schworak
asked on
Capturing the output of a DOS program that is launched?
Is there a way that I can start a DOS program and capture it's output so I can process it when it completes?
I am using VB6.0 SP3 and running on Windows 95/98 systems (may be on NT as well later). I need to use ShellExecute, Shell or something to execute the DOS program (got this part working) and wait for it to finish (got this working too) then read all the output it created and process it.
I know that the output can be redirected when the program is started from the command line (ie. C:\Something.exe > capture.txt) but is there a way to get this to happen when the program is started using say the SHELL command?
I am using VB6.0 SP3 and running on Windows 95/98 systems (may be on NT as well later). I need to use ShellExecute, Shell or something to execute the DOS program (got this part working) and wait for it to finish (got this working too) then read all the output it created and process it.
I know that the output can be redirected when the program is started from the command line (ie. C:\Something.exe > capture.txt) but is there a way to get this to happen when the program is started using say the SHELL command?
Which DOS commands do you want to execute ?
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ASKER
Can you tell me why that works but just doing
Shell "Ping > myfile.txt"
Doesn't work?
I faked the same type of result by creating a dummy batch file on the fly that runs the program I am after. But it seemed so bulky.
Shell "Ping > myfile.txt"
Doesn't work?
I faked the same type of result by creating a dummy batch file on the fly that runs the program I am after. But it seemed so bulky.
ASKER
Oh, I am going to leave this question open just a bit longer in case someone has another answer. If not you will get the points AMEBA.
>why that works
You are not starting normal Windows program and you need 'command.com' or other interpreter - Environ("COMSPEC")
You can find out what is 'command.com':
sCommand = "Ping "
replace with:
sCommand = "command /?"
You are not starting normal Windows program and you need 'command.com' or other interpreter - Environ("COMSPEC")
You can find out what is 'command.com':
sCommand = "Ping "
replace with:
sCommand = "command /?"
Hi schworak
Try this code.
One important thing - change property
of dummy "mybat.bat" batch file on "Exit" when finish (for Win95/98 only).
Cheers
**************************
Option Explicit
'--------------
'Wait Program Termination DLL Declarations
Declare Function OpenProcess Lib "kernel32" _
(ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, _
ByVal dwProcessId As Long) As Long
'
Declare Function WaitForSingleObject Lib "kernel32" _
(ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
'
Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'--------------------
Public Command1_Click
'
Dim sSendCommand As String
Dim sBatFilePath As String
'
sSendCommand = "xcopy test1.txt test.txt > logfile.txt"
'
sBatFilePath = App.Path & "\mybat.bat"
'
Open sBatFilePath For Output As #1
Print #1, sSendCommand
Close #1
'
Call fShellTerminated(sBatFileP
'
End Sub
Public Sub fShellTerminated(ByVal sCommand As String)
'
'Start Foreign App and Wait Termination
'
Dim hprog, hProc, RetVal As Long
Const SYNCHRONIZE = &H100000
Const INFINITE = &HFFFF
'
On Error GoTo Err_fShellTerminated
'
'Start foreign program
hprog = Shell(sCommand, vbHide) 'returns taskID
'Get process handle
hProc = OpenProcess(SYNCHRONIZE, False, hprog)
'Wait until the process terminates
If hProc <> 0 Then
RetVal = WaitForSingleObject(hProc,
CloseHandle hProc
End If
'Normal Exit
Exit Sub
'Error Handler
Err_fShellTerminated:
'--------------------
'
End Sub
Try this code.
One important thing - change property
of dummy "mybat.bat" batch file on "Exit" when finish (for Win95/98 only).
Cheers
**************************
Option Explicit
'--------------
'Wait Program Termination DLL Declarations
Declare Function OpenProcess Lib "kernel32" _
(ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, _
ByVal dwProcessId As Long) As Long
'
Declare Function WaitForSingleObject Lib "kernel32" _
(ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
'
Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'--------------------
Public Command1_Click
'
Dim sSendCommand As String
Dim sBatFilePath As String
'
sSendCommand = "xcopy test1.txt test.txt > logfile.txt"
'
sBatFilePath = App.Path & "\mybat.bat"
'
Open sBatFilePath For Output As #1
Print #1, sSendCommand
Close #1
'
Call fShellTerminated(sBatFileP
'
End Sub
Public Sub fShellTerminated(ByVal sCommand As String)
'
'Start Foreign App and Wait Termination
'
Dim hprog, hProc, RetVal As Long
Const SYNCHRONIZE = &H100000
Const INFINITE = &HFFFF
'
On Error GoTo Err_fShellTerminated
'
'Start foreign program
hprog = Shell(sCommand, vbHide) 'returns taskID
'Get process handle
hProc = OpenProcess(SYNCHRONIZE, False, hprog)
'Wait until the process terminates
If hProc <> 0 Then
RetVal = WaitForSingleObject(hProc,
CloseHandle hProc
End If
'Normal Exit
Exit Sub
'Error Handler
Err_fShellTerminated:
'--------------------
'
End Sub
ASKER
I already had the code to make me wait. I am using the Command.com /c method. Thanks though