lc_bcb_74.txt

c++ builder 的一些txt文档

利用Windows注册表存储信息
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();