C / C++ / MFC

struct _itemData
{
	CString strData;
};

void CJKDlg::OnBnClickedOk()
{
	CStdioFile stdFile;
	CString str;
	
	if(! stdFile.Open("test.txt", CFile::modeRead))
	{
		AfxMessageBox("Cannot find initialization file", MB_OK, MB_ICONSTOP);
		return;
	}

	TVINSERTSTRUCT tvInsert;
	tvInsert.hParent = NULL;
	tvInsert.hInsertAfter = NULL;
	tvInsert.item.mask = TVIF_TEXT;

	HTREEITEM hAlbum, hItem;
	char ch;
	CString albumTitle, trackTitle, trackPath;
	_itemData* pItemData = new _itemData();

	while(stdFile.ReadString(str))
	{
		ch = str.GetAt(0);
		if(ch=='$')
		{
			albumTitle = str.Right(str.GetLength()-1);
			//TRACE1("%s\n", albumTitle);
			tvInsert.item.pszText = albumTitle.GetBuffer(albumTitle.GetLength());
			hAlbum = m_treeTracks.InsertItem(&tvInsert);
			pItemData->strData = "OK";
			m_treeTracks.SetItemData(hAlbum, DWORD(pItemData));
		}
	}

	delete pItemData;

}

void CJKDlg::OnNMDblclkTreeTracks(NMHDR *pNMHDR, LRESULT *pResult)
{
	HTREEITEM hItem = m_treeTracks.GetSelectedItem();
	ASSERT(hItem);
	_itemData* pItemData  = new _itemData();
	pItemData = (_itemData *)m_treeTracks.GetItemData(hItem); 
	
	if(pItemData)
	{
             TRACE1("%s\n", pItemData->strData);
	}
	
	delete pItemData;
	*pResult = 0;
}