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how to use FindWindowEx() and WM_GETTEXT

Posted on 2004-08-09
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Last Modified: 2010-04-06
2 questions:
1. I know how to use FindWindow() but how do I use FindWindowEx() ? (i need parameter description)

2. I want to get text from a TEdit (outside the form) with SendMessage() and WM_GETTEXT.  How can I do that?

din345
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Question by:din345
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8 Comments
 
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by:alikoank
ID: 11750769
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by:Ivanov_G
ID: 11750803
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by:din345
ID: 11750833
thanks for your answer. i dont't know how to use SendMessage(Edit1.Handle,  WM_GETTEXT,  bBytes, szBuffer)

bBytes and szBuffer - what's that?

I want to show the grabbed text like this: ShowMessage(SendMessage(Edit1.Handle,  WM_GETTEXT,  bBytes, szBuffer));

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by:din345
ID: 11750837
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by:alikoank
alikoank earned 20 total points
ID: 11750886
try this one,

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Windowing/Windows/WindowReference/WindowFunctions/FindWindowEx.asp

var
  bBytes:integer;
  szBuffer:array[0..512] of char; //must be big enough to keep your data.
begin
   bBytes:=sizeof(szBuffer);
   FillChar(szBuffer, bBytes, 0);
   SendMessage(Edit1.Handle,  WM_GETTEXT,  bBytes, szBuffer);
   ShowMessage(szBuffer, 'title', MB_OK);
end;

assuming you are trying to access a TEdit control in another program look atIvanov_G's code on how to obtain window Handle.
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Expert Comment

by:Ivanov_G
ID: 11750887
did you looked at my post ? I think it is clear enough...

var
  IE_Handle     : HWND;
  URL           : array[0..255] of Char;
begin
  ...
  SendMessage(IE_Handle, WM_GETTEXT, sizeof(URL), Integer(@URL[0]));
  Memo1.Lines.Add(String(URL));
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by:din345
ID: 11750943
> did you looked at my post ? I think it is clear enough...
yes i did.

SendMessage(FindWindowEx(FindWindow('notepad', nil),  WM_GETTEXT,  bBytes, szBuffer);

[Error] Unit1.pas(34): Incompatible types: 'Integer' and 'PChar'
[Error] Unit1.pas(34): Not enough actual parameters

??

can't compile...
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Accepted Solution

by:
Ivanov_G earned 20 total points
ID: 11750968
I don't see where I used PChar... Maybe you are messing my answer with someone else.

Your code should look like this:

var
  Notepad_Handle     : HWND;
  Text                      : array[0..4096] of Char;
begin
  Notepad_Handle := FindWindowEx(FindWindow('notepad', nil);
  SendMessage(Notepad_Handle, WM_GETTEXT, sizeof(Text), Integer(@Text[0]));
  Memo1.Lines.Add(String(Text));
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