There's no tip when use Shell_NotifyIcon?

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C++

I am trying to add an icon to notification area.I see the article which URL is Basic use of Shell_NotifyIcon in Win32[^] and try to write code according to it.But I find that my code cannot show the tip.Here's my code.I hope someone can help me.
By the way,sorry for my poor English.
Thanks..

// StealthDlg.cpp : 定义应用程序的入口点。
//
#include "stdafx.h"
#include "StealthDlg.h"
#define MAX_LOADSTRING 100
#define TRAY_ICON_ID 1
#define SWM_TRAYMSG WM_APP
#define SWM_SHOW	WM_APP + 1
#define SWM_HIDE	WM_APP + 2
#define SWM_EXIT	WM_APP + 3
// 全局变量:
HINSTANCE hInst;								// 当前实例
NOTIFYICONDATA niData;
// 此代码模块中包含的函数的前向声明:
BOOL				InitInstance(HINSTANCE, int);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	DlgProc(HWND, UINT, WPARAM, LPARAM);
BOOL				OnInitDialog( HWND hwnd );
ULONGLONG			GetDllVersion( LPCTSTR lpszDllName );
VOID				ShowContextMenu( HWND hwnd );
int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);
 	// TODO: 在此放置代码。
	MSG msg;
	HACCEL hAccelTable;
	// 执行应用程序初始化:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}
	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_STEALTHDLG));
	// 主消息循环:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if ( !TranslateAccelerator(msg.hwnd, hAccelTable, &msg) || !IsDialogMessage(msg.hwnd,&msg) )
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return (int) msg.wParam;
}
//
//   函数: InitInstance(HINSTANCE, int)
//
//   目的: 保存实例句柄并创建主窗口
//
//   注释:
//
//        在此函数中，我们在全局变量中保存实例句柄并
//        创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
/*	INITCOMMONCONTROLSEX initCommCtl;
	initCommCtl.dwSize = sizeof(initCommCtl);
	initCommCtl.dwICC = ICC_STANDARD_CLASSES;
	InitCommonControlsEx( &initCommCtl );*/
    hInst = hInstance; // 将实例句柄存储在全局变量中
    HWND hWnd = CreateDialog( hInst,MAKEINTRESOURCE(IDD_STEALTHDLG_DIALOG),NULL,(DLGPROC)DlgProc );
    if (!hWnd)
    {
       return FALSE;
    }
	ZeroMemory( &niData,sizeof(NOTIFYICONDATA) );
	ULONGLONG ullVersion = GetDllVersion(_T("Shell32.dll"));
	if ( ullVersion >= MAKEDLLVERULL(6,0,6,0) )
	{
		niData.cbSize = sizeof(NOTIFYICONDATA);
	}
	else /*if ( ullVersion == MAKEDLLVERULL(6,0,0,0) )*/
	{
		niData.cbSize = NOTIFYICONDATA_V2_SIZE;
	}
	niData.hWnd = hWnd;
	niData.uID = TRAY_ICON_ID;
	niData.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
	niData.hIcon = (HICON)LoadImage( hInst,MAKEINTRESOURCE(IDI_STEALTHDLG),IMAGE_ICON,
		GetSystemMetrics(SM_CXSMICON),GetSystemMetrics(SM_CYSMICON),LR_DEFAULTCOLOR );
	niData.uCallbackMessage = SWM_TRAYMSG;
	lstrcpyn( niData.szInfo,_T("Hers's the test for Shell_NotifyIcon."),sizeof(niData.szInfo)/sizeof(TCHAR) );
	Shell_NotifyIcon( NIM_ADD,&niData );
	if ( niData.hIcon && DestroyIcon(niData.hIcon) )
	{
		niData.hIcon = NULL;
	}
	ShowWindow( hWnd,SW_SHOW );
    return TRUE;
}
// "关于"框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(lParam);
	switch (message)
	{
	case WM_INITDIALOG:
		return (INT_PTR)TRUE;
	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
		{
			EndDialog(hDlg, LOWORD(wParam));
			return (INT_PTR)TRUE;
		}
		break;
	}
	return (INT_PTR)FALSE;
}
INT_PTR CALLBACK DlgProc( HWND hwndDlg,UINT uMsg,WPARAM wParam,LPARAM lParam )
{
	switch( uMsg )
	{
	case SWM_TRAYMSG:
		switch( lParam )
		{
		case WM_LBUTTONDBLCLK:
			ShowWindow( hwndDlg,SW_RESTORE );
			break;
		case WM_RBUTTONDOWN:
		case WM_CONTEXTMENU:
			ShowContextMenu(hwndDlg);
		}
		break;
	case WM_SYSCOMMAND:
		if ( ( wParam & 0xFFF0 ) == SC_MINIMIZE )
		{
			ShowWindow( hwndDlg,SW_MINIMIZE );
			return 1;
		}
		else if ( wParam == IDM_ABOUT )
			DialogBox( hInst,MAKEINTRESOURCE(IDD_ABOUTBOX),hwndDlg,(DLGPROC)About );
		break;
	case WM_COMMAND:
		switch( LOWORD(wParam) )
		{
		case SWM_SHOW:
			ShowWindow( hwndDlg,SW_RESTORE );
			break;
		case SWM_HIDE:
		case IDOK:
			ShowWindow( hwndDlg,SW_HIDE );
			break;
		case SWM_EXIT:
			DestroyWindow( hwndDlg );
			break;
		case IDM_ABOUT:
			DialogBox( hInst,MAKEINTRESOURCE(IDD_ABOUTBOX),hwndDlg,(DLGPROC)About );
			break;
		}
		return 1;
	case WM_INITDIALOG:
		return OnInitDialog( hwndDlg );
	case WM_CLOSE:
		DestroyWindow( hwndDlg );
		break;
	case WM_DESTROY:
		niData.uFlags = 0;
		Shell_NotifyIcon( NIM_DELETE,&niData );
		PostQuitMessage( 0 );
		break;
	}
	return 0;
}
BOOL OnInitDialog( HWND hwnd )
{
	HMENU hMenu = GetSystemMenu( hwnd,FALSE );
	if ( hMenu )
	{
		AppendMenu( hMenu,MF_SEPARATOR,0,NULL );
		AppendMenu( hMenu,MF_STRING,IDM_ABOUT,_T("About") );
	}
	HICON hBigIcon = (HICON)LoadImage( hInst,MAKEINTRESOURCE(IDI_STEALTHDLG),IMAGE_ICON,0,0,LR_SHARED|LR_DEFAULTSIZE);
	HICON hSmallIcon = (HICON)LoadImage( hInst,MAKEINTRESOURCE(IDI_SMALL),IMAGE_ICON,0,0,LR_DEFAULTSIZE );
	SendMessage( hwnd,WM_SETICON,ICON_BIG,(LPARAM)hBigIcon );
	SendMessage( hwnd,WM_SETICON,ICON_SMALL,(LPARAM)hSmallIcon );
	return TRUE;
}
ULONGLONG GetDllVersion( LPCTSTR lpszDllName )
{
	ULONGLONG ullVersion;
	HINSTANCE hInstDll;
	
	hInstDll = LoadLibrary( lpszDllName );
	if ( NULL != hInstDll )
	{
		DLLGETVERSIONPROC pDllGetVersion;
		pDllGetVersion = (DLLGETVERSIONPROC)GetProcAddress( hInstDll,"DllGetVersion" );
		if ( NULL != pDllGetVersion )
		{
			DLLVERSIONINFO dvi;
			HRESULT hr;
			ZeroMemory( &dvi,sizeof(DLLVERSIONINFO) );
			dvi.cbSize = sizeof(dvi);
			hr = (*pDllGetVersion)(&dvi);
			if ( SUCCEEDED(hr) )
			{
				ullVersion = MAKEDLLVERULL(dvi.dwMajorVersion,dvi.dwMinorVersion,dvi.dwBuildNumber,dvi.dwPlatformID);
			}
		}
		FreeLibrary( hInstDll );
	}
	else
	{
		return NULL;
	}
	return ullVersion;
}
VOID ShowContextMenu( HWND hwnd )
{
	HMENU hPopMenu = CreatePopupMenu();
	POINT pt;
	GetCursorPos( &pt );
	if ( hPopMenu != NULL )
	{
		if ( IsWindowVisible( hwnd ) )
		{
			InsertMenu( hPopMenu,-1,MF_BYPOSITION,SWM_HIDE,_T("Hide") );
		}
		else
		{
			InsertMenu( hPopMenu,-1,MF_BYPOSITION,SWM_SHOW,_T("Show") );
		}
		InsertMenu( hPopMenu,-1,MF_BYPOSITION,SWM_EXIT,_T("Exit") );
		SetForegroundWindow( hwnd );
		TrackPopupMenu( hPopMenu,TPM_BOTTOMALIGN,pt.x,pt.y,0,hwnd,NULL );
		DestroyMenu( hPopMenu );
	}
}