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// OneInstance.h: interface for the COneInstance class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_ONEINSTANCE_H__A3059F66_BFED_11D2_A501_0020182B97FC__INCLUDED_)
#define AFX_ONEINSTANCE_H__A3059F66_BFED_11D2_A501_0020182B97FC__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include <string>
class COneInstance
{
public:
// Constructor
COneInstance(LPCSTR szID)
: sMtxName(szID) {};
// Activates a Window based on the following...
// szClass: Class name of Window (get from SPY)
// szTitle: Title bar of Window
bool FindAndActivate(LPCSTR szClass, LPCSTR szTitle) const
{
// Search for the Window
HWND hWnd = ::FindWindow(szClass, szTitle);
// Check if we have any popups
HWND hChild = GetLastActivePopup(hWnd);
bool bRet = SetForegroundWindow(hWnd) ? true : false; // bring main window to top
if (hWnd != hChild)
SetForegroundWindow(hChild); // a pop-up window is active
// bring it to the top too
// do not run second instance
return bRet;
}
// Checks if there is already a program loaded
// with the ID passed when creating COneInstance
bool IsAlreadyLoaded() const
{
if(sMtxName.empty())
return false;
// Use a Mutex and not a FindWindow because process could exist
// without a Window (
::CreateMutex(NULL, true, sMtxName.c_str());
// mutex will be automatically deleted when process ends
return (::GetLastError() == ERROR_ALREADY_EXISTS);
}
protected:
std::string sMtxName;
};
#endif // !defined(AFX_ONEINSTANCE_H__A3059F66_BFED_11D2_A501_0020182B97FC__INCLUDED_)
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