我在SFML SF :: Renderwindow中获得了黑屏

我尝试在C Windows表单项目中使用SFML（我仍然是新手）的优点（此处也是新的：D）。我的想法是，当事件发生此事件时，此SFML窗口弹出显示图像。事件发生时，我设法使SFML窗口弹出，但仅带有空白屏幕，但没有显示我想要的纹理...以下是带有SFML涉及的代码的摘录，并带有"//"。。"我将删除不必要的代码：

Batteryalarmdlg.h

class CBatteryAlarmDlg : public CDialog
{
    // ... 
    protected:
    // ...
    // timers
    Timer m_tPowerCheck; // the struct Timer has just two members - int id and int duration
    Timer m_tWindowRefresh;
    // sounds
    sf::SoundBuffer m_sfsbWarningMessageBuffer;
    sf::Sound m_sfsWarningMessageSound;
    std::string m_sPathToWarningMessageSoundFile;
    // sfml window management support
    sf::RenderWindow m_sfwChangePowerMessage;
    sf::Texture m_sftChangePowerMessage;
    sf::RectangleShape m_sfrChangePowerMessage;
    bool m_bIsWindowAlive;
    sf::Event m_sfeEvent;
    // ...
};

在上面的代码上，我刚刚声明了成员。

Batteryalarmdlg.cpp

// ...
BOOL CBatteryAlarmDlg::OnInitDialog()
{
    // ...
    /// init timers ///
    m_tPowerCheck = Timer(42, 1000); // a timer with id == 42 and with a duration == 1,000 ms
    SetTimer(m_tPowerCheck.id, m_tPowerCheck.duration, nullptr);
    m_tWindowRefresh = Timer(1, 15);
    SetTimer(m_tWindowRefresh.id, m_tWindowRefresh.duration, nullptr);
    /// init sounds ///
    m_sPathToWarningMessageSoundFile = "warning-message-2.wav";
    if (!m_sfsbWarningMessageBuffer.loadFromFile(m_sPathToWarningMessageSoundFile))
    {
        MessageBox("Error loading of warning message sound file!");
    }
    m_sfsWarningMessageSound.setBuffer(m_sfsbWarningMessageBuffer);
    /// init messages windows ///
    m_sfwChangePowerMessage.setFramerateLimit(60);
    if (!m_sftChangePowerMessage.loadFromFile("ChagePowerMessage.png"))
    {
        MessageBox("Error loading of warning message image file!");
    }
    m_sfrChangePowerMessage.setSize
        (
            sf::Vector2f(m_sfwChangePowerMessage.getSize().x, m_sfwChangePowerMessage.getSize().y)
        );
    m_sfrChangePowerMessage.setPosition(0, 0);
    m_sfrChangePowerMessage.setTexture(&m_sftChangePowerMessage);
    m_bIsWindowAlive = false;
    return TRUE;  // return TRUE  unless you set the focus to a control
}
    // ...
void CBatteryAlarmDlg::OnTimer(UINT_PTR nIDEvent)
{
    if (nIDEvent == m_tPowerCheck.id)
    {
        if (GetSystemPowerStatus(&m_spsPower) == 0)
        {
            // message = "Error: Could not get the system power status!";
            MessageBox("Error: Could not get the system power status!");
        }       
        if (m_spsPower.ACLineStatus == 0 & m_iPowerChange == 1)
        {
            if (!m_sfwChangePowerMessage.isOpen())
            {
                m_sfwChangePowerMessage.create(sf::VideoMode(800, 600), "Battery allarm : System Power Changed!");
            }
            m_sfwChangePowerMessage.clear();
            m_sfwChangePowerMessage.draw(m_sfrChangePowerMessage);
            m_sfwChangePowerMessage.display();
            m_iPowerChange = 0;
            m_sfsWarningMessageSound.play();
            m_bIsWindowAlive = true;
        }
        if (m_spsPower.ACLineStatus == 1 & m_iPowerChange == 0)
        {
            m_iPowerChange = 1;
        }
    }

    if (nIDEvent = m_tWindowRefresh.id)
    {
        if (m_bIsWindowAlive)
        {
            while (m_sfwChangePowerMessage.pollEvent(m_sfeEvent))
            {
                if
                    (
                        m_sfeEvent.type == sf::Event::Closed ||
                        (m_sfeEvent.type == sf::Event::KeyPressed && m_sfeEvent.key.code == sf::Keyboard::Escape)
                    )
                {
                    m_bIsWindowAlive = false;
                }
            }
            m_sfwChangePowerMessage.clear();
            m_sfwChangePowerMessage.draw(m_sfrChangePowerMessage);
            m_sfwChangePowerMessage.display();
        }
        if(!m_bIsWindowAlive && m_sfwChangePowerMessage.isOpen())
        {
            m_sfwChangePowerMessage.close();
        }
    }
    CDialog::OnTimer(nIDEvent);
}

背后的基本想法是，如果有事件和第一个计时器（每1秒钟的M_TPowerCheck）用完，然后显示SFML窗口绘制图像，然后播放声音。每15 miliseconds（m_twindowrefresh）检查SFML窗口是否打开并重新绘制图片 - 在这里我不确定这是必要的，因为这是静止图像，但最初我认为黑屏是因为我不刷新它，不断地。但仍然 - 只有一个黑屏...：

编辑：SFML的声音正常。