instancecheck.cpp

c++系统开发实例精粹内附的80例源代码 环境:windows2000,c++6.0

//////////////////////////////////////////////////////////////////////
// FileFury
// Copyright (c) 2000 Tenebril Incorporated
// All rights reserved.
//
// This source code is governed by the Tenebril open source
// license (http://www.tenebril.com/developers/opensource/license.html)
//
// For more information on this and other open source applications,
// visit the Tenebril OpenSource page:
//       http://www.tenebril.com/developers/opensource
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "InstanceCheck.h"

CInstanceCheck::CInstanceCheck()
{
	m_hMutex = NULL;
}

CInstanceCheck::~CInstanceCheck()
{
	if(m_hMutex)
	{
		ReleaseMutex(m_hMutex);

		while(GlobalFindAtom(m_strClassName) != 0)
			GlobalDeleteAtom(GlobalFindAtom(m_strClassName));
	}

	return;
}

bool CInstanceCheck::Create(LPCTSTR lpClassName, bool RegisterWindow, 
							bool BringToTop)
{
	m_strClassName = lpClassName;

	m_strClassName += _T(" Class");

	m_hMutex = CreateMutex(NULL, FALSE, m_strClassName);
	if(GetLastError() == ERROR_ALREADY_EXISTS && GlobalFindAtom(m_strClassName) != 0)
	{
		/* Instance is already running */
		m_hMutex = NULL;

		if(BringToTop)
		{
			HWND hWnd = FindWindowEx(NULL, NULL, m_strClassName, NULL);
			if(hWnd)
			{
				ShowWindow(hWnd, SW_RESTORE);
				BringWindowToTop(hWnd);
				SetForegroundWindow(hWnd);
			}
		}

		return false;
	}

	GlobalAddAtom(m_strClassName);

	if(RegisterWindow)
	{
		WNDCLASS wndcls;
		
		memset(&wndcls, 0, sizeof(WNDCLASS));
		wndcls.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
		wndcls.lpfnWndProc = AfxWndProc;
		wndcls.hInstance = AfxGetInstanceHandle();
		wndcls.hIcon = (HICON)NULL;
		wndcls.hCursor = LoadCursor(wndcls.hInstance, IDC_ARROW);
		wndcls.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
		wndcls.lpszMenuName = NULL;
		wndcls.lpszClassName = m_strClassName;

		if(!AfxRegisterClass(&wndcls))
		{
			AfxMessageBox(_T("Failed to register window class!"), 
				MB_ICONSTOP | MB_OK );
			return false;
		}
	}

	return true;
}

CString CInstanceCheck::GetClassName()
{
	return m_strClassName;
}