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调用非托管DLL

c#

IDE: vs2008 Express(sp1)

callXBFLibrary

我们需要使用API函数来读取INI文件。

建立P/Invoke应用类

vs2008 ui1

vs2008 ui2

在pinvoke.net中查找Win32 API在C#定义。 vs2008 ui

GetPrivateProfileString

读取Ini文件的API

[DllImport("kernel32.dll", CharSet=CharSet.Unicode)]
static extern uint GetPrivateProfileString(
   string lpAppName,
   string lpKeyName,
   string lpDefault,
   StringBuilder lpReturnedString,
   uint nSize,
   string lpFileName);

注意：DllImport属性来自using System.Runtime.InteropServices;

  • lpAppName
      小节名
  • lpKeyName
    键名
  • lpDefault
    缺省值
  • lpReturnedString
    返回值
  • nSize
    返回值长度
  • lpFileName
    读取文件的名称

import class

  using System.Runtime.InteropServices;

readIniFileVal

建立一个公共方法，以供程序使用。

public string readIniFileVal(string iniFileName, string section, string key)
{
    StringBuilder retStrBuilder = new StringBuilder(256);
    GetPrivateProfileString(
        section,
        key,
        "",
        retStrBuilder,
        256,
        iniFileName);
    return retStrBuilder.ToString();
}

code

Cwin32API.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace callXBFLibrary
{
    class Cwin32API
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
        private static extern uint GetPrivateProfileString(
           string lpAppName,
           string lpKeyName,
           string lpDefault,
           StringBuilder lpReturnedString,
           uint nSize,
           string lpFileName);

        private string iniFileName;


        public Cwin32API(string fileName)
        {
            this.iniFileName = fileName;
        }

        /**
         * <p> Read Ini File Value </p>
         *
         * @param name="section"
         * @param name="key"
         * @returns string
         *
         **/
        public string readIniFileVal(string section, string key)
        {
            StringBuilder retStrBuilder = new StringBuilder(256);
            GetPrivateProfileString(
                section,
                key,
                "",
                retStrBuilder,
                256,
                iniFileName);
            return retStrBuilder.ToString();
        }
    }

}