创建了个MFC对话框程序，怎么运行一次

[席戛戛]

BOOL CtestkeyboardApp::InitInstance()
{
if (!oneinstance())
{
return FALSE;
}//我在InitInstance函数一开始就用互斥对象判断是否存在
。。。
}

//oneinstance如下
BOOL CtestkeyboardApp::oneinstance()
{
/****/
//唯一
HANDLE hMutex = NULL;
TCHAR *lpszName = "TestMutex";

hMutex = ::CreateMutex(NULL, FALSE, lpszName);
DWORD dwRet = ::GetLastError();
if (hMutex)
{
if (ERROR_ALREADY_EXISTS == dwRet)
{
AfxMessageBox("Has been running");
CloseHandle(hMutex); // should be closed
return FALSE;
}
}
else
{
//创建失败
}
::CloseHandle(hMutex);

// Add this code in Destruction function
/****/
return TRUE;
}


为什么我的程序还是能够 打开好多个。

[席戛戛]

引用 1 楼 bjym1987 的回复:

 if (!oneinstance())
 {
        return TRUE;
 }

试一下

还是能运行多个。

[老王爱上猫]

自己调试下，写法大体没问题..

[赵4老师]

HANDLE hMutex; hMutex = CreateMutex(NULL, FALSE, "RECcap" ); if ( WaitForSingleObject(hMutex, 1000) == WAIT_TIMEOUT ) { // There is another instance out there, but it is taking to long to // locate, just exit return FALSE; } if ( GetLastError() == ERROR_ALREADY_EXISTS ) { ReleaseMutex(hMutex); return FALSE; } …… ReleaseMutex(hMutex); CloseHandle(hMutex);

[赵4老师]

 HANDLE hMutex;
    hMutex = CreateMutex(NULL, FALSE, "YourProgramName" );
    if ( WaitForSingleObject(hMutex, 1000) == WAIT_TIMEOUT ) {
        // There is another instance out there, but it is taking to long to
        // locate, just exit
        return FALSE;
    }
    if ( GetLastError() == ERROR_ALREADY_EXISTS ) {
        ReleaseMutex(hMutex);
        return FALSE;
    }
……
    ReleaseMutex(hMutex);
    CloseHandle(hMutex);

[席戛戛]

引用 5 楼 zhao4zhong1 的回复:

 HANDLE hMutex;
    hMutex = CreateMutex(NULL, FALSE, "YourProgramName" );
    if ( WaitForSingleObject(hMutex, 1000) == WAIT_TIMEOUT ) {
        // There is another instance out there, but it is taking to long to
        // locate, just exit
        return FALSE;
    }
    if ( GetLastError() == ERROR_ALREADY_EXISTS ) {
        ReleaseMutex(hMutex);
        return FALSE;
    }
……
    ReleaseMutex(hMutex);
    CloseHandle(hMutex);

//oneinstance如下 BOOL CtestkeyboardApp::oneinstance() { /****/ //唯一 HANDLE hMutex = NULL; TCHAR *lpszName = "TestMutex"; hMutex = ::CreateMutex(NULL, FALSE, lpszName); DWORD dwRet = ::GetLastError(); if (hMutex) { if (ERROR_ALREADY_EXISTS == dwRet) { AfxMessageBox("Has been running"); CloseHandle(hMutex); // should be closed return FALSE; } } else { //创建失败 } // ::CloseHandle(hMutex); // Add this code in Destruction function /****/ return TRUE; } CloseHandle 应该在CWinApp退出的时候关闭 互斥对象，每次调用oneinstance后，互斥对象被关闭了，难怪第二次运行，还能运行。 感谢楼上的各位

[老王爱上猫]

 if (!oneinstance())
 {
        return TRUE;
 }

试一下