How can I load a program icon in C#

Question

I have a path of some program (for example explorer), how can I get program icon, convert it to png/jpeg and then display in PictureBox?

I have something like this:

Answer 1

The code is surprisingly simple if you know where to look. Start with the Icon class, since that's fundamentally what you're after here.

If you browse its methods, you'll come across a very interesting looking ExtractAssociatedIcon. That accepts a single string parameter that specifies the path to a file containing an icon, such as an executable file.

So that gives you an Icon object, now you just need to display it in a PictureBox. You don't have to convert it to a PNG or JPEG, a bitmap works fine. And there's a built-in member function for that: ToBitmap.

Assigning the new bitmap to the PictureBox.Image property is all you need to do to display it.

Answer 2

This question might be old but here's my answer. Here's a full code snippet I used in extracting full 256 x 256 icons from any exe file.

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

namespace IconUtils
{
    internal static class ExtractIcon
    {
       [UnmanagedFunctionPointer(CallingConvention.Winapi, SetLastError = true, CharSet = CharSet.Unicode)]
       [SuppressUnmanagedCodeSecurity]
        internal delegate bool ENUMRESNAMEPROC(IntPtr hModule, IntPtr lpszType, IntPtr lpszName, IntPtr lParam);
       [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
       public static extern IntPtr LoadLibraryEx(string lpFileName, IntPtr hFile, uint dwFlags);

       [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
       public static extern IntPtr FindResource(IntPtr hModule, IntPtr lpName, IntPtr lpType);

       [DllImport("kernel32.dll", SetLastError = true)]
       public static extern IntPtr LoadResource(IntPtr hModule, IntPtr hResInfo);

       [DllImport("kernel32.dll", SetLastError = true)]
       public static extern IntPtr LockResource(IntPtr hResData);

       [DllImport("kernel32.dll", SetLastError = true)]
       public static extern uint SizeofResource(IntPtr hModule, IntPtr hResInfo);

       [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
       [SuppressUnmanagedCodeSecurity]
       public static extern bool EnumResourceNames(IntPtr hModule, IntPtr lpszType, ENUMRESNAMEPROC lpEnumFunc, IntPtr lParam);


       private const uint LOAD_LIBRARY_AS_DATAFILE = 0x00000002;
       private readonly static IntPtr RT_ICON = (IntPtr)3;
       private readonly static IntPtr RT_GROUP_ICON = (IntPtr)14;

       public static Icon ExtractIconFromExecutable(string path)
       {
           IntPtr hModule = LoadLibraryEx(path, IntPtr.Zero, LOAD_LIBRARY_AS_DATAFILE);
           var tmpData = new List<byte[]>();

           ENUMRESNAMEPROC callback = (h, t, name, l) =>
           {
               var dir = GetDataFromResource(hModule, RT_GROUP_ICON, name);

               // Calculate the size of an entire .icon file.

               int count = BitConverter.ToUInt16(dir, 4);  // GRPICONDIR.idCount
               int len = 6 + 16 * count;                   // sizeof(ICONDIR) + sizeof(ICONDIRENTRY) * count
               for (int i = 0; i < count; ++i)
                   len += BitConverter.ToInt32(dir, 6 + 14 * i + 8);   // GRPICONDIRENTRY.dwBytesInRes

               using (var dst = new BinaryWriter(new MemoryStream(len)))
               {
                   // Copy GRPICONDIR to ICONDIR.

                   dst.Write(dir, 0, 6);

                   int picOffset = 6 + 16 * count; // sizeof(ICONDIR) + sizeof(ICONDIRENTRY) * count

                   for (int i = 0; i < count; ++i)
                   {
                       // Load the picture.

                       ushort id = BitConverter.ToUInt16(dir, 6 + 14 * i + 12);    // GRPICONDIRENTRY.nID
                       var pic = GetDataFromResource(hModule, RT_ICON, (IntPtr)id);

                       // Copy GRPICONDIRENTRY to ICONDIRENTRY.

                       dst.Seek(6 + 16 * i, 0);

                       dst.Write(dir, 6 + 14 * i, 8);  // First 8bytes are identical.
                       dst.Write(pic.Length);          // ICONDIRENTRY.dwBytesInRes
                       dst.Write(picOffset);           // ICONDIRENTRY.dwImageOffset

                       // Copy a picture.

                       dst.Seek(picOffset, 0);
                       dst.Write(pic, 0, pic.Length);

                       picOffset += pic.Length;
                   }

                   tmpData.Add(((MemoryStream)dst.BaseStream).ToArray());
               }
               return true;
           };
           EnumResourceNames(hModule, RT_GROUP_ICON, callback, IntPtr.Zero);
           byte[][] iconData = tmpData.ToArray();
           using (var ms = new MemoryStream(iconData[0]))
           {
               return new Icon(ms);
           }
       }
       private static byte[] GetDataFromResource(IntPtr hModule, IntPtr type, IntPtr name)
       {
           // Load the binary data from the specified resource.

           IntPtr hResInfo = FindResource(hModule, name, type);

           IntPtr hResData = LoadResource(hModule, hResInfo);

           IntPtr pResData = LockResource(hResData);

           uint size = SizeofResource(hModule, hResInfo);

           byte[] buf = new byte[size];
           Marshal.Copy(pResData, buf, 0, buf.Length);

           return buf;
       }
   }
}

Usage:

Icon ExeIcon = IconUtils.ExtractIcon.ExtractIconFromExecutable(@"C:\Windows\explorer.exe");

Source: https://www.codeproject.com/Articles/26824/Extract-icons-from-EXE-or-DLL-files