利用VC对Excel进行操作

利用VC对Excel进行操作，可以对一个目录下的所有Excel表进行处理。主要代码如下：

//获取一个目录下所有Excel表名，并加入到一个数组中。
char oldPath[MAX_PATH];
 getcwd(oldPath,MAX_PATH);
 chdir(m_strDirectory);
 CFileFind fileFind;
 BOOL bExist=FALSE;
 bExist=fileFind.FindFile("*.xls");
 while(bExist)
 {
  bExist=fileFind.FindNextFile();
  CString strTitle=fileFind.GetFileTitle(); 
  m_strTableAll.Add(strTitle);
 }
 fileFind.Close();
 chdir(oldPath);
 
 
//处理所有Excel数据，并把所有数据加入到一个二维数组中
CString m_strArray[i][j]
 
CoInitialize(NULL);
 int i,j;  //用来循环
 // 获得EXCEL的CLSID
 CLSID clsid;
 HRESULT hr = CLSIDFromProgID(L"Excel.Application", &clsid);
 
 if(FAILED(hr)) {
  AfxMessageBox("CLSIDFromProgID() 函数调用失败!");
  return;
 }
 
 // 创建实例
 IDispatch *pXlApp;
 hr = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, IID_IDispatch, (void **)&pXlApp);
 if(FAILED(hr)) {
  AfxMessageBox("请检查是否已经安装EXCEL!");
  return;
 }
 
 // 显示，将Application.Visible属性置1
 /VARIANT x;
 x.vt = VT_I4;
 x.lVal = 1;
 AutoWrap(DISPATCH_PROPERTYPUT, NULL, pXlApp, L"Visible", 1, x);
 // 获取Workbooks集合
 IDispatch *pXlBooks;
 {
  VARIANT result;
  VariantInit(&result);
  AutoWrap(DISPATCH_PROPERTYGET, &result, pXlApp, L"Workbooks", 0);
  pXlBooks = result.pdispVal;
 }
 
 CString strName;  //Excel表完整路径
 CString strTmp;   //临时变量，保存单元格数据中的CString型
 double dblTmp;   //临时变量，保存单元格数据中的double型
 //用来保存信息的数组
 VARIANT arr;
 arr.vt = VT_ARRAY | VT_VARIANT;
 SAFEARRAYBOUND sab[2];
 sab[0].lLbound = 1; sab[0].cElements = 40;
 sab[1].lLbound = 1; sab[1].cElements = 16;
 arr.parray = SafeArrayCreate(VT_VARIANT, 2, sab);
 int tableNum;
 int nCount=m_DataConn.m_strTableAll.GetSize(); 
 for(tableNum=0;tableNum<nCount;tableNum++)
 {
  strName.Format("%s\\%s",m_DataConn.m_strDirectory,m_DataConn.m_strTableAll.GetAt(tableNum));
    
  // 调用Workbooks.Open()方法，打开一个已经存在的Workbook
  IDispatch *pXlBook;
  {
   VARIANT parm;
   parm.vt = VT_BSTR;
   // parm.bstrVal = ::SysAllocString(L"''strName''");
   parm.bstrVal=strName.AllocSysString();
   VARIANT result;
   VariantInit(&result);
   AutoWrap(DISPATCH_PROPERTYGET, &result, pXlBooks, L"Open", 1,parm);
   pXlBook = result.pdispVal;
  }
  
  // 初始化数组内容
  /*
  for(int i=1; i<=15; i++) {
  for(int j=1; j<=15; j++) {
  VARIANT tmp;
  tmp.vt = VT_BSTR;
  wsprintfW(szTmp,L"%i,%i",i,j);
  tmp.bstrVal = SysAllocString(szTmp);
  // 添加数据到数组中
  long indices[] = {i,j};
  SafeArrayPutElement(arr.parray, indices, (void *)&tmp);
  }
  }
  */
  // 从Application.ActiveSheet属性获得Worksheet对象
  IDispatch *pXlSheet;
  {
   VARIANT result;
   VariantInit(&result);
   AutoWrap(DISPATCH_PROPERTYGET, &result, pXlApp, L"ActiveSheet", 0);
   pXlSheet = result.pdispVal;
  }
  
  // 选择一个16x40大小的Range
  IDispatch *pXlRange;
  {
   VARIANT parm;
   parm.vt = VT_BSTR;
   parm.bstrVal = ::SysAllocString(L"A1:P40");
   
   VARIANT result;
   VariantInit(&result);
   AutoWrap(DISPATCH_PROPERTYGET, &result, pXlSheet, L"Range", 1, parm);
   VariantClear(&parm);
   
   pXlRange = result.pdispVal;
  }
  // 用这个Range读取数据
  AutoWrap(DISPATCH_PROPERTYGET, &arr, pXlRange, L"Value",0);
  for(i=1; i<=40; i++)
  {
   for(j=1; j<=16; j++)
   {
    VARIANT tmp;
    //tmp.vt = VT_BSTR;
    // 添加数据到数组中
    long indices[] = {i,j};
    SafeArrayGetElement(arr.parray, indices, (void *)&tmp);
    if(tmp.vt ==VT_BSTR)
    {
     strTmp=tmp.bstrVal;
    }
    else if(tmp.vt==VT_R8)
    {
     dblTmp=tmp.dblVal;
     strTmp.Format("%f",dblTmp);
    }
    else if(tmp.vt=VT_NULL)
    {
     strTmp="";
    }
    _bstr_t str1=strTmp; 
    WCHAR *str2=str1;
    pDoc->m_strArray[tableNum*40+i][j]=str2;
   }
  }
  AutoWrap(DISPATCH_METHOD, NULL, pXlBook, L"Close", 0);
  VariantClear(&arr);
  pXlRange->Release();
  pXlSheet->Release();
  pXlBook->Release();
 }
 // 退出，调用Application.Quit()方法
 // 释放所有的接口以及变量
 AutoWrap(DISPATCH_METHOD, NULL, pXlApp, L"Quit", 0);
 pXlBooks->Release();
 pXlApp->Release();
 
 // 注销COM库
 CoUninitialize();
 
//**********************//
// AutoWrap 函数的正体
// 先声明：这个函数不是偶写的
// AutoWrap() - Automation helper function...
HRESULT CExcelView::AutoWrap(int autoType, VARIANT *pvResult, IDispatch *pDisp, LPOLESTR ptName, int cArgs...)
{
    // Begin variable-argument list...
    va_list marker;
    va_start(marker, cArgs);
    if(!pDisp) {    
  AfxMessageBox("NULL IDispatch passed to AutoWrap()");
        _exit(0);
    }
    // Variables used...
    DISPPARAMS dp = { NULL, NULL, 0, 0 };
    DISPID dispidNamed = DISPID_PROPERTYPUT;
    DISPID dispID;
    HRESULT hr;
    char buf[200];
    char szName[200];
    // Convert down to ANSI
    WideCharToMultiByte(CP_ACP, 0, ptName, -1, szName, 256, NULL, NULL);
    // Get DISPID for name passed...
    hr = pDisp->GetIDsOfNames(IID_NULL, &ptName, 1, LOCALE_USER_DEFAULT, &dispID);
    if(FAILED(hr)) {
        sprintf(buf, "IDispatch::GetIDsOfNames(\"%s\") failed w/err 0x%08lx", szName, hr);
        AfxMessageBox(buf);
        _exit(0);
        return hr;
    }
    // Allocate memory for arguments...
    VARIANT *pArgs = new VARIANT[cArgs+1];
    // Extract arguments...
    for(int i=0; i<cArgs; i++) {
        pArgs[i] = va_arg(marker, VARIANT);
    }
    // Build DISPPARAMS
    dp.cArgs = cArgs;
    dp.rgvarg = pArgs;
    // Handle special-case for property-puts!
    if(autoType & DISPATCH_PROPERTYPUT) {
        dp.cNamedArgs = 1;
        dp.rgdispidNamedArgs = &dispidNamed;
    }
    // Make the call!
    hr = pDisp->Invoke(dispID, IID_NULL, LOCALE_SYSTEM_DEFAULT, autoType, &dp, pvResult, NULL, NULL);
    if(FAILED(hr)) {
        sprintf(buf, "IDispatch::Invoke(\"%s\"=%08lx) failed w/err 0x%08lx", szName, dispID, hr);
        AfxMessageBox(buf);
        _exit(0);
        return hr;
    }
    // End variable-argument section...
    va_end(marker);
    delete [] pArgs;
    return hr;
} 

文章出处：http://www.diybl.com/course/3_program/vc/vc_js/2008114/96483_2.html