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);
}
}