6

我是 c++ builder 的新手,不熟悉线程,我希望有人可以发布示例或指出正确的方向。

我有一个formShow()在 c++ builder 中加载函数的表单。它做了我想让我的程序做的事情,但只有在那之后它才会显示实际的表单。

为此,我需要线程化程序的表单和后台运行。任何人都可以帮助我吗?

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1 回答 1

8

将逻辑延迟到OnShow事件退出之后可能更简单,根本不使用线程。例如:

const UINT WM_DO_WORK = WM_USER + 1;

void __fastcall TForm1::FormShow(TObject *Sender)
{
    PostMessage(Handle, WM_DO_WORK, 0, 0);
}

void __fastcall TForm1::WndProc(TMessage &Message)
{
    if (Message.Msg == WM_DO_WORK)
    {
        // do work here ...
    }
    else
        TForm::WndProc(Message);
}

如果你真的想线程化代码,你可以这样做:

class TMyThread : public TThread
{
protected:
    virtual void __fastcall Execute();
public:
    __fastcall TMyThread();
};

__fastcall TMyThread::TMyThread()
    : TThread(true)
{
    FreeOnTerminate = true;
    // setup other thread parameters as needed...
}

void __fastcall TMyThread::Execute()
{
    // do work here ...
    // if you need to access the UI controls,
    // use the TThread::Synchornize() method for that
}

void __fastcall TForm1::FormShow(TObject *Sender)
{
    TMyThread *thrd = new TMyThread();
    thrd->OnTerminate = &ThreadTerminated;
    thrd->Resume();
}

void __fastcall TForm1::ThreadTerminated(TObject *Sender)
{
    // thread is finished with its work ...
}
于 2012-07-24T23:09:30.990 回答