Uses Windows COM to create an ISO

create_iso.cpp

//
// adapted from : https://gist.github.com/daaximus/a48b0a991b31e8841b68dbbc480a0a5a
//
#define UNICODE

#include <windows.h>
#include <imapi2fs.h>
#include <shlwapi.h>
#include <objbase.h>
#include <oleauto.h>

#pragma comment(lib, "shlwapi")
#pragma comment(lib, "ole32")
#pragma comment(lib, "oleaut32")

void create_iso( PWCHAR src, PWCHAR iso_path )
{
    HRESULT hr;
    IFileSystemImage* fsimg;
    IFsiDirectoryItem* fsdir;
    IFileSystemImageResult* fsresult;
    IStream* img;
    IStream* filestream;

    hr = CoCreateInstance( __uuidof( MsftFileSystemImage ),
                           NULL,
                           CLSCTX_INPROC_SERVER,
                           __uuidof( IFileSystemImage ),
                           ( LPVOID* ) &fsimg );
    if ( SUCCEEDED( hr ) )
    {
        fsimg->get_Root( &fsdir );
        BSTR src_bstr = SysAllocString(src);

        fsdir->AddTree( src_bstr, VARIANT_TRUE );
        SysFreeString(src_bstr);
        
        hr = fsimg->CreateResultImage( &fsresult );
        if ( SUCCEEDED( hr ) )
        {
            fsresult->get_ImageStream( &img );
            if ( SUCCEEDED( hr ) )
            {
                STATSTG statstg;
                ULARGE_INTEGER rd;
                ULARGE_INTEGER wr;
                BSTR iso_bstr = SysAllocString(iso_path);
                
                SHCreateStreamOnFileEx( iso_bstr,
                                        STGM_READWRITE,
                                        FILE_ATTRIBUTE_NORMAL,
                                        TRUE,
                                        NULL,
                                        &filestream );
                SysFreeString(iso_bstr);
                
                img->Stat( &statstg, STATFLAG_DEFAULT );
                img->CopyTo( filestream, statstg.cbSize, &rd, &wr );
                filestream->Release();
                img->Release();
            }

            fsresult->Release();
        }

        fsimg->Release();
    }
}

int
main(void) {
    CoInitialize(NULL);
    create_iso(L"c:\\windows\\system32\\cmd.exe", L"cmd.iso");
    CoUninitialize();
}