C++读取excel表格

                            C++读取excel文件

1 创建mfc程序(这里以vs2013为例)

      到这里直接点击完成即可。

2 添加读取excel文件用到的类

  2.1 打开类向导

   

   

2.2 添加类

将_Application、_Workbook、_Worksheet、Workbooks、Worksheets添加到“生成的类”中

3 添加完成后，找到相关头文件，注释/删除

      #import "D:\\software\\office2010\\Office14\\EXCEL.EXE"no_namespace

4 再次编译还是有错误

     定位错误信息，将DialogBox()改为_DialogBox()

5 添加源码(最重要的一步)

//Excel.h
#pragma once
#include "CApplication.h"
#include "CRange.h"
#include "CWorkbook.h"
#include "CWorkbooks.h"
#include "CWorksheet.h"
#include "CWorksheets.h"

class Excel
{
private:
	CString openFileName;
	CWorkbook workBook;//当前处理文件
	CWorkbooks books;//ExcelBook集合，多文件时使用
	CWorksheet workSheet;//当前使用sheet
	CWorksheets sheets;//Excel的sheet集合
	CRange currentRange;//当前操作区域

	bool isLoad;//是否已经加载了某个sheet数据

	COleSafeArray safeArray;

protected:
	static CApplication application;//Excel进程实例

public:
	Excel();
	virtual ~Excel();



	void show(bool bShow);
    
	//检查一个cell是否为字符串
	bool isCellString(long iRow, long iColumn);

	//检查一个cell是否为数值
	bool isCellInt(long iRow, long iColumn);

	//得到一个cell的string
	CString getCellString(long iRow, long iColumn);

	//得到一个cell的整数
	int getCellInt(long iRow, long iColumn);

	//得到一个cell的double数据
	double getCellDouble(long iRow, long iColumn);

	//取得行的总数
	int getRowCount();

	//取得列的整数
	int getColumnCount();

	//使用某个shell
	bool loadSheet(long tableId, bool preLoaded = false);
	bool loadSheet(CString sheet, bool preLoaded = false);


	//通过序号取得某个shell的名称
	CString getSheetName(long tableID);

	//得到sheel的总数
	int getSheetCount();




	//打开excel文件
	bool open(const char* fileName);

	//关闭打开的excel文件
	void close(bool ifSave = false);

	//另存为一个excel文件
	void saveAsXLSFile(const CString &xlsFile);

	//取得打开文件的名称
	CString getOpenFileName();

	//取得打开sheel的名称
	CString getOpenSheelName();

	//向cell中写入一个int值
	void setCellInt(long iRow, long iColumn,int newInt);

	//向cell中写入一个字符串
	void setCellString(long iRow, long iColumn, CString newString);


public:
	//初始化 Excel_OLE
	static bool initExcel();

	//释放Excel_OLE
	static void release();

	//取得列的名称
	static char* getColumnName(long iColumn);

protected:
	void preLoadSheet();



};

//Excel.cpp
#include "stdafx.h"
#include 
#include "Excel.h"


COleVariant
covTrue((short)TRUE),
covFalse((short)FALSE),
covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

CApplication Excel::application;

Excel::Excel() :isLoad(false)
{
}


Excel::~Excel()
{
	//close();
}


bool Excel::initExcel()
{
	//创建Excel 2000服务器(启动Excel)   
	if (!application.CreateDispatch(_T("Excel.application"),nullptr))
	{
		MessageBox(nullptr,_T("创建Excel服务失败,你可能没有安装EXCEL，请检查!"),_T("错误"),MB_OK);
		return FALSE;
	}

	application.put_DisplayAlerts(FALSE);
	return true;
}


void Excel::release()
{
	application.Quit();
	application.ReleaseDispatch();
	application = nullptr;
}

bool Excel::open(const char*  fileName)
{
	
	//先关闭文件
	close();

	//利用模板建立新文档
	books.AttachDispatch(application.get_Workbooks(), true);


	LPDISPATCH lpDis = nullptr;
	lpDis = books.Add(COleVariant(CString(fileName)));

	if (lpDis)
	{
		workBook.AttachDispatch(lpDis);

		sheets.AttachDispatch(workBook.get_Worksheets());

		openFileName = fileName;
		return true;
	}

	return false;
}

void Excel::close(bool ifSave)
{
	//如果文件已经打开，关闭文件
	if (!openFileName.IsEmpty())
	{
		//如果保存,交给用户控制,让用户自己存，如果自己SAVE，会出现莫名的等待  
		if (ifSave)
		{
			//show(true);
		}
		else
		{
			workBook.Close(COleVariant(short(FALSE)), COleVariant(openFileName), covOptional);
			books.Close();
		}

		//清空打开文件名称
		openFileName.Empty();
	}


	sheets.ReleaseDispatch();
	workSheet.ReleaseDispatch();
	currentRange.ReleaseDispatch();
	workBook.ReleaseDispatch();
	books.ReleaseDispatch();
}

void Excel::saveAsXLSFile(const CString &xlsFile)
{
	workBook.SaveAs(COleVariant(xlsFile),
		covOptional,
		covOptional,
		covOptional,
		covOptional,
		covOptional,
		0,
		covOptional,
		covOptional,
		covOptional,
		covOptional,
		covOptional);
	return;
}


int Excel::getSheetCount()
{
	return sheets.get_Count();
}

CString Excel::getSheetName(long tableID)
{
	CWorksheet sheet;
	sheet.AttachDispatch(sheets.get_Item(COleVariant((long)tableID)));
	CString name = sheet.get_Name();
	sheet.ReleaseDispatch();
	return name;
}


void Excel::preLoadSheet()
{
	CRange used_range;

	used_range = workSheet.get_UsedRange();


	VARIANT ret_ary = used_range.get_Value2();
	if (!(ret_ary.vt & VT_ARRAY))
	{
		return;
	}
	//  
	safeArray.Clear();
	safeArray.Attach(ret_ary);
}

//按照名称加载sheet表格，也可提前加载所有表格
bool Excel::loadSheet(long tableId, bool preLoaded)
{
	LPDISPATCH lpDis = nullptr;
	currentRange.ReleaseDispatch();
	currentRange.ReleaseDispatch();
	lpDis = sheets.get_Item(COleVariant((long)tableId));
	if (lpDis)
	{
		workSheet.AttachDispatch(lpDis, true);
		currentRange.AttachDispatch(workSheet.get_Cells(), true);
	}
	else
	{
		return false;
	}

	isLoad = false;
	//如果进行预先加载  
	if (preLoaded)
	{
		preLoadSheet();
		isLoad = true;
	}

	return true;
}


bool Excel::loadSheet(CString sheet, bool preLoaded)
{
	LPDISPATCH lpDis = nullptr;
	currentRange.ReleaseDispatch();
	currentRange.ReleaseDispatch();

	lpDis = sheets.get_Item(COleVariant(sheet));
	if (lpDis)
	{
		workSheet.AttachDispatch(lpDis, true);
		currentRange.AttachDispatch(workSheet.get_Cells(), true);
	}
	else
	{
		return false;
	}

	isLoad = false;
	//如果进行预先加载  
	if (preLoaded)
	{
		preLoadSheet();
		isLoad = true;
	}

	return true;
}


int Excel::getColumnCount()
{
	CRange range;
	CRange usedRange;

	usedRange.AttachDispatch(workSheet.get_UsedRange(), true);
	range.AttachDispatch(usedRange.get_Columns(), true);
	int count = range.get_Count();

	usedRange.ReleaseDispatch();
	range.ReleaseDispatch();

	return count;
}

int Excel::getRowCount()
{
	CRange range;
	CRange usedRange;

	usedRange.AttachDispatch(workSheet.get_UsedRange(), true);
	range.AttachDispatch(usedRange.get_Rows(), true);

	int count = range.get_Count();

	usedRange.ReleaseDispatch();
	range.ReleaseDispatch();

	return count;
}

bool Excel::isCellString(long iRow, long iColumn)
{
	CRange range;
	range.AttachDispatch(currentRange.get_Item(COleVariant((long)iRow), COleVariant((long)iColumn)).pdispVal, true);
	COleVariant vResult = range.get_Value2();
	//VT_BSTR标示字符串  
	if (vResult.vt == VT_BSTR)
	{
		return true;
	}
	return false;
}


bool Excel::isCellInt(long iRow, long iColumn)
{

	CRange range;
	range.AttachDispatch(currentRange.get_Item(COleVariant((long)iRow), COleVariant((long)iColumn)).pdispVal, true);
	COleVariant vResult = range.get_Value2();
	//VT_BSTR标示字符串  
	if (vResult.vt == VT_INT || vResult.vt == VT_R8)
	{
		return true;
	}
	return false;
}

CString Excel::getCellString(long iRow, long iColumn)
{
	COleVariant vResult;
	CString str;
	//字符串  
	if (isLoad == false)
	{
		CRange range;
		range.AttachDispatch(currentRange.get_Item(COleVariant((long)iRow), COleVariant((long)iColumn)).pdispVal, true);
		vResult = range.get_Value2();
		range.ReleaseDispatch();
	}
	//如果数据依据预先加载了  
	else
	{
		long read_address[2];
		VARIANT val;
		read_address[0] = iRow;
		read_address[1] = iColumn;
		safeArray.GetElement(read_address, &val);
		vResult = val;
	}

	if (vResult.vt == VT_BSTR)
	{
		str = vResult.bstrVal;
	}
	//整数  
	else if (vResult.vt == VT_INT)
	{
		str.Format(_T("%d"), vResult.pintVal);
	}
	//8字节的数字   
	else if (vResult.vt == VT_R8)
	{
		str.Format(_T("%0.0f"), vResult.dblVal);
	}
	//时间格式  
	else if (vResult.vt == VT_DATE)
	{
		SYSTEMTIME st;
		VariantTimeToSystemTime(vResult.date, &st);
		CTime tm(st);
		str = tm.Format(_T("%Y-%m-%d"));

	}
	//单元格空的  
	else if (vResult.vt == VT_EMPTY)
	{
		str = "";
	}

	return str;
}

double Excel::getCellDouble(long iRow, long iColumn)
{
	double rtn_value = 0;
	COleVariant vresult;
	//字符串  
	if (isLoad == false)
	{
		CRange range;
		range.AttachDispatch(currentRange.get_Item(COleVariant((long)iRow), COleVariant((long)iColumn)).pdispVal, true);
		vresult = range.get_Value2();
		range.ReleaseDispatch();
	}
	//如果数据依据预先加载了  
	else
	{
		long read_address[2];
		VARIANT val;
		read_address[0] = iRow;
		read_address[1] = iColumn;
		safeArray.GetElement(read_address, &val);
		vresult = val;
	}

	if (vresult.vt == VT_R8)
	{
		rtn_value = vresult.dblVal;
	}

	return rtn_value;
}

int Excel::getCellInt(long iRow, long iColumn)
{
	int num;
	COleVariant vresult;

	if (isLoad == FALSE)
	{
		CRange range;
		range.AttachDispatch(currentRange.get_Item(COleVariant((long)iRow), COleVariant((long)iColumn)).pdispVal, true);
		vresult = range.get_Value2();
		range.ReleaseDispatch();
	}
	else
	{
		long read_address[2];
		VARIANT val;
		read_address[0] = iRow;
		read_address[1] = iColumn;
		safeArray.GetElement(read_address, &val);
		vresult = val;
	}
	//  
	num = static_cast(vresult.dblVal);

	return num;
}

void Excel::setCellString(long iRow, long iColumn, CString newString)
{
	COleVariant new_value(newString);
	CRange start_range = workSheet.get_Range(COleVariant(_T("A1")), covOptional);
	CRange write_range = start_range.get_Offset(COleVariant((long)iRow - 1), COleVariant((long)iColumn - 1));
	write_range.put_Value2(new_value);
	start_range.ReleaseDispatch();
	write_range.ReleaseDispatch();
}

void Excel::setCellInt(long iRow, long iColumn, int newInt)
{
	COleVariant new_value((long)newInt);
	CRange start_range = workSheet.get_Range(COleVariant(_T("A1")), covOptional);
	CRange write_range = start_range.get_Offset(COleVariant((long)iRow - 1), COleVariant((long)iColumn - 1));
	write_range.put_Value2(new_value);
	start_range.ReleaseDispatch();
	write_range.ReleaseDispatch();
}


void Excel::show(bool bShow)
{
	application.put_Visible(bShow);
	application.put_UserControl(bShow);
}

CString Excel::getOpenFileName()
{
	return openFileName;
}

CString Excel::getOpenSheelName()
{
	return workSheet.get_Name();
}

char* Excel::getColumnName(long iColumn)
{
	static char column_name[64];
	size_t str_len = 0;

	while (iColumn > 0)
	{
		int num_data = iColumn % 26;
		iColumn /= 26;
		if (num_data == 0)
		{
			num_data = 26;
			iColumn--;
		}
		column_name[str_len] = (char)((num_data - 1) + 'A');
		str_len++;
	}
	column_name[str_len] = '\0';
	//反转  
	_strrev(column_name);

	return column_name;
}

//使用excel类
	Excel excl;
	bool bInit = excl.initExcel();
	char path[MAX_PATH];
	GetCurrentDirectoryA(MAX_PATH, path);//获取当前工作目录
	strcat_s(path, "\\data.xlsx");//设置要打开文件的完整路径


	bool bRet = excl.open(path);//打开excel文件

	CString strSheetName = excl.getSheetName(1);//获取sheet名
	bool bLoad = excl.loadSheet(strSheetName);//装载sheet
	int nRow = excl.getRowCount();//获取sheet中行数
	int nCol = excl.getColumnCount();//获取sheet中列数


	CString cell;
	for (int i = 1; i <= nRow; ++i)
	{
		for (int j = 1; j <= nCol; ++j)
		{
			cell = excl.getCellString(i, j);
		}
	}