How to extract from exe file the same .ico file as the one used to create this exe?

Question

I\'m trying to make some kind of SFX: make a program generating a wrapping.exe around another wrapped.exe.

Wrapping.exe embed wrapped.exe as resource and, when executed,

Answer 1

This is very easy using IconLib. The response was already in this question: Thx to @Plutonix!

With following helper function (of course, extraction icon file name will not be hardcoded):

static Stream GetIconStream_ExtractIconUsingIconLib(string fileToExecute)
{
    var multiIcon = new MultiIcon();
    multiIcon.Load(fileToExecute);

    var extractedicoFileName = @"c:\temp\icon.ico";
    multiIcon.Save(extractedicoFileName, MultiIconFormat.ICO);

    return File.OpenRead(extractedicoFileName);
}

We just have to replace:

File.OpenRead(@"wrapped.ico")

with

GetIconStream_ExtractIconUsingIconLib("wrapped.exe")

This gives us full solution:

var compilation = CSharpCompilation.Create(...);
var resourceDescription = new ResourceDescription( resourceName: "SFX.resourceName",
                                                   dataProvider: () => File.OpenRead("wrapped.exe"),
                                                   isPublic:     false);

using (var iconStream = GetIconStream_ExtractIconUsingIconLib("wrapped.exe"))
using (var peStream = File.Create("wrapping.exe"))
using (var pdbStream = File.Create("wrapping.pdb"))
using (var win32resStream = compilation.CreateDefaultWin32Resources(
                                                              versionResource:  true,
                                                              noManifest:       false,
                                                              manifestContents: null,
                                                              iconInIcoFormat:  iconStream))
{
    var emitResult = compilation.Emit( peStream:          peStream,
                                       pdbStream:         pdbStream,
                                       manifestResources: new[] { resourceDescription },
                                       win32Resources:    win32resStream,
                                       options:           new EmitOptions(subsystemVersion: SubsystemVersion.Windows7));
  return emitResult;
}

Answer 2

There is also online websites that do this job https://extracico.com/