serverdatamodule.pas

Delphi Kylix Database Development 附书代码

unit ServerDataModule;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses
  Windows, Messages, SysUtils, Classes, ComServ, ComObj, VCLCom, DataBkr,
  DBClient, MethodsServer_TLB, StdVcl, DBXpress, FMTBcd, DB, SqlExpr,
  Provider, Variants;

type
  TMethodsDM = class(TRemoteDataModule, IMethodsDM)
    conn: TSQLConnection;
    sqlContacts: TSQLDataSet;
    pvContacts: TDataSetProvider;
    procedure RemoteDataModuleCreate(Sender: TObject);
    procedure RemoteDataModuleDestroy(Sender: TObject);
  private
    { Private declarations }
    FCallback: OleVariant;
  protected
    class procedure UpdateRegistry(Register: Boolean;
      const ClassID, ProgID: string); override;
    function GetServerTime: TDateTime; safecall;
    procedure SetCallback(Callback: OleVariant); safecall;
    procedure TestCallbacks; safecall;
  public
    { Public declarations }
  end;

implementation

uses
  MainForm;
  
{$R *.DFM}

class procedure TMethodsDM.UpdateRegistry(Register: Boolean;
  const ClassID, ProgID: string);
begin
  if Register then
  begin
    inherited UpdateRegistry(Register, ClassID, ProgID);
    EnableSocketTransport(ClassID);
    EnableWebTransport(ClassID);
  end else
  begin
    DisableSocketTransport(ClassID);
    DisableWebTransport(ClassID);
    inherited UpdateRegistry(Register, ClassID, ProgID);
  end;
end;

function TMethodsDM.GetServerTime: TDateTime;
begin
  Result := Now;
end;

procedure TMethodsDM.TestCallbacks;
var
  Index: Integer;
begin
  if not VarIsEmpty(FCallback) then
    for Index := 1 to 3 do
      FCallback.Test;
end;

procedure TMethodsDM.SetCallback(Callback: OleVariant);
begin
  FCallback := Callback;
end;

procedure TMethodsDM.RemoteDataModuleCreate(Sender: TObject);
begin
  PostMessage(frmMain.Handle, UM_CONNECT, 1, 0);
end;

procedure TMethodsDM.RemoteDataModuleDestroy(Sender: TObject);
begin
  PostMessage(frmMain.Handle, UM_CONNECT, -1, 0);
end;

initialization
  TComponentFactory.Create(ComServer, TMethodsDM,
    Class_MethodsDM, ciMultiInstance, tmApartment);
end.