C / C++ / MFC

// IN HEADER
class CMyDialog : public CDialog
{
     //.......
     int m_FillBrushIndex;
     CBrush m_FillBrush[2];
     //.......
};

// IN CPP FILE
afx_msg BOOL CMyDialogLLOnEraseBkgnd( CDC* pDC )
{
    //...
    pDC->FillRect(&rect,&m_FillBrush[m_FillBrushIndex]);
    //...
    return TRUE;
}

void CLineInfoDlg::OnButton1()
{
    //...
    m_FillBrushIndex = 0;
    InvalidateWindow();
}

void CLineInfoDlg::OnButton2()
{
    //...
    m_FillBrushIndex = 1;
    InvalidateWindow();
}

<br />
#include <stdio.h><br />
<br />
void f1(FILE *f)<br />
{<br />
<br />
	while (!feof(f))<br />
	{<br />
		char s[256];<br />
		fgets(s,255,f);<br />
		printf("%s",s);<br />
	}<br />
}<br />
<br />
<br />
void f2(FILE *f)<br />
{<br />
<br />
	while (!feof(f))<br />
	{<br />
		char s[256];<br />
		fgets(s,255,f);<br />
		printf("%s",s);<br />
	}<br />
}<br />
<br />
main()<br />
{<br />
	FILE *file;<br />
	file=fopen("c:\\dlls.txt","r");<br />
	f1(file);<br />
	f2(file);<br />
	fcloseall();<br />
}<br />