虽然微软早已经建议在WINDOWS中用注册表代替INI文件,但是在实际应用中,INI文件仍然有用武之地,尤其现在绿色软件的流行,越来越多的程序将自己的一些配置信息保存到了INI文件中。
INI文件是文本文件,由若干节(section)组成,在每个带括号的标题下面,是若干个关键词(key)及其对应的值(Value):
[Section]
Key=Value
VC中提供了API函数进行INI文件的读写操作,但是微软推出的C#编程语言中却没有相应的方法,下面我介绍一个读写INI文件的C#类并利用该类保存窗体的坐标,当程序再次运行的时候,窗体将显示在上次退出时的位置。
INIFILE类:
using System;
using System.IO;
using System.Runtime.InteropServices;
因为我们需要调用API函数,所以必须创建System.Runtime.InteropServices命名空间以提供可用于访问 .NET 中的 COM 对象和本机 API 的类的集合。
- using System.Text;
-
- namespace Ini
- {
- public class IniFile
- {
- public string path;
-
- [DllImport("kernel32")]
- private static extern long WritePrivateProfileString(string section,string key,
- string val,string filePath);
-
- [DllImport("kernel32")]
- private static extern int GetPrivateProfileString(string section,string key,string def,
- StringBuilder retVal,int size,string filePath);
-
-
- public IniFile(string INIPath)
- {
- path = INIPath;
- }
-
-
- publicvoid IniWriteValue(string Section,string Key,string Value)
- {
- WritePrivateProfileString(Section,Key,Value,this.path);
- }
-
-
- publicstring IniReadValue(string Section,string Key)
- {
- StringBuilder temp = new StringBuilder(255);
- int i = GetPrivateProfileString(Section,Key,"",temp,255,this.path);
- return temp.ToString();
- }
-
-
- }
- }
调用INIFILE类:
新建一个标准的C# WINDOWS应用程序项目,在窗体中分别增加命名为sect、key、val的三个文本框。
增加如下代码:
using Ini; //创建命名空间
//当窗体关闭时保存窗体坐标
- privatevoid Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
- {
- IniFile ini = new IniFile("C://test.ini");
- ini.IniWriteValue("LOC" ,"x" ,this.Location.X.ToString());
- ini.IniWriteValue("LOC " ,"y" ,this.Location.Y.ToString());
-
-
- }
//当窗体启动时,读取INI文件的值并赋值给窗体
- privatevoid Form1_Load(object sender, System.EventArgs e)
- {
- IniFile ini = new IniFile("C://test.ini");
- Point p=new Point();
-
-
- if ((ini.IniReadValue ("LOC" ,"x" )!="" ) && (ini.IniReadValue ("LOC" ,"y" )!=""))
- {
- p.X=int.Parse (ini.IniReadValue ("LOC" ,"x" ));
- p.Y =int.Parse (ini.IniReadValue ("LOC" ,"y" ));
-
-
- this.Location =p;
- }
- }
==============================================
其他方法:
DllImport("kernel32.dll")]
public extern static int GetPrivateProfileString(string segName, string keyName, string sDefault, StringBuilder buffer, int nSize, string fileName);
public extern static int GetPrivateProfileStringA(string segName, string keyName, string sDefault, byte[] buffer, int iLen, string fileName); // ANSI版本
[DllImport("kernel32.dll")]
public extern static int GetPrivateProfileSection(string segName, StringBuilder buffer, int nSize, string fileName);
[DllImport("kernel32.dll")]
public extern static int WritePrivateProfileSection(string segName, string sValue, string fileName);
[DllImport("kernel32.dll")]
public extern static int WritePrivateProfileString(string segName, string keyName, string sValue, string fileName);
[DllImport("kernel32.dll")]
public extern static int GetPrivateProfileSectionNamesA(byte[] buffer, int iLen, string fileName);
- public ArrayList ReadSections()
- {
- byte[] buffer = new byte[65535];
- int rel = 0;
- int iCnt, iPos;
- ArrayList arrayList = new ArrayList();
- string tmp;
- if (rel > 0)
- {
- iCnt = 0; iPos = 0;
- for (iCnt = 0; iCnt < rel; iCnt++)
- {
- if (buffer[iCnt] == 0x00)
- {
- tmp = System.Text.ASCIIEncoding.Default.GetString(buffer, iPos, iCnt - iPos).Trim();
- iPos = iCnt + 1;
- if (tmp != "")
- arrayList.Add(tmp);
- }
- }
- }
- return arrayList;
- }
-
-
- public ArrayList ReadKeys(string sectionName)
- {
-
- byte[] buffer = new byte[5120];
- int rel = 0;
-
- int iCnt, iPos;
- ArrayList arrayList = new ArrayList();
- string tmp;
- if (rel > 0)
- {
- iCnt = 0; iPos = 0;
- for (iCnt = 0; iCnt < rel; iCnt++)
- {
- if (buffer[iCnt] == 0x00)
- {
- tmp = System.Text.ASCIIEncoding.Default.GetString(buffer, iPos, iCnt - iPos).Trim();
- iPos = iCnt + 1;
- if (tmp != "")
- arrayList.Add(tmp);
- }
- }
- }
- return arrayList;
- }