How To Hide A Window in TaskBar

ITaskbarList.DeleteTab(IntPtr)

error C2065: 'LPITaskbarList' : undeclared identifier

#include "Shobjidl.h"

DECLARE_INTERFACE_(ITaskbarList, IUnknown)  
{  
    STDMETHOD (HrInit)       (THIS) PURE;  
    STDMETHOD (AddTab)       (THIS_ HWND hwnd) PURE;  
    STDMETHOD (DeleteTab)    (THIS_ HWND hwnd) PURE;  
    STDMETHOD (ActivateTab)  (THIS_ HWND hwnd) PURE;  
    STDMETHOD (SetActiveAlt) (THIS_ HWND hwnd) PURE;  
};  
typedef ITaskbarList *LPITaskbarList;  

// TestITaskbarListDlg.h : header file
//

#if !defined(AFX_TESTITASKBARLISTDLG_H__)
#define AFX_TESTITASKBARLISTDLG_H__

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

DECLARE_INTERFACE_(ITaskbarList, IUnknown)  
{  
    STDMETHOD (HrInit)       (THIS) PURE;  
    STDMETHOD (AddTab)       (THIS_ HWND hwnd) PURE;  
    STDMETHOD (DeleteTab)    (THIS_ HWND hwnd) PURE;  
    STDMETHOD (ActivateTab)  (THIS_ HWND hwnd) PURE;  
    STDMETHOD (SetActiveAlt) (THIS_ HWND hwnd) PURE;  
};  
typedef ITaskbarList *LPITaskbarList;  

/////////////////////////////////////////////////////////////////////////////
// CTestITaskbarListDlg dialog

class CTestITaskbarListDlg : public CDialog
{
// Construction
public:
	CTestITaskbarListDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	//{{AFX_DATA(CTestITaskbarListDlg)
	enum { IDD = IDD_TESTITASKBARLIST_DIALOG };
		// NOTE: the ClassWizard will add data members here
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CTestITaskbarListDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	HICON m_hIcon;

	LPITaskbarList pTaskbar;

	// Generated message map functions
	//{{AFX_MSG(CTestITaskbarListDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnButton1();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_TESTITASKBARLISTDLG_H__)

CTestITaskbarListDlg::CTestITaskbarListDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTestITaskbarListDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CTestITaskbarListDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon  = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	pTaskbar = NULL;
}

...
...

BEGIN_MESSAGE_MAP(CTestITaskbarListDlg, CDialog)
	//{{AFX_MSG_MAP(CTestITaskbarListDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

...
...

BOOL CTestITaskbarListDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	HRESULT hRes = ::CoInitialize(0);
	if ( hRes != S_OK )
	{
		::AfxMessageBox("*** Error: Problem to initialize the COM library !");
		::PostQuitMessage(0);
	}

	//We call below function since we only need to create one object
	::CoCreateInstance(CLSID_TaskbarList, 0, CLSCTX_SERVER, IID_ITaskbarList, (void**)&pTaskbar);
	if ( hRes != S_OK )
	{
		::AfxMessageBox("*** Error: Problem to create a single instance of the task bar list !");
		::PostQuitMessage(0);
	}

	//Below function will initialize the taskbar list object
	hRes = pTaskbar->HrInit();
	if ( hRes != S_OK )
	{
		::AfxMessageBox("*** Error: Problem to initialize the COM instance !");
		::PostQuitMessage(0);
	}
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

...
...

void CTestITaskbarListDlg::OnButton1() 
{
	if ( NOERROR != pTaskbar->DeleteTab(m_hWnd) )
	{
		TRACE("*** Error: Problem to delete tab from the Task bar !!!");
	}
}