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Sending keystrokes to a shelled APP

Posted on 1998-12-13
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Last Modified: 2010-05-03
I am trying to shell an application then send key strokes to it. The problem is, I try to shell it so it is openned minimized with focus. And then when I use the send key funtion, it doesn't work.
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Question by:mjh2
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mark2150 earned 70 total points
ID: 1449848
You need to open it maximized or normal with focus. Also use an AppActivate just prior to sending it keys and put a DoEvents before and after the SendKeys command. Here is the routine I use to drive external programs with good success:

Public retval As Double     'Spawned child ID

' Launch child task, gotta be visible!

retval = Shell(ChildTaskPath, vbMaximizedFocus)

' Sample call to child task

sendit ("%FO" & FileName & "{enter}")
Call delay(3)

' Subroutine that sends data to child task

Private Sub sendit(txt As String)
'
' Send string to child task
'
    On Error Resume Next
    AppActivate retval      'Make sure child task is active
    DoEvents                'Give it a shot to run
    SendKeys txt, True      'Tell it what to do and wait
    DoEvents                'Cede some more time
'
End Sub

' Delay loop to give child app time to breathe

Private Sub delay(secs As Integer)
'
' Sanity check passed param
'
secs = Abs(secs)
If secs > 100 Then secs = 100
'
' Pass delay value and diddle here until time expires
'
etime = Timer + secs
Do While Timer < etime
    DoEvents
Loop
'
End Sub

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