在主线程中,我有一个表单(TForm),它有一个私有数据成员(私有字符串),只有工作线程才能写入(我在它恢复之前将指针传递给线程).当工作线程完成其webservice调用并将结果响应xml写入表单上的私有成员时,工作线程使用PostMessage将消息发送到表单的句柄(我在恢复之前也将其传递给线程).

interface

const WM_WEBSERVCALL_COMPLETE = WM_USER + 1;

type 
  TWebServiceResponseXML = string;
  PWebServiceResponseXML = ^TWebServiceResponseXML;

  TMyForm = class(TForm)
    ...
  private
    ...
    fWorkerThreadID: Cardinal;
    fWebServiceResponseXML: TWebServiceResponseXML;
  public
    ...
    procedure StartWorkerThread;
    procedure OnWebServiceCallComplete(var Message: TMessage); Message WM_WEBSERVCALL_COMPLETE;
  end;

  TMyThread = class(TThread)
  private      
  protected
    procedure Execute; override;
  public
    SenderHandle: HWnd;
    RequestXML: string;
    ResponseXML: string;
    IMyService: IService;
    PResponseXML: PWebServiceResponseXML;
  end;

implementation

procedure TMyForm.StartWorkerThread;
var
  MyWorkerThread: TMyThread;
begin
  MyWorkerThread := TMyThread.Create(True);
  MyWorkerThread.FreeOnTerminate := True;
  MyWorkerThread.SenderHandle := self.Handle;
  MyWorkerThread.RequestXML := ComposeRequestXML;
  MyWorkerThread.PResponseXML := ^fWebServiceResponseXML;
  MyWorkerThread.Resume;
end;

procedure TMyForm.OnWebServiceCallComplete(var Message: TMessage);
begin
  // Do what you want with the response xml string in fWebServiceResponseXML
end;

procedure TMyThread.Execute;
begin
  inherited;
  CoInitialize(nil);
  try
    IMyService := IService.GetMyService(URI);
    ResponseXML := IMyService.Search(RequestXML);
    PResponseXML := ResponseXML;
    PostMessage(SenderHandle,WM_WEBSERVCALL_COMPLETE,0);
  finally
    CoUninitialize;
  end;
end;

它工作得很好,但现在我想从数据模块(没有Handle)做同样的事情……所以我真的很感激一些有用的代码来补充我的工作模型.

编辑

我真正想要的是能够让我替换线路的代码(如果可能的话)

MyWorkerThread.SenderHandle := self.Handle;

同

MyWorkerThread.SenderHandle := GetHandleForThisSOAPDataModule;