c#读写Ini文件

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace FileOperation{ /// <summary> /// 读写INI类 /// </summary> public class IniReaderWriter { // 声明INI文件的写操作函数 WritePrivateProfileString() [System.Runtime.InteropServices.DllImport("kernel32")] private static extern long WritePrivateProfileString(string section, string key, string val, string filePath); // 声明INI文件的读操作函数 GetPrivateProfileString() [System.Runtime.InteropServices.DllImport("kernel32")] private static extern int GetPrivateProfileString(string section, string key, string def, System.Text.StringBuilder retVal, int size, string filePath); [DllImport("kernel32", EntryPoint = "WritePrivateProfileSection")] private static extern void WriteSection(string paramSection, string paramText, string paramPath); private string _path = string.Empty; public IniReaderWriter(string path) { this._path = path; } /// <summary> /// 写值到ini文件 /// </summary> /// <param name="section">配置节</param> /// <param name="key">键名</param> /// <param name="value">键值</param> public void WriteValue(string section, string key, string value) { WritePrivateProfileString(section, key, value, _path); } /// <summary> /// 从ini文件读取值 /// </summary> /// <param name="section">配置节</param> /// <param name="key">键名</param> /// <returns>键值</returns> public string ReadValue(string section, string key) { // 读取字节数 System.Text.StringBuilder temp = new System.Text.StringBuilder(255); GetPrivateProfileString(section, key, "", temp, 255, _path); return temp.ToString(); } /// <summary> /// 只添加一个节点 /// </summary> /// <param name="paramSection">要添加的节点</param> /// <param name="parmaText">要添加的内容</param> public void WriteSection(string paramSection,string parmaText) { WriteSection(paramSection,parmaText,_path); } /// <summary> /// 只添加一个节点，无任何键值 /// </summary> /// <param name="paramSection">要添加的节点</param> public void WriteSection(string paramSection) { WriteSection(paramSection, "", _path); } /// <summary> /// 删除该节 /// </summary> /// <param name="paramSection"></param> public void DeleteSection(string paramSection) { WritePrivateProfileString(paramSection, null, "value",_path); } /// <summary> /// 删除节点中一个键 /// </summary> /// <param name="paramSection"></param> public void DeleteKey(string paramSection,string paramKey) { WritePrivateProfileString(paramSection, paramKey, null, _path); } }}

 

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。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。

 

客户端调用：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;namespace FileOperation{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //写 IniReaderWriter ini = new IniReaderWriter("D:/test.ini"); ini.WriteValue("Node", "key1", "value1"); ini.WriteValue("Node", "key2", "value2"); // 读 string str = ini.ReadValue("Node", "key1"); MessageBox.Show(str); } }}

API说明：

BOOL WritePrivateProfileString(

    LPCTSTR lpAppName, // 节名

    LPCTSTR lpKeyName, // 键名

    LPCTSTR lpString, // 添加的字符串

    LPCTSTR lpFileName  // Ini文件名

   );

BOOL WritePrivateProfileStruct(

    LPCTSTR lpszSection, // pointer to section name

    LPCTSTR lpszKey, // pointer to key name

    LPVOID lpStruct, // 要写入的数据缓冲区

    UINT uSizeStruct, // 缓冲区的大小

    LPCTSTR szFile // pointer to initialization filename

   );

BOOL WritePrivateProfileSection(

    LPCTSTR lpAppName, // pointer to string with section name

    LPCTSTR lpString, // 写入的字符串

    LPCTSTR lpFileName  // pointer to string with filename

   );

用API读INI文件的函数有

DWORD GetPrivateProfileString(

    LPCTSTR lpAppName, // points to section name

    LPCTSTR lpKeyName, // points to key name

    LPCTSTR lpDefault, // 默认字符串 ，如果没有则返回该值

    LPTSTR lpReturnedString, // 返回的字符串

    DWORD nSize, // 返回字符串的大小

    LPCTSTR lpFileName  // points to initialization filename

   );

DWORD GetPrivateProfileSection(

    LPCTSTR lpAppName, // address of section name

    LPTSTR lpReturnedString, // address of return buffer

    DWORD nSize, // size of return buffer

    LPCTSTR lpFileName  // address of initialization filename  

   );

UINT GetPrivateProfileInt(

    LPCTSTR lpAppName, // address of section name

    LPCTSTR lpKeyName, // address of key name

    INT nDefault, // return value if key name is not found

    LPCTSTR lpFileName  // address of initialization filename

   ); 

BOOL GetPrivateProfileStruct(

    LPCTSTR lpszSection, // address of section name

    LPCTSTR lpszKey, // address of key name

    LPVOID lpStruct, // address of return buffer

    UINT uSizeStruct, // size of return buffer

    LPCTSTR szFile // address of initialization filename

   );

DWORD GetPrivateProfileSectionNames(

    LPTSTR lpszReturnBuffer, // address of return buffer

    DWORD nSize, // size of return buffer

    LPCTSTR lpFileName // address of initialization filename

   );

当然还有如WriteProfileString,WriteProfileSection,WriteProfileSturct, GetProfileString,GetProfileStruct,GetProfileSectionNames,GetProfileInt,GetProfileSection但这些只对Win.ini有效

下面我们来学习它们的用法

WritePrivateProfileString函数是向ini文件中写入字符串，如

WritePrivateProfileString(Pchar('类型'),Pchar('API'),Pchar('API 真好!'),Pchar('c:/example.ini'));

如果第二个参数是nil，那么该操作将删除该节

如果第三个参数为nil，那么该操作将删除该节中的所有键

如果在指定的文件中没有路径，那么它将在系统的目录寻找文件，如果不存在则建立