Delphi simple TCP server hangs. The form freezes but the server continues managing the clients.

Posted by NeoNMD on Stack Overflow See other posts from Stack Overflow or by NeoNMD
Published on 2010-04-22T21:04:42Z Indexed on 2010/04/22 23:13 UTC
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I'm using a form with an IdTCPServer on it managing strings from the client with a AThread.connection.readln/writeln system. The string handling works and that isn't the problem.

The thing is, the form with the server on it hangs and will not load, but it still managed all the clients connected to it so it IS running but it just doesn't work as a form. I'll make a guess that its sitting on a readline or something... but I have NO idea how i can fix this at this moment in time.

Please help.

procedure TMonitorFrm.ServerExecute(AThread: TIdPeerThread);

    procedure post(PostMessage:string);
    begin
            try
                    AThread.Connection.WriteLn(PostMessage);
            except
                    showmessage('Cannot post');
            end;
    end;

var
        ActClient       : PClient;
        sTemp,
        CommBlock,
        NewCommBlock,
        ReceiverName,
        sContent,
        sSQL,
        sCommand        : String;
        iCount2,
        iCount          : Integer;

        sldb    : TSQLiteDatabase;
        sltb    : TSQLiteTable;

begin
        if not AThread.Terminated and AThread.Connection.Connected then
        begin
                CommBlock := AThread.Connection.ReadLn();
                ActClient := PClient(AThread.Data);
                ActClient.LastAction := Now;
                sCommand := copy(CommBlock,0,pos(',',CommBlock)-1); {seperate command}
                sContent := copy(CommBlock,pos(',',CommBlock)+1,length(CommBlock)-(pos(',',CommBlock)+1)); {seperate data block}
                iCount:= 0 ;

            if sCommand = 'Announce' then //SPECIAL
            begin
                    { Do stuff for this command...}
            end

            else if sCommand = 'CheckSect' then
                    {Etcetera...}

procedure TMonitorFrm.FormCreate(Sender: TObject);
var
        sCompetitionID  : string;
        sldb    : TSQLiteDatabase;
        sltb    : TSQLiteTable;
begin
        Clients := TThreadList.Create;
        Server.Active := True;
        AreaPnlList := TComponentList.Create;
        SectionPnlList := TComponentList.Create;
        Repeat until InputQuery('Competition Select', 'Please type the ID of the competition', sCompetitionID);
        iCompetitionID:=StrToInt(sCompetitionID);
        OpenDatabase(slDb);
        sltb:=slDb.GetTable('SELECT * FROM SectionTable WHERE CompetitionID='+sCompetitionID);
        Frame31.CreateSections(sltb,Frame31);
        sltb.Free;
        CloseDatabase(slDb);
{
This section needs to check the SQLite databases for sections and list them in the display window and makes a drag n drop profile...
}
end;

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