C / C++ / MFC

class CTestApp : public CWinApp<br />
{<br />
	public:<br />
	CTestApp();<br />
	virtual ~CTestApp();<br />
	virtual BOOL InitInstance();<br />
	afx_msg LRESULT OnMsg(WPARAM wParam, LPARAM lParam);<br />
        DECLARE_MESSAGE_MAP()<br />
};

#include "stdafx.h"<br />
#include "TestApp.h"<br />
<br />
#define WM_MY_EVENT	(WM_APP + 100)<br />
<br />
BEGIN_MESSAGE_MAP(CTestApp, CWinApp)<br />
	ON_MESSAGE(WM_MY_EVENT, OnMsg)<br />
END_MESSAGE_MAP()<br />
<br />
void FileWrite(char *data)<br />
{<br />
	FILE *f;<br />
	errno_t err;<br />
	err = fopen_s(&f, "C:\\debug.txt", "a");<br />
	fprintf(f, data);<br />
	fflush(f);<br />
	fclose(f);<br />
}<br />
<br />
CTestApp::CTestApp()<br />
{   <br />
	FileWrite("Constructed\n");<br />
}<br />
CTestApp::~CTestApp()<br />
{<br />
	FileWrite("Destructed\n");<br />
}<br />
<br />
CTestApp theApp;<br />
<br />
BOOL CTestApp::InitInstance()<br />
{<br />
	FileWrite("Initialized\n");<br />
	return false;<br />
}