C++ Symbian RThread的问题

我有以下代码：

void MyAppAppUi::ConstructL()
{
    _LIT(KString1, "asd");
    TBuf<15> buf1(KString1);
    TInt iStackSize = 32000;

    RThread iThread;

    TInt err = iThread.Create(
                buf1,
                func,
                iStackSize,
                NULL,
                NULL
               );
    iThread.Resume();
}
TInt func(TAny *obj)
{
    CAknInformationNote* note = new(ELeave)CAknInformationNote;
    TBuf<32> msg;
    msg.Format(_L(" rasdasd "));
    note->ExecuteLD(msg);
}

问题是它没有进入函数：func

---

err等于KErrNone

我认为线程正在运行，但问题是您正在运行的线程失败了

主要问题是，您试图在另一个线程中编写UI代码。这通常不起作用，在主线程上创建所有UI内容。所以你的代码无论如何都不会工作

您还需要了解Symbian的概念，如there资源管理（清理堆栈）和活动对象

通常，启动Symbian线程时，需要使用标准Symbian基础结构设置线程。您几乎总是需要在新线程上设置清理堆栈，并且可能需要选择性地设置ActiveScheduler（尽管在启动ActiveScheduler之前至少需要一个活动对象）

有关如何创建和管理线程，请参见本节

要稍微细分示例，请执行以下操作：

您需要清理堆栈基础结构：

TInt ThreadFunction(TAny* aParams)
    {
    // 1. Add cleanup stack support.
    CTrapCleanup* cleanupStack = CTrapCleanup::New();

    // 2. Get pointer to thread host
    CMyThread* host = (CMyThread*)aParams;

    TRAPD(err,

... your code here ...

        );

    host->ThreadExecuted(err);
    delete cleanupStack;
    return KErrNone;
    }

如果需要使用活动对象，还需要设置ActiveScheduler：

TInt ThreadFunction(TAny* aParams)
    {
    // 1. Add cleanup stack support.
    CTrapCleanup* cleanupStack = CTrapCleanup::New();

    // 2. Get pointer to thread host
    CMyThread* host = (CMyThread*)aParams;

    TRAPD(err,
        // 3. Add support for active objects
        CActiveScheduler* activeScheduler = new (ELeave) CActiveScheduler;
        CleanupStack::PushL(activeScheduler);
        CActiveScheduler::Install(activeScheduler);

        // 4. Create and start your active object here
..... you active object goes stuff here

        // NOTE: When adding CActiveScheduler support for threads we have to
        // add atleast one active object in it or it fails on 
        // CActiveScheduler::Start().
        // CPeriodic is derived from CActive active object so that is good for
        // this example.

        // 5. --> Thread execution starts
        CActiveScheduler::Start();
        // 6. --> Thread execution ends (waiting for CActiveScheduler::Stop())

        CleanupStack::PopAndDestroy(... your active object here....);
        CleanupStack::PopAndDestroy(activeScheduler);
        );

    host->ThreadExecuted(err);
    delete cleanupStack;
    return KErrNone;
    }

---

看起来您正在堆栈上分配thread对象，这可能是个坏主意，除非您显式地等待线程完成。我的猜测是，当

ConstructL

返回并且

iThread

对象被销毁时，线程就会停止。

TInt ThreadFunction(TAny* aParams)
    {
    // 1. Add cleanup stack support.
    CTrapCleanup* cleanupStack = CTrapCleanup::New();

    // 2. Get pointer to thread host
    CMyThread* host = (CMyThread*)aParams;

    TRAPD(err,
        // 3. Add support for active objects
        CActiveScheduler* activeScheduler = new (ELeave) CActiveScheduler;
        CleanupStack::PushL(activeScheduler);
        CActiveScheduler::Install(activeScheduler);

        // 4. Create and start your active object here
..... you active object goes stuff here

        // NOTE: When adding CActiveScheduler support for threads we have to
        // add atleast one active object in it or it fails on 
        // CActiveScheduler::Start().
        // CPeriodic is derived from CActive active object so that is good for
        // this example.

        // 5. --> Thread execution starts
        CActiveScheduler::Start();
        // 6. --> Thread execution ends (waiting for CActiveScheduler::Stop())

        CleanupStack::PopAndDestroy(... your active object here....);
        CleanupStack::PopAndDestroy(activeScheduler);
        );

    host->ThreadExecuted(err);
    delete cleanupStack;
    return KErrNone;
    }