Adding camera profile correction to dng_validate.exe

Using Lightroom I know how to apply a camera profile (*.dcp file) to my *.DNG image.

I would like to do the same in an application which I'm writing, so I guess a good

starting point would be to append this functionality to the dng_validate.exe

application.

So I started to add:

    #include "dng_camera_profile.h"

Then added:

    static dng_string gDumpDCP;

And add the following to the error print:

    "-dcp <file>   Load camera profile from <file>.dcp\"\n"

Then I added the function to read the dcp from cli:

else if (option.Matches("dcp", true))

            {

                gDumpDCP.Clear();

                if (index + 1 < argc)

                {

                    gDumpDCP.Set(argv[++index]);

                }

                if (gDumpDCP.IsEmpty() || gDumpDCP.StartsWith("-"))

                {

                    fprintf(stderr, "*** Missing file name after -dcp\n");

                    return 1;

                }

                if (!gDumpDCP.EndsWith(".dcp"))

                {

                    gDumpDCP.Append(".dcp");

                }

            }

Then I load the profile from disk:

     if (gDumpTIF.NotEmpty ())

            {

                dng_camera_profile profile;

                if (gDumpDCP.NotEmpty())

                {

                    dng_file_stream inStream(gDumpDCP.Get());

                    profile.ParseExtended(inStream);

                }

                // Render final image.

                .... rest of code as it was

So how do I now use the profile data to correct the render and write the corrected image?