怎么区分OnNewDocument()函数是谁调用的?

[weiwuyuan]

在mfc单文档项目里，程序启动后会调用一次CDocument::OnNewDocument()函数，我怎么判断他是启动时触发的还是用户自己通过单击新建触发的?
启动时的那次调用能屏蔽么?

[Eleven]

引用 楼主 weiwuyuan 的回复:

在mfc单文档项目里，程序启动后会调用一次CDocument::OnNewDocument()函数，我怎么判断他是启动时触发的还是用户自己通过单击新建触发的? 启动时的那次调用能屏蔽么?

App类的InitInstance函数中调用了ProcessShellCommand(cmdInfo); 看第一个case语句就明白了

BOOL CWinApp::ProcessShellCommand(CCommandLineInfo& rCmdInfo)
{
	BOOL bResult = TRUE;
	switch (rCmdInfo.m_nShellCommand)
	{
	case CCommandLineInfo::FileNew:
		if (!AfxGetApp()->OnCmdMsg(ID_FILE_NEW, 0, NULL, NULL))
			OnFileNew();
		if (m_pMainWnd == NULL)
			bResult = FALSE;
		break;

		// If we've been asked to open a file, call OpenDocumentFile()

	case CCommandLineInfo::FileOpen:
		if (!OpenDocumentFile(rCmdInfo.m_strFileName))
			bResult = FALSE;
		break;

		// If the user wanted to print, hide our main window and
		// fire a message to ourselves to start the printing

	case CCommandLineInfo::FilePrintTo:
	case CCommandLineInfo::FilePrint:
		m_nCmdShow = SW_HIDE;
		ASSERT(m_pCmdInfo == NULL);
		if(OpenDocumentFile(rCmdInfo.m_strFileName))
		{
			m_pCmdInfo = &rCmdInfo;
			ENSURE_VALID(m_pMainWnd);
			m_pMainWnd->SendMessage(WM_COMMAND, ID_FILE_PRINT_DIRECT);
			m_pCmdInfo = NULL;
		}
		bResult = FALSE;
		break;

		// If we're doing DDE, hide ourselves

	case CCommandLineInfo::FileDDE:
		m_pCmdInfo = (CCommandLineInfo*)(UINT_PTR)m_nCmdShow;
		m_nCmdShow = SW_HIDE;
		break;

	// If we've been asked to register, exit without showing UI.
	// Registration was already done in InitInstance().
	case CCommandLineInfo::AppRegister:
		{
			Register();			
			bResult = FALSE;    // that's all we do

			// If nobody is using it already, we can use it.
			// We'll flag that we're unregistering and not save our state
			// on the way out. This new object gets deleted by the
			// app object destructor.

			if (m_pCmdInfo == NULL)
			{
				m_pCmdInfo = new CCommandLineInfo;
				m_pCmdInfo->m_nShellCommand = CCommandLineInfo::AppUnregister;
			}
			break;
		}

	// If we've been asked to unregister, unregister and then terminate
	case CCommandLineInfo::AppUnregister:
		{
			BOOL bUnregistered = Unregister();

			// if you specify /EMBEDDED, we won't make an success/failure box
			// this use of /EMBEDDED is not related to OLE

			if (!rCmdInfo.m_bRunEmbedded)
			{
				if (bUnregistered)
					AfxMessageBox(AFX_IDP_UNREG_DONE);
				else
					AfxMessageBox(AFX_IDP_UNREG_FAILURE);
			}
			bResult = FALSE;    // that's all we do

			// If nobody is using it already, we can use it.
			// We'll flag that we're unregistering and not save our state
			// on the way out. This new object gets deleted by the
			// app object destructor.

			if (m_pCmdInfo == NULL)
			{
				m_pCmdInfo = new CCommandLineInfo;
				m_pCmdInfo->m_nShellCommand = CCommandLineInfo::AppUnregister;
			}
		}
		break;
	}
	return bResult;
}

SDI好像是不可以屏蔽的，MDI可以

[babala2009]

2楼每次都能回答道点子上

[weiwuyuan]

引用 1 楼 VisualEleven 的回复:

引用 楼主 weiwuyuan 的回复: 在mfc单文档项目里，程序启动后会调用一次CDocument::OnNewDocument()函数，我怎么判断他是启动时触发的还是用户自己通过单击新建触发的? 启动时的那次调用能屏蔽么? App类的InitInstance函数中调用了ProcessShellCommand(cmdInfo); 看第一个case语句就明白了 C/C++ co……

那就是没办法解决了?

[Eleven]

引用 3 楼 weiwuyuan 的回复:

引用 1 楼 VisualEleven 的回复: 引用 楼主 weiwuyuan 的回复: 在mfc单文档项目里，程序启动后会调用一次CDocument::OnNewDocument()函数，我怎么判断他是启动时触发的还是用户自己通过单击新建触发的? 启动时的那次调用能屏蔽么? App类的InitInstance函数中调用了ProcessShellCommand(cmdInfo); 看第……

MFC的SDI框架就是这样的，没办法，除非你用MDI

[weiwuyuan]

引用 4 楼 VisualEleven 的回复:

引用 3 楼 weiwuyuan 的回复: 引用 1 楼 VisualEleven 的回复: 引用 楼主 weiwuyuan 的回复: 在mfc单文档项目里，程序启动后会调用一次CDocument::OnNewDocument()函数，我怎么判断他是启动时触发的还是用户自己通过单击新建触发的? 启动时的那次调用能屏蔽么? App类的InitInstance函数中调用了ProcessShe……

恩, 我还是用个布尔量标记一下吧