diff --git a/src/io/pibinarylog.h b/src/io/pibinarylog.h
index 6ed9109f..63d319ce 100644
--- a/src/io/pibinarylog.h
+++ b/src/io/pibinarylog.h
@@ -37,7 +37,7 @@ class PIBinaryLog: public PIIODevice
 {
 	PIIODEVICE(PIBinaryLog)
 public:
-	PIBinaryLog();
+	explicit PIBinaryLog();
 	~PIBinaryLog() {closeDevice();}
 
 	//! \brief Play modes for \a PIBinaryLog
diff --git a/src/io/pifile.cpp b/src/io/pifile.cpp
index 682f98f3..8c96b857 100755
--- a/src/io/pifile.cpp
+++ b/src/io/pifile.cpp
@@ -137,13 +137,13 @@ PIFile::PIFile(const PIString & path, PIIODevice::DeviceMode mode): PIIODevice(p
 }
 
 
-PIFile::PIFile(const PIFile & other) {
-	fd = 0;
-	fdi = -1;
-	setPrecision(other.prec_);
-	setPath(other.path());
-	mode_ = other.mode_;
-}
+//PIFile::PIFile(const PIFile & other) {
+//	fd = 0;
+//	fdi = -1;
+//	setPrecision(other.prec_);
+//	setPath(other.path());
+//	mode_ = other.mode_;
+//}
 
 
 bool PIFile::openDevice() {
diff --git a/src/io/pifile.h b/src/io/pifile.h
index b1fbd120..bff83209 100755
--- a/src/io/pifile.h
+++ b/src/io/pifile.h
@@ -86,7 +86,11 @@ public:
 	//! Constructs a file with path "path" and open mode "mode"
 	explicit PIFile(const PIString & path, DeviceMode mode = ReadWrite);
 	
-	PIFile(const PIFile & other);
+
+	//! Open temporary file with open mode "mode"
+	bool openTemporary(PIIODevice::DeviceMode mode = PIIODevice::ReadWrite) {return open(PIString(tmpnam(0)), mode);}
+
+//	PIFile(const PIFile & other);
 	
 	~PIFile() {closeDevice();}
 	
@@ -176,7 +180,7 @@ public:
 	//! Write to file binary content of "v"
 	PIFile & writeBinary(const double v) {write(&v, sizeof(v)); return *this;}
 	
-	PIFile & operator =(const PIFile & f) {PIIODevice::setPath(f.path()); mode_ = f.mode_; return *this;}
+	//PIFile & operator =(const PIFile & f) {PIIODevice::setPath(f.path()); mode_ = f.mode_; return *this;}
 	
 	//! Write to file text representation of "v"
 	PIFile & operator <<(const char v) {if (canWrite() && fd != 0) write(&v, 1); return *this;}
@@ -244,9 +248,6 @@ public:
 
 	//!
 	static void setDefaultCharset(const char * c);
-
-	//! Returns opened temporary file with open mode "mode"
-	static PIFile openTemporary(PIIODevice::DeviceMode mode = PIIODevice::ReadWrite) {return PIFile(PIString(tmpnam(0)), mode);}
 	
 	//! Returns if file with path "path" does exists
 	static bool isExists(const PIString & path);
diff --git a/src/io/piiobytearray.h b/src/io/piiobytearray.h
index 975b92ba..97fdb398 100644
--- a/src/io/piiobytearray.h
+++ b/src/io/piiobytearray.h
@@ -32,10 +32,10 @@ class PIP_EXPORT PIIOByteArray: public PIIODevice
 public:
 	
 	//! Contructs %PIIOByteArray with \"buffer\" content and \"mode\" open mode
-	PIIOByteArray(PIByteArray * buffer = 0, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
+	explicit PIIOByteArray(PIByteArray * buffer = 0, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	
 	//! Contructs %PIIOByteArray with \"buffer\" content only for read
-	PIIOByteArray(const PIByteArray & buffer);
+	explicit PIIOByteArray(const PIByteArray & buffer);
 	
 	~PIIOByteArray() {closeDevice();}
 	
diff --git a/src/io/piiodevice.h b/src/io/piiodevice.h
index 6fd381eb..a033b826 100755
--- a/src/io/piiodevice.h
+++ b/src/io/piiodevice.h
@@ -53,7 +53,7 @@ class PIP_EXPORT PIIODevice: public PIThread
 public:
 	
 	//! Constructs a empty PIIODevice
-	PIIODevice();
+	explicit PIIODevice();
 
 	//! \brief Open modes for PIIODevice
 	enum DeviceMode {
@@ -70,7 +70,7 @@ public:
 
 	typedef PIFlags<DeviceOption> DeviceOptions;
 
-	PIIODevice(const PIString & path, DeviceMode mode = ReadWrite);
+	explicit PIIODevice(const PIString & path, DeviceMode mode = ReadWrite);
 	virtual ~PIIODevice();
 
 	//! Current open mode of device
@@ -356,6 +356,8 @@ private:
 	void run();
 	void end() {terminate();}
 	static void cacheFullPath(const PIString & full_path, const PIIODevice * d);
+	explicit PIIODevice(const PIIODevice & );
+	void operator =(const PIIODevice & );
 
 	PITimer timer;
 	PITimeMeasurer tm;
diff --git a/src/io/piiostring.h b/src/io/piiostring.h
index 78d3886d..55b2e060 100644
--- a/src/io/piiostring.h
+++ b/src/io/piiostring.h
@@ -32,10 +32,10 @@ class PIP_EXPORT PIIOString: public PIIODevice
 public:
 	
 	//! Contructs %PIIOString with \"string\" content and \"mode\" open mode
-	PIIOString(PIString * string = 0, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
+	explicit PIIOString(PIString * string = 0, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	
 	//! Contructs %PIIOString with \"string\" content only for read
-	PIIOString(const PIString & string);
+	explicit PIIOString(const PIString & string);
 	
 	~PIIOString() {closeDevice();}
 	
diff --git a/src/io/pipacketextractor.h b/src/io/pipacketextractor.h
index 07ec78b9..53ddb136 100755
--- a/src/io/pipacketextractor.h
+++ b/src/io/pipacketextractor.h
@@ -46,7 +46,7 @@ public:
 	};
 
 	//! Contructs extractor with child device "device_" and extract algorithm "mode"
-	PIPacketExtractor(PIIODevice * device_ = 0, SplitMode mode = None);
+	explicit PIPacketExtractor(PIIODevice * device_ = 0, SplitMode mode = None);
 
 	virtual ~PIPacketExtractor() {stop();}
 
diff --git a/src/io/pitransparentdevice.h b/src/io/pitransparentdevice.h
index f8e68b91..c6020eac 100644
--- a/src/io/pitransparentdevice.h
+++ b/src/io/pitransparentdevice.h
@@ -32,7 +32,7 @@ class PIP_EXPORT PITransparentDevice: public PIIODevice
 public:
 	
 	//! Contructs empty %PITransparentDevice
-	PITransparentDevice();
+	explicit PITransparentDevice();
 	
 	~PITransparentDevice() {closeDevice();}
 	
diff --git a/src/io/piusb.h b/src/io/piusb.h
index 8b1169d5..d31b3cdd 100755
--- a/src/io/piusb.h
+++ b/src/io/piusb.h
@@ -31,7 +31,7 @@ class PIP_EXPORT PIUSB: public PIIODevice
 {
 	PIIODEVICE(PIUSB)
 public:
-	PIUSB(ushort vid = 0, ushort pid = 0);
+	explicit PIUSB(ushort vid = 0, ushort pid = 0);
 	~PIUSB() {closeDevice();}
 
 	struct Endpoint {
diff --git a/src/piversion.h b/src/piversion.h
index 29a49d52..22ef44fb 100644
--- a/src/piversion.h
+++ b/src/piversion.h
@@ -3,7 +3,7 @@
 #define PIVERSION_H
 
 #define PIP_VERSION_MAJOR      0
-#define PIP_VERSION_MINOR      8
+#define PIP_VERSION_MINOR      9
 #define PIP_VERSION_REVISION   0
 #define PIP_VERSION_SUFFIX     ""
 
diff --git a/src/system/picodec.cpp b/src/system/picodec.cpp
index e64a150e..0c7f9ef1 100755
--- a/src/system/picodec.cpp
+++ b/src/system/picodec.cpp
@@ -31,7 +31,7 @@ PIStringList PICodec::availableCodecs() {
 
 
 PIByteArray PICodec::exec_iconv(const PIString & from, const PIString & to, const PIByteArray & str) {
-	tf.open();
+	tf.openTemporary(PIIODevice::ReadWrite);
 	tf.clear();
 	tf << str;
 	tf.close();
diff --git a/src/system/picodec.h b/src/system/picodec.h
index 74faad67..3fde3381 100755
--- a/src/system/picodec.h
+++ b/src/system/picodec.h
@@ -26,8 +26,8 @@ class PIP_EXPORT PICodec: private PIProcess
 {
 	PIOBJECT(PICodec)
 public:
-	PICodec(): PIProcess() {setGrabOutput(true); tf = PIFile::openTemporary(PIIODevice::ReadWrite); tf.open();}
-	PICodec(const PIString & from, const PIString & to): PIProcess() {setCodings(from, to); tf = PIFile::openTemporary(PIIODevice::ReadWrite);}
+	PICodec(): PIProcess() {setGrabOutput(true);}
+	PICodec(const PIString & from, const PIString & to): PIProcess() {setCodings(from, to);}
 	~PICodec() {tf.remove();}
 
 	void setFromCoding(const PIString & from) {c_from = from;}
diff --git a/src/system/piprocess.cpp b/src/system/piprocess.cpp
index 6dd3f265..ca3a1752 100755
--- a/src/system/piprocess.cpp
+++ b/src/system/piprocess.cpp
@@ -106,17 +106,17 @@ void PIProcess::startProc(bool detached) {
 	/// files for stdin/out/err
 	t_in = t_out = t_err = false;
 	if (f_in.path().isEmpty()) {
-		f_in = PIFile::openTemporary(PIIODevice::ReadWrite);
+		f_in.openTemporary(PIIODevice::ReadWrite);
 		t_in = true;
 	}
 	//f_in.open(PIIODevice::ReadWrite); f_in.close();
 	if (f_out.path().isEmpty()) {
-		f_out = PIFile::openTemporary(PIIODevice::ReadWrite);
+		f_out.openTemporary(PIIODevice::ReadWrite);
 		t_out = true;
 	}
 	//f_out.open(PIIODevice::WriteOnly); f_out.close();
 	if (f_err.path().isEmpty()) {
-		f_err = PIFile::openTemporary(PIIODevice::ReadWrite);
+		f_err.openTemporary(PIIODevice::ReadWrite);
 		t_err = true;
 	}
 	//f_err.open(PIIODevice::WriteOnly); f_err.close();