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VB: Postmessage, Shift and control

Posted on 1999-07-22
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Last Modified: 2008-03-17
I tied to use the postmessage command to send keystrokes to MS Word 97 (I'm using Word 97 as a test of my program).  I used the WM_KEYDOWN, WM_CHAR, and WM_KEYUP commands.

(I'm not creating a process instance, I'm just grabbing the hwnd of an already open app.)

The order of messages are:
1.  WM_KEYDOWN shift
2.  WM_KEYDOWN "A"
3.  WM_CHAR "A"
4.  WM_KEYUP "A"

What happens is that a capital A and a lowercase a is sent.  When I remove the WM_CHAR, only one a is sent (lower case).  When I put the caps lock on, then a capital A is sent.  All of the values are &H41 (65 , letter A).

My suspiscion is that when I send the shift message, it doesn't "hold" while the next message is being sent, ie, when I send the a, it checks that status of the shift key.

I'm not sure if this is the way MS Word handles keystrokes, but I need to be able to send keystrokes this way (not via Sendkeys or COM or any way.  I WANT to use the post message way).

My question is, how do I force Shift and letter combinations, and especially, how do I force Control and letter combinations vi postmessage  (send message won't work)?  Do I have to force a caps locks?  What about CTRL, since there is no CTRL lock?  

There are some apps besides Word that I need to send control combinations (ie CTRL + Z)

Thanks,
Ruben
0
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Question by:obregoru
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5 Comments
 

Expert Comment

by:dian98
ID: 1526703
why don't you use SendMessage?

0
 
LVL 2

Author Comment

by:obregoru
ID: 1526704

This seems hard, even for the C++ forum.
I tried using the keybd_event (I'm using NT), a mix of keybd_event, or even all post messages no luck.

VB is reporting the shift being pressed, but it is not functioning in MS word.  I'm still getting lower case a's.

Thanks,
Ruben

Sample
 Call keybd_event(&H10, &H45, KEYEVENTF_EXTENDEDKEY Or 0, 0)
            Call PostMessage(&H105D4, WM_KEYDOWN, &H41, &H1E0001)  'A down
            Call PostMessage(&H105D4, &H101, &H41, &HC01E0001) 'A up
            Call keybd_event(&H10, &H45, KEYEVENTF_EXTENDEDKEY Or KEYEVENTF_KEYUP, 0)
           
0
 
LVL 10

Accepted Solution

by:
viktornet earned 1500 total points
ID: 1526705
here is an example how to do it,....

.....

  dim h as long

  h = FindWindow(vbNullString, "Document - WordPad")
  if h = 0 then
    MsgBox "Error: Invalid Handle"
    Exit Sub
  end if
  call SetFocus(h)
  call SetForegroundWindow(h)

  //lower case letter
  call keybd_event(65, 0, 0, 0);
  call keybd_event(65, 0, KEYEVENTF_KEYUP, 0)

  //upper case letter
  call keybd_event(vk_shift, 0, KEYEVENTF_EXTENDEDKEY, 0)
  call keybd_event(65, 0, 0, 0)
  call keybd_event(65, 0, KEYEVENTF_KEYUP, 0)
  call keybd_event(vk_shift, 0, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP,0)
.....

Hope this helps..

..-=ViKtOr=-..
0
 
LVL 2

Author Comment

by:obregoru
ID: 1526706
Thanks for the answer.  I did more work than I wanted to (I had to find SetFocus...), but it got the job done!

Here is the code I used:

Private Declare Sub keybd_event Lib "user32" _
                                (ByVal bVk As Byte, _
                                ByVal bScan As Byte, _
                                ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
                                 

Private Declare Function FindWindow Lib "user32" Alias _
                                "FindWindowA" (ByVal lpClassName As String, _
                                ByVal lpWindowName As String) As Long

Private Declare Function SetFocusX Lib "user32" Alias "SetFocus" (ByVal hwnd As Long) As Long
'setfocus is a VB reserved word, so we give it a new name

Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long

    Const VK_SHIFT = &H10
    Const KEYEVENTF_EXTENDEDKEY = &H1
    Const KEYEVENTF_KEYUP = &H2
-----

Dim h As Long

         h = FindWindow(vbNullString, "Microsoft Word - Document2")
         If h = 0 Then
           MsgBox "Error: Invalid Handle"
           Exit Sub
         End If


         Call SetFocusX(h)
         Call SetForegroundWindow(h)
         Call keybd_event(&H10, 0, KEYEVENTF_EXTENDEDKEY, 0)
         Call keybd_event(65, 0, 0, 0)
         Call keybd_event(65, 0, KEYEVENTF_KEYUP, 0)
         Call keybd_event(&H10, 0, KEYEVENTF_EXTENDEDKEY Or KEYEVENTF_KEYUP, 0)

0
 
LVL 10

Expert Comment

by:viktornet
ID: 1526707
Well if it works why did I get a B mark instead of an A?
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