C++ (MFC) 单程序运行（防止多开程序)

项目文件名:MFCAppTest

在 C*****App.cpp 文件中

CMFCAppTestApp::InitInstance 函数中
添加以下代码

	//避免程序的多开  xxxx为信号量的名字 可随意CreateMutex(NULL, TRUE, TEXT("MFCAppTest")); if (GetLastError() == ERROR_ALREADY_EXISTS){//windowname为你的主窗体的标题,当然你也可以通过进程来找到主窗体。CWnd* cwnd = CWnd::FindWindow(NULL, TEXT("MFCAppTest"));if (cwnd)//显示原先的主界面{cwnd->ShowWindow(SW_SHOWNORMAL);cwnd->SetForegroundWindow();}return FALSE;}

完整代码


// MFCAppTest.cpp : Defines the class behaviors for the application.
//#include "stdafx.h"
#include "MFCAppTest.h"
#include "MFCAppTestDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#endif// CMFCAppTestAppBEGIN_MESSAGE_MAP(CMFCAppTestApp, CWinApp)ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()// CMFCAppTestApp constructionCMFCAppTestApp::CMFCAppTestApp()
{// support Restart Managerm_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_RESTART;// TODO: add construction code here,// Place all significant initialization in InitInstance
}// The one and only CMFCAppTestApp objectCMFCAppTestApp theApp;// CMFCAppTestApp initializationBOOL CMFCAppTestApp::InitInstance()
{//避免程序的多开  xxxx为信号量的名字 可随意CreateMutex(NULL, TRUE, TEXT("MFCAppTest")); if (GetLastError() == ERROR_ALREADY_EXISTS){//windowname为你的主窗体的标题,当然你也可以通过进程来找到主窗体。CWnd* cwnd = CWnd::FindWindow(NULL, TEXT("MFCAppTest"));if (cwnd)//显示原先的主界面{cwnd->ShowWindow(SW_SHOWNORMAL);cwnd->SetForegroundWindow();}return FALSE;}// InitCommonControlsEx() is required on Windows XP if an application// manifest specifies use of ComCtl32.dll version 6 or later to enable// visual styles.  Otherwise, any window creation will fail.INITCOMMONCONTROLSEX InitCtrls;InitCtrls.dwSize = sizeof(InitCtrls);// Set this to include all the common control classes you want to use// in your application.InitCtrls.dwICC = ICC_WIN95_CLASSES;InitCommonControlsEx(&InitCtrls);CWinApp::InitInstance();AfxEnableControlContainer();// Create the shell manager, in case the dialog contains// any shell tree view or shell list view controls.CShellManager *pShellManager = new CShellManager;// Activate "Windows Native" visual manager for enabling themes in MFC controlsCMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerWindows));// Standard initialization// If you are not using these features and wish to reduce the size// of your final executable, you should remove from the following// the specific initialization routines you do not need// Change the registry key under which our settings are stored// TODO: You should modify this string to be something appropriate// such as the name of your company or organizationSetRegistryKey(_T("Local AppWizard-Generated Applications"));CMFCAppTestDlg dlg;m_pMainWnd = &dlg;INT_PTR nResponse = dlg.DoModal();if (nResponse == IDOK){// TODO: Place code here to handle when the dialog is//  dismissed with OK}else if (nResponse == IDCANCEL){// TODO: Place code here to handle when the dialog is//  dismissed with Cancel}else if (nResponse == -1){TRACE(traceAppMsg, 0, "Warning: dialog creation failed, so application is terminating unexpectedly.\n");TRACE(traceAppMsg, 0, "Warning: if you are using MFC controls on the dialog, you cannot #define _AFX_NO_MFC_CONTROLS_IN_DIALOGS.\n");}// Delete the shell manager created above.if (pShellManager != NULL){delete pShellManager;}#ifndef _AFXDLLControlBarCleanUp();
#endif// Since the dialog has been closed, return FALSE so that we exit the//  application, rather than start the application's message pump.return FALSE;
}