8

我正在尝试在线程中使用 COM 接口。根据我的阅读,我必须CoInitialize/CoUninitialize在每个线程中调用。

虽然这工作正常:

procedure TThreadedJob.Execute;
begin
   CoInitialize(nil);

   // some COM stuff

   CoUninitialize;
end;

当我将调用移至构造函数和析构函数时:

TThreadedJob = class(TThread)
...
  protected
    procedure Execute; override;
  public
    constructor Create;
    destructor Destroy; override;
...

constructor TThreadedJob.Create;
begin
  inherited Create(True);
  CoInitialize(nil);
end;

destructor TThreadedJob.Destroy;
begin
  CoUninitialize;
  inherited;
end;

procedure TThreadedJob.Execute;
begin

   // some COM stuff

end;

我得到EOleException: CoInitialize has not been called异常,我不知道为什么。

4

1 回答 1

19

CoInitialize为正在执行的线程初始化 COM。实例的构造函数TThread在创建实例的线程中执行TThread。方法中的代码在Execute新线程中执行。

这意味着如果您需要您的TThreadedJob线程初始化 COM,那么您必须调用CoInitializeExecute方法。或从 调用的方法Execute。以下是正确的:

procedure TThreadedJob.Execute;
begin
  CoInitialize(nil);
  try    
    // some COM stuff
  finally  
    CoUninitialize;
  end;
end;
于 2016-08-15T20:23:55.747 回答