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();