Thread: Applying data to found window

fMain = Main form
frmClient = new window to be created on click.
StrArr[1] = The data being received (aka the socket ID, aka frmClient's title).

Both forms are in the same project (I've been asked that before).

The frmClient's caption is the Socket's ID. I'm having trouble applying data to a specific control in a window I'm searching for.

I've tried the following;

Code:

var
   WindowHandle : THandle;        
begin
   WindowHandle := FindWindow(nil, PAnsiChar(StrArr[1]));

   if WindowHandle = 0 then Exit;

   if WindowHandle <> 0 then
      begin
         Windows.SetForegroundWindow(WindowHandle);
         frmClient.Label1.Caption := 'abc';
      end;
end;

This gives me;

Code:

---------------------------
Debugger Exception Notification
---------------------------
Project Project1.exe raised exception class EAccessViolation with message 'Access violation at address 00475068 in module 'Project1.exe'. Read of address 000002F8'. Process stopped. Use Step or Run to continue.
---------------------------
OK   Help   
---------------------------

This successfully finds the given window, but how do I apply for example Label1's caption in that specific window?

Tried to check the eventviewer in windows?

Also you can check out this http://www.madshi.net/madExceptDescription.htm

The third thing is that the main form might try to access a datamodule that hasn't been made yet, though then you would normaly get the fancy 0x0000 instead :p But yeah, try the sofware, and you will get your answer pretty fast.

EDIT: Also forgot, read this

http://delphi.about.com/od/objectpas.../aa052201b.htm

It was created, when I double click my Listitem it creates a new form.

With the code above it shows it, I just don't see what the problem is.