修改exe中的Icon

 示例：SheelTool( 用于源码保护，为exe加壳） 小程序技术共享

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;namespace SheelTool
{/// 
/// 调用kernel32.dll文件中的函数，实现exe文件资源修改功能/// 
class kernel32Tool{/// 
/// 修改exe中的Icon。/// （执行后，手动修改下exe文件名，即可看到icon修改效果。系统有图标缓存，所以不修改文件名，可能无法看到icon修改效果）/// 
/// .exe文件路径/// .ico文件路径/// exe中Icon目录下（用zip压缩软件即可查看）的icon文件名如 2.ico, id为1/// 有的exe中含有1-8个icopublic static unsafe void ReplaceExeIcon(string exePath, string iconPath, int iconStartId = 2, int iconCount = 8){byte[] iconBytes = File.ReadAllBytes(iconPath);ICONDIR iconDir = ToStruct(iconBytes, 0);ICONDIRENTRY iconDirEntry = ToStruct(iconBytes, Marshal.SizeOf(typeof(ICONDIR)));int iconBytesSize = iconDirEntry.dwBytesInRes;IntPtr iconHandle = Marshal.AllocHGlobal(iconBytesSize);Marshal.Copy(iconBytes, iconDirEntry.dwImageOffset, iconHandle, iconBytesSize);IntPtr exeHandle = BeginUpdateResourceW(exePath, false);int RT_ICON = 3;        // 系统预设的ICON类型，有多种for (int i = iconStartId; i < iconStartId + iconCount; i++){bool b2 = UpdateResourceW(exeHandle, (char*)RT_ICON, (char*)i, 0, iconHandle, (uint)iconBytesSize); }EndUpdateResourceW(exeHandle, false);Marshal.FreeHGlobal(iconHandle);// icon组修改//int DIFFERENCE = 11;//int RT_GROUP_ICON = (RT_ICON + DIFFERENCE);//GRPICONDIR groupIconDir = new GRPICONDIR();//groupIconDir.idCount = iconDir.idCount;//groupIconDir.idReserved = 0;//groupIconDir.idType = 1;//groupIconDir.idEntries = ToStruct(iconBytes, Marshal.SizeOf(typeof(ICONDIR)));//groupIconDir.idEntries.nID = 0;//int ICONDIR_Size = Marshal.SizeOf(typeof(GRPICONDIR));//IntPtr iconDirHandle = Marshal.AllocHGlobal(ICONDIR_Size);//Marshal.StructureToPtr(groupIconDir, iconDirHandle, false);//bool b = UpdateResourceW(exeHandle, (char*)RT_GROUP_ICON, (char*)1, 0, iconDirHandle, (uint)ICONDIR_Size);//Marshal.FreeHGlobal(iconDirHandle);}struct ICONDIRENTRY{byte bWidth;byte bHeight;byte bColorCount;byte bReserved;short wPlanes;short wBitCount;public int dwBytesInRes;public int dwImageOffset;};struct ICONDIR{short idReserved;short idType;public short idCount;//ICONDIRENTRY idEntries;};struct GRPICONDIRENTRY{byte bWidth;byte bHeight;byte bColorCount;byte bReserved;short wPlanes;short wBitCount;int dwBytesInRes;public short nID;};struct GRPICONDIR{public short idReserved;public short idType;public short idCount;public GRPICONDIRENTRY idEntries;};[DllImport("kernel32.dll")]public static extern IntPtr BeginUpdateResourceW([In] [MarshalAs(UnmanagedType.LPWStr)] string pFileName, [MarshalAs(UnmanagedType.Bool)] bool bDeleteExistingResources);[DllImport("kernel32.dll")][return: MarshalAs(UnmanagedType.Bool)]public static extern unsafe bool UpdateResourceW([In] IntPtr hUpdate, [In]  char* lpType, [In]  char* lpName, ushort wLanguage, [In] IntPtr lpData, uint cb);[DllImport("kernel32.dll")][return: MarshalAs(UnmanagedType.Bool)]public static extern bool EndUpdateResourceW([In] IntPtr hUpdate, [MarshalAs(UnmanagedType.Bool)] bool fDiscard);public static T ToStruct(byte[] bytes, int index) where T : struct{int size = Marshal.SizeOf(typeof(T));IntPtr buffer = Marshal.AllocHGlobal(size);try{Marshal.Copy(bytes, index, buffer, size);return (T)Marshal.PtrToStructure(buffer, typeof(T));}finally{Marshal.FreeHGlobal(buffer);}}}}

备注： 设置下项目允许不安全代码

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