在工作中有时需要可以打开Ole文档的控件,微软提供了DsoFramer控件的源代码,但DsoFramer在使用的过程中遇到很多的Bug,于是自己尝试借用文档视图结构写一个自己的打开Ole文档的控件。 1。启动C++6.0,创建MFC ActiveX ControlWizard类型的项目,这里用TestCtrl作为项目名称,向导自动生成CTestCtrlCtrl类。 2。启动另一个C++6.0,创建单文档的应用程序,支持Ole容器和ActiveX,这里用SDI作为项目名称。 3。将SDI工程中的MainFrm.cpp,MainFrm.h,SDIView.cpp,SDIView.h,SDIDoc.cpp,SDIDoc.h,CntrItem.cpp,CntrItem.h加入TestCtrl项目中,并将这些文件的#include "SDI.h"除去。 4。在控件类CTestCtrlCtrl头文件中加入CMainFrame * m_pMainFrame;在CTestCtrlCtrl类的OnCreate虚函数中加如下代码创建主框架: RECT rect; this->GetClientRect(&rect); m_pMainFrame = new CMainFrame; m_pMainFrame->Create(NULL,"Frame",WS_CHILD|WS_VISIBLE,rect,(CWnd*)this); 这样创建的框架将被控件包含。如果加上WS_OVERLAPPEDWINDOW风格,将会看到有趣的现象。 在CMainFrame类中加入下列成员: CCreateContext * m_pCctext; CSDIDoc * m_pSDIDoc; CSingleDocTemplate* m_pNewDocTemplate; 框架创建函数改动如下: 给文档类增加个public函数SetTemplate void CSDIDoc::SetTemplate(CDocTemplate* p) { this->m_pDocTemplate = p; // TODO: add one-time construction code here } int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) { m_pSDIDoc = new CSDIDoc; m_pSDIDoc->OnNewDocument(); m_pNewDocTemplate = new CSingleDocTemplate( IDR_MENU1, RUNTIME_CLASS(CSDIDoc), RUNTIME_CLASS(CMainFrame), // main SDI frame window RUNTIME_CLASS(CSDIView)); m_pCctext = new CCreateContext; m_pCctext->m_pCurrentDoc = m_pSDIDoc; m_pCctext->m_pCurrentFrame = this; m_pCctext->m_pLastView = NULL; m_pCctext->m_pNewDocTemplate = m_pNewDocTemplate; m_pCctext->m_pNewViewClass = RUNTIME_CLASS(CSDIView); lpCreateStruct->lpCreateParams = m_pCctext; m_pNewDocTemplate->AddDocument(m_pSDIDoc); m_pSDIDoc->SetTemplate(m_pNewDocTemplate); if (CFrameWnd::OnCreate(lpCreateStruct) == -1)//改动的lpCreateStruct作为参数传入。 return -1; POSITION pos = m_pSDIDoc->GetFirstViewPosition();//将创建的新视图设置为当前视图,以便框架使用GetActiveView函数。 while (pos != NULL) { CView* pView = m_pSDIDoc->GetNextView(pos); ASSERT_VALID(pView); this->SetActiveView(pView); } return 0;//这里删除了以前框架的代码,不删除也可。 } 重写 CSDICntrItem虚函数,什么都不做,将不加入Ole服务器程序给我们的菜单 void CSDICntrItem::OnInsertMenus(CMenu* pMenuShared,LPOLEMENUGROUPWIDTHS lpMenuWidths) { } 5.响应控件的WM_SIZE消息,加入如下代码: m_pMainFrame->SetWindowPos(&CWnd::wndTop,0,0,cx,cy,SWP_NOMOVE); 这样,支持Ole容器的文档视图结构就嵌入到控件中来了。 若给控件加入Open(LPCTSTR path) 和Close() Com接口函数,主框架和视图也相应加入public函数Open(LPCTSTR path) 和Close() 控件中: void CTestCtrlCtrl::Open(LPCTSTR Path) { // TODO: Add your dispatch handler code here m_pMainFrame->AssertValid(); if(m_pMainFrame != NULL) { m_pMainFrame->Close(); m_pMainFrame->Open(Path); } } void CTestCtrlCtrl::Close() { // TODO: Add your dispatch handler code here m_pMainFrame->AssertValid(); if(m_pMainFrame != NULL) m_pMainFrame->Close(); } 关闭控件时候通知框架: void CTestCtrlCtrl::OnDestroy() { COleControl::OnDestroy(); m_pMainFrame->SendMessage(WM_CLOSE); } 主框架中: void CMainFrame::Open(LPCSTR Path) { CSDIView * pView = (CSDIView *)this->GetActiveView(); if(pView != NULL) { pView->AssertValid(); pView->Open(Path); } // TODO: Add your message handler code here } void CMainFrame::Close() { CSDIView * pView = (CSDIView *)this->GetActiveView(); if(pView != NULL) { pView->AssertValid(); pView->Close(); } // TODO: Add your message handler code here } 视图中: void CSDIView::Close() { COleClientItem* pActiveItem = GetDocument()->GetInPlaceActiveItem(this); if (pActiveItem != NULL && pActiveItem->GetActiveView() == this) { // pActiveItem->Deactivate(); pActiveItem->Delete(); pActiveItem->Release(); ASSERT(GetDocument()->GetInPlaceActiveItem(this) == NULL); } } void CSDIView::Open(LPCSTR path) { //Change the cursor so that the user knows that something exciting is going //on. BeginWaitCursor(); CSDICntrItem* pItem = NULL; TRY { //Get the document associated with this view, and be sure that it is //valid. CSDIDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); //Create a new item associated with this document, and be sure that //it is valid. pItem = new CSDICntrItem(pDoc); ASSERT_VALID(pItem); // Create the Excel embedded item. if(!pItem->CreateFromFile(path)) AfxThrowMemoryException(); //Make sure the new CContainerItem is valid. ASSERT_VALID(pItem); this->AssertValid(); // Start the server to edit the item. pItem->DoVerb(OLEIVERB_SHOW, this); // As an arbitrary user interface design, this sets the // selection to the last item inserted. m_pSelection = pItem; // Set selection to last inserted. item pDoc->UpdateAllViews(NULL); } } 这样,借助了MFC文档视图结构,一个Ole文档察看器大体完成了。 顾冬岩 2005 . 4 . 5

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