redirect console output - vb6

[gift]

hi
i want to invoke a fortran console application from vb and redirect its output to a textbox at real time.

i tried the following code:

Option Explicit
Private Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As SECURITY_ATTRIBUTES, ByVal nSize As Long) As Long
Private Declare Sub GetStartupInfo Lib "kernel32" Alias "GetStartupInfoA" (lpStartupInfo As STARTUPINFO)
Private Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function SetWindowText Lib "user32" Alias "SetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String) As Long
Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, lpOverlapped As Any) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type

Private Type PROCESS_INFORMATION
hProcess As Long
hThread As Long
dwProcessId As Long
dwThreadId 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 Byte
hStdInput As Long
hStdOutput As Long
hStdError As Long
End Type

Private Type OVERLAPPED
ternal As Long
ternalHigh As Long
offset As Long
OffsetHigh As Long
hEvent As Long
End Type

Private Const STARTF_USESHOWWINDOW = &H1
Private Const STARTF_USESTDHANDLES = &H100
Private Const SW_HIDE = 0
Private Const EM_SETSEL = &HB1
Private Const EM_REPLACESEL = &HC2

Private Sub Command1_Click()
Command1.Enabled = False
Redirect Text1.Text, Text2

Command1.Enabled = True
End Sub

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
If Command1.Enabled = False Then Cancel = True
End Sub

Sub Redirect(CmdLine As String, objTarget As Object)
Dim i%, t$
Dim pa As SECURITY_ATTRIBUTES
Dim pra As SECURITY_ATTRIBUTES
Dim tra As SECURITY_ATTRIBUTES
Dim pi As PROCESS_INFORMATION
Dim sui As STARTUPINFO
Dim hRead As Long
Dim hWrite As Long

Dim bRead As Long
Dim lpBuffer(1024) As Byte
pa.nLength = Len(pa)
pa.lpSecurityDescriptor = 0
pa.bInheritHandle = True

pra.nLength = Len(pra)
tra.nLength = Len(tra)

If CreatePipe(hRead, hWrite, pa, 0) <> 0 Then
sui.cb = Len(sui)
GetStartupInfo sui

sui.hStdOutput = hWrite
sui.hStdError = hWrite
sui.dwFlags = STARTF_USESHOWWINDOW Or STARTF_USESTDHANDLES
sui.wShowWindow = SW_HIDE
If CreateProcess(vbNullString, CmdLine, pra, tra, True, 0, 0, vbNullString, sui, pi) <> 0 Then

SetWindowText objTarget.hwnd, ""


Do
Erase lpBuffer()

If ReadFile(hRead, lpBuffer(0), 1023, bRead, ByVal 0&) Then
SendMessage objTarget.hwnd, EM_SETSEL, -1, 0
SendMessage objTarget.hwnd, EM_REPLACESEL, False, lpBuffer(0)
DoEvents
Else
CloseHandle pi.hThread
CloseHandle pi.hProcess
Exit Do
End If
CloseHandle hWrite
Loop
CloseHandle hRead
End If
End If

End Sub

it works fine with ping command...but gives the following error with the fortran application:

forrtl: The handle is invalid.forrtl: severe (39): error during read, unit 5, file CONIN$

i tried it with batch files by redirecting output to a file..this works...but iam able to display d output in d textbox only after the fortran application completes as i am unable to access the output file while it is being written...

can sum1 plz offer a solution by either of d ways???its urgent n me all bugged up trying this ...thanx a lot....

[randem]

Please indent your code and use code tags to post it. It help to make it readable to other you want to enlist to help. Why not pipe the output directly to the textbox. I believe all you need is the textbox handle.

[gift]

oops...sorry should hav made the code more readable....here is the code:

Option Explicit
Private Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As SECURITY_ATTRIBUTES, ByVal nSize As Long) As Long
Private Declare Sub GetStartupInfo Lib "kernel32" Alias "GetStartupInfoA" (lpStartupInfo As STARTUPINFO)
Private Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function SetWindowText Lib "user32" Alias "SetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String) As Long
Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, lpOverlapped As Any) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Type SECURITY_ATTRIBUTES
    nLength As Long
    lpSecurityDescriptor As Long
    bInheritHandle As Long
End Type

Private Type PROCESS_INFORMATION
    hProcess As Long
    hThread As Long
    dwProcessId As Long
    dwThreadId 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 Byte
    hStdInput As Long
    hStdOutput As Long
    hStdError As Long
    End Type
    
    Private Type OVERLAPPED
    ternal As Long
    ternalHigh As Long
    offset As Long
    OffsetHigh As Long
    hEvent As Long
End Type

Private Const STARTF_USESHOWWINDOW = &H1
Private Const STARTF_USESTDHANDLES = &H100
Private Const SW_HIDE = 0
Private Const EM_SETSEL = &HB1
Private Const EM_REPLACESEL = &HC2

Private Sub Command1_Click()
    Command1.Enabled = False
    Redirect Text1.Text, Text2
    Command1.Enabled = True
End Sub

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
    If Command1.Enabled = False Then Cancel = True
End Sub

Sub Redirect(CmdLine As String, objTarget As Object)
    Dim i%, t$
    Dim pa As SECURITY_ATTRIBUTES
    Dim pra As SECURITY_ATTRIBUTES
    Dim tra As SECURITY_ATTRIBUTES
    Dim pi As PROCESS_INFORMATION
    Dim sui As STARTUPINFO
    Dim hRead As Long
    Dim hWrite As Long
    
    Dim bRead As Long
    Dim lpBuffer(1024) As Byte
    pa.nLength = Len(pa)
    pa.lpSecurityDescriptor = 0
    pa.bInheritHandle = True
    
    pra.nLength = Len(pra)
    tra.nLength = Len(tra)

    If CreatePipe(hRead, hWrite, pa, 0) <> 0 Then
        sui.cb = Len(sui)
        GetStartupInfo sui
        
        sui.hStdOutput = hWrite
        sui.hStdError = hWrite
        sui.dwFlags = STARTF_USESHOWWINDOW Or STARTF_USESTDHANDLES
        sui.wShowWindow = SW_HIDE
        If CreateProcess(vbNullString, CmdLine, pra, tra, True, 0, 0, vbNullString, sui, pi) <> 0 Then

                SetWindowText objTarget.hwnd, ""

                Do
                    Erase lpBuffer()

                    If ReadFile(hRead, lpBuffer(0), 1023, bRead, ByVal 0&) Then
                        SendMessage objTarget.hwnd, EM_SETSEL, -1, 0
                        SendMessage objTarget.hwnd, EM_REPLACESEL, False, lpBuffer(0)
                        DoEvents
                    Else
                        CloseHandle pi.hThread
                        CloseHandle pi.hProcess
                        Exit Do
                    End If
                    CloseHandle hWrite
                Loop
                CloseHandle hRead
        End If
    End If

End Sub

@ randem...
I didt get wat u meant...as i m new to VB...so could u plzz tell me wat changes r required in code....???????

Thnx in advance...

[randem]

Ok, I am looking at your code and Where does Text2 become an object? and what object does it become?

[danasegarane]

This
one worked for me

Dana

[randem]

OK, I found it. You are using the example from All-API. It would help if you did not remove their comments... It would suggest you are attempting to pass their work off as your own.

I will look into other programs piping data to the textbox.

[randem]

What command line are you using to execute the Fortran program thru the textbox?