Add midi::Message::toString().

include/midi.hpp

@@ -75,6 +75,8 @@ struct Message {
 			return;
 		bytes[2] = value & 0x7f;
 	}
+
+	std::string toString();
 };
 
 ////////////////////
@@ -151,7 +153,7 @@ struct InputDevice : Device {
 	/** Not public. Use Driver::unsubscribeInput(). */
 	void unsubscribe(Input* input);
 	/** Called when a MIDI message is received from the device. */
-	void onMessage(const Message &message);
+	void onMessage(const Message& message);
 };
 
 struct OutputDevice : Device {
@@ -161,7 +163,7 @@ struct OutputDevice : Device {
 	/** Not public. Use Driver::unsubscribeOutput(). */
 	void unsubscribe(Output* output);
 	/** Sends a MIDI message to the device. */
-	virtual void sendMessage(const Message &message) {}
+	virtual void sendMessage(const Message& message) {}
 };
 
 ////////////////////
@@ -229,14 +231,14 @@ struct Input : Port {
 
 	std::vector<int> getChannels() override;
 
-	virtual void onMessage(const Message &message) {}
+	virtual void onMessage(const Message& message) {}
 };
 
 
 struct InputQueue : Input {
 	int queueMaxSize = 8192;
 	std::queue<Message> queue;
-	void onMessage(const Message &message) override;
+	void onMessage(const Message& message) override;
 };
 
 
@@ -254,7 +256,7 @@ struct Output : Port {
 
 	std::vector<int> getChannels() override;
 
-	void sendMessage(const Message &message);
+	void sendMessage(const Message& message);
 };
 
 

src/context.cpp

@@ -11,7 +11,10 @@ namespace rack {
 
 
 Context::~Context() {
+	// Deleting NULL is safe in C++.
+
 	// Set pointers to NULL so other objects will segfault when attempting to access them
+
 	delete patch;
 	patch = NULL;
 

src/midi.cpp

@@ -12,6 +12,23 @@ namespace midi {
 
 static std::vector<std::pair<int, Driver*>> drivers;
 
+std::string Message::toString() {
+	std::string s;
+	for (size_t i = 0; i < bytes.size(); i++) {
+		if (i > 0)
+			s += " ";
+		uint8_t b = bytes[i];
+		// We could use string::f() here, but use faster method instead.
+		// s += string::f("%02x", b);
+		uint8_t b1 = (b & 0x0f) >> 0;
+		uint8_t b2 = (b & 0xf0) >> 4;
+		s += b2 < 0xa ? ('0' + b2) : ('a' + b2 - 0xa);
+		s += b1 < 0xa ? ('0' + b1) : ('a' + b1 - 0xa);
+	}
+	return s;
+}
+
+
 ////////////////////
 // Device
 ////////////////////