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How to read excel in c++

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Release: 2020-02-19 09:30:00
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How to read excel in c++

c++如何读取excel?C++ ODBC操作excel全过程

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想要通过ODBC直接读、写Excel表格文件,首先,应确保ODBC中已安装有Excel表格文件的驱动"MICROSOFT EXCEL DRIVER (*.XLS)"。然后,可根据下面步骤进行:

1. 在StdAfx.h文件中加入:

#include <afxdb.h> 
#include <odbcinst.h>
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2. 通过ODBC直接创建Excel文件(暂定文件名:Demo.xls)

//创建并写入Excel文件
void CRWExcel::WriteToExcel()
{
CDatabase database;
CString sDriver = "MICROSOFT EXCEL DRIVER (*.XLS)"; // Excel安装驱动
CString sExcelFile = "c:\\demo.xls"; // 要建立的Excel文件
CString sSql;
TRY
{
// 创建进行存取的字符串
sSql.Format("DRIVER={%s};DSN=&#39;&#39;;FIRSTROWHASNAMES=1;READONLY=FALSE;CREATE_DB=\"%s\";DBQ=%s",sDriver, sExcelFile, sExcelFile);
// 创建数据库 (既Excel表格文件)
if( database.OpenEx(sSql,CDatabase::noOdbcDialog) )
{
// 创建表结构(姓名、年龄)
sSql = "CREATE TABLE demo (Name TEXT,Age NUMBER)";
database.ExecuteSQL(sSql);
// 插入数值
sSql = "INSERT INTO demo (Name,Age) VALUES (&#39;徐景周&#39;,26)";
database.ExecuteSQL(sSql);
sSql = "INSERT INTO demo (Name,Age) VALUES (&#39;徐志慧&#39;,22)";
database.ExecuteSQL(sSql);
sSql = "INSERT INTO demo (Name,Age) VALUES (&#39;郭徽&#39;,27)";
database.ExecuteSQL(sSql);
} 
// 关闭数据库
database.Close();
}
CATCH_ALL(e)
{
TRACE1("Excel驱动没有安装: %s",sDriver);
}
END_CATCH_ALL;
}
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3. 通过ODBC直接读取Excel文件(暂定文件名:Demo.xls)

// 读取Excel文件
void CRWExcel::ReadFromExcel() 
{
CDatabase database;
CString sSql;
CString sItem1, sItem2;
CString sDriver;
CString sDsn;
CString sFile = "Demo.xls"; // 将被读取的Excel文件名
// 检索是否安装有Excel驱动 "Microsoft Excel Driver (*.xls)" 
sDriver = GetExcelDriver();
if (sDriver.IsEmpty())
{
// 没有发现Excel驱动
AfxMessageBox("没有安装Excel驱动!");
return;
}
// 创建进行存取的字符串
sDsn.Format("ODBC;DRIVER={%s};DSN=&#39;&#39;;DBQ=%s", sDriver, sFile);
TRY
{
// 打开数据库(既Excel文件)
database.Open(NULL, false, false, sDsn);
CRecordset recset(&database);
// 设置读取的查询语句.
sSql = "SELECT Name, Age " 
"FROM demo " 
"ORDER BY Name ";
// 执行查询语句
recset.Open(CRecordset::forwardOnly, sSql, CRecordset::readOnly);
// 获取查询结果
while (!recset.IsEOF())
{
//读取Excel内部数值
recset.GetFieldValue("Name ", sItem1);
recset.GetFieldValue("Age", sItem2);
// 移到下一行
recset.MoveNext();
}
// 关闭数据库
database.Close();
}
CATCH(CDBException, e)
{
// 数据库操作产生异常时...
AfxMessageBox("数据库错误: " + e->m_strError);
}
END_CATCH;
}
// 获取ODBC中Excel驱动
CString CRWExcel::GetExcelDriver()
{
char szBuf[2001];
WORD cbBufMax = 2000;
WORD cbBufOut;
char *pszBuf = szBuf;
CString sDriver;
// 获取已安装驱动的名称(涵数在odbcinst.h里)
if (!SQLGetInstalledDrivers(szBuf, cbBufMax, &cbBufOut))
return "";
// 检索已安装的驱动是否有Excel...
do
{
if (strstr(pszBuf, "Excel") != 0)
{
//发现 !
sDriver = CString(pszBuf);
break;
}
pszBuf = strchr(pszBuf, &#39;\0&#39;) + 1;
}
while (pszBuf[1] != &#39;\0&#39;);
return sDriver;
}
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