diff --git a/main.cpp b/main.cpp
index bc94fe44..6c3d4b45 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,6 +1,5 @@
 #include "pip.h"
 
 int main(int argc, char * argv[]) {
-	PIString s;
-	cout << "x: " << endl;
+	cout << PIString("Hello PIP!") << endl;
 };
diff --git a/piconfig.cpp b/piconfig.cpp
index 08d75257..b8a44937 100644
--- a/piconfig.cpp
+++ b/piconfig.cpp
@@ -236,7 +236,8 @@ void PIConfig::parse() {
 			sind = str.find('#');
 			if (sind > 0) {
 				comm = str.right(str.size() - sind - 1).trimmed();
-				setttype.push_back(comm[0]);
+				if (comm.length() > 0) setttype.push_back(comm[0]);
+				else setttype.push_back("s");
 				comm = comm.right(comm.size() - 1).trimmed();
 				settcom.push_back(comm);
 				str = str.left(sind);
diff --git a/piconsole.cpp b/piconsole.cpp
index 3303867a..bd465e98 100644
--- a/piconsole.cpp
+++ b/piconsole.cpp
@@ -217,6 +217,7 @@ void PIConsole::begin() {
 
 void PIConsole::run() {
 	uint cx, clen = 0;
+	string ts;
 #ifdef WINDOWS
 	GetConsoleScreenBufferInfo(hOut, &sbi);
 	width = sbi.srWindow.Right - sbi.srWindow.Left;
@@ -262,8 +263,10 @@ void PIConsole::run() {
 			case 13: clen = printValue(*tv.ull, tv.format); break;
 			case 14: clen = printValue(bitsValue(tv.uc, tv.bitFrom, tv.bitCount), tv.format); break;
 			}
-			if (clen + tv.offset < (uint)col_wid)
-				printf("%s", PIString(col_wid - clen - tv.offset, ' ').data());
+			if (clen + tv.offset < (uint)col_wid) {
+				ts = PIString(col_wid - clen - tv.offset, ' ').stdString();
+				printf("%s", ts.c_str());
+			}
 			newLine();
 		}
 	}
@@ -391,14 +394,19 @@ inline void PIConsole::printLine(const PIString & value, int dx, Flags<PIConsole
 #ifdef QNX
 	--i;
 #endif
-	couts(fstr(format).stdString());
-	if (i >= 0) couts((value + PIString(i, ' ')).stdString());
-	else couts(value.left(value.size() + i).stdString());
-	couts(fstr(Dec).stdString());
+	string ts = fstr(format).stdString();
+	couts(ts);
+	if (i >= 0) ts = (value + PIString(i, ' ')).stdString();
+	else ts = value.left(value.size() + i).stdString();
+	couts(ts);
+	ts = fstr(Dec).stdString();
+	couts(ts);
 }
 inline int PIConsole::printValue(const PIString & value, Flags<PIConsole::Format> format) {
-	couts(fstr(format).stdString());
-	int ret = couts(value.stdString());
+	string ts = fstr(format).stdString();
+	couts(ts);
+	ts = value.stdString();
+	int ret = couts(ts);
 	fstr(PIConsole::Dec);
 	return ret;
 }
diff --git a/pifile.cpp b/pifile.cpp
index a820792a..1b976227 100644
--- a/pifile.cpp
+++ b/pifile.cpp
@@ -5,11 +5,11 @@ bool PIFile::open(const PIString & path_, Flags<Mode> mode_) {
 	cpath = path_;
 	cmode = mode_;
 	if (cmode[New]) {
-		stream.open(cpath, fstream::in | fstream::out | fstream::trunc);
+		stream.open(cpath.stdString().c_str(), fstream::in | fstream::out | fstream::trunc);
 		stream.close();
 		cmode &= ~New;
-		stream.open(cpath, (fstream::openmode)(int)cmode | fstream::binary);
-	} else stream.open(cpath, (fstream::openmode)(int)cmode | fstream::binary);
+		stream.open(cpath.stdString().c_str(), (fstream::openmode)(int)cmode | fstream::binary);
+	} else stream.open(cpath.stdString().c_str(), (fstream::openmode)(int)cmode | fstream::binary);
 	return isOpened();
 }
 
diff --git a/pifile.h b/pifile.h
index 50ccfaba..40053045 100644
--- a/pifile.h
+++ b/pifile.h
@@ -17,7 +17,7 @@ public:
 	
 	bool open(const PIString & path, Flags<Mode> mode = Read | Write);
 	void close() {stream.close();}
-	void clear() {close(); stream.open(cpath, fstream::trunc | (fstream::openmode)(int)cmode);}
+	void clear() {close(); stream.open(cpath.stdString().c_str(), fstream::trunc | (fstream::openmode)(int)cmode);}
 	void seek(int position);
 	void resize(int new_size, char fill = 0);
 	void fill(char c) {stream.fill(c);}
diff --git a/piincludes.h b/piincludes.h
index d9ede183..5259ef07 100644
--- a/piincludes.h
+++ b/piincludes.h
@@ -33,6 +33,7 @@ typedef unsigned short int ushort;
 typedef unsigned int uint;
 typedef unsigned long ulong;
 typedef unsigned long long ullong;
+typedef long double ldouble;
 
 using std::cout;
 using std::cin;
diff --git a/pip.h b/pip.h
index 055f0c3d..d5966f8f 100644
--- a/pip.h
+++ b/pip.h
@@ -1,4 +1,4 @@
 #include "pitimer.h"
-#include "piconfig.h"
+#include "pivariable.h"
 #include "piconsole.h"
 #include "piprotocol.h"
diff --git a/piserial.cpp b/piserial.cpp
index e99c62db..79ec2f8a 100644
--- a/piserial.cpp
+++ b/piserial.cpp
@@ -19,22 +19,32 @@ PISerial::PISerial(PIString name, void * data_, SerialFunc slot): PIThread() {
 
 
 PISerial::~PISerial() {
-	stop();
-	pthread_cancel(thread);
+	terminate();
+	delete buffer;
+	delete sbuffer;
+}
+
+
+void PISerial::terminate() {
+	if (!initialized()) return;
+	if (isRunning()) {
+		stop();
+		pthread_cancel(thread);
+	}
 #ifdef WINDOWS
 	if (fd != -1) {
 		SetCommState(hCom, &sdesc);
 		SetCommMask(hCom, mask);
 		CloseHandle(hCom);
+		fd = -1;
 	}
 #else
 	if (fd != -1) {
 		tcsetattr(fd, TCSANOW, &sdesc);
 		close(fd);
+		fd = -1;
 	}
 #endif
-	delete buffer;
-	delete sbuffer;
 }
 
 
@@ -52,7 +62,8 @@ void PISerial::begin() {
 void PISerial::run() {
 	if (dataSize == 0) return;
 	char b;
-	int i = 0, j;
+	uint i = 0;
+	int j;
 #ifdef WINDOWS
 	WaitCommEvent(hCom, 0, 0);
 	ReadFile(hCom, buffer, dataSize, &readed, 0);
@@ -128,7 +139,7 @@ void PISerial::run() {
 			if (!tryagain) i++;
 		}
 	} else {
-		for (int i = 0; i < readed; ++i) {
+		for (uint i = 0; i < readed; ++i) {
 			b = buffer[i];
 			sbuffer[sbuffIndex] = b;
 			if (sbuffIndex == dataSize - 1) {
@@ -142,23 +153,15 @@ void PISerial::run() {
 
 
 void PISerial::end() {
+	terminate();
 	delete pbuffer;
 	delete hbuffer;
-	if (fd == -1) return;
-#ifdef WINDOWS
-	SetCommState(hCom, &sdesc);
-	CloseHandle(hCom);
-#else
-	tcsetattr(fd, TCSANOW, &sdesc);
-	close(fd);
-#endif
-	fd = -1;
 }
 
 
 bool PISerial::init() {
 #ifdef WINDOWS
-	hCom = CreateFile(devName.c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+	hCom = CreateFile(devName.stdString().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
 	if(hCom == INVALID_HANDLE_VALUE) {
 		cout << "[PISerial] Unable to open " << devName << endl;
 		return false;
diff --git a/piserial.h b/piserial.h
index 53121498..0e7185ec 100644
--- a/piserial.h
+++ b/piserial.h
@@ -31,7 +31,7 @@ class PISerial: public PIThread
 {
 public:
 	// slot is any function format "bool <func>(void*, char*)"
-	PISerial(PIString name, void * data, SerialFunc slot = 0);
+	PISerial(PIString name = "serial", void * data = 0, SerialFunc slot = 0);
 	~PISerial();
 
 	enum Parameters {IgnoreParityControl = 0x01, TwoStopBits = 0x02};
@@ -42,6 +42,7 @@ public:
 	void setInSpeed(int speed) {ispeed = speed;}
 	void setDevice(const PIString & dev) {devName = dev;}
 	void setParameters(Flags<PISerial::Parameters> parameters) {params = parameters;}
+	void setData(void * d) {data = d;}
 	void setReadData(void * headerPtr, int headerSize, int dataSize) {this->headerPtr = headerPtr;
 																	  this->headerSize = headerSize;
 																	  this->dataSize = dataSize;}
@@ -49,6 +50,7 @@ public:
 	bool send(char * data, int size);
 	bool init();
 	bool initialized() const {return fd != -1;}
+	void terminate();
 
 private:
 	void begin();
@@ -61,7 +63,7 @@ private:
 	DWORD readed, mask;
 #else
 	termios desc, sdesc;
-	int readed;
+	uint readed;
 #endif
 	int fd, ospeed, ispeed;
 	PIString devName;
diff --git a/pistring.cpp b/pistring.cpp
index 78b1e70a..5677d864 100644
--- a/pistring.cpp
+++ b/pistring.cpp
@@ -101,7 +101,8 @@ PIString & PIString::trim() {
 	for (int i = length() - 1; i >= 0; --i)
 		if (at(i) != ' ' && at(i) != '\t')
 			{fn = i; break;}
-	return cutMid(st, fn - st + 1);
+	*this = mid(st, fn - st + 1);
+	return *this;
 }
 
 
diff --git a/pivariable.cpp b/pivariable.cpp
new file mode 100644
index 00000000..438118a9
--- /dev/null
+++ b/pivariable.cpp
@@ -0,0 +1,144 @@
+#include "pivariable.h"
+
+
+void PIVariable::setVariable(const PIString & str) {
+	type_ = PIVariable::fromString(str);
+	size_ = PIVariable::variableSize(type_);
+}
+
+
+PIVariable::Type PIVariable::fromString(const PIString & str) {
+	PIString s = str.trimmed().toLowerCase();
+	if (s == "char" || s == "sbyte") return PIVariable::Char;
+	if (s == "short" || s == "short int" || s == "signed short" || s == "signed short int" || s == "sword") return PIVariable::Short;
+	if (s == "int" || s == "signed" || s == "signed int") return PIVariable::Int;
+	if (s == "long" || s == "long int" || s == "signed long" || s == "signed long int" || s == "sdword") return PIVariable::Long;
+	if (s == "llong" || s == "long long" || s == "long long int" || s == "signed long long" || s == "signed long long int" || s == "sqword") return PIVariable::LLong;
+	if (s == "uchar" || s == "byte") return PIVariable::UChar;
+	if (s == "ushort" || s == "unsigned short" || s == "unsigned short int" || s == "word") return PIVariable::UShort;
+	if (s == "uint" || s == "unsigned" || s == "unsigned int") return PIVariable::UInt;
+	if (s == "ulong" || s == "unsigned long" || s == "unsigned long int" || s == "dword") return PIVariable::ULong;
+	if (s == "ullong" || s == "unsigned long long" || s == "unsigned long long int" || s == "qword") return PIVariable::ULLong;
+	if (s == "float") return PIVariable::Float;
+	if (s == "double" || s == "real") return PIVariable::Double;
+	if (s == "ldouble" || s == "long double") return PIVariable::LDouble;
+	if (s == "bool") return PIVariable::Bool;
+	return PIVariable::Double;
+}
+
+
+PIString PIVariable::toString(const PIVariable::Type & var) {
+	switch (var) {
+	case PIVariable::Char: return "char";
+	case PIVariable::Short: return "short";
+	case PIVariable::Int: return "int";
+	case PIVariable::Long: return "long";
+	case PIVariable::LLong: return "llong";
+	case PIVariable::UChar: return "uchar";
+	case PIVariable::UShort: return "ushort";
+	case PIVariable::UInt: return "uint";
+	case PIVariable::ULong: return "ulong";
+	case PIVariable::ULLong: return "ullong";
+	case PIVariable::Float: return "float";
+	case PIVariable::Double: return "double";
+	case PIVariable::LDouble: return "ldouble";
+	case PIVariable::Bool: return "bool";
+	}
+	return "double";
+}
+
+
+uint PIVariable::variableSize(const PIVariable::Type & var) {
+	switch (var) {
+	case PIVariable::Char: return sizeof(char);
+	case PIVariable::Short: return sizeof(short);
+	case PIVariable::Int: return sizeof(int);
+	case PIVariable::Long: return sizeof(long);
+	case PIVariable::LLong: return sizeof(llong);
+	case PIVariable::UChar: return sizeof(uchar);
+	case PIVariable::UShort: return sizeof(ushort);
+	case PIVariable::UInt: return sizeof(uint);
+	case PIVariable::ULong: return sizeof(ulong);
+	case PIVariable::ULLong: return sizeof(ullong);
+	case PIVariable::Float: return sizeof(float);
+	case PIVariable::Double: return sizeof(double);
+	case PIVariable::LDouble: return sizeof(ldouble);
+	case PIVariable::Bool: return sizeof(bool);
+	}
+	return sizeof(double);
+}
+
+
+double PIVariable::variableValue(const char * var_ptr, const PIVariable::Type & var) {
+	switch (var) {
+	case PIVariable::Char: return (double)(*((char * )var_ptr));
+	case PIVariable::Short: return (double)(*((short * )var_ptr));
+	case PIVariable::Int: return (double)(*((int * )var_ptr));
+	case PIVariable::Long: return (double)(*((long * )var_ptr));
+	case PIVariable::LLong: return (double)(*((llong * )var_ptr));
+	case PIVariable::UChar: return (double)(*((uchar * )var_ptr));
+	case PIVariable::UShort: return (double)(*((ushort * )var_ptr));
+	case PIVariable::UInt: return (double)(*((uint * )var_ptr));
+	case PIVariable::ULong: return (double)(*((ulong * )var_ptr));
+	case PIVariable::ULLong: return (double)(*((ullong * )var_ptr));
+	case PIVariable::Float: return (double)(*((float * )var_ptr));
+	case PIVariable::Double: return (double)(*((double * )var_ptr));
+	case PIVariable::LDouble: return (ldouble)(*((ldouble * )var_ptr));
+	case PIVariable::Bool: return (double)(*((bool * )var_ptr));
+	}
+	return 0.;
+}
+
+
+void PIVariable::writeVariable(char * dest) {
+	switch (type_) {
+	case PIVariable::Char: *((char * )((int)dest + offset)) = value_; return;
+	case PIVariable::Short: *((short * )((int)dest + offset)) = value_; return;
+	case PIVariable::Int: *((int * )((int)dest + offset)) = value_; return;
+	case PIVariable::Long: *((long * )((int)dest + offset)) = value_; return;
+	case PIVariable::LLong: *((llong * )((int)dest + offset)) = value_; return;
+	case PIVariable::UChar: *((uchar * )((int)dest + offset)) = value_; return;
+	case PIVariable::UShort: *((ushort * )((int)dest + offset)) = value_; return;
+	case PIVariable::UInt: *((uint * )((int)dest + offset)) = value_; return;
+	case PIVariable::ULong: *((ulong * )((int)dest + offset)) = value_; return;
+	case PIVariable::ULLong: *((ullong * )((int)dest + offset)) = value_; return;
+	case PIVariable::Float: *((float * )((int)dest + offset)) = value_; return;
+	case PIVariable::Double: *((double * )((int)dest + offset)) = value_; return;
+	case PIVariable::LDouble: *((ldouble * )((int)dest + offset)) = value_; return;
+	case PIVariable::Bool: *((bool * )((int)dest + offset)) = value_; return;
+	}
+}
+
+
+void PIStruct::parseFile(const PIString & file) {
+	PIConfig conf(file);
+	PIVariable var;
+	PIString ts;
+	uint sz = 0;
+	vars.clear();
+	for (int i = 0; i < conf.numValues(); ++i) {
+		var.setVariable(conf.getValue(i));
+		var.setName(conf.getName(i));
+		var.offset = sz;
+		sz += var.size();
+		ts = conf.getComment(i);
+		if (ts.length() > 0)
+			var.setValue(ts.toDouble());
+		else var.setValue(0.);
+		vars.push_back(var);
+	}
+	size_ = sz;
+}
+
+
+void PIStruct::readData(const char * data) {
+	for (uint i = 0; i < vars.size(); ++i)
+		vars[i].readVariable(data);
+}
+
+
+void PIStruct::writeData(char * data) {
+	for (uint i = 0; i < vars.size(); ++i)
+		vars[i].writeVariable(data);
+}
+
diff --git a/pivariable.h b/pivariable.h
new file mode 100644
index 00000000..7c5d72d7
--- /dev/null
+++ b/pivariable.h
@@ -0,0 +1,97 @@
+#ifndef PIVARIABLE_H
+#define PIVARIABLE_H
+
+#include "piconfig.h"
+
+
+class PIVariable {
+public:
+	PIVariable() {;}
+	PIVariable(const PIString & str) {setVariable(str);}
+	~PIVariable() {;}
+	
+	enum Type {Char, Short, Int, Long, LLong, UChar, UShort, UInt, ULong, ULLong, Float, Double, LDouble, Bool};
+	typedef struct {
+		union {
+			char vChar;
+			short vShort;
+			int vInt;
+			long vLong;
+			llong vLLong;
+			uchar vUChar;
+			ushort vUShort;
+			uint vUInt;
+			ulong vULong;
+			ullong vULLong;
+			float vFloat;
+			double vDouble;
+			ldouble vLDouble;
+			bool vBool;
+		};
+		PIVariable::Type type;
+	} PIVariant;
+	
+	void setVariable(const PIString & str);
+	void writeVariable(char * dest);
+	inline void readVariable(const char * var_ptr) {value_ = PIVariable::variableValue((char * )((int)var_ptr + offset), type_);}
+	inline PIVariable::Type type() const {return type_;}
+	inline uint size() const {return size_;}
+	inline const PIString & name() {return name_;}
+	inline void setName(const PIString & str) {name_ = str;}
+	inline double value() const {return value_;}
+	inline void setValue(const double & val) {value_ = val;}
+	
+	int offset;
+	
+	static PIVariable::Type fromString(const PIString & str);
+	static PIString toString(const PIVariable::Type & var);
+	static uint variableSize(const PIVariable::Type & var);
+	static double variableValue(const char * var_ptr, const PIVariable::Type & var);
+	
+private:
+	PIVariable::Type type_;
+	uint size_;
+	PIString name_;
+	double value_;
+	
+};
+
+
+/* 
+ * PIStruct is abstract structure, described by *.conf file with format of each line:
+ * "<name> = <type> #<n|f|b> <start_value>".
+ * e.g. "pi = double #f 3.1418"
+ * 
+ * You can write or read binary content of this struct
+ * by functions "writeData" and "readData", e.g.
+ * "char * data = new char[struct.size()];
+ *  struct.writeData(data);"
+ * 
+ * Access to each variable in struct is looks like
+ * "double value = struct["pi"].value();"
+*/
+
+class PIStruct {
+public:
+	PIStruct() {;}
+	PIStruct(const PIString & str) {parseFile(str);}
+	
+	void parseFile(const PIString & file);
+	void readData(const char * data);
+	void writeData(char * data);
+	inline void clear() {vars.clear(); size_ = 0;}
+	inline uint count() const {return vars.size();}
+	inline uint size() const {return size_;}
+	inline const PIString & name() {return name_;}
+	inline void setName(const PIString & str) {name_ = str;}
+	inline PIVariable & operator[](const uint & index) {return vars[index];}
+	inline PIVariable & operator[](const PIString & name) {for (uint i = 0; i < vars.size(); ++i) if (vars[i].name() == name) return vars[i];}
+	
+private:
+	uint size_;
+	PIString name_;
+	vector<PIVariable> vars;
+	
+};
+
+#endif // PIVARIABLE_H