Collect and report file open error message.

Author: bpotchik

ui/qfileaccessor.h

@@ -7,12 +7,14 @@
 class BINARYNINJAUIAPI QFileAccessor : public BinaryNinja::FileAccessor
 {
 	QFile* m_file;
+	QString m_error;
 
 public:
 	QFileAccessor(const QString& name, bool write = false);
 	virtual ~QFileAccessor();
 
 	virtual bool IsValid() const;
+	virtual QString GetError() const;
 	virtual uint64_t GetLength() const;
 
 	virtual size_t Read(void* dest, uint64_t offset, size_t len);