關于PPC Today界面(今日插件、PPC Today Screen),有兩個例程大家可以參考一下 ,一個是在Windows CE Tools\wce500\Windows Mobile 5.0 Pocket PC SDK\Samples\CPP\Win32下有Memwatcher的例子,另一個是網(wǎng)上的例子http://www.codeguru.com/cpp/wp/ce/pocketpc/article.php/c9269__1/.網(wǎng)上的那個例子其實和第一個沒什么區(qū)別，代碼也都差不多的，不過它能更詳細些。PPC Today界面上可以放應用程序的快捷方式或是按時更新的數(shù)據(jù)都可以。

關于PPC Today界面的調(diào)試，起初我將安裝包安裝后重啟，后來發(fā)現(xiàn)完全可以不必這樣，在SDK的WIN32的例子中有個Setupdll的程序，這個程序中的codeINSTALL_EXIT Install_Exit函數(shù)中除了注冊PPC Today界面以外，關鍵的是SendMessage(HWND_BROADCAST, WM_WININICHANGE, (WPARAM)0xF2, 0)，有了這一句我們立即就可以看到程序的效果。我們可以把安裝完后要執(zhí)行動作放到這個函數(shù)下（包括程序的啟動）,下面是這個函數(shù)的示例代碼：
codeINSTALL_EXIT Install_Exit(HWND hwndparent,
         LPCTSTR pszinstalldir,
         WORD cfaileddirs,
         WORD cfailedfiles,
         WORD cfailedregkeys,
         WORD cfailedregvals,
         WORD cfailedshortcuts)
{
 HKEY hOpenKey    = NULL;
 long lResult     = 0;
 DWORD dwOpenStyle    = 0;
 DWORD iValueType    = 0;
 DWORD iLen     = 0;
 DWORD iTemp     = 0;
 TCHAR szPath[MAX_PATH]  = {'\0'};
 TCHAR szLinkPath[MAX_PATH] = {0};
 TCHAR szAppPath[MAX_PATH]  = {0};
 
 LPCTSTR keyName  = _T("Software\\CabSample");
 LPCTSTR csAppPath = _T("AppPath");
 LPCTSTR csTodaykey = _T("Software\\Microsoft\\Today\\Items\\\"打包示例\"");
 LPCTSTR csPlugName = _T("MyToday.dll");  // 你的插件名
 LPCTSTR csAppName = _T("CabSample.exe");  // 你的程序名

 if(cfaileddirs || cfailedfiles || cfailedregkeys
  || cfailedregvals || cfailedshortcuts)
  goto Failed;

 //獲取主程序安裝路徑
 _tcscpy(szPath, pszinstalldir);
 _tcscat(szPath, _T("\\"));
 _tcscat(szPath, csAppName);

 //設置主程序快捷方式的執(zhí)行路徑
 _tcscpy(szAppPath, _T("\""));
 _tcscat(szAppPath, szPath);
 _tcscat(szAppPath, _T("\""));

 // 將主程序安裝路徑寫入注冊表
 
 lResult = ::RegCreateKeyEx(HKEY_CURRENT_USER, keyName, 0, _T(""), REG_OPTION_NON_VOLATILE,
        0,NULL,&hOpenKey, &dwOpenStyle);
 if(lResult != ERROR_SUCCESS)
  goto Success;
 ::RegSetValueEx(hOpenKey, csAppPath, 0, REG_SZ, (BYTE*)&szPath, sizeof(TCHAR) * _tcslen(szPath));
 ::RegCloseKey(hOpenKey);

 memset(szPath, 0x00, sizeof(TCHAR) * MAX_PATH); 
 _tcscpy(szPath, pszinstalldir);
 _tcscat(szPath, _T("\\"));
 _tcscat(szPath, csPlugName);
 ::CopyFile(szPath, _T("\\Windows\\MyToday.dll"), FALSE);

 // 安裝 “今日插件”
 hOpenKey = NULL;
 lResult = ::RegCreateKeyEx(HKEY_LOCAL_MACHINE, csTodaykey, 0, _T(""), REG_OPTION_NON_VOLATILE,
        0, NULL, &hOpenKey, &dwOpenStyle);

 if(lResult != ERROR_SUCCESS)
  goto Success; //如果讀寫注冊表失敗， 放棄安裝 “今日插件”

 

 // 注冊插件
 iTemp  = 0;
 ::RegSetValueEx(hOpenKey, _T("Flags"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 ::RegSetValueEx(hOpenKey, _T("Options"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 iTemp  = 1;
 ::RegSetValueEx(hOpenKey, _T("Enabled"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 ::RegSetValueEx(hOpenKey, _T("Order"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 ::RegSetValueEx(hOpenKey, _T("Selectability"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 iTemp  = 4;
 ::RegSetValueEx(hOpenKey, _T("Type"), 0, REG_DWORD, (BYTE*)&iTemp, sizeof(iTemp));
 ::RegSetValueEx(hOpenKey, _T("DLL"), 0, REG_SZ, (BYTE*)_T("\\Windows\\MyToday.dll"), sizeof(TCHAR) * _tcslen(szPath));
 // 發(fā)送系統(tǒng)消息
 ::SendMessage(HWND_BROADCAST, WM_WININICHANGE, (WPARAM)0xF2, 0);
 ::RegCloseKey(hOpenKey);
 
 //創(chuàng)建快捷方式
 if(SHGetSpecialFolderPath(NULL, szLinkPath, CSIDL_PROGRAMS,FALSE))
 {
  _tcscat(szLinkPath, _T("\\"));
  _tcscat(szLinkPath, _T("打包示例.lnk"));

  if(SHCreateShortcut(szLinkPath, szAppPath) == FALSE)
  {
   MessageBox(NULL, _T("安裝快捷方式失敗"), _T("提示"), MB_OK);
  }

 }
 else
  MessageBox(NULL, _T("獲取系統(tǒng)文件路徑失敗"), _T("提示"), MB_OK);

 //return value
Success:
 return codeINSTALL_EXIT_DONE;

Failed:
 return codeINSTALL_EXIT_UNINSTALL;
}
然后在Setupdll程序生成的安裝包中把你的今日插件放進來，然后在PPC上運行Setupdll安裝包就可以了，關于注冊表的值，請看下表：

Value Name and Type	Description
DWORD: Type	Custom Items must have Type = 4
DWORD: Enabled	0 or 1; 1 causes Today panel to show your component; nevertheless, the user can control it via the Today applet in the Control Panel
DWORD: Options	if equals 1, the "Options" button in the Today applet will be enabled
SZ: DLL	Pull path to your component
DWORD : Selectability	New feature in Win Mobile 2003 SE; allows receiving additional notifications Values are used as follows: 0 or does not exist—component cannot be selected at all 1—selections are manages automatically. In other words, your component will receive messages like WM_LBUTTONXXX 2—the Today screen will send notification messages to your component when the user sets/releases focus or presses navigation keys

Order表示的是插件的位置，可以選的。放到最上端的值應該是9，具體的根據(jù)需要來調(diào)整