Par2: Finding If A Specific Open Window Apps Exists 2009-03-17 -- Robert Price Last week I asked how I could find if another App was open. The problem
was I couldn't be sure of it's window title because that depends on
whether or not it had any child windows open.
After Steve Parker pointed me in the right direction, further search
found that another programmer (vpos) posted this on Tek-Tips Forums
website. For my purposes I found that the GetClassName function was not
needed and there was no reason to use the second If statement by
directly taking the sub() of the returned wTitle.
Here was his posting
vpos (Programmer)
21 Nov 02 11:56
try this prototype for findwindow:
Module('winapi')
FindWindow(<*cstring>,*cstring),unsigned,pascal,raw,name('FindWindowA')
End
The first parameter is the name of the class, for a clarion application
it will be something like ClaWin and a lot of figures... ie
Clawin8388608Class1
The second parameter is the title of the window (in the title bar.)
if you pass a NULL to the calss name then windows then this api will
look through all the classes.. otherwise it will search everywhere.
If it still does not work then try this other method, it loop through
all the opened windows (visible or not) until it finds a clarion
program, then checks that it is the one you are interrested in.
module('winapi')
GetClassName(UNSIGNED,*CSTRING,SIGNED),SIGNED,PASCAL,RAW,NAME('GetClassNameA')
GetWindowText(Long,Long,SIGNED),SIGNED,PASCAL,RAW,NAME('GetWindowTextA')
End
WindowHandle USHORT
WindowTitle CSTRING(256)
ClassName CSTRING(256)
FindWindowName = 'The title of of the window to close'
Loop WindowHandle = 1 To 0FFFFh
rlen# = GetWindowText(WindowHandle,Address(WindowTitle),200)
If rlen# Then
ret# = GetClassName(WindowHandle,ClassName,200)
If (Sub(ClassName,1,6) = 'ClaWin') And Clip(WindowTitle) =
FindWindowName) Then
MESSAGE('You cannot run more than one instance of ' &
FindWindowName)
Return
End
End
End
ere is what I ended up with for my final code:
I have an Entry string Field for input of either a patients last name or
numeric Id number and a Lookup Button that either can be used to find a
patients record. In the "When Selected before Generated Code"
Do CheckOpenWindow
If SkipLookupPatient
Select(?Anyotherfield)
Cycle
.
!! Inside Global Map embed
Module('Win32 API')
GetWindowText(Long,Long,SIGNED),SIGNED,PASCAL,RAW,NAME('GetWindowTextA')
End
!! Local Data Variables
wHnd (Long)
wTitle (CString)
SkipLookupPt (Byte)
rlen (long)
CheckOpenWindow Routine !Code to check for Open App
SkipLookUpPatient = False
wTitle = 'KODAK'
Clear(wHnd)
Clear(rlen)
Loop wHnd = 1 To 0FFFFh
rlen = GetWindowText(wHnd,Address(WTitle),200)
If rlen
If Sub(wTitle,1,5) = 'KODAK'
MESSAGE('Please Close X-Ray Program' &'|Before
Continuing with Another Patient','Notice',Icon:Exclamation)
SkipLookUpPatient = True
Exit
End ! end If sub
End ! end if rlen
End ! end Loop
!!!!!!!!!!!!
I was concerned about the time delay that might occur when the lookup
was being done as it is a rather Brute Force way of finding the App with
Open Window. It could be conceivably be hundred or more windows
returned during the loop. However, there has been no noticeable delay
that the user has been able to detect.
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