C#读取EXE文件图标及读取指定文件类型图标

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32;

namespace CExplorer
{
    public static class GetSystemIcon
    {
        /// <summary>
        /// 依据文件名读取图标，若指定文件不存在，则返回空值。  
        /// </summary>
        /// <param name="fileName">文件路径</param>
        /// <param name="isLarge">是否返回大图标</param>
        /// <returns></returns>
        public static Icon GetIconByFileName(string fileName, bool isLarge = true)
        {
            int[] phiconLarge = new int[1];
            int[] phiconSmall = new int[1];
            //文件名 图标索引 
            Win32.ExtractIconEx(fileName, 0,  phiconLarge,  phiconSmall, 1);
            IntPtr IconHnd = new IntPtr(isLarge ? phiconLarge[0] : phiconSmall[0]);
            return Icon.FromHandle(IconHnd);
        }

        /// <summary>  
        /// 根据文件扩展名（如:.*），返回与之关联的图标。
        /// 若不以"."开头则返回文件夹的图标。  
        /// </summary>  
        /// <param name="fileType">文件扩展名</param>  
        /// <param name="isLarge">是否返回大图标</param>  
        /// <returns></returns>  
        public static Icon GetIconByFileType(string fileType, bool isLarge)
        {
            if (fileType == null || fileType.Equals(string.Empty)) return null;

            RegistryKey regVersion = null;
            string regFileType = null;
            string regIconString = null;
            string systemDirectory = Environment.SystemDirectory + "\\";

            if (fileType[0] == '.')
            {
                //读系统注册表中文件类型信息  
                regVersion = Registry.ClassesRoot.OpenSubKey(fileType, true);
                if (regVersion != null)
                {
                    regFileType = regVersion.GetValue("") as string;
                    regVersion.Close();
                    regVersion = Registry.ClassesRoot.OpenSubKey(regFileType + @"\DefaultIcon", true);
                    if (regVersion != null)
                    {
                        regIconString = regVersion.GetValue("") as string;
                        regVersion.Close();
                    }
                }
                if (regIconString == null)
                {
                    //没有读取到文件类型注册信息，指定为未知文件类型的图标  
                    regIconString = systemDirectory + "shell32.dll,0";
                }
            }
            else
            {
                //直接指定为文件夹图标  
                regIconString = systemDirectory + "shell32.dll,3";
            }
            string[] fileIcon = regIconString.Split(new char[] { ',' });
            if (fileIcon.Length != 2)
            {
                //系统注册表中注册的标图不能直接提取，则返回可执行文件的通用图标  
                fileIcon = new string[] { systemDirectory + "shell32.dll", "2" };
            }
            Icon resultIcon = null;
            try
            {
                //调用API方法读取图标  
                int[] phiconLarge = new int[1];
                int[] phiconSmall = new int[1];
                uint count = Win32.ExtractIconEx(fileIcon[0], Int32.Parse(fileIcon[1]), phiconLarge, phiconSmall, 1);
                IntPtr IconHnd = new IntPtr(isLarge ? phiconLarge[0] : phiconSmall[0]);
                resultIcon = Icon.FromHandle(IconHnd);
            }
            catch { }
            return resultIcon;
        }
    }

    /// <summary>  
    /// 定义调用的API方法  
    /// </summary>  
    class Win32
    {
        [DllImport("shell32.dll")]
        public static extern uint ExtractIconEx(string lpszFile, int nIconIndex, int[] phiconLarge, int[] phiconSmall, uint nIcons);

    }
}

 

示例下载：exe、dll文件图标提取器