隐藏基于对话框程序

定义托盘响应消息:
#define WM_SYSTRAY WM_USER + 120

在头文件中定义变量:
WINDOWPLACEMENT m_wp; // 以便在恢复时使用
NOTIFYICONDATA m_tmid; // 托盘结构
CRect m_rectWnd; // 保存窗口区域

在初始化函数中加入：
GetWindowRect(&m_rectWnd); // 恢复时使用
GetWindowPlacement(&m_wp); //恢复时用
ModifyStyleEx (WS_EX_APPWINDOW, WS_EX_TOOLWINDOW); // 不在工具栏显示

WINDOWPLACEMENT wp;

wp.length = sizeof(WINDOWPLACEMENT);
wp.flags = WPF_RESTORETOMAXIMIZED;
wp.showCmd = SW_HIDE;
SetWindowPlacement(&wp);

m_tmid.cbSize = sizeof (NOTIFYICONDATA);
m_tmid.hWnd = this->m_hWnd;
m_tmid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
m_tmid.uCallbackMessage = WM_SYSTRAY;
m_tmid.uID = IDR_MAINFRAME;

CString sz = _T("");
strcpy(m_tmid.szTip, "");
HICON hIcon;
hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_tmid.hIcon = hIcon;
PNOTIFYICONDATA m_ptnid = &m_tmid;
::Shell_NotifyIcon(NIM_ADD, m_ptnid);
if (hIcon)
::DestroyIcon(hIcon);

增加窗口消息函数 WM_DESTROY 增加如下
void CClientDlg::OnDestroy()
{
CDialog::OnDestroy();
::Shell_NotifyIcon(NIM_DELETE ,&m_tmid);
}
响应WindowProc消息
LRESULT CClientDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_SYSTRAY:
if (lParam == WM_LBUTTONDBLCLK)
{
// 恢复窗口
ModifyStyleEx(WS_EX_TOOLWINDOW, WS_EX_APPWINDOW);
SetWindowPlacement(&m_wp);
MoveWindow(m_rectWnd, TRUE);
CenterWindow();
}
break;
case WM_SYSCOMMAND:
if (wParam == SC_MINIMIZE)
{
AfxGetMainWnd()->ShowWindow (SW_HIDE);
return 0;
}

if (wParam == SC_CLOSE)
{
OnCancel();
return 0;
}
break;
}

return CDialog::WindowProc(message, wParam, lParam);
}