Run a batch program(.bat) through a Visual Basic 6.0 - batch-file

Question

I want to run a batch program(.bat) through a Visual Basic 6.0 application and also want to print the output of the batch program(.bat) in the Visual Basic 6.0 application. I want to execute the dir command in the batch file so that VB6.0 application can print the output in a text box.
VB6.0 code:
Dim com As String
Dim wshThisShell
Dim lngRet As Long
Dim strShellCommand As String
Dim strBatchPath As String
Sub C0ding()
Set wshThisShell = CreateObject("WScript.Shell")
strBatchPath = "C:\first.bat"
strShellCommand = """" & strBatchPath & """"
lngRet = wshThisShell.Run(strShellCommand, vbNormalFocus, vbTrue)
End Sub
Private Sub Command1_Click()
C0ding
End Sub
first.bat:
dir c:\
In the above example 'first.bat' is batch file and containing the 'dir c:\' command. Now VB6.0 app will run the first.bat and show the output of the 'dir c:\' command in a text box.
Please also tell me that I can achieve this requirement means can VB6.0 application regain the control from batch program(.bat)?
Please help me with this.

Answer 1

Following is solution which worked for me:
Private Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As Any, ByVal nSize As Long) As Long
Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, ByVal lpBuffer As String, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Any) As Long
Private Declare Function GetNamedPipeInfo Lib "kernel32" (ByVal hNamedPipe As Long, lType As Long, lLenOutBuf As Long, lLenInBuf As Long, lMaxInstances As Long) As Long
Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type
Private Type STARTUPINFO
cb As Long
lpReserved As Long
lpDesktop As Long
lpTitle As Long
dwX As Long
dwY As Long
dwXSize As Long
dwYSize As Long
dwXCountChars As Long
dwYCountChars As Long
dwFillAttribute As Long
dwFlags As Long
wShowWindow As Integer
cbReserved2 As Integer
lpReserved2 As Long
hStdInput As Long
hStdOutput As Long
hStdError As Long
End Type
Private Type PROCESS_INFORMATION
hProcess As Long
hThread As Long
dwProcessID As Long
dwThreadID As Long
End Type
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function CreateProcessA Lib "kernel32" (ByVal lpApplicationName As Long, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, ByVal lpEnvironment As Long, ByVal lpCurrentDirectory As Long, lpStartupInfo As Any, lpProcessInformation As Any) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'Purpose : Synchronously runs a DOS command line and returns the captured screen output.
'Inputs : sCommandLine The DOS command line to run.
' [bShowWindow] If True displays the DOS output window.
'Outputs : Returns the screen output
'Notes : This routine will work only with those program that send their output to
' the standard output device (stdout).
' Windows NT ONLY.
'Revisions :
Function ShellExecuteCapture(sCommandLine As String, Optional bShowWindow As Boolean = False) As String
Const clReadBytes As Long = 256, INFINITE As Long = &HFFFFFFFF
Const STARTF_USESHOWWINDOW = &H1, STARTF_USESTDHANDLES = &H100&
Const SW_HIDE = 0, SW_NORMAL = 1
Const NORMAL_PRIORITY_CLASS = &H20&
Const PIPE_CLIENT_END = &H0 'The handle refers to the client end of a named pipe instance. This is the default.
Const PIPE_SERVER_END = &H1 'The handle refers to the server end of a named pipe instance. If this value is not specified, the handle refers to the client end of a named pipe instance.
Const PIPE_TYPE_BYTE = &H0 'The named pipe is a byte pipe. This is the default.
Const PIPE_TYPE_MESSAGE = &H4 'The named pipe is a message pipe. If this value is not specified, the pipe is a byte pipe
Dim tProcInfo As PROCESS_INFORMATION, lRetVal As Long, lSuccess As Long
Dim tStartupInf As STARTUPINFO
Dim tSecurAttrib As SECURITY_ATTRIBUTES, lhwndReadPipe As Long, lhwndWritePipe As Long
Dim lBytesRead As Long, sBuffer As String
Dim lPipeOutLen As Long, lPipeInLen As Long, lMaxInst As Long
tSecurAttrib.nLength = Len(tSecurAttrib)
tSecurAttrib.bInheritHandle = 1&
tSecurAttrib.lpSecurityDescriptor = 0&
lRetVal = CreatePipe(lhwndReadPipe, lhwndWritePipe, tSecurAttrib, 0)
If lRetVal = 0 Then
'CreatePipe failed
Exit Function
End If
tStartupInf.cb = Len(tStartupInf)
tStartupInf.dwFlags = STARTF_USESTDHANDLES Or STARTF_USESHOWWINDOW
tStartupInf.hStdOutput = lhwndWritePipe
If bShowWindow Then
'Show the DOS window
tStartupInf.wShowWindow = SW_NORMAL
Else
'Hide the DOS window
tStartupInf.wShowWindow = SW_HIDE
End If
lRetVal = CreateProcessA(0&, sCommandLine, tSecurAttrib, tSecurAttrib, 1&, NORMAL_PRIORITY_CLASS, 0&, 0&, tStartupInf, tProcInfo)
If lRetVal <> 1 Then
'CreateProcess failed
Exit Function
End If
'Process created, wait for completion. Note, this will cause your application
'to hang indefinately until this process completes.
WaitForSingleObject tProcInfo.hProcess, INFINITE
'Determine pipes contents
lSuccess = GetNamedPipeInfo(lhwndReadPipe, PIPE_TYPE_BYTE, lPipeOutLen, lPipeInLen, lMaxInst)
If lSuccess Then
'Got pipe info, create buffer
sBuffer = String(lPipeOutLen, 0)
'Read Output Pipe
lSuccess = ReadFile(lhwndReadPipe, sBuffer, lPipeOutLen, lBytesRead, 0&)
If lSuccess = 1 Then
'Pipe read successfully
ShellExecuteCapture = Left$(sBuffer, lBytesRead)
End If
End If
'Close handles
Call CloseHandle(tProcInfo.hProcess)
Call CloseHandle(tProcInfo.hThread)
Call CloseHandle(lhwndReadPipe)
Call CloseHandle(lhwndWritePipe)
End Function
Sub Test()
'Debug.Print ShellExecuteCapture("C:\first.bat", False)
Text1.Text = ShellExecuteCapture("C:\first.bat", False)
End Sub
Private Sub Command1_Click()
Call Test
End Sub
I got this solution from the following link:
Solution Link

Answer 2

Your example is not a batch file, but if all you want to do is display the results of a command prompt's dir c:\ command in a textbox, then the following should work:
Disclaimer: The following is "Air Code" and not tested for syntax
Private Sub Command1_Click()
Dim sCommand As String
sCommand = "dir c:\ > C:\tempFile.txt"
Shell "%COMSPEC% /c " & sCommand
Dim inCh As Integer
inCh = Freefile
Open "C:\tempFile.txt" For Input As inCh
Text1.Text = Input$(Lof(inCh), inCh)
Close inCh
End Sub
There are several variations and alternative ways to accomplish this, this is just a quick-and-dirty solution example.

Answer 3

Lots of simple ways to skin this cat, for example:
Option Explicit
'Reference to: Windows Script Host Object Model
Private WshExec As IWshRuntimeLibrary.WshExec
Private Sub Form_Load()
With New IWshRuntimeLibrary.WshShell
Set WshExec = .Exec("cmd.exe /c dir c:\")
End With
Timer1.Interval = 100
End Sub
Private Sub Form_Resize()
If WindowState <> vbMinimized Then
Text1.Move 0, 0, ScaleWidth, ScaleHeight
End If
End Sub
Private Sub Timer1_Timer()
With WshExec
Select Case .Status
Case WshFinished, WshFailed
Text1.Text = .StdOut.ReadAll()
Timer1.Interval = 0
End Select
End With
End Sub