39 lines
951 B
39 lines
951 B
7 years ago
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#ifndef LimitSingleInstance_H
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#define LimitSingleInstance_H
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#include <windows.h>
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//This code is from Q243953 in case you lose the article and wonder
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//where this code came from.
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class CLimitSingleInstance
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{
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protected:
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DWORD m_dwLastError;
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HANDLE m_hMutex;
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public:
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CLimitSingleInstance(TCHAR *strMutexName)
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{
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//Make sure that you use a name that is unique for this application otherwise
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//two apps may think they are the same if they are using same name for
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//3rd parm to CreateMutex
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m_hMutex = CreateMutex(NULL, FALSE, strMutexName); //do early
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m_dwLastError = GetLastError(); //save for use later...
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}
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~CLimitSingleInstance()
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{
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if (m_hMutex) //Do not forget to close handles.
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{
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CloseHandle(m_hMutex); //Do as late as possible.
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m_hMutex = NULL; //Good habit to be in.
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}
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}
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BOOL IsAnotherInstanceRunning()
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{
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return (ERROR_ALREADY_EXISTS == m_dwLastError);
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}
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};
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#endif
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