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[一篇VC小文章]VC++制作一個最小化最小托盤的8步驟（Minimize your app to systray in 8 easy steps）翻譯完

By Yasar Arslan. From codeproject

這篇文章內容比較基礎，最近看到覺得有用，順便翻譯一下
有空可以寫一個自己的TrayIcon類，化簡這些原始的操作。

Introduction

這篇文章解析了 Shell_NotifyIcon 這個函數用法--用來建立你自己的應用程序的系統托盤圖標.
這篇文章給了基本的縮小到托盤的操作過程并讓你從中了解.
這篇文章提供8個簡單的步驟讓你成功的實現在你的程序中建立系統托盤圖標.
源代碼提供了一個基于對話框的演示程序.

Tray Icons

為了用托盤圖標你需要用一個shell函數 :)

BOOL Shell_NotifyIcon( DWORD dwMessage, PNOTIFYICONDATA pnid );

The dwMessage?可選的參數包括 the NIM_ADD,NIM_DELETE and NIM_MODIFY功能分別是添加刪除以及修改圖標于系統圖標.

PNOTIFYICONDATA 結構包括這些系統需要處理的任務圖標狀態區域消息等信息.
typedef??struct _NOTIFYICONDATA {
??? DWORD cbSize;
??? HWND hWnd;
??? UINT uID;
??? UINT uFlags;
??? UINT uCallbackMessage;
??? HICON hIcon;
??? #if (_WIN32_IE < 0x0500)
??????? TCHAR szTip[64];
??? #else
??????? TCHAR szTip[128];
??? #endif??? #if (_WIN32_IE >= 0x0500)
??????? DWORD dwState;
??????? DWORD dwStateMask;
??????? TCHAR szInfo[256];
??????? union {
??????????? UINT? uTimeout;
??????????? UINT? uVersion;
??????? } DUMMYUNIONNAME;
??????? TCHAR szInfoTitle[64];
??????? DWORD dwInfoFlags;
??? #endif??? #if (_WIN32_IE >= 0x600)
??????? GUID guidItem;
??? #endif
} NOTIFYICONDATA, *PNOTIFYICONDATA;

*Note:?更完全的信息可以去參考MSDN

Creating the Application

Create a new VC++ dialog based project and call it TrayMin.
創建一個名叫TrayMin的基于對話框的VC++工程

Step: 1

自定義消息于 TrayMinDlg.h 頭文件.

				#define WM_TRAY_MESSAGE (WM_USER + 1)
		

The WM_USER 常量用來幫助用戶定義自己的消息被用來建立個人的窗口類, 定義時通常用這種格式 WM_USER+X,?這里 X 是一個整形變量.

*更詳細的看MSDN

Step: 2

現在在Now add the DECLARE_MESSAGE_MAP() 之前添加下面的用戶函數吧（ TrayMinDlg.h file）?? afx_msg void OnTrayNotify(WPARAM wParam, LPARAM lParam);
?

當添加一個圖標到托盤時這有一個圖標的回調消息，注意到 NOTIFYICONDATA 結構中有uCallbackMessage成員是回調消息識別的關鍵，它會被傳給NIM_ADD（我們之后將會見到更詳細的）。當添加托盤圖標這個事件發生時，系統發送一個回調函數到由hWnd成員對象指定的窗口過程（winproc），wParam 參數可以用來被識別究竟發生了什么操作。lParam參數存放發生事件相關的鼠標或者鍵盤消息。舉個例子，當一個鼠標指針指向一個托盤圖標，lParam將包括WM_MOUSEMOVE

Step: 3

現在添加下面的這行在消息宏中（MessageMap）在TrayMinDlg.cpp

ON_MESSAGE(WM_TRAY_MESSAGE,OnTrayNotify)
?

現在應該是這樣的.

    BEGIN_MESSAGE_MAP(CTrayMinDlg, CDialog)
      //{{AFX_MSG_MAP(CTrayMinDlg)
      ON_WM_SYSCOMMAND()
      ON_WM_PAINT()
      ON_WM_QUERYDRAGICON()
      ON_MESSAGE(WM_TRAY_MESSAGE ,OnTrayNotify)
      //}}AFX_MSG_MAP
    END_MESSAGE_MAP()

  

Step: 4

現在在TrayMinDlg.cpp 定義OnTrayNotify函數，不要忘記在函數頭部添加afx_msg。

  afx_msg void CTrayMinDlg::OnTrayNotify(WPARAM wParam, LPARAM lParam)
  {
    UINT uID; 
    UINT uMsg; 
 
    uID = (UINT) wParam;
    uMsg = (UINT) lParam; 
 
  
    if (uID != 1)
      return;
  
    CPoint pt;  
  
  
    switch (uMsg ) 
    { 

    case WM_LBUTTONDOWN:
      GetCursorPos(&pt);
      ClientToScreen(&pt);
      OnTrayLButtonDown(pt);
      break;
  
    case WM_RBUTTONDOWN:
    case WM_CONTEXTMENU:
      GetCursorPos(&pt);
      OnTrayRButtonDown(pt);
      break;

    } 
    return; 
  }
  

Step: 5

現在在TrayMinDlg類添加兩個成員函數來相應鼠標事件。

實現鼠標左鍵單擊的相應

• 函數類型：void ?
• 函數聲明：?OnTrayLButtonDown(CPoint pt)

實現鼠標右鍵單擊的相應

• 函數類型: void
• 函數聲明: OnTrayRButtonDown(CPoint pt)

OnTrayLButtonDown(CPoint pt)的定義如下.

				void CTrayMinDlg::OnTrayLButtonDown(CPoint pt)
    {  
      MessageBox("You have clicked Left mouse Button ");
    }
  

The Declaration of OnTrayRButtonDown(CPoint pt) is as following.

				void CTrayMinDlg::OnTrayRButtonDown(CPoint pt)
    {  
      //m_menu is the member of CTrayMinDlg as CMenu m_menu;
      m_menu.GetSubMenu(0)->TrackPopupMenu(TPM_BOTTOMALIGN|
       TPM_LEFTBUTTON|TPM_RIGHTBUTTON,pt.x,pt.y,this);      
    }
  

Step: 6

Add two member variable to the CTrayMinDlg.
為CTrayMinDlg添加兩個成員變量

• Variable Type: NOTIFYICONDATA
• Variable Name: m_TrayData;
• Variable Type: CMenu
• Variable Name: m_menu;

現在添加菜單資源

Step: 7

現在畫一個最小化的按鈕在對話框設計中
并且添加這個按鈕的執行函數

void CShellDlg::OnMinimize() 
  {
    m_TrayData.cbSize = sizeof(NOTIFYICONDATA);
    //Size of this structure, in bytes. 
    
    
    m_TrayData.hWnd  = this->m_hWnd;
    //Handle to the window that receives notification //messages associated with an icon in the taskbar //status area. The Shell uses hWnd and uID to //identify which icon to operate on when //Shell_NotifyIcon is invoked. 
  
    m_TrayData.uID = 1;
    //Application-defined identifier of the taskbar icon.//The Shell uses hWnd and uID to identify which icon //to operate on when Shell_NotifyIcon is invoked. You// can have multiple icons associated with a single //hWnd by assigning each a different uID. 

    m_TrayData.uCallbackMessage  = WM_TRAY_MESSAGE;
    //Application-defined message identifier. The system //uses this identifier to send notifications to the //window identified in hWnd. These notifications are //sent when a mouse event occurs in the bounding //rectangle of the icon, or when the icon is selected //or activated with the keyboard. The wParam parameter //of the message contains the identifier of the taskbar //icon in which the event occurred. The lParam parameter //holds the mouse or keyboard message associated with the// event. For example, when the pointer moves over a //taskbar icon, lParam is set to WM_MOUSEMOVE. 
    


    m_TrayData.hIcon = this->m_hIcon;
    //Handle to the icon to be added, modified, or deleted
    
    strcpy(m_TrayData.szTip,"My Icon");
    //Pointer to a null-terminated string with the text //for a standard ToolTip. It can have a maximum of 64 //characters including the terminating NULL. 
    
    
    m_TrayData.uFlags = NIF_ICON|NIF_MESSAGE;
    //Flags that indicate which of the other members contain 
    valid data.  
  

    BOOL bSuccess = FALSE;
    BOOL BSus = FALSE;

    BSus = m_menu.LoadMenu(IDR_MENU1);
    if(!(BSus))
      MessageBox("Unabled to Loa menu");

    bSuccess = Shell_NotifyIcon(NIM_ADD,&m_TrayData);

    if(!(bSuccess))
      MessageBox("Unable to Set Tary Icon");
    else
    {
      this->ShowWindow(SW_MINIMIZE);
      this->ShowWindow(SW_HIDE);

    }
  }
  
  

Step: 8

在退出菜單的執行函數寫下如下

Shell_NotifyIcon(NIM_DELETE,&m_TrayData);
? DestroyWindow();

現在可以運行程序，并且嘗試最小化按鈕的使用（他會最小化導系統托盤）。
現在盡情發揮，完善這些步驟，完成自己的系統托盤圖標吧！

Yasar Arslan

posted on 2007-03-06 19:06 Gohan 閱讀(1883) 評論(0)  編輯 收藏 引用 所屬分類: C++