C / C++ / MFC

extern string strDay[7];
extern string strMonth[12];

class CLogBook
{
public:
	CLogBook();
	virtual ~CLogBook();

	BOOL Open(string);
	void Close();

	BOOL FillListBox(HWND);
	virtual BOOL Write(string) = 0;
	BOOL Clear();

protected:
	fstream m_filestream;
};

class CErrorLog : public CLogBook
{
public:
	CErrorLog();
	~CErrorLog();

	BOOL Write(string);
};

#include "stdafx.h"

string strDay[7] = {"Söndag", "Måndag",
					"Tisdag", "Onsdag",
					"Torsdag", "Fredag",
					"Lördag"};

string strMonth[12] = {"januari", "februari", "mars",
					   "april", "maj", "juni",
					   "juli", "augusti", "september",
					   "oktober", "november", "december"};

CLogBook::~CLogBook()
{
	Close();
}

BOOL CLogBook::Open(string path)
{
	m_filestream.open(path.c_str(),
					  ios_base::in | ios_base::out | ios_base::app);
	
	if(!m_filestream.is_open())
		return FALSE;

	return TRUE;
}

void CLogBook::Close()
{
	if(!m_filestream.is_open())
		m_filestream.close();
}

BOOL CLogBook::Clear()
{
	if(!m_filestream.is_open())
		return FALSE;

	m_filestream.write("",0);
	return TRUE;
}

BOOL CLogBook::FillListBox(HWND listbox)
{
	if(!m_filestream.is_open())
		return FALSE;

	m_filestream.seekg(0);
	while(!m_filestream.eof())
	{
		string buf("");
		getline(m_filestream, buf, '\n');
		ListBox_AddString(listbox, buf.c_str());
	}
	return TRUE;
}

BOOL CLogBook::Write(string data)
{
	if(!m_filestream.is_open())
		return FALSE;

	m_filestream.write(data.c_str(), (int)data.length());
	return TRUE;
}

///
/// CErrorLog derived class
///

BOOL CErrorLog::Write(string data)
{
	string strDataToWrite("");
	strDataToWrite.append(DateTimeString());
	strDataToWrite.append(" > ");
	strDataToWrite.append(data);

	return CLogBook::Write(strDataToWrite);
}

DWORD dwCb = sizeof(RASENTRYNAME);<br />
DWORD dwEntries = 0;<br />
RASENTRYNAME lpRasEntryName[20];<br />
<br />
ZeroMemory(lpRasEntryName, sizeof(lpRasEntryName));<br />
<br />
lpRasEntryName[0].dwSize = sizeof(RASENTRYNAME);<br />
RasEnumEntries(NULL,NULL,lpRasEntryName,&dwCb,&dwEntries);

DWORD dwCb = 20 * sizeof(RASENTRYNAME);

HINSTANCE hsav= AfxGetResourceHandle();
AfxSetResourceHandle(theApp->m_hInstance); // theApp is the CWinApp-derived pointer

m_pMsgDlg = new CMsgDlg(this);
if (m_pMsgDlg->Create(IDD_MSGDLG, tempPtr) == FALSE)
{
MessageBox("no dialog");
}

AfxSetResourceHandle(hsav); // put-back