这篇文章讲述了如何使用MFC将Excel工作表插入到SDI视图中。文章包括插入工作表并将文字添加到A1单元格的详细步骤，每一步都有详细说明。 虽然你可以直接将代码插入到你的程序中，但理解这些例子你才会真正受益。
更多信息
以下是创建这个MFC应用程序的步骤：
1.使用AppWizard创建一个新的MFC AppWizard(EXE)工程，命名为"Embed_Excel"
2.选择单文档视图(SDI)结构，在第3步中需要选中Container,以提供容器支持。
其它都为默认。
产生以下类：
应用类: CEmbed_ExcelApp in Embed_Excel.h and Embed_Excel.cpp
框架类: CMainFrame in MainFrm.h and MainFrm.cpp
文档类: CEmbed_ExcelDoc in Embed_ExcelDoc.h and Embed_ExcelDoc.cpp
视图类: CEmbed_ExcelView in Embed_ExcelView.h and Embed_ExcelView.cpp
容器类: CEmbed_ExcelCntrItem in CntrItem.h and CntrItem.cpp
3.在VIEW菜单中，选ClassWizard,选Automation选项卡,选Add Class,选择From a TypeLibrary, 选中Microsoft Excel 97/2000 类型库:Excel8.olb或Excel9.olb(在Microsoft Office\Office目录下) 会将类型库中的所有类添加到你的工程中。
4.在CntrItem.h中为CEmbed_ExcelCntrItem类添加如下函数定义：
LPDISPATCH GetIDispatch();
5.然后在CntrItem.cpp中添加GetIDispatch方法
示例代码
-----------
/*******************************************************************
* This method returns the IDispatch* for the application linked to
* this container.
********************************************************************/
LPDISPATCH CEmbed_ExcelCntrItem::GetIDispatch()
{
//The this and m_lpObject pointers must be valid for this function
//to work correctly. The m_lpObject is the IUnknown pointer to
// this object.
ASSERT_VALID(this);
ASSERT(m_lpObject != NULL);
LPUNKNOWN lpUnk = m_lpObject;
//The embedded application must be running in order for the rest
//of the function to work.
Run();
//QI for the IOleLink interface of m_lpObject.
LPOLELINK lpOleLink = NULL;
if (m_lpObject->QueryInterface(IID_IOleLink,
(LPVOID FAR*)&lpOleLink) == NOERROR)
{
ASSERT(lpOleLink != NULL);
lpUnk = NULL;
//Retrieve the IUnknown interface to the linked application.
if (lpOleLink->GetBoundSource(&lpUnk) != NOERROR)
{
TRACE0("Warning: Link is not connected!\n");
lpOleLink->Release();
return NULL;
}
ASSERT(lpUnk != NULL);
}
//QI for the IDispatch interface of the linked application.
LPDISPATCH lpDispatch = NULL;
if (lpUnk->QueryInterface(IID_IDispatch, (LPVOID FAR*)&lpDispatch)
!=NOERROR)
{
TRACE0("Warning: does not support IDispatch!\n");
return NULL;
}
//After assuring ourselves it is valid, return the IDispatch
//interface to the caller.
ASSERT(lpDispatch != NULL);
return lpDispatch;
}
6.在Embed_ExcelView.h中为CEmbed_ExcelView类添加如下函数定义:
void EmbedAutomateExcel();
7.然后在Embed_ExcelView.cpp中添加EmbedAutomateExcel方法:
示例代码
-----------
/********************************************************************
* This method encapsulates the process of embedding an Excel
* Worksheet in a View object and automating that worksheet to add
* some text to cell A1.
********************************************************************/
void CEmbed_ExcelView::EmbedAutomateExcel()
{
//Change the cursor so the user knows something exciting is going
//on.
BeginWaitCursor();
CEmbed_ExcelCntrItem* pItem = NULL;
TRY
{
//Get the document associated with this view, and be sure it’s
//valid.
CEmbed_ExcelDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
//Create a new item associated with this document, and be sure
//it’s valid.
pItem = new CEmbed_ExcelCntrItem(pDoc);
ASSERT_VALID(pItem);
// Get Class ID for Excel sheet.
// This is used in creation.
CLSID clsid;
if(FAILED(::CLSIDFromProgID(L"Excel.sheet",&clsid)))
//Any exception will do. We just need to break out of the
//TRY statement.
AfxThrowMemoryException();
// Create the Excel embedded item.
if(!pItem->CreateNewItem(clsid))
//Any exception will do. We just need to break out of the
//TRY statement.
AfxThrowMemoryException();
//Make sure the new CContainerItem is valid.
ASSERT_VALID(pItem);
// Launch 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);
//Query for the dispatch pointer for the embedded object. In
//this case, this is the Excel worksheet.
LPDISPATCH lpDisp;
lpDisp = pItem->GetIDispatch();
//Add text in cell A1 of the embedded Excel sheet
_Workbook wb;
Worksheets wsSet;
_Worksheet ws;
Range range;
_Application app;
//set _Workbook wb to use lpDisp, the IDispatch* of the
//actual workbook.
wb.AttachDispatch(lpDisp);
//Then get the worksheet’s application.
app = wb.GetApplication();
//Then get the first worksheet in the workbook
wsSet = wb.GetWorksheets();
ws = wsSet.GetItem(COleVariant((short)1));
//From there, get a Range object corresponding to cell A1.
range = ws.GetRange(COleVariant("A1"), COleVariant("A1"));
//Fill A1 with the string "Hello, World!"
range.SetValue(COleVariant("Hello, World!"));
}
//Here, we need to do clean up if something went wrong.
CATCH(CException, e)
{
if (pItem != NULL)
{
ASSERT_VALID(pItem);
pItem->Delete();
}
AfxMessageBox(IDP_FAILED_TO_CREATE);
}
END_CATCH
//Set the cursor back to normal so the user knows exciting stuff
//is no longer happening.
EndWaitCursor();
}
将下面一行添加到 Embed_ExcelView.h:
#include "excel8.h"
注意:如果使用Excel 2000, 头文件是 "excel9.h."
看一下View类中的 OnInsertObject() 方法，对其中的注释引起了我们的兴趣，因为它和我们刚写的方法有惊人的相似。事实上，我们刚才写的是OnInsertObject()的一个特例：允许用户从可用的OLE对象列表中选择其一插入到应用程序中。因为我们只想对Excel工作表进行自动化，所以派生这一行为。在我们的程序中，我们移去了InsertObject()内部的所有代码，用如上EmbedAutomateExcel()中的代码代替，或者你可以在InsertObject()函数中直接调用EmbedAutomateExcel()。
编译并运行我们的程序。
在编辑菜单中选择 插入新对象.
运行结果：一张Microsoft Excel 工作表插入到视图中；并且通过自动化，A1单元格被填上"Hello, World!" 字符串。
