Fix MIDI import encoding issue on Windows

Author: PhysSong

include/ImportFilter.h

@@ -78,6 +78,11 @@ class EXPORT ImportFilter : public Plugin
 		return m_file.read( _data, _len );
 	}
 
+	inline QByteArray readAllData()
+	{
+		return m_file.readAll();
+	}
+
 	inline void ungetChar( char _ch )
 	{
 		m_file.ungetChar( _ch );

plugins/MidiImport/MidiImport.cpp

@@ -26,9 +26,12 @@
 #include <QDomDocument>
 #include <QDir>
 #include <QApplication>
+#include <QFile>
 #include <QMessageBox>
 #include <QProgressDialog>
 
+#include <sstream>
+
 #include "MidiImport.h"
 #include "TrackContainer.h"
 #include "InstrumentTrack.h"
@@ -279,8 +282,6 @@ class smfMidiChannel
 
 bool MidiImport::readSMF( TrackContainer* tc )
 {
-	QString filename = file().fileName();
-	closeFile();
 
 	const int preTrackSteps = 2;
 	QProgressDialog pd( TrackContainer::tr( "Importing MIDI-file..." ),
@@ -291,7 +292,11 @@ bool MidiImport::readSMF( TrackContainer* tc )
 
 	pd.setValue( 0 );
 
-	Alg_seq_ptr seq = new Alg_seq(filename.toLocal8Bit(), true);
+	std::stringstream stream;
+	QByteArray arr = readAllData();
+	stream.str(std::string(arr.constData(), arr.size()));
+
+	Alg_seq_ptr seq = new Alg_seq(stream, true);
 	seq->convert_to_beats();
 
 	pd.setMaximum( seq->tracks()  + preTrackSteps );