From: Joel Holdsworth <redacted>
Date: Sat, 22 Nov 2014 14:11:03 +0000 (+0000)
Subject: Check LIMIT_SAMPLES and SAMPLERATE are available to read before reading them
X-Git-Tag: pulseview-0.3.0~435
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=ed1d9d81f46c6595bea7278aa5dc9c1213c81609;p=pulseview.git

Check LIMIT_SAMPLES and SAMPLERATE are available to read before reading them

This fixes bug #487
---

diff --git a/pv/sigsession.cpp b/pv/sigsession.cpp
index fb457f6d..80830214 100644
--- a/pv/sigsession.cpp
+++ b/pv/sigsession.cpp
@@ -421,8 +421,12 @@ shared_ptr<view::Signal> SigSession::signal_from_channel(
 
 void SigSession::read_sample_rate(shared_ptr<Device> device)
 {
-	uint64_t sample_rate = VariantBase::cast_dynamic<Variant<guint64>>(
-		device->config_get(ConfigKey::SAMPLERATE)).get();
+	const auto keys = device_->config_keys(ConfigKey::DEVICE_OPTIONS);
+	const auto iter = keys.find(ConfigKey::SAMPLERATE);
+	const uint64_t sample_rate = (iter != keys.end() &&
+		(*iter).second.find(sigrok::GET) != (*iter).second.end()) ?
+		VariantBase::cast_dynamic<Variant<guint64>>(
+			device->config_get(ConfigKey::SAMPLERATE)).get() : 0;
 
 	// Set the sample rate of all data
 	const set< shared_ptr<data::SignalData> > data_set = get_data();
@@ -507,13 +511,14 @@ void SigSession::feed_in_logic(shared_ptr<Logic> logic)
 		set_capture_state(Running);
 
 		// Get sample limit.
-		uint64_t sample_limit;
-		try {
-			sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
-				device_->config_get(ConfigKey::LIMIT_SAMPLES)).get();
-		} catch (Error) {
-			sample_limit = 0;
-		}
+		const auto keys = device_->config_keys(
+			ConfigKey::DEVICE_OPTIONS);
+		const auto iter = keys.find(ConfigKey::LIMIT_SAMPLES);
+		const uint64_t sample_limit = (iter != keys.end() &&
+			(*iter).second.find(sigrok::GET) !=
+			(*iter).second.end()) ?
+			VariantBase::cast_dynamic<Variant<guint64>>(
+			device_->config_get(ConfigKey::LIMIT_SAMPLES)).get() : 0;
 
 		// Create a new data snapshot
 		cur_logic_snapshot_ = shared_ptr<data::LogicSnapshot>(
diff --git a/pv/toolbars/samplingbar.cpp b/pv/toolbars/samplingbar.cpp
index 4a692652..ddca7b59 100644
--- a/pv/toolbars/samplingbar.cpp
+++ b/pv/toolbars/samplingbar.cpp
@@ -177,9 +177,12 @@ void SamplingBar::update_sample_rate_selector()
 	assert(!updating_sample_rate_);
 	updating_sample_rate_ = true;
 
-	try {
+	const auto keys = device->config_keys(ConfigKey::DEVICE_OPTIONS);
+	const auto iter = keys.find(ConfigKey::SAMPLERATE);
+	if (iter != keys.end() &&
+		(*iter).second.find(sigrok::LIST) != (*iter).second.end()) {
 		gvar_dict = device->config_list(ConfigKey::SAMPLERATE);
-	} catch (Error error) {
+	} else {
 		sample_rate_.show_none();
 		updating_sample_rate_ = false;
 		return;
@@ -275,11 +278,14 @@ void SamplingBar::update_sample_count_selector()
 	if (sample_count == 0)
 		sample_count = DefaultSampleCount;
 
-	try {
+	const auto keys = device->config_keys(ConfigKey::DEVICE_OPTIONS);
+	const auto iter = keys.find(ConfigKey::LIMIT_SAMPLES);
+	if (iter != keys.end() &&
+		(*iter).second.find(sigrok::LIST) != (*iter).second.end()) {
 		auto gvar = device->config_list(ConfigKey::LIMIT_SAMPLES);
 		g_variant_get(gvar.gobj(), "(tt)",
 			&min_sample_count, &max_sample_count);
-	} catch (Error error) {}
+	}
 
 	min_sample_count = min(max(min_sample_count, MinSampleCount),
 		max_sample_count);