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service postmessage problem

lloydie-t
lloydie-t asked
on
Medium Priority
334 Views
Last Modified: 2010-04-04
I have an app which I am converting to a service. The service consist of the service, a datamodule and a unit for various threads.
In the original app I was using post message to send strings to the mainform, but as the datamodule does not have a window handle this is a problem. I was only using postmessage as the old app would update a 'richedit' box on a window form. As there is now no  window forms what is the best way to get round my problem? Should I now just call the datamodule method directly?

DATAMODULE
====================================

{*****************************************************
Receive Data from Thread 4
******************************************************}
procedure TDataModule2.WMMyDataParse4(var Message: TMessage);
var
    CallString,p: String;
    EndStr,StrCheck: integer;
begin
   p := pMyDataParse4(Message.LParam).IPDataString;
   Dispose(pMyDataParse4(Message.LParam));
            Regex4 := TPerlRegEx.Create(nil);
            Regex4.RegEx := RegExpStr4;
            Regex4.Subject := p;
              if Regex4.Match then begin
              StrCheck := 1;
                  if RegExpEnd4 = '1' then begin
                  EndStr := 1;
                  StrCheck := 0;
                  end
                  else
                  Endstr := 0;
                  StrCheck :=1;
              end;
               if RegExpEnd4 <> '1' then begin
                Regex4.RegEx := RegExpEnd4;
                Regex4.Subject := p;
                if Regex4.Match then begin
                EndStr := 1;
                StrCheck := 0;
                end
                else begin
                EndStr := 0;
                StrCheck := 1;
                end;
               end;

                if EndStr = 1 then begin
                sysStr4 := sysStr4+p;
                CallString := CallConv(sysStr4,PhonesysID4);
                CallString := CallString+',4,4';
                ProcessSearch2(CallString);
                EndStr := 0;
                SysStr4 := '';
                end
                else begin
                if StrCheck = 1 then
                SysStr4 := SysStr4+p+#13#10;
                end;
end;
===========================================


UNIT2
==========================================

{***********************************************
Process calls for port4
***********************************************}
procedure TTCPRecvThrd4.Execute;
var
//  s: string;
  LCmd: string;
  MyDataParse4 : pMyDataParse4;
begin
  sock:=TTCPBlockSocket.create;
  try
    Sock.socket:=CSock;
    sock.GetSins;
    with sock do
      begin
        repeat
          if terminated then break;
          LCMD := RecvString(60000);
          if lastError<>0 then break;
          SendString(LCmd+#13#10);
          New(MyDataParse4);
          MyDataParse4.IPDataString := LCmd;
          PostMessage(collexServiceUnit2, WM_MyDataParse4, 0, integer(MyDataParse4));
          if lastError<>0 then break;
        until false;
      end;
  finally
    Sock.Free;
  end;
end;
===========================================
Comment
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Sr. Software Engineer
CERTIFIED EXPERT
Commented:
calling the datamodule method directly could be a good solution.
If you want to keep using messages you should take a look at AllocateHwnd();
This functions allows you to create a 'fake' window to be able to receive messages if you have no normal window.
You will probably also have to make your own message loop if you want this, so calling directly is a simpler option (maybe through an event?)

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Lukasz Zielinskisoftware developer
CERTIFIED EXPERT
Top Expert 2008
Commented:
or try PostThreadMessage
ziolko.
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