[gphoto-devel] Just-Focus sample

[maldworth <mal...@gm...>]

I'm having problems with the Just-Focus.c sample. It compiles fine, however
there's two functions. With argc=1, it does an autofocus. On my Nikon D90
this works like a charm. Then with my D90 still plugged in, I try with the
argument of 1, and it gives me the error:


manual focus 1 -> 128.000000
could not set config tree to autofocus: -1
Error: Unspecified error

But focus works in another sample (preview.c). But the one difference is, it
only works because it calls the gp_camera_capture_preview (which flips the
mirror up, and then it manually focuses).

So to test this, I modified sample-justfocus.c to have:
...
else if(argc == 2)
        {

			CameraFile *file;

			retval = gp_file_new(&file);
			if (retval != GP_OK) {
				fprintf(stderr,"gp_file_new: %d\n", retval);
				exit(1);
			}
			retval = gp_camera_capture_preview(camera, file, context);
                        gp_file_unref(file);

else if(argc == 2)
        {
//########### New Code Here
				CameraFile *file;

				retval = gp_file_new(&file);
				if (retval != GP_OK) {
					fprintf(stderr,"gp_file_new: %d\n", retval);
					exit(1);
				}
				retval = gp_camera_capture_preview(camera, file, context);
				gp_file_unref(file);
//########## End of Inserted Code
                int value = atoi(argv[1]);
                retval = camera_manual_focus(camera, value, context);
        }
...

Is there a reason that this must be called prior to being able to set the
focus? Is there a way to avoid this?

Thanks



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