n
LOCAL lcCmdOutput

* This example assumes the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Ssh')
loSsh = CreateObject('Chilkat.Ssh')

* Hostname may be an IP address or domain:
lcHostname = "172.16.16.46"
lnPort = 22

lnSuccess = loSsh.Connect(lcHostname,lnPort)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* If receiving output from a command stalls for more than 5 seconds, then stop waiting.
loSsh.IdleTimeoutMs = 5000

* Authenticate using login/password:
lnSuccess = loSsh.AuthenticatePw("myLogin","myPassword")
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Open a session channel.  (It is possible to have multiple
* session channels open simultaneously.)
lnChannelNum = loSsh.OpenSessionChannel()
IF (lnChannelNum < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Request a directory listing on the remote server:
* If your server is Linux/UNIX, change the string from "dir" to "ls"
* Note: Some SSH servers require a CRLF instead of a bare-LF
lcCmd = "ls -al" + CHR(10)
lnSuccess = loSsh.SendReqExec(lnChannelNum,lcCmd)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Read whatever output may already be available on the
* SSH connection.  ChannelReadAndPoll returns the number of bytes
* that are available in the channel's internal buffer that
* are ready to be "picked up" by calling GetReceivedText
* or GetReceivedData.
* A return value of -1 indicates failure.
* A return value of -2 indicates a failure via timeout.

* The ChannelReadAndPoll method waits
* for data to arrive on the connection usingi the IdleTimeoutMs
* property setting.  Once the first data arrives, it continues
* reading but instead uses the pollTimeoutMs passed in the 2nd argument:
* A return value of -2 indicates a timeout where no data is received.
lnPollTimeoutMs = 2000
n = loSsh.ChannelReadAndPoll(lnChannelNum,lnPollTimeoutMs)
IF (n < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Close the channel:
lnSuccess = loSsh.ChannelSendClose(lnChannelNum)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Perhaps we did not receive all of the commands output.
* To make sure,  call ChannelReceiveToClose to accumulate any remaining
* output until the server's corresponding "channel close" is received.
lnSuccess = loSsh.ChannelReceiveToClose(lnChannelNum)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Get the accumulated output of the command:

lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Display the remote shell's command output:
? lcCmdOutput
? "----"

* -----------------------------------------------------------------
* Now for the 2nd SendReqExe (on the same connection,
* but on a separate logical channel).
* -----------------------------------------------------------------

lnChannelNum = loSsh.OpenSessionChannel()
IF (lnChannelNum < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lcCmd = "nslookup chilkatsoft.com" + CHR(10)
lnSuccess = loSsh.SendReqExec(lnChannelNum,lcCmd)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lnPollTimeoutMs = 2000
n = loSsh.ChannelReadAndPoll(lnChannelNum,lnPollTimeoutMs)
IF (n < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lnSuccess = loSsh.ChannelSendClose(lnChannelNum)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lnSuccess = loSsh.ChannelReceiveToClose(lnChannelNum)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

? lcCmdOutput

RELEASE loSsh