MFC程序只运行单个实例 的简单示例

这里只是简单的建立一个MFC 程序来演示 只运行一个实例。

// 在头文件中添加类似如下代码

#define SCANSETTINGS_CLASSNAME _T("ScanSettingsWindowClass")

#define APPMUTEX _T("Global\\ScanSettings")

 virtual int ExitInstance();

private:

 HANDLE m_hMutex;

 // Implementation 

 BOOL RestrictOneInstance();

// 在源文件中添加如下代码

BOOL CXXXApp::InitInstance()

{

 // Begin.  把这段代码加在最前面即可

 if (!RestrictOneInstance())

 {

  return FALSE;

 }

 WNDCLASS wc;

 ::GetClassInfo(AfxGetInstanceHandle(), _T("#32770"), &wc);

 wc.lpszClassName = SCANSETTINGS_CLASSNAME;

 AfxRegisterClass(&wc);

 // End

//...........................

}

BOOL CXXXApp::RestrictOneInstance()

{

 SECURITY_DESCRIPTOR secutityDese;

 ::InitializeSecurityDescriptor(&secutityDese, SECURITY_DESCRIPTOR_REVISION);

 ::SetSecurityDescriptorDacl(&secutityDese, TRUE, NULL, FALSE);

 SECURITY_ATTRIBUTES securityAttr;

 securityAttr.nLength = sizeof SECURITY_ATTRIBUTES;

 securityAttr.bInheritHandle = FALSE;

 securityAttr.lpSecurityDescriptor = &secutityDese;

 m_hMutex = ::CreateMutex(&securityAttr, FALSE, APPMUTEX);

 BOOL bLaunched = (m_hMutex != NULL && ERROR_ALREADY_EXISTS == GetLastError());

 CWnd *pWndPrev = NULL;

 CWnd *pWndChild = NULL;

 if (pWndPrev == NULL)

 {

  pWndPrev = CWnd::FindWindow(SCANSETTINGS_CLASSNAME, NULL);

 }

 if (pWndPrev != NULL)

 {

  // If so, does it have any popups?

  pWndChild = pWndPrev->GetLastActivePopup();

  // If iconic, restore the main window

  if (pWndPrev->IsIconic())

  {

   pWndPrev->ShowWindow(SW_RESTORE);

  }

  // Bring the main window or its popup to

  // the foreground

  pWndChild->SetForegroundWindow();

  return FALSE;

 }

 return TRUE;

}

int CXXXApp::ExitInstance()

{

 // TODO: Add your specialized code here and/or call the base class

 if (m_hMutex != NULL)

 {

  CloseHandle(m_hMutex);

  m_hMutex = NULL;

 }

 return CWinApp::ExitInstance();

}

//在资源脚本中也应修改

IDD_XXX_DIALOG DIALOGEX 0, 0, 331, 151

STYLE DS_SETFONT | DS_FIXEDSYS | WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME

EXSTYLE WS_EX_APPWINDOW

CAPTION "XXXXXXXXXX"

CLASS "ScanSettingsWindowClass"  //添加这句

FONT 8, "MS Shell Dlg", 0, 0, 0x1

BEGIN

    LTEXT           "",IDC_STATIC1,0,0,330,129,0,WS_EX_TRANSPARENT

    PUSHBUTTON      "重签",IDC_BUTTON1,71,132,62,19

    PUSHBUTTON      "确定",IDC_BUTTON2,175,132,62,19

END