API NotifyIcon WinAPI，不显示消息

我正在使用 NotifyIcon API 来显示消息（Baloon 或 Win 10 上的通知）。问题是消息没有显示在屏幕上。返回值始终为true，最后一条错误信息为0（不过，我知道Shell_NotifyIcon函数调用了SetLastError(0)，所以无法得到错误信息）。我创建了一个最小的示例来演示我需要的功能：

1. 创建一个简单的窗口并将其添加到通知区域（系统托盘）+显示相应的消息（未显示）
2. 创建一个右键单击通知区域中的图标时调用的上下文菜单
3. 该菜单包含一个单击按钮，该按钮根据其状态显示/隐藏窗口，并且再次尝试显示一条消息（不显示，仅此而已）
4. 当窗口关闭时，通知区域的图标被销毁，即 从中移除

另外，我添加了一个控制台，其中写入了返回值\u200b\u200bare（为方便起见）。这是示例代码：

#define _CRT_SECURE_NO_WARNINGS

#include <Windows.h>
#include <iostream>

using namespace std;

#define MENU_TEST 10
#define RBUTTON_MENU WM_USER + 3000


void showMessage(HWND hwnd, const wchar_t* mes, int flag);
LRESULT CALLBACK wndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    SetConsoleOutputCP(1251);
    SetConsoleCP(1251);

    if (!AllocConsole())
        return -1;
    wcout.imbue(locale("rus_rus.866")); 
    wcin.imbue(locale("rus_rus.866")); 
    _wfreopen(L"CONOUT$", L"wt", stdout); 
    _wfreopen(L"CONIN$", L"rt", stdin); 

    HWND hwnd;
    MSG msg; 
    WNDCLASSEX wc; 
    wc.cbSize = sizeof(wc); 
    wc.style = CS_HREDRAW | CS_VREDRAW; 
    wc.lpfnWndProc = wndProc; 
    wc.lpszMenuName = NULL; 
    wc.lpszClassName = L"test__class"; 
    wc.cbWndExtra = NULL; 
    wc.cbClsExtra = NULL; 
    wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); 
    wc.hIconSm = LoadIcon(NULL, IDI_WINLOGO); 
    wc.hCursor = LoadCursor(NULL, IDC_ARROW); 
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); 
    wc.hInstance = hInstance; 
    if (!RegisterClassEx(&wc)) 
        return -1; 

    hwnd = CreateWindow(L"test__class",     L"Test Notify", WS_OVERLAPPEDWINDOW | WS_VSCROLL, CW_USEDEFAULT, NULL, CW_USEDEFAULT, NULL, (HWND)NULL, NULL, HINSTANCE(hInstance), NULL); 
    if (!hwnd)
        return -1;

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);
    while (GetMessage(&msg, NULL, NULL, NULL))
    { 
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
    }
    return msg.wParam; 
}

void showMessage(HWND hwnd, const wchar_t* mes, int flag)
{
    NOTIFYICONDATA nid;
    static const GUID name  = { 0xaaaad36f, 0xd48a, 0x4306, { 0x84, 0x45, 0x73, 0x84, 0xc9, 0xf1, 0x3f, 0xa0 } };
    memset(&nid, 0, sizeof(NOTIFYICONDATA));
    nid.cbSize = sizeof(NOTIFYICONDATA);
    nid.hWnd = hwnd;
    nid.guidItem = name;
    nid.uID = 7;
    nid.uFlags = NIF_INFO | NIF_STATE | NIF_ICON | NIF_TIP | NIF_MESSAGE;
    nid.uCallbackMessage = RBUTTON_MENU;
    wcscpy_s(nid.szInfo, mes);
    nid.dwInfoFlags = NIIF_NOSOUND; 
    wcscpy_s(nid.szTip, L"Test");
    wcout << L"Message: " << mes << endl;
    wcout << L"Result function NotifyIcon: " << Shell_NotifyIcon(flag, &nid) << endl;
    wcout << L"Last error: " << GetLastError() << endl;
}

LRESULT CALLBACK wndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{
    static HMENU hMenu;

    switch (uMsg) 
    {

    case WM_CREATE: 
    {
        hMenu = CreatePopupMenu();
        AppendMenuA(hMenu, MF_STRING, MENU_TEST, "Click");
        showMessage(hwnd, L"App started", NIM_ADD);
        break;
    }

    case RBUTTON_MENU:
    {
        switch (lParam)
        {
        case WM_RBUTTONUP:
        {
            SetForegroundWindow(hwnd);
            POINT pt;
            GetCursorPos(&pt); 
            TrackPopupMenu(hMenu, TPM_LEFTALIGN | TPM_RIGHTBUTTON, pt.x, pt.y, 0, hwnd, NULL);
            break;
        }
        default:
            break;
        }
    }
    case WM_COMMAND:
    {
        switch (LOWORD(wParam))
        {
        case MENU_TEST: 
        {
            bool visible = IsWindowVisible(hwnd);
            ShowWindow(hwnd, !visible ? SW_SHOW :SW_HIDE);
            showMessage(hwnd, !visible ? L"App restored" : L"App minimazed", NIM_MODIFY);
            break;
        }
        default: break;
        }
        break;
    }

    case WM_DESTROY: 
        showMessage(hwnd, L"App closed", NIM_DELETE);
        DestroyMenu(hMenu);
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }

}

为什么会这样？该消息顽固地没有出现..谢谢。