单击按钮启动、停止交替切欣换
1、在1Dlg.h文件中添加代码

public:
	CMy1Dlg(CWnd* pParent = NULL);	// standard constructor
	BOOL m_b;

2、在1Dlg.cpp文件中添加代码

CMy1Dlg::CMy1Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMy1Dlg::IDD, pParent)
{	
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
		 m_b = FALSE;
}

void CMy1Dlg::OnButton1() 
{
if(!m_b)
	{
		m_b = TRUE;
	SetDlgItemText(IDC_BUTTON1,"启动");
	}
	else
	{
		m_b = FALSE;
	SetDlgItemText(IDC_BUTTON1,"停止");
	}		
}

运行程序