WINCE中只允许程序运行一个实例

.NET CF:

[DllImport("coredll.Dll")] 
private static extern int GetLastError(); 

[DllImport("coredll.Dll")] 
private static extern int ReleaseMutex(IntPtr hMutex); 

[DllImport("coredll.Dll")] 
private static extern IntPtr CreateMutex(SECURITY_ATTRIBUTES lpMutexAttributes,

                                         bool bInitialOwner,

                                         string lpName); 

[StructLayout( LayoutKind.Sequential)] 
public class SECURITY_ATTRIBUTES 
{ 
　 public int nLength; 
　 public int lpSecurityDescriptor; 
　 public int bInheritHandle; 
} 
const int ERROR_ALREADY_EXISTS = 0183; 

static void Main() 
{   
    #region Api_Call CreateMutex; 
    IntPtr hMutex; 
　   hMutex=CreateMutex(null,false,"程序名"); 
　   if (GetLastError()!=ERROR_ALREADY_EXISTS) 
　   { 
　       Application.Run(new Frmmenu()); 
　   } 
　   else 
　   { 
　       MessageBox.Show("本程序只允许同时运行一个"); 
　       ReleaseMutex(hMutex); 
    } 
    #endregion 
}

EVC:

    HANDLE   hMutex=::CreateMutex(NULL,TRUE,L"LiCR");  
    if(hMutex!=NULL)   
    {   
        if(GetLastError()==ERROR_ALREADY_EXISTS)   
        { 

            AfxMessageBox( "已经有一个程序运行." );    
            ReleaseMutex(hMutex);
            return  FALSE;   
        }   
    }

大部分网站就只提供到这一步，但是在实际操作过程中，有时还是会打开多个实例，下面提供一个方式，再次单击时，打开第一个实例，经实际测试，通过

        [DllImport("coredll.dll", EntryPoint = "CreateMutex", SetLastError = true)]
        public static extern IntPtr CreateMutex(IntPtr lpMutexAttributes, bool bInitiaOwner, string lpName);
        [DllImport("coredll.dll", SetLastError = true)]
        public static extern int ReleaseMutex(IntPtr hMutex);
        [DllImport("coredll.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport("coredll.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
        [DllImport("coredll.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        public const int ERROR_ALREADY_EXISTS = 183;
        public const int SW_SHOW = 5;
        public static LoginForm MainWindow;
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [MTAThread]
        static void Main()
        {
            IntPtr hMutex = CreateMutex(IntPtr.Zero, false, @"GprsPatrolNtV2");
            if (Marshal.GetLastWin32Error() == ERROR_ALREADY_EXISTS)
            {
                IntPtr mainFrm = FindWindow(null, GlobalSetting.ApplicationTitle);
                ShowWindow(mainFrm, SW_SHOW);
                SetForegroundWindow(mainFrm);
                Application.Exit();
            }
            else
            {
                MainWindow = new LoginForm();
                Application.Run(MainWindow);
                ReleaseMutex(hMutex);
            }
        }