Use SR_CONF_DEVICE_OPTIONS to decide if LIMIT_SAMPLES is supported.

diff --git a/pv/toolbars/samplingbar.cpp b/pv/toolbars/samplingbar.cpp
index 987719d8c2f45cfa37db50a03b95c7e34bcbf70d..15eaf3b488d481f5fd5b1a6e599a692332093518 100644 (file)
--- a/pv/toolbars/samplingbar.cpp
+++ b/pv/toolbars/samplingbar.cpp
@@ -204,28 +204,43 @@ void SamplingBar::update_sample_count_selector()
 {
        sr_dev_inst *const sdi = get_selected_device();
        GVariant *gvar;
-       uint64_t samplecount;
+       uint64_t samplecount = 0;
 
        assert(sdi);
 
-       if (sr_config_get(sdi->driver, sdi, NULL,
-               SR_CONF_LIMIT_SAMPLES, &gvar) != SR_OK)
+       _sample_count_supported = false;
+
+       if (sr_config_list(sdi->driver, sdi, NULL,
+               SR_CONF_DEVICE_OPTIONS, &gvar) == SR_OK)
        {
-               _sample_count_supported = false;
-               _sample_count.show_none();
+               gsize num_opts;
+               const int *const options = (const int32_t *)g_variant_get_fixed_array(
+               gvar, &num_opts, sizeof(int32_t));
+               for (unsigned int i = 0; i < num_opts; i++)
+               {
+                       if (options[i] == SR_CONF_LIMIT_SAMPLES)
+                       {
+                               _sample_count_supported = true;
+                               break;
+                       }
+               }
        }
-       else
-       {
-               _sample_count_supported = true;
+
+       if (_sample_count_supported)
                _sample_count.show_min_max_step(0, UINT64_MAX, 1);
+       else
+               _sample_count.show_none();
 
+       if (sr_config_get(sdi->driver, sdi, NULL,
+               SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK)
+       {
                samplecount = g_variant_get_uint64(gvar);
                g_variant_unref(gvar);
-
-               _updating_sample_count = true;
-               _sample_count.set_value(samplecount);
-               _updating_sample_count = false;
        }
+
+       _updating_sample_count = true;
+       _sample_count.set_value(samplecount);
+       _updating_sample_count = false;
 }
 
 void SamplingBar::commit_sample_count()