[pywin32-bugs] problem in clicking a button

[mahesh <ma...@pr...>]

Dear all,
=20
     I was trying to automate the process of GUI mode installation of a =
product.
    =20
     Here is a sample piece of code that i was using to click a button =
(It works on most applications ) :

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-------------------------------------------------------------------
   =20
'''
   Get the next button on the window handle and Click "Next"
'''
def clickNext(xWindow,pageno,button=3D"Next"):
    print "\t\t Clicking button !! ",button
    btnEnter=3D[]
    try:
        btnEnter=3D findControl(xWindow, wantedClass=3D"Button", =
wantedText=3Dbutton)
        if btnEnter:
                print "\t Able to get the button =
",win32gui.GetWindowText(btnEnter[0])
    except:
        if btnEnter:
                print "Unable to get the button =
",win32gui.GetWindowText(btnEnter[0])
        print " $$$ EXCEPTION CLICKING THE BUTTON :> ",button," id=3D =
",btnEnter
                #return 0
        return 0

    clickButton(btnEnter[0])
    print "Operation Button Press on =
",win32gui.GetWindowText(btnEnter[0])," button on page ",pageno,"  on =
window ",xWindow

    return 1


'''
   Simulates a single mouse click on a button
'''
def clickButton(hwnd):
    #print "Clicking ",win32gui.GetWindowText(hwnd)
    _sendNotifyMessage(hwnd, win32con.BN_CLICKED)
    #print "Clicked ",win32gui.GetWindowText(hwnd)


def _sendNotifyMessage(hwnd, nofifyMessage):
    '''Send a notify message to a control.'''
    hbutton=3Dhwnd
    #print "WindowLong =3D =
",win32api.GetWindowLong(hwnd,win32con.GWL_ID)
    print "Clicking ",win32gui.GetWindowText(hwnd)
    =
#win32gui.SendMessage(win32gui.GetParent(hwnd),win32con.WM_COMMAND,_build=
WinLong(nofifyMessage,win32api.GetWindowLong(hwnd,win32con.GWL_ID)),hwnd)=

    win32api.PostMessage(hbutton, win32con.WM_LBUTTONDOWN, 0, 0)
    win32api.PostMessage(hbutton, win32con.WM_LBUTTONUP, 0, 0)
    print "Clicked ",win32gui.GetWindowText(hwnd)


'''
   Return a list of of controls of the given text and class
'''
def =
findControl(topHwnd,wantedText=3DNone,wantedClass=3DNone,selectionFunctio=
n=3DNone):
    controls =3D findControls(topHwnd,
                            wantedText=3DwantedText,
                            wantedClass=3DwantedClass,
                            selectionFunction=3DselectionFunction)
    if controls:
        return controls
    else:
        raise WinGuiAutoError("No control found for topHwnd=3D" +
                               repr(topHwnd) +
                               ", wantedText=3D" +
                               repr(wantedText) +
                               ", wantedClass=3D" +
                               repr(wantedClass) +
                               ", selectionFunction=3D" +
                               repr(selectionFunction))

def =
findControls(topHwnd,wantedText=3DNone,wantedClass=3DNone,selectionFuncti=
on=3DNone):
    def searchChildWindows(currentHwnd):
        results =3D []
        childWindows =3D []
        try:
            win32gui.EnumChildWindows(currentHwnd,
                                      _windowEnumerationHandler,
                                      childWindows)
        except win32gui.error:
            # This seems to mean that the control *cannot* have child =
windows,
            # i.e. not a container.
            return
        for childHwnd, windowText, windowClass in childWindows:
            descendentMatchingHwnds =3D searchChildWindows(childHwnd)
            if len(windowText)>0: pass
               #print "childwindows : >",windowText, ">",len(windowText)
            if descendentMatchingHwnds:
                results +=3D descendentMatchingHwnds

            if wantedText and \
               not _normaliseText(wantedText) in =
_normaliseText(windowText):
                continue
            if wantedClass and \
               not windowClass =3D=3D wantedClass:
                continue
            if selectionFunction and \
               not selectionFunction(childHwnd):
                continue
            results.append(childHwnd)
        return results

    return searchChildWindows(topHwnd)

'''
   Simulates a single mouse click on a button
'''
def clickButton(hwnd):
    #print "Clicking ",win32gui.GetWindowText(hwnd)
    _sendNotifyMessage(hwnd, win32con.BN_CLICKED)
    #print "Clicked ",win32gui.GetWindowText(hwnd)


def _sendNotifyMessage(hwnd, nofifyMessage):
    '''Send a notify message to a control.'''
    hbutton=3Dhwnd
    #print "Clicking >: ",hwnd, "  ||  Parent is > =
",win32gui.GetParent(hwnd)
    #print "WindowLong =3D =
",win32api.GetWindowLong(hwnd,win32con.GWL_ID)
    print "Clicking ",win32gui.GetWindowText(hwnd)
    =
#win32gui.SendMessage(win32gui.GetParent(hwnd),win32con.WM_COMMAND,_build=
WinLong(nofifyMessage,win32api.GetWindowLong(hwnd,win32con.GWL_ID)),hwnd)=

    win32api.PostMessage(hbutton, win32con.WM_LBUTTONDOWN, 0, 0)
    win32api.PostMessage(hbutton, win32con.WM_LBUTTONUP, 0, 0)
    print "Clicked ",win32gui.GetWindowText(hwnd)


def _buildWinLong(high, low):
    # return ((high << 16) | low)
    return int(struct.unpack('>L',struct.pack('>2H',high,low)) [0])


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-------------------------

    Interestingly ,the installshield is coded in Java.  So the problem i =
am facing is as follows :

    Problem  :  I am unable to click the "Next" button using the above =
code for automation .

    Description of the problem :

    When we start the installer GUI comes up . Keep Pressing next =
(manually)  screen1 -> screen2 -> screen 3 -> ...screen n ->......screen =
z(Finish screen).

    Once we reach the nth screen and run the script to view all =
childwindows of the current installer window .I am able to get the =
handles of all the components that were residing in all the screens from =
1 to n. I am also able to edit the text in the textfield component and =
click to select the radio buttons.

    But most importantly i am unable to click the button "Next" through =
the above code. In other words , Manual clicks on 'Next" works (Takes me =
from screen n to screen [n+1] ) but not through the above code .

    So, is this a problem with respect to Java only (Java's Internal =
Event handling Architecture) ?

    or Do u think any code level changes can be made to make the "Click" =
work ?


Thanks in advance,
Mahesh