一、TRegIniFile方法：(特点：操作简单，可用于Win95/98 Window NT) 
首先，在源文件(cpp)中加入 
#include <vcl\registry.hpp> //for C++ Builder 3.0 

__fastcall TForm1::TForm1(TComponent* Owner): TForm(Owner) 
{ // 当Form1打开时，从注册表读入Left值 
TRegIniFile *pIni = new TRegIniFile("SOFTWARE\\MyName\\MyProg"); 
Left = pIni->ReadInteger("Config","Left",200); 
delete pIni; 
} 

void __fastcall TForm1::FormClose(TObject *Sender,TCloseAction &Action) 

{ // 当Form1关闭时，往注册表存放Left值 

TRegIniFile *pIni = new TRegIniFile("SOFTWARE\\MyName\\MyProg"); 

pIni->WriteInteger("Config","Left",Left); 
delete pIni; 
} 

注：在缺省状态下，信息存放HKEY_CURRENT_USER根目录下。实际上，它代替了Windows 3.1中的Ini文件.若存放在其它根目录下，可设置Registry->RootKey,例： 

Registry->RootKey ＝ HKEY_LOCAL_MACHINE; 

除了可以存放整型值，还可以存放字符串值和布尔值。 

二、如何操作注册表 

#include <Registry.hpp> 

TRegIniFile *R=new TRegIniFile("SOFTWARE\\ahao''s Softwares\\Wenku\\Config"); 

//读： 
Edit2->Text=R->ReadString("SMTP","Host",""); 
Edit3->Text=IntToStr(R->ReadInteger("SMTP","Port",25)); 
Edit4->Text=R->ReadString("SMTP","UserID",""); 

//写： 
R->WriteString("SMTP","Host",Edit2->Text); 
R->WriteInteger("SMTP","Port",StrToInt(Edit3->Text)); 
R->WriteString("SMTP","UserID",Edit4->Text); 

别忘了 R->Free();