C ++ Dialog Box System Tray implementation

Background requirements:

1. When the MFC dialog box is minimized, only the tray icon in the lower right corner of the system is displayed.

2. Double-click the tray and restore it in the dialog box.

3. Right-click the tray and the "close" menu will pop up to close the dialog box.

Steps:

1. Create an MFC dialog box Program (in this example, the program name is TaskbarIcon) and set "MinimizeBox" to true in the property.

2. Define a custom message macro.

[Cpp]
# Define policy_show WM_USER + 2500

3. The OnSysCommand (system message response function) Addition Dialog Box minimizes code execution.
[Cpp] view plaincopy
Void CTaskbarIconDlg: OnSysCommand (UINT nID, LPARAM lParam)
{
If (SC _MINIMIZE = nID)
{
NOTIFYICONDATA nid;
Nid. cbSize = (DWORD) sizeof (policyicondata );
Nid. hWnd = this-> m_hWnd;
Nid. uID = IDR_MAINFRAME;
Nid. uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
Nid. uCallbackMessage = policy_show; // custom message name
Nid. hIcon = LoadIcon (AfxGetInstanceHandle (), MAKEINTRESOURCE (IDR_MAINFRAME ));
Wcscpy_s (nid. szTip, _ T ("icon test"); // message tip
 
Shell_policyicon (NIM_ADD, & nid); // Add an icon in the tray Area
ShowWindow (SW_HIDE); // hide the Main Window
Return;
}
 
//... Built-in system code
}

4. Custom message response for pallets

[Cpp]
BEGIN_MESSAGE_MAP (CTaskbarIconDlg, CDialog)
//... Omitting other message ing
 
ON_MESSAGE (policy_show, OnTrayIcon)
//} AFX_MSG_MAP
END_MESSAGE_MAP ()
 
Afx_msg LRESULT OnTrayIcon (WPARAM wParam, LPARAM lParam );
 
LRESULT CTaskbarIconDlg: OnTrayIcon (WPARAM wParam, LPARAM lParam)
{
If (wParam! = IDR_MAINFRAME)
{
Return 1;
}

Switch (lParam)
{
Case WM_RBUTTONUP:
{
// The shortcut menu is displayed when you right-click it. There is only one "off"
 
// Declare a pop-up menu
// Add the menu item "close" and click it to send the message WM_CLOSE to the main window (already
// Hide) to end the program.
CMenu menu;
Menu. CreatePopupMenu ();
Menu. AppendMenu (MF_STRING, ID_APP_EXIT, _ T ("close "));
 
// Get the mouse position
LPPOINT lpoint = new tagPOINT;
: GetCursorPos (lpoint );
 
// Determine the position of the pop-up menu
Menu. TrackPopupMenu (TPM_LEFTALIGN, lpoint-> x, lpoint-> y, this );
 
// Reclaim Resources
HMENU hmenu = menu. Detach ();
Menu. DestroyMenu ();
 
Delete lpoint;
Lpoint = NULL;
 
Break;
}
Case WM_LBUTTONDBLCLK:
{
// Double-click the left button.
 
// Display page www.2cto.com
ShowWindow (SW_SHOW );
// Top the interface
SetForegroundWindow ();
 
Break;
}
}
 
Return 0;
}

5. Delete the tray icon when you close it.

Override OnCancel function.

[Cpp]
Virtual void OnCancel ();
 
Void CTaskbarIconDlg: OnCancel ()
{
// Delete the taskbar icon
NOTIFYICONDATA nid;
Nid. hWnd = this-> m_hWnd;
Nid. uID = IDR_MAINFRAME;
Shell_policyicon (NIM_DELETE, & nid );
 
CDialog: OnCancel ();
}

Author: segen_jaa