在MFC程序中如何设置窗口的ClassName

[houyb_vc]

[phoenixtree]

我刚抄了一个让应用程序只运行一个实例的代码，不知能不能帮上忙

BOOL CDlgApp::InitInstance()
{
///////////////////////////////////这一段是要加的
HANDLE hSem = CreateSemaphore( NULL, 1, 1, m_pszAppName );
if ( GetLastError() == ERROR_ALREADY_EXISTS )
{
CloseHandle(hSem);
HWND hWndPrevious = ::GetWindow( ::GetDesktopWindow(), GW_CHILD );
while ( ::IsWindow(hWndPrevious) )
{
if ( ::GetProp( hWndPrevious, m_pszAppName ) )
{
if ( ::IsIconic(hWndPrevious) )
::ShowWindow( hWndPrevious, SW_RESTORE );
::SetForegroundWindow(hWndPrevious);
::SetForegroundWindow(::GetLastActivePopup(hWndPrevious));
return FALSE;
}
hWndPrevious = ::GetWindow( hWndPrevious, GW_HWNDNEXT );
}
return FALSE;
}
////////////////////////////////////////////到此为止
AfxEnableControlContainer();

// 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.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

SetRegistryKey(_T("abc"));

CDlgDlg dlg;
m_pMainWnd = &dlg;
int 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
}

// Since the dialog has been closed, return FALSE so that we exit the
// application, rather than start the application's message pump.
return FALSE;
}


int CDlgDlg::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CDialog::OnCreate(lpCreateStruct) == -1)
return -1;

// TODO: Add your specialized creation code here

::SetProp( m_hWnd, ::AfxGetApp()->m_pszAppName, (HANDLE)1 );//加这句

return 0;
}


void CDlgDlg::OnDestroy()
{
CDialog::OnDestroy();

// TODO: Add your message handler code here

::RemoveProp( m_hWnd, ::AfxGetApp()->m_pszAppName );//加这句

}

就可以实现了

[houyb_vc]

to:phoenixtree
你提供的程序解决了只运行一个实例的问题

[hide]

重载窗口的 PreCreateWindow( CREATESTRUCT& cs );函数
可以通过修改参数cs中的lpszClass的值，来修改classname

[xyzboat]

你是什么意思？
窗口的Class Name 在创建时就应该被指定;如果你用CButton等的成员函数直接创建时,Class Name 时可以不用指定.你的设置是什么意思呢?你的目的是什么呢？

[houyb_vc]

在MFC基于对话框的程序中如何设置窗口的ClassName

为了让程序不能同时运行两次以上,我想通过设置窗口的ClassName值来实现,我在程序启动时加入
FindWindow函数检测窗口是否存在,如果已运行就退出.现在问题是无法更改ClassName的值.

不知还有什么办法可让程序只能运行一次

[houyb_vc]

to:hide
你的方法不行.改变不了.