SDI单文档的启动过程

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最新推荐文章于 2024-09-11 19:44:03 发布

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分类专栏： VC++

本文链接：https://blog.youkuaiyun.com/xufan123123/article/details/8466404

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本文详细介绍了SDI（单文档界面）应用程序的启动过程，包括CSDIApp::InitInstance()函数的执行，如何使用CSingleDocTemplate创建文档模板，以及如何处理命令行参数来打开新文档。在CWinApp的生命周期中，涉及到文档和框架窗口的创建，如CreateNewDocument()和CreateNewFrame()，以及OnFileNew()和OpenDocumentFile(NULL)的调用来创建新的文档实例。整个过程涉及到了C++ MFC框架下的多个类和方法，如CDocTemplate、CFrameWnd和CView的交互，展示了MFC如何管理SDI应用的文档、视图和框架窗口的创建。

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BOOL CSDIApp::InitInstance()
{
..............
CSingleDocTemplate* pDocTemplate;
pDocTemplate = new CSingleDocTemplate(
IDR_MAINFRAME,
RUNTIME_CLASS(CSDoc),
RUNTIME_CLASS(CMainFrame), // main SDI frame window
RUNTIME_CLASS(CSView));
AddDocTemplate(pDocTemplate);

// Parse command line for standard shell commands, DDE, file open
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);

// Dispatch commands specified on the command line
if (!ProcessShellCommand(cmdInfo))
return FALSE;

// The one and only window has been initialized, so show and update it.
m_pMainWnd->ShowWindow(SW_SHOW);
m_pMainWnd->UpdateWindow();
return TRUE;
}
///CSingleDocTemplate构造函数中
CSingleDocTemplate::CSingleDocTemplate(UINT nIDResource,
CRuntimeClass* pDocClass, CRuntimeClass* pFrameClass,
CRuntimeClass* pViewClass)
: CDocTemplate(nIDResource, pDocClass, pFrameClass, pViewClass)
{
m_pOnlyDoc = NULL;
}
调用了基类的CDocTemplate构造函数

CDocTemplate::CDocTemplate(UINT nIDResource, CRuntimeClass* pDocClass,
CRuntimeClass* pFrameClass, CRuntimeClass* pViewClass)
{
ASSERT_VALID_IDR(nIDResource);
ASSERT(pDocClass == NULL ||
pDocClass->IsDerivedFrom(RUNTIME_CLASS(CDocument)));
ASSERT(pFrameClass == NULL ||
pFrameClass->IsDerivedFrom(RUNTIME_CLASS(CFrameWnd)));
ASSERT(pViewClass == NULL ||
pViewClass->IsDerivedFrom(RUNTIME_CLASS(CView)));

m_nIDResource = nIDResource;
m_nIDServerResource = NULL;
m_nIDEmbeddingResource = NULL;
m_nIDContainerResource = NULL;

m_pDocClass = pDocClass;//文档对像
m_pFrameClass = pFrameClass;//框架对像
m_pViewClass = pViewClass;//视图对像
m_pOleFrameClass = NULL;
m_pOleViewClass = NULL;

m_pAttachedFactory = NULL;
m_hMenuInPlace = NULL;
m_hAccelInPlace = NULL;
m_hMenuEmbedding = NULL;
m_hAccelEmbedding = NULL;
m_hMenuInPlaceServer = NULL;
m_hAccelInPlaceServer = NULL;

// add to pStaticList if constructed as static instead of on heap
if (CDocManager::bStaticInit)
{
m_bAutoDelete = FALSE;
if (CDocManager::pStaticList == NULL)
CDocManager::pStaticList = new CPtrList;
if (CDocManager::pStaticDocManager == NULL)
CDocManager::pStaticDocManager = new CDocManager;
CDocManager::pStaticList->AddTail(this);
}
else
{
m_bAutoDelete = TRUE; // usually allocated on the heap
LoadTemplate();
}
}

在AfxWinMain函数中
pApp->InitApplication()将CDocManager::bStaticInit设为FALSE

LoadTemplate()函数代码如下,加载字符串字源
m_strDocStrings.LoadString(m_nIDResource)

void CDocTem

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