[Windows Mobile Development and Hacking General] RStein:
Hello skk ;)

What about notification API?

Here is the solution (simple concept) for Your problem. Interesting parts are in bold.

SNapiTest.cpp

#include "stdafx.h"
#include "SNapiTest.h"
#include <windows.h>
#include <commctrl.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE	g_hInst;	// current instance
HWND	g_hWndMenuBar;	// menu bar handle

[b]
const DWORD WM_WIFISTATUS = WM_USER + 1;
bool g_connecting;
bool g_connected;
HREGNOTIFY g_hNotify;
HREGNOTIFY g_hNotify2;
[/b]

// Forward declarations of functions included in this code module:
ATOM	MyRegisterClass(HINSTANCE, LPTSTR);
BOOL	InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
MSG msg;

// Perform application initialization:
if (!InitInstance(hInstance, nCmdShow))
{
return FALSE;
}

HACCEL hAccelTable;
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_SNAPITEST));

// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return (int) msg.wParam;
}

//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
ATOM MyRegisterClass(HINSTANCE hInstance, LPTSTR szWindowClass)
{
WNDCLASS wc;

wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_SNAPITEST));
wc.hCursor = 0;
wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = 0;
wc.lpszClassName = szWindowClass;

return RegisterClass(&wc);
}

//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
TCHAR szTitle[MAX_LOADSTRING];	// title bar text
TCHAR szWindowClass[MAX_LOADSTRING];	// main window class name

g_hInst = hInstance; // Store instance handle in our global variable

// SHInitExtraControls should be called once during your application's initialization to initialize any
// of the device specific controls such as CAPEDIT and SIPPREF.
SHInitExtraControls();

LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_SNAPITEST, szWindowClass, MAX_LOADSTRING);

//If it is already running, then focus on the window, and exit
hWnd = FindWindow(szWindowClass, szTitle);
if (hWnd)
{
// set focus to foremost child window
// The "| 0x00000001" is used to bring any owned windows to the foreground and
// activate them.
SetForegroundWindow((HWND)((ULONG) hWnd | 0x00000001));
return 0;
}

if (!MyRegisterClass(hInstance, szWindowClass))
{
return FALSE;
}

hWnd = CreateWindow(szWindowClass, szTitle, WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

// When the main window is created using CW_USEDEFAULT the height of the menubar (if one
// is created is not taken into account). So we resize the window after creating it
// if a menubar is present
if (g_hWndMenuBar)
{
RECT rc;
RECT rcMenuBar;

GetWindowRect(hWnd, &rc);
GetWindowRect(g_hWndMenuBar, &rcMenuBar);
rc.bottom -= (rcMenuBar.bottom - rcMenuBar.top);

MoveWindow(hWnd, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top, FALSE);
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND	- process the application menu
// WM_PAINT	- Paint the main window
// WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;

static SHACTIVATEINFO s_sai;

switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_HELP_ABOUT:
DialogBox(g_hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, About);
break;
case IDM_OK:
SendMessage (hWnd, WM_CLOSE, 0, 0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_CREATE:
SHMENUBARINFO mbi;

memset(&mbi, 0, sizeof(SHMENUBARINFO));
mbi.cbSize = sizeof(SHMENUBARINFO);
mbi.hwndParent = hWnd;
mbi.nToolBarId = IDR_MENU;
mbi.hInstRes = g_hInst;

if (!SHCreateMenuBar(&mbi))
{
g_hWndMenuBar = NULL;
}
else
{
g_hWndMenuBar = mbi.hwndMB;
}

// Initialize the shell activate info structure
memset(&s_sai, 0, sizeof (s_sai));
s_sai.cbSize = sizeof (s_sai);

[b]

g_connecting = false;
g_connected = false;
{HRESULT hr = RegistryNotifyWindow(SN_WIFISTATECONNECTING_ROOT,
SN_WIFISTATECONNECTING_PATH, SN_WIFISTATECONNECTING_VALUE,
hWnd, WM_WIFISTATUS, 0, NULL, &g_hNotify);}
{HRESULT hr2 = RegistryNotifyWindow(SN_WIFISTATECONNECTING_ROOT,
SN_WIFISTATECONNECTED_PATH, SN_WIFISTATECONNECTED_VALUE,
hWnd, WM_WIFISTATUS, 0, NULL, &g_hNotify2);}
[/b]
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);

// TODO: Add any drawing code here...

EndPaint(hWnd, &ps);
break;

[b]
case WM_WIFISTATUS:
{
DWORD newValue = (DWORD) wParam;
WCHAR caption[] = L"Wifi Status";

if ((newValue & SN_WIFISTATECONNECTED_BITMASK) == SN_WIFISTATECONNECTED_BITMASK)
{
if (!g_connected)
{

g_connected = true;
g_connecting = false;
MessageBox(hWnd, L"Connected!!", caption, MB_OK);
}

break;
}

if ((newValue & SN_WIFISTATECONNECTING_BITMASK) == SN_WIFISTATECONNECTING_BITMASK)
{
if (!g_connecting)
{
g_connecting = true;
g_connected =false;

MessageBox(hWnd, L"Connecting...", caption, MB_OK);

}
}

break;
}

[/b]

case WM_DESTROY:
CommandBar_Destroy(g_hWndMenuBar);
[B]
RegistryCloseNotification(g_hNotify);
RegistryCloseNotification(g_hNotify2);
[/B]
PostQuitMessage(0);
break;

case WM_ACTIVATE:
// Notify shell of our activate message
SHHandleWMActivate(hWnd, wParam, lParam, &s_sai, FALSE);
break;
case WM_SETTINGCHANGE:
SHHandleWMSettingChange(hWnd, wParam, lParam, &s_sai);
break;

default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
{
// Create a Done button and size it.
SHINITDLGINFO shidi;
shidi.dwMask = SHIDIM_FLAGS;
shidi.dwFlags = SHIDIF_DONEBUTTON | SHIDIF_SIPDOWN | SHIDIF_SIZEDLGFULLSCREEN | SHIDIF_EMPTYMENU;
shidi.hDlg = hDlg;
SHInitDialog(&shidi);
}
return (INT_PTR)TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;

case WM_CLOSE:
EndDialog(hDlg, message);
return TRUE;

}
return (INT_PTR)FALSE;
}

Needed includes:

// TODO: reference additional headers your program requires here

#include <snapi.h>

#include <regext.h>