Question

怎么用C++获取Excel内有效数据的行数

编译器用的vs2008 Excel用的2010
我要把Excel的数据批量导入到我做的MFC程序当中，但是数据量比较大需要用循环语句
在循环过程中不知道具体Excel里有几行数据 因此不知道需要循环多少次不知道准备多少个容器来容纳数据
求告知获取Excel内有效数据的行数的方法

Answer 1

方法如下：

代码供参考：

/************* 1--- ADO *************/
//.h
//---------------------------------------------------------------------------

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ADODB.hpp>
#include <DB.hpp>
#include <DBGrids.hpp>
#include <Dialogs.hpp>
#include <Grids.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TButton *btnOpen;
TButton *btnExit;
TOpenDialog *OpenDialog1;
TButton *btnEx;
TDataSource *DataSource1;
TADOConnection *ADOConnection1;
TADOQuery *ADOQuery1;
TDBGrid *DBGrid1;
void __fastcall btnExClick(TObject *Sender);
void __fastcall btnOpenClick(TObject *Sender);
void __fastcall btnExitClick(TObject *Sender);
private: // User declarations
public: // User declarations
__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

//.cpp
//---------------------------------------------------------------------------

#include <vcl.h>
#include <stdio.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
DBGrid1->DataSource = DataSource1;
DataSource1->DataSet = ADOQuery1;
ADOQuery1->Connection = ADOConnection1;
ADOConnection1->LoginPrompt = false;
}
//---------------------------------------------------------------------------

void __fastcall TForm1::btnExClick(TObject *Sender)
{
if(ADOQuery1->Active && ADOQuery1->RecordCount>0 )
{
int col;
AnsiString s;
FILE *fp;
fp = fopen("c:\\out.txt","w+t");
if(fp==NULL)
{
Application->MessageBox("导出文件建立失败","提示");
return ;
}
col = ADOQuery1->Fields->Count;
ADOQuery1->First();
while(!ADOQuery1->Eof)
{
s = "";
for(int i=0;i<col;i++)
s += ADOQuery1->Fields->Fields[i]->AsString +"\t";

fprintf(fp,"%s\n",s.c_str());
ADOQuery1->Next();
}
fclose(fp);
}
else
{
Application->MessageBox("没有需要导出的记录，请重新打开XLS文件","提示");
}
}
//---------------------------------------------------------------------------

void __fastcall TForm1::btnOpenClick(TObject *Sender)
{
AnsiString sFile="";
AnsiString sCon;
if(OpenDialog1->Execute())
{
sFile = OpenDialog1->FileName;
/*
sCon = AnsiString("Driver={Microsoft Excel Driver (*.xls)};DBQ=")
+ sFile +"; ";
*/
sCon = AnsiString("Provider=MSDASQL.1;Persist Security Info=False;Extended Properties='DSN=Excel Files;DBQ=")
+ sFile +"'; ";

}

try
{
if(sFile!="")
{
ADOConnection1->Connected = False;
ADOConnection1->ConnectionString = sCon;
ADOConnection1->Connected = True;
}
}
catch(...)
{
Application->MessageBox("连接XLS失败","提示");
return ;
}

if(ADOConnection1->Connected)
{
AnsiString sSQL = "Select * from [Sheet1$]";
ADOQuery1->SQL->Text = sSQL;
ADOQuery1->Active = True;
}

}
//---------------------------------------------------------------------------
void __fastcall TForm1::btnExitClick(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------

/************* 2-- OLE *************/
C++ Builder把Excel自动化对象的功能包装在下面的四个Ole Object Class函数中,应用人员可以很方便地进行调用。
设置对象属性:void OlePropertySet(属性名,参数……);
获得对象属性:Variant OlePropertyGet(属性名,参数……);
调用对象方法:1) Variant OleFunction(函数名,参数……);
2) void OleProcedure(过程名,参数……);