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 constructorBOOL 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