1 files changed, 63 insertions, 0 deletions
diff --git a/Common/OneInstance.h b/Common/OneInstance.h
new file mode 100644
index 0000000..5eec36f
--- /dev/null
+++ b/Common/OneInstance.h
@@ -0,0 +1,63 @@
+// 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_)