diff --git a/doc/html/pip.qch b/doc/html/pip.qch
index bc62af5c..933667ad 100644
Binary files a/doc/html/pip.qch and b/doc/html/pip.qch differ
diff --git a/main.cpp b/main.cpp
index da053bec..6e5db56c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3,15 +3,11 @@
 
 
 int main(int argc, char *argv[]) {
-	PIVector2D<double> v(2, 2, PIVector<double>() << 1 << 2 << 3 << 4);
-	piCout << v;
-	PIByteArray ba;
-	ba << v;
-	piCout << ba.size();
-	PIVector2D<double> v2;
-	ba >> v2;
-	piCout << v2;
-	piCout << v2[0][1];
+	PIDir dir("");
+	PIVector<PIFile::FileInfo> el = dir.entries();
+	/*piCout << el.size();
+	piForeachC (PIFile::FileInfo & i, el)
+		piCout << i;*/
 	return 0;
 }
 
diff --git a/src_main/core/pibytearray.h b/src_main/core/pibytearray.h
index 599ed60e..082c2187 100755
--- a/src_main/core/pibytearray.h
+++ b/src_main/core/pibytearray.h
@@ -169,6 +169,8 @@ inline PIByteArray & operator <<(PIByteArray & s, const float v) {PBA_OPERATOR_T
 inline PIByteArray & operator <<(PIByteArray & s, const double & v) {PBA_OPERATOR_TO return s;}
 //! \relatesalso PIByteArray \brief Store operator
 inline PIByteArray & operator <<(PIByteArray & s, const ldouble & v) {PBA_OPERATOR_TO return s;}
+//! \relatesalso PIByteArray \brief Store operator
+template<typename T> inline PIByteArray & operator <<(PIByteArray & s, const PIFlags<T> & v) {PBA_OPERATOR_TO return s;}
 //! \relatesalso PIByteArray \brief Store operator, see \ref PIByteArray_sec1 for details
 inline PIByteArray & operator <<(PIByteArray & s, const PIByteArray & v) {s << int(v.size_s()); int os = s.size_s(); s.enlarge(v.size_s()); if (v.size_s() > 0) memcpy(s.data(os), v.data(), v.size()); return s;}
 //! \relatesalso PIByteArray \brief Store operator, see \ref PIByteArray_sec1 for details
@@ -205,6 +207,8 @@ inline PIByteArray & operator >>(PIByteArray & s, float & v) {assert(s.size() >=
 inline PIByteArray & operator >>(PIByteArray & s, double & v) {assert(s.size() >= sizeof(v)); PBA_OPERATOR_FROM return s;}
 //! \relatesalso PIByteArray \brief Restore operator
 inline PIByteArray & operator >>(PIByteArray & s, ldouble & v) {assert(s.size() >= sizeof(v)); PBA_OPERATOR_FROM return s;}
+//! \relatesalso PIByteArray \brief Restore operator
+template<typename T> inline PIByteArray & operator >>(PIByteArray & s, PIFlags<T> & v) {PBA_OPERATOR_FROM return s;}
 //! \relatesalso PIByteArray \brief Restore operator, see \ref PIByteArray_sec1 for details
 inline PIByteArray & operator >>(PIByteArray & s, PIByteArray & v) {assert(s.size_s() >= 4); int sz; s >> sz; v.resize(sz); if (sz > 0) memcpy(v.data(), s.data(), v.size()); s.remove(0, v.size()); return s;}
 //! \relatesalso PIByteArray \brief Restore operator, see \ref PIByteArray_sec1 for details
diff --git a/src_main/io/pibasetransfer.cpp b/src_main/io/pibasetransfer.cpp
index cf1e9256..21968db3 100644
--- a/src_main/io/pibasetransfer.cpp
+++ b/src_main/io/pibasetransfer.cpp
@@ -515,7 +515,7 @@ PIByteArray PIBaseTransfer::build_packet(int id) {
 	for (int i = 0; i < session[id].size_s(); i++) {
 		Part fi = session[id][i];
 		ret << fi;
-		//piCout << "biuld" << fi;
+		//piCout << "build" << fi;
 		ba = buildPacket(fi);
 		bytes_cur += ba.size();
 		if (ba.size() != fi.size) piCoutObj << "***error while build packet, wrong part size";
diff --git a/src_main/io/pifiletransfer.cpp b/src_main/io/pifiletransfer.cpp
index ec549aee..5366597b 100644
--- a/src_main/io/pifiletransfer.cpp
+++ b/src_main/io/pifiletransfer.cpp
@@ -70,13 +70,17 @@ bool PIFileTransfer::send(PIVector<PIFile::FileInfo> entries) {
 bool PIFileTransfer::sendFiles(const PIVector<PFTFileInfo> &files) {
 	files_ = files;
 	PIStringList names;
-	// 	piCoutObj << "prepare to send" << files_.size() << "files";
-	for(int i=0; i<files_.size_s(); i++) {
-		//		files_[i].path = dir.relative(files_[i].path);
-		if (names.contains(files_[i].path)) {files_.remove(i); i--;}
+	//piCoutObj << "prepare to send" << files_.size() << "files";
+	for (int i = 0; i < files_.size_s(); i++) {
+		//files_[i].path = dir.relative(files_[i].path);
+		if (names.contains(files_[i].path)) {
+			files_.remove(i);
+			--i;
+		}
 		else names << files_[i].path;
-		if (files_[i].isDir()) files_[i].size = 0;
-		//		piCout << "prepare" << i << files_[i].path << files_[i].dest_path << files_[i].name();
+		if (files_[i].isDir())
+			files_[i].size = 0;
+		//piCout << "prepare" << i << files_[i].path << files_[i].dest_path << files_[i].name();
 	}
 	randomize();
 	step_mutex.lock();
@@ -97,8 +101,8 @@ bool PIFileTransfer::sendFiles(const PIVector<PFTFileInfo> &files) {
 	step_mutex.lock();
 	pftheader.step = pft_Data;
 	PIVector<Part> pts;
-	for (int i=0; i<files_.size_s(); i++) {
-		pts << Part(i+1, files_[i].size);
+	for (int i = 0; i < files_.size_s(); i++) {
+		pts << Part(i + 1, files_[i].size);
 	}
 	buildSession(pts);
 	step_mutex.unlock();
@@ -120,7 +124,7 @@ void PIFileTransfer::processFile(int id, ullong start, PIByteArray & data) {
 	if (fi.isDir()) {
 		//piCoutObj << "make dir" << fi.entry.path;
 		if (!PIDir::make(path)) {
-			cur_file_string = "ERROR! while create directory " + path;
+			cur_file_string = "Error: While create directory \"" + path + "\"";
 			piCoutObj << cur_file_string;
 			stopReceive();
 			return;
@@ -132,7 +136,7 @@ void PIFileTransfer::processFile(int id, ullong start, PIByteArray & data) {
 			work_file.close();
 			//piCout << "new file" << path << work_file.path() << work_file.isOpened();
 			if (!work_file.open(path, PIIODevice::ReadWrite)) {
-				cur_file_string = "ERROR! while open file " + path;
+				cur_file_string = "Error: While open file \"" + path + "\"";
 				piCoutObj << cur_file_string;
 				stopReceive();
 				return;
@@ -161,7 +165,7 @@ void PIFileTransfer::processFile(int id, ullong start, PIByteArray & data) {
 		work_file.seek(start);
 		int rs = work_file.write(data.data(), data.size());
 		if (rs != data.size_s()) {
-			cur_file_string = "ERROR! while write file " + fi.path + " (must " + PIString::fromNumber(data.size()) + ", but write " + PIString::fromNumber(rs) + ")";
+			cur_file_string = "Error: While write file \"" + fi.path + "\" (must " + PIString::fromNumber(data.size()) + ", but write " + PIString::fromNumber(rs) + ")";
 			piCoutObj << cur_file_string;
 			stopReceive();
 			return;
@@ -183,15 +187,15 @@ PIByteArray PIFileTransfer::buildPacket(Part p) {
 			memcpy(ba.data(), desc.data(p.start), p.size);
 		return ba;
 		case pft_Data:
-			// 		piCout << "send data" << p.id << files_.size();
+			//piCout << "send data" << p.id << files_.size();
 			PIFile::FileInfo fi = files_[p.id-1];
 			if (fi.isFile()) {
-				// 			piCout << "send file" << fi.name() << fi.size;
+				//piCout << "send file" << fi.name() << fi.size;
 				PIString path = fi.path;
 				if (work_file.path() != path || !work_file.isOpened()) {
 					if (!work_file.open(path, PIIODevice::ReadOnly)) {
 						break_ = true;
-						cur_file_string = "ERROR! while open file " + fi.path;
+						cur_file_string = "Error: While open file \"" + fi.path + "\"";
 						piCoutObj << cur_file_string;
 						stopSend();
 						return PIByteArray();
@@ -202,16 +206,16 @@ PIByteArray PIFileTransfer::buildPacket(Part p) {
 				int rs = work_file.read(ba.data(), ba.size());
 				if ((llong)rs != (llong)p.size) {
 					break_ = true;
-					cur_file_string = "ERROR! while read file " + fi.path + " (must " + PIString::fromNumber(p.size) + ", but read " + PIString::fromNumber(rs) + ")";
+					cur_file_string = "Error: While read file \"" + fi.path + "\" (must " + PIString::fromNumber(p.size) + ", but read " + PIString::fromNumber(rs) + ")";
 					piCoutObj << cur_file_string;
 					stopSend();
 					return PIByteArray();
 				}
 			}
-			// 		if (fi.isDir()) {
-			// 			piCout << "create dir" << fi.path;
-			// 			dir.make(fi.path);
-			// 		}
+			//if (fi.isDir()) {
+			//	piCout << "create dir" << fi.path;
+			//	dir.make(fi.path);
+			//}
 			cur_file_string = fi.path;
 			bytes_file_all = fi.size;
 			bytes_file_cur = p.start;
@@ -230,7 +234,7 @@ void PIFileTransfer::receivePart(PIBaseTransfer::Part fi, PIByteArray ba, PIByte
 	StepType st = (StepType)h.step;
 	pftheader.step = st;
 	if (!h.check_sig()) {
-		cur_file_string = "ERROR check signature: File Transfer incompatable or invalid version!";
+		cur_file_string = "Error: Check signature: File Transfer incompatable or invalid version!";
 		piCoutObj << cur_file_string;
 		stopReceive();
 		return;
diff --git a/src_main/io/pifiletransfer.h b/src_main/io/pifiletransfer.h
index 9fdc9901..b13bcf4e 100644
--- a/src_main/io/pifiletransfer.h
+++ b/src_main/io/pifiletransfer.h
@@ -28,7 +28,7 @@
 
 #define __PIFILETRANSFER_VERSION 2
 
-class PIFileTransfer : public PIBaseTransfer
+class PIFileTransfer: public PIBaseTransfer
 {
 	PIOBJECT_SUBCLASS(PIFileTransfer, PIBaseTransfer)
 public:
@@ -36,8 +36,9 @@ public:
 	~PIFileTransfer();
 
 	enum StepType {pft_None, pft_Description, pft_Data};
-	struct PFTFileInfo : public PIFile::FileInfo {
-		PFTFileInfo(const PIFile::FileInfo &fi = PIFile::FileInfo()) : PIFile::FileInfo(fi) {}
+
+	struct PFTFileInfo: public PIFile::FileInfo {
+		PFTFileInfo(const PIFile::FileInfo &fi = PIFile::FileInfo()): PIFile::FileInfo(fi) {}
 		PIString dest_path;
 	};
 
@@ -112,9 +113,9 @@ inline PIByteArray & operator <<(PIByteArray & s, const PIFileTransfer::PFTHeade
 inline PIByteArray & operator >>(PIByteArray & s, PIFileTransfer::PFTHeader & v) {s >> v.raw_sig >> v.step >> v.session_id; return s;}
 
 inline PIByteArray & operator <<(PIByteArray & s, const PIFileTransfer::PFTFileInfo & v) {s << v.dest_path << v.size << v.time_access << v.time_modification <<
-	(int)v.flags << v.id_user << v.id_group << v.perm_user.raw << v.perm_group.raw << v.perm_other.raw; return s;}
+	v.flags << v.id_user << v.id_group << v.perm_user.raw << v.perm_group.raw << v.perm_other.raw; return s;}
 inline PIByteArray & operator >>(PIByteArray & s, PIFileTransfer::PFTFileInfo & v) {s >> v.dest_path >> v.size >> v.time_access >> v.time_modification >>
-	*(int*)(&(v.flags)) >> v.id_user >> v.id_group >> v.perm_user.raw >> v.perm_group.raw >> v.perm_other.raw; return s;}
+	v.flags >> v.id_user >> v.id_group >> v.perm_user.raw >> v.perm_group.raw >> v.perm_other.raw; return s;}
 
 inline PICout operator <<(PICout s, const PIFileTransfer::PFTFileInfo & v) {
 	s.setControl(0, true);
diff --git a/src_main/io/piiodevice.cpp b/src_main/io/piiodevice.cpp
index 70ad8dea..6c55a9a0 100755
--- a/src_main/io/piiodevice.cpp
+++ b/src_main/io/piiodevice.cpp
@@ -212,6 +212,8 @@ void PIIODevice::terminate() {
 
 void PIIODevice::begin() {
 	//cout << "   begin\n";
+	if (threadedReadBufferSize() == 0)
+		piCoutObj << "Warning: threadedReadBufferSize() == 0, read may be useless!";
 	thread_started_ = false;
 	if (!opened_) {
 		if (open()) {