利用Windows注册表存储信息
 

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();