Solved

A problem with receiving a message from a Taskbar Icon

Posted on 1999-01-05
5
212 Views
Last Modified: 2012-05-04
In my application's main function I create a new taskbar icon with:
bool fAdded;
NOTIFYICONDATA tnd;
LPCTSTR g_szState1="You are over the icon...";
lstrcpyn (tnd.szTip, g_szState1, sizeof (tnd.szTip));
tnd.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
tnd.uID = (UINT)IDI_MYICON;
tnd.cbSize = sizeof (NOTIFYICONDATA);
tnd.hWnd = m_pMainWnd->m_hWnd;
tnd.uCallbackMessage = MYWM_NOTIFYICON;
tnd.hIcon = AfxGetApp()->LoadIcon(IDI_MYICON);

when m_mMainWnd is:
CMyAppDlg dlg;
m_pMainWnd = &dlg;

In CMyAppDlg I wrote:
BEGIN_MESSAGE_MAP(CMyAppDlg, CDialog)
      //{{AFX_MSG_MAP(CMyAppDlg)
ON_MESSAGE(MYWM_NOTIFYICON, TrayCallback)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

and TrayCallback is defined:
void CMyAppDlg::TrayCallback (WPARAM wParam, LPARAM lParam)
{
      UINT uID;
      UINT uMouseMsg;

      uID = (UINT)wParam;
      uMouseMsg = (UINT)lParam;

      if (uMouseMsg == WM_LBUTTONDOWN)
      {
            if (uID == (UINT)IDR_MAINFRAME)
                  MessageBox ("This sure is fun!", "Click!", MB_OK);
      }
}

The Taskbar icon is displayed properly, but when I pass the mouse over it, it disappears, and the message box isn't displayed. (the TrayCallback function is not even entered.)
Help would be appreciated.
Thanks
 



0
Comment
Question by:gilbert_chang
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 

Author Comment

by:gilbert_chang
ID: 1181547
I forgot to add that I actually put the icon by:
fAdded = Shell_NotifyIcon(NIM_ADD, &tnd);
right after all the icon's definitions.
0
 
LVL 11

Expert Comment

by:alexo
ID: 1181548
>> The Taskbar icon is displayed properly, but when I pass the mouse over it, it disappears
It usually happens when the program is either terminated without removing the icon or is not in a message loop.
0
 

Accepted Solution

by:
_serega earned 50 total points
ID: 1181549
hi gilbert_chang
i suppose that you put an incorrect value in tnd.hWnd
i've got your code and set
tnd.hWnd = this -> m_hWnd;
(in my OnInitDialog )
and all works
regards

0
 

Expert Comment

by:_serega
ID: 1181550
hi again
as far as i know,
Shell_NotifyIcon() function returns int value, not boolean
0
 

Author Comment

by:gilbert_chang
ID: 1181551
Thanks.
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
C++ Class Serialization, Encapsulation and Formatted Output 8 91
Header of docx file 17 131
find Speed using GPS latitude & longitude 4 90
why doesn't assert terminate here? 2 11
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
C++ Properties One feature missing from standard C++ that you will find in many other Object Oriented Programming languages is something called a Property (http://www.experts-exchange.com/Programming/Languages/CPP/A_3912-Object-Properties-in-C.ht…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question