XBalloonMsg - a non-MFC balloon-shaped message box

原文链接：XBalloonMsg - a non-MFC balloon-shaped message box

只需要调用下面两个函数：

Function	Description
void Show()	显示气泡状信息
void Destroy()	从屏幕上删除气泡状信息

//=============================================================================
// special symbol for title string - replaced with module name
#define LPCTSTR_DEFAULT_TITLE    ((LPCTSTR)-1L)

//=============================================================================
class CXBalloonMsg
//=============================================================================
{
// Construction
public:
    CXBalloonMsg();
    virtual ~CXBalloonMsg();

// Attributes
public:
    static HWND m_hWndBalloon;

// Operations
public:
    static void Show(LPCTSTR lpszTitle, 
                     LPCTSTR lpszMsg, 
                     HWND hCtrl, 
                     HWND hParent,
                     HINSTANCE hInstance,
                     UINT nIcon = TTI_INFO,
                     BOOL bUseBalloonTips = TRUE,
                     UINT nTimeOutSeconds = 0,
                     LPRECT pRect = NULL);
    static void Destroy();

// Implementation
protected:
    static LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);
    static LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam);
    static LRESULT __stdcall DefWindowProcX(HWND hWnd,
                                UINT message,
                                WPARAM wParam,
                                LPARAM lParam);
    static void CALLBACK TimerProcX(HWND hwnd,
                                UINT message,
                                UINT_PTR nIdEvent,
                                DWORD dwTime);
    static BOOL GetEnableBalloonTips();
    static void GetStrings(LPCTSTR lpszTitle, LPCTSTR lpszMsg, HINSTANCE hInstance);
    static TCHAR * GetModuleName(HINSTANCE hInstance);
    static void PositionBalloon(LPRECT pRect, LPRECT pNewRect, BOOL bBalloon);

    static BOOL            m_bInit;            // TRUE = initialization finished
    static BOOL            m_bUseBalloonTips;    // TRUE = use balloon tips if possible
    static BOOL            m_bBalloon;            // TRUE = balloon tips not disallowed in 
                                            // registry
    static HINSTANCE    m_hInstance;        // app instance
    static UINT            m_nIcon;            // icon to use
    static UINT            m_nLastMessage;        // last message received
    static UINT            m_nTimeOutSeconds;    // message timeout in seconds;
                                            // 0 = no timeout
    static UINT            m_nTimerId;            // timer id returned by SetTimer()
    static LPRECT        m_pRect;            // NULL = use control rect
    static HWND            m_hWnd;                // hwnd of CXBalloonMsg
    static HWND            m_hParent;            // parent hwnd
    static HWND            m_hCtrl;            // control hwnd
    static WNDPROC        m_wndProc;            // window proc for parent subclassing
    static HHOOK        m_hKeyboardHook;    // keyboard hook
    static HHOOK        m_hMouseHook;        // mouse hook
    static TCHAR        m_szTitle[500];        // title string
    static TCHAR        m_szMsg[4000];        // message string
};

实现代码
//=============================================================================
// class variables
//=============================================================================

BOOL    CXBalloonMsg::m_bInit = FALSE;//未初始化
BOOL    CXBalloonMsg::m_bUseBalloonTips = TRUE;//默认使用气泡效果
BOOL    CXBalloonMsg::m_bBalloon = TRUE;
HINSTANCE CXBalloonMsg::m_hInstance = 0;
UINT    CXBalloonMsg::m_nIcon = TTI_INFO;
UINT    CXBalloonMsg::m_nLastMessage = 0;
UINT    CXBalloonMsg::m_nTimeOutSeconds = 0;
UINT    CXBalloonMsg::m_nTimerId = 0;
LPRECT    CXBalloonMsg::m_pRect = 0;
HWND    CXBalloonMsg::m_hWnd = 0;
HWND    CXBalloonMsg::m_hParent = 0;
HWND    CXBalloonMsg::m_hCtrl = 0;
HWND    CXBalloonMsg::m_hWndBalloon = 0;
WNDPROC    CXBalloonMsg::m_wndProc = 0;
HHOOK    CXBalloonMsg::m_hKeyboardHook = 0;
HHOOK    CXBalloonMsg::m_hMouseHook = 0;
TCHAR    CXBalloonMsg::m_szTitle[] = { 0 };
TCHAR    CXBalloonMsg::m_szMsg[]   = { 0 };


//=============================================================================
CXBalloonMsg::CXBalloonMsg()
//=============================================================================
{
}

//=============================================================================
CXBalloonMsg::~CXBalloonMsg()
//=============================================================================
{
    if (m_wndProc && IsWindow(m_hParent))
        ::SetWindowLong(m_hParent, GWL_WNDPROC, (LONG)m_wndProc);//保存窗口处理过程
    m_wndProc = 0;
}

//=============================================================================
//
// Show()
//
// Purpose:     The Show() function creates, displays, and operates a 
//              balloon message box. The message box contains an 
//              application-defined message and title, a close button, 
//              and an optional icon.
//
// Parameters:  lpszTitle       - [in] Pointer to a null-terminated string 
//                                that contains the balloon message title.  
//                                If this parameter is NULL, no title and  
//                                no icon will be displayed.  The special 
//                                symbol LPCTSTR_DEFAULT_TITLE may be used;  
//                                it will cause the executable module name 
//                                to be displayed.
//              lpszMsg         - [in] Pointer to a null-terminated string 
//                                that contains the balloon message to be 
//                                displayed.  Must not be null.
//              hCtrl           - [in] Handle to the control that the 
//                                message is being displayed for. Must not 
//                                be null.
//              hParent         - [in] Handle to the parent window of the 
//                                control. Must not be null.
//              hInstance       - [in] Handle to the instance of the module 
//                                that contains the string resource.  May 
//                                be null if string resource is not used.
//              nIcon           - [in] Specifies the icon to associate with 
//                                the balloon message.
//              bUseBalloonTips - [in] Specifies whether balloon tips are 
//                                to be used to display the message. If 
//                                this parameter is TRUE, balloon tips will 
//                                be used unless disabled in the registry.  
//                                If this parameter is FALSE, regular 
//                                tooltips will be used, regardless of value 
//                                of registry key. If not present, this 
//                                parameter defaults to TRUE.
//              nTimeOutSeconds - [in] Specifies number of seconds before the
//                                balloon message is automatically closed. If
//                                this parameter is zero, the balloon message
//                                will not be automatically closed.  If not
//                                present, this parameter defaults to zero.
//              pRect           - [in] Pointer to a RECT struct that contains 
//                                position where balloon message is to be 
//                                displayed.  May be null if default position 
//                                should be used. If not present, this 
//                                parameter defaults to null.
//
// Returns:     None
//
void CXBalloonMsg::Show(LPCTSTR lpszTitle, 
                        LPCTSTR lpszMsg, 
                        HWND hCtrl, 
                        HWND hParent,
                        HINSTANCE hInstance,
                        UINT nIcon /**//*= TTI_INFO*/,
                        BOOL bUseBalloonTips /**//*= TRUE*/,
                        UINT nTimeOutSeconds /**//*= 0*/,
                        LPRECT pRect /**//*= NULL*/)
{
    _ASSERTE(lpszMsg);
    _ASSERTE(hCtrl);
    _ASSERTE(hParent);

    if (!lpszMsg || !hCtrl || !hParent)
    {
        TRACE(_T("ERROR - bad parameter\n"));
        return;
    }

    if (!IsWindow(hCtrl) || !IsWindow(hParent))
    {
        TRACE(_T("ERROR - not a valid window handle\n"));
        return;
    }

    Destroy();//销毁以前的

    m_hParent = hParent;
    m_hCtrl = hCtrl;
    m_hInstance = hInstance;
    m_nIcon = nIcon;
    m_pRect = pRect;
    m_bUseBalloonTips = bUseBalloonTips;
    m_nTimeOutSeconds = nTimeOutSeconds;
    m_nTimerId = 0;

    GetStrings(lpszTitle, lpszMsg, hInstance);//加载字符串

    // make sure there's a message
    _ASSERTE(m_szMsg[0] != _T('\0'));
    if (m_szMsg[0] == _T('\0'))
        return;

    m_bInit = FALSE;//初始化还未完成
    m_nLastMessage = 0;

    TCHAR * pszClassName = _T("XBalloonMsg");

    WNDCLASS wc =
    {
        CS_DBLCLKS,                        // class style - want WM_LBUTTONDBLCLK
        DefWindowProcX,                    // window proc
        0,                                // class extra bytes
        0,                                // window extra bytes
        hInstance,                        // instance handle
        0,                                // icon
        ::LoadCursor(0, IDC_ARROW),        // cursor
        0,                                // background brush
        0,                                // menu name
        pszClassName                    // class name
    };

    if (!::RegisterClass(&wc))
    {//注册窗口类
        DWORD dwLastError = GetLastError();
        if (dwLastError != ERROR_CLASS_ALREADY_EXISTS)
        {
            TRACE(_T("ERROR - RegisterClass failed, GetLastError() returned %u\n"), dwLastError);
            _ASSERTE(FALSE);
            return;
        }
    }

    m_hWnd = ::CreateWindowEx(0, pszClassName, _T(""), WS_POPUP | WS_VISIBLE, 
        30000, 30000, 10, 10,
        m_hParent, (HMENU)0, hInstance, 0);

    if (!m_hWnd)
    {
        TRACE(_T("ERROR - CreateWindowEx failed\n"));
        _ASSERTE(m_hWnd);
    }
    else
    {
        ::SetWindowPos(m_hParent, m_hWnd, 0, 0, 0, 0, 
            SWP_NOMOVE|SWP_NOSIZE);
    }
}

//=============================================================================
//
// Destroy()
//
// Purpose:     The Destroy() function removes the balloon tip from the
//              screen and destroys the tooltip window.
//
// Parameters:  None
//
// Returns:     None
//
void CXBalloonMsg::Destroy()
{
    TRACE(_T("in CXBalloonMsg::Destroy\n"));

    if (m_nTimerId)
        ::KillTimer(0, m_nTimerId);
    m_nTimerId = 0;

    if (m_wndProc && IsWindow(m_hParent))
        ::SetWindowLong(m_hParent, GWL_WNDPROC, (LONG)m_wndProc);
    m_wndProc = 0;

    if (IsWindow(m_hWndBalloon))
    {
        ::SendMessage(m_hWndBalloon, TTM_POP, 0, 0);
        ::PostMessage(m_hWndBalloon, WM_CLOSE, 0, 0);
    }
    m_hWndBalloon = 0;

    if (IsWindow(m_hWnd))
        ::DestroyWindow(m_hWnd);
}

//=============================================================================
//
// KeyboardProc()
//
// Purpose:     Callback function set by the SetWindowsHookEx() function.
//              The system calls this function whenever an application 
//              calls the GetMessage or PeekMessage function and there is a
//              keyboard message (WM_KEYUP or WM_KEYDOWN) to be processed. 
//
// Parameters:  nCode  - hook code
//              wParam - virtual-key code
//              lParam - keystroke-message information
//
// Returns:     LRESULT - 1 to prevent the system from passing the message on;
//                        or the return value from CallNextHookEx().
//
LRESULT CALLBACK CXBalloonMsg::KeyboardProc(int nCode, 
                                            WPARAM wParam, 
                                            LPARAM lParam)
{
    if ((nCode >= 0) && 
        ((lParam & 0x80000000) == 0) &&        // ignore key releases
        (wParam != VK_CONTROL) &&
        (wParam != VK_SHIFT) &&
        (wParam != VK_MENU))
    {
        LRESULT rc = 1;

        if (wParam == VK_ESCAPE ||
            wParam == VK_RETURN ||
            wParam == VK_TAB ||
            wParam == VK_LEFT ||
            wParam == VK_UP ||
            wParam == VK_RIGHT ||
            wParam == VK_DOWN ||
            ((wParam >= VK_F1) && (wParam <= VK_F24))
            )
        {
            // don't forward these keystrokes
        }
        else
        {
            rc = CallNextHookEx(m_hKeyboardHook, nCode, wParam, lParam);
        }
        Destroy();
        return rc;
    }

    return CallNextHookEx(m_hKeyboardHook, nCode, wParam, lParam);
}

//=============================================================================
//
// MouseProc()
//
// Purpose:     Callback function set by the SetWindowsHookEx() function.
//              The system calls this function whenever an application 
//              calls the GetMessage or PeekMessage function and there is a
//              mouse message to be processed. 
//
// Parameters:  nCode  - hook code
//              wParam - message identifier
//              lParam - mouse coordinates
//
// Returns:     LRESULT - the return value from CallNextHookEx().
//
LRESULT CALLBACK CXBalloonMsg::MouseProc(int nCode, 
                                         WPARAM wParam, 
                                         LPARAM lParam)
{
    LRESULT rc =  CallNextHookEx(m_hMouseHook, nCode, wParam, lParam);

    if (nCode >= 0)
    {
        if (wParam == WM_LBUTTONDOWN ||
            wParam == WM_RBUTTONDOWN ||
            wParam == WM_MBUTTONDOWN ||
            wParam == WM_NCLBUTTONDOWN ||
            wParam == WM_NCRBUTTONDOWN ||
            wParam == WM_NCMBUTTONDOWN ||
            wParam == WM_MOUSEWHEEL)
        {
            Destroy();
        }
    }

    return rc;
}

//=============================================================================
//
// TimerProcX()
//
// Purpose:     Callback function that processes WM_TIMER messages.  It is set
//              by SetTimer() if caller has specified a message timeout.
//
// Parameters:  hwnd     - handle to window
//              message  - WM_TIMER message
//              nIdEvent - timer identifier
//              dwTime   - current system time
//
// Returns:     None
//
void CALLBACK CXBalloonMsg::TimerProcX(HWND /**//*hwnd*/, 
                                       UINT /**//*message*/,
                                       UINT_PTR /**//*nIdEvent*/,
                                       DWORD /**//*dwTime*/)
{
    Destroy();
}

//=============================================================================
//
// DefWindowProcX()
//
// Purpose:     Window proc to dispatch messages for CXBalloonMsg.  Also 
//              used to subclass parent window to trap UI messages.
//
// Parameters:  Standard windows message parameters.
//
// Returns:     LRESULT - The return value is the result of the message 
//                        processing and depends on the message.
//
LRESULT __stdcall CXBalloonMsg::DefWindowProcX(HWND hWnd,
                                               UINT message,
                                               WPARAM wParam,
                                               LPARAM lParam)
{
    switch (message)
    {
        case WM_DESTROY:
            if (m_hKeyboardHook)
                ::UnhookWindowsHookEx(m_hKeyboardHook);//卸载键盘钩子
            m_hKeyboardHook = 0;

            if (m_hMouseHook)
                ::UnhookWindowsHookEx(m_hMouseHook);//卸载鼠标钩子
            m_hMouseHook = 0;

            if (IsWindow(m_hParent))
            {
                ::UpdateWindow(m_hParent);//通知父窗口刷新

                // check if another app now is active
                if (m_nLastMessage == WM_ACTIVATE)
                {
                    // this restores "active caption" to parent
                    ::SetWindowPos(m_hParent, 0, 0, 0, 0, 0, 
                        SWP_DRAWFRAME|SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE);
                }
            }
            break;

        case WM_WINDOWPOSCHANGED:
        {
            if (!m_bInit && (m_hWndBalloon == 0))
            {
                DWORD dwStyle = WS_POPUP | WS_VISIBLE | TTS_ALWAYSTIP | TTS_NOPREFIX | 
                                TTS_CLOSE | TTS_NOFADE | TTS_NOANIMATE;
                m_bBalloon = GetEnableBalloonTips();
                if (m_bBalloon && m_bUseBalloonTips)
                    dwStyle |= TTS_BALLOON;

                m_hWndBalloon = ::CreateWindowEx(0, TOOLTIPS_CLASS, 0, dwStyle,
                    CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
                    m_hParent, 0, 0, 0);

                _ASSERTE(m_hWndBalloon);

                if (m_hWndBalloon)
                {
                    if (m_wndProc == 0 && IsWindow(m_hParent))
                    {
                        m_wndProc = (WNDPROC)::SetWindowLong(m_hParent, GWL_WNDPROC, (LONG)DefWindowProcX);
                        if (m_wndProc)
                        {
                            TRACE(_T("parent successfully subclassed\n"));
                        }
                        else
                        {
                            TRACE(_T("ERROR - parent subclass failed\n"));
                        }
                    }

                    TOOLINFO ti;
                    ::ZeroMemory(&ti, sizeof(ti));
                    ti.cbSize   = sizeof(ti);
                    // using TTF_TRACK causes balloon to be displayed underneath control
                    ti.uFlags   = TTF_TRACK;
                    if (m_bBalloon && m_bUseBalloonTips)
                        ti.uFlags |= TTF_CENTERTIP;
                    ti.hwnd     = m_hParent;
                    ti.lpszText = (LPTSTR)m_szMsg;
                    ti.uId      = 10001;
                    ti.hinst    = m_hInstance;

                    if (IsWindow(m_hWndBalloon))
                    {
                        ::SendMessage(m_hWndBalloon, TTM_SETMAXTIPWIDTH, 0, 32000);
                        ::SendMessage(m_hWndBalloon, TTM_SETDELAYTIME, TTDT_AUTOPOP, MAKELONG(1,0));
                        ::SendMessage(m_hWndBalloon, TTM_SETDELAYTIME, TTDT_INITIAL, MAKELONG(1,0));
                        ::SendMessage(m_hWndBalloon, TTM_SETDELAYTIME, TTDT_RESHOW,  MAKELONG(1,0));
                        ::SendMessage(m_hWndBalloon, TTM_ADDTOOL, 0, (LPARAM) &ti);
                        ::SendMessage(m_hWndBalloon, TTM_SETTITLE, (WPARAM)m_nIcon, (LPARAM)m_szTitle);

                        RECT rectTip;
                        PositionBalloon(m_pRect, &rectTip, m_bBalloon & m_bUseBalloonTips);

                        ::SendMessage(m_hWndBalloon, TTM_TRACKPOSITION, (WPARAM)0, 
                            (LPARAM)MAKELONG(rectTip.left, rectTip.top));

                        ::SendMessage(m_hWndBalloon, TTM_TRACKACTIVATE, (WPARAM)TRUE, (LPARAM)&ti);

                        if (!m_hKeyboardHook)
                        {
                            m_hKeyboardHook = ::SetWindowsHookEx(WH_KEYBOARD,
                                                    KeyboardProc,
                                                    NULL, ::GetCurrentThreadId());
                            _ASSERTE(m_hKeyboardHook);
                        }

                        if (!m_hMouseHook)
                        {
                            m_hMouseHook = ::SetWindowsHookEx(WH_MOUSE,
                                                    MouseProc,
                                                    NULL, ::GetCurrentThreadId());
                            _ASSERTE(m_hMouseHook);
                        }

                        if (m_nTimeOutSeconds)
                        {
                            m_nTimerId = ::SetTimer(0, 1, m_nTimeOutSeconds*1000, TimerProcX);
                        }

                        m_bInit = TRUE;
                    }
                }
            }
            return 0;
            break;
        }

        case WM_ACTIVATE:
            // lParam will be zero if another app is now active
            m_nLastMessage = (lParam != 0) ? WM_ACTIVATE : 0;

        case WM_KILLFOCUS:
        case WM_MENUCOMMAND:
        case WM_SYSCOMMAND:
        case WM_MOUSEACTIVATE:
        case WM_ENTERMENULOOP:
        case WM_HSCROLL:
        case WM_VSCROLL:
            TRACE(_T("potential terminating message 0x%X\n"), message);

            if (m_bInit && IsWindow(m_hWnd) && IsWindow(m_hWndBalloon))
            {
                // remove tip from screen
                Destroy();
            }
            return 0;
            break;
    };

    if (hWnd == m_hParent)
    {
        if (m_wndProc && IsWindow(m_hParent))
            return (*m_wndProc)(hWnd, message, wParam, lParam);
        else
            return 0;
    }
    else
    {
        if (IsWindow(hWnd))
            return ::DefWindowProc(hWnd, message, wParam, lParam);
        else
            return 0;
    }
}

//=============================================================================
//
// GetEnableBalloonTips()
//
// Purpose:     The GetEnableBalloonTips() function retrieves the value of
//              the registry key EnableBalloonTips.
//
// Parameters:  None
//
// Returns:     BOOL - TRUE = key value is non-zero, or key does not exist;
//                     FALSE = key value is zero.
//
BOOL CXBalloonMsg::GetEnableBalloonTips()
{
    BOOL rc = TRUE;        // assume balloon tips are enabled
    HKEY hkey = 0;
    if (RegOpenKeyEx(HKEY_CURRENT_USER,
            _T("Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Advanced"),
            0, KEY_QUERY_VALUE, &hkey) == ERROR_SUCCESS)
    {
        DWORD dwEnable = 0;
        DWORD dwSize = sizeof(DWORD);
        if (RegQueryValueEx(hkey, _T("EnableBalloonTips"), 0, 0,
            (LPBYTE) &dwEnable, &dwSize) == ERROR_SUCCESS)
        {
            rc = dwEnable != 0;
        }
        RegCloseKey(hkey);
    }

    return rc;
}

//=============================================================================
//
// GetStrings()
//
// Purpose:     The GetStrings() function sets the class variables m_szMsg 
//              and m_szTitle.
//
// Parameters:  lpszTitle - [in] pointer to title string or resource id;  may
//                          be NULL or special symbol LPCTSTR_DEFAULT_TITLE.
//              lpszMsg   - [in] pointer to message string or resource id; 
//                          must not be NULL.
//              hInstance - [in] app instance handle
//
// Returns:     None
//
void CXBalloonMsg::GetStrings(LPCTSTR lpszTitle, LPCTSTR lpszMsg, HINSTANCE hInstance)
{
    // get message and title - they may be pointers to strings or resource IDs

    memset(m_szMsg, 0, sizeof(m_szMsg));
    memset(m_szTitle, 0, sizeof(m_szTitle));

    // is the message a string or a resource id?
    if (HIWORD(lpszMsg) == 0)
    {
        // id
        UINT nID = LOWORD((UINT)(UINT_PTR)lpszMsg);
        if (!::LoadString(hInstance, nID, m_szMsg, sizeof(m_szMsg)/sizeof(TCHAR)-2))
        {
            TRACE(_T("ERROR - failed to load message string %d\n"), nID);
            _ASSERTE(FALSE);
        }
    }
    else
    {
        // string
        _tcsncpy(m_szMsg, lpszMsg, sizeof(m_szMsg)/sizeof(TCHAR)-2);
    }

#ifdef _DEBUG
    size_t nLen = _tcslen(m_szMsg);
    size_t nBufLen = sizeof(m_szMsg)/sizeof(TCHAR);
    if (nLen > (nBufLen - nBufLen/10))
    {
        TRACE(_T("WARNING - message size near maximum of %d\n"), nBufLen);
    }
#endif

    if (lpszTitle == LPCTSTR_DEFAULT_TITLE)
    {//默认标题是模块名称
        // set title to module name
        _tcsncpy(m_szTitle, GetModuleName(hInstance), 
            sizeof(m_szTitle)/sizeof(TCHAR)-2);
    }
    else if (lpszTitle)        // title is optional
    {
        // is the title a string or an id?
        if (HIWORD(lpszTitle) == 0)
        {
            // id
            UINT nID = LOWORD((UINT)(UINT_PTR)lpszTitle);
            if (!::LoadString(hInstance, nID, m_szTitle, sizeof(m_szTitle)/sizeof(TCHAR)-2))
            {
                TRACE(_T("ERROR - failed to load title string %d\n"), nID);
                _ASSERTE(FALSE);
            }
        }
        else
        {
            // string
            _tcsncpy(m_szTitle, lpszTitle, sizeof(m_szTitle)/sizeof(TCHAR)-2);
        }
    }

#ifdef _DEBUG
    nLen = _tcslen(m_szTitle);
    nBufLen = sizeof(m_szTitle)/sizeof(TCHAR);
    if (nLen > (nBufLen - nBufLen/10))
    {
        TRACE(_T("WARNING - title size near maximum of %d\n"), nBufLen);
    }
#endif
}

//=============================================================================
//
// GetModuleName()
//
// Purpose:     The GetModuleName() function returns the executable module
//              name.
//
// Parameters:  hInstance - [in] app instance handle
//
// Returns:     TCHAR *   - pointer to name (static)
//
TCHAR * CXBalloonMsg::GetModuleName(HINSTANCE hInstance)
{
    static TCHAR szName[MAX_PATH*2];
    szName[0] = _T('\0');
    ::GetModuleFileName(hInstance, szName, sizeof(szName)/sizeof(TCHAR)-2);
    szName[sizeof(szName)/sizeof(TCHAR)-1] = _T('\0');
    TCHAR *cp = _tcsrchr(szName, _T('\\'));
    if (cp)
    {
        _tcscpy(&szName[0], cp+1);
    }
    cp = _tcsrchr(szName, _T('.'));
    if (cp)
    {
        *cp = _T('\0');
    }
    return szName;
}

//=============================================================================
//
// PositionBalloon()
//
// Purpose:     The PositionBalloon() function returns the rect for the 
//              message balloon.
//
// Parameters:  pRect    - [in] optional pointer to caller-specified RECT;
//                         may be NULL.
//              pNewRect - [out] pointer to RECT that receives balloon 
//                         location (left and top values only are vaild).
//              bBalloon - [in] TRUE = balloon will be displayed;  
//                         FALSE = regular tooltip will be displayed.
//
// Returns:     None
//
void CXBalloonMsg::PositionBalloon(LPRECT pRect, LPRECT pNewRect, BOOL bBalloon)
{
    RECT rect = { 0 };

    if (pRect)
    {
        // use specified position
        rect = *pRect;
    }
    else
    {
        // use control position
        RECT rectCtrl = { 0 };
        if (IsWindow(m_hCtrl))
            ::GetWindowRect(m_hCtrl, &rectCtrl);

        rect = rectCtrl;
        rect.top  = rectCtrl.bottom;

        if (bBalloon)
        {
            rect.left = rectCtrl.left + (rectCtrl.right-rectCtrl.left)/2;
            rect.top  = rectCtrl.top +  (rectCtrl.bottom-rectCtrl.top)/2;
        }
    }

    _ASSERTE(pNewRect);
    if (pNewRect)

        *pNewRect = rect;
}

显示API详解

      Show函数创建，显示并操作一个气泡状的消息对话框。这个消息对话框包含一个消息字段和标题，一个关闭按钮，和一个可选的图标。
 

void Show(

LPCTSTR lpszTitle,
LPCTSTR lpszMsg,
HWND hCtrl,
HWND hParent,
HINSTANCE hInstance,
UINT nIcon = TTI_INFO,
BOOL bUseBalloonTips = TRUE,
UINT nTimeOutSeconds = 0,
LPRECT pRect = NULL

);

Parameters

lpszTitle

[in] Pointer to a null-terminated string that contains the balloon message title. If this parameter is NULL, no title and no icon will be displayed. The special symbol LPCTSTR_DEFAULT_TITLE may be used; it will cause the executable module name to be displayed.

lpszMsg

[in] Pointer to a null-terminated string that contains the balloon message to be displayed. Must not be null. Text callbacks (LPSTR_TEXTCALLBACK) are not used, so the text string can be as long as you want, up to the size of the internal text buffer m_szMsg.

hCtrl

[in] Handle to the control that the message is being displayed for. Must not be null.

hParent

[in] Handle to the parent window of the control. Must not be null.

hInstance

[in] Handle to the instance of the module that contains the string resource. May be null if string resource is not used.

nIcon

[in] Specifies the icon to associate with the balloon message. This can be one of the following values:

Value	Meaning
TTI_ERROR	Use the error icon
TTI_INFO	Use the information icon
TTI_NONE	Use no icon
TTI_WARNING	Use the warning icon

This parameter may also be the handle of an icon obtained from LoadIcon or LoadImage functions. If not present, this parameter defaults to TTI_INFO.

bUseBalloonTips

[in] Specifies whether balloon tips are to be used to display the message. If this parameter is TRUE, balloon tips will be used unless disabled in the registry. If this parameter is FALSE, regular tooltips will be used, regardless of value of registry key. If not present, this parameter defaults to TRUE.

nTimeOutSeconds

[in] Specifies the number of seconds before the balloon message is automatically closed. If this parameter is zero, the balloon message will not be automatically closed. If not present, this parameter defaults to zero.

pRect

[in] Pointer to a RECT struct that contains position where balloon message is to be displayed. May be null if default position should be used. If not present, this parameter defaults to null.