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