added support for debug messages from remote plugin (stable backport)

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/branches/lmms/stable-0.4@1899 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/remote_plugin.h

@@ -483,6 +483,7 @@ enum RemoteMessageIDs
 	IdLoadSettingsFromString,
 	IdLoadSettingsFromFile,
 	IdLoadPresetFromFile,
+	IdDebugMessage,
 	IdUserBase = 64
 } ;
 
@@ -818,6 +819,11 @@ public:
 		return m_outputCount;
 	}
 
+	void debugMessage( const std::string & _s )
+	{
+		sendMessage( message( IdDebugMessage ).addString( _s ) );
+	}
+
 
 private:
 	void setShmKey( key_t _key, int _size );

src/core/remote_plugin.cpp

@@ -355,6 +355,11 @@ bool remotePlugin::processMessage( const message & _m )
 			resizeSharedProcessingMemory();
 			break;
 
+		case IdDebugMessage:
+			fprintf( stderr, "RemotePlugin::DebugMessage: %s",
+						_m.getString( 0 ).c_str() );
+			break;
+
 		case IdProcessingDone:
 		case IdQuit:
 		default: