diff --git a/doc/examples/pichunkstream.cpp b/doc/examples/pichunkstream.cpp
index ec2048eb..dc6003ce 100644
--- a/doc/examples/pichunkstream.cpp
+++ b/doc/examples/pichunkstream.cpp
@@ -47,3 +47,21 @@ while (!cs2.atEnd()) {
 }
 piCout << i << str << f << s.i << s.f << s.s;
 //! [read]
+
+//! [write_new]
+PIByteArray & operator <<(PIByteArray & s, const S & value) {
+	PIChunkStream cs;
+	cs.add(1, value.i).add(2, value.f).add(3, value.s);
+	s << cs.data();
+	return s;
+}
+//! [write_new]
+//! [read_new]
+PIByteArray & operator >>(PIByteArray & s, S & value) {
+	PIChunkStream cs;
+	if (!cs.extract(s)) return s;
+	cs.readAll();
+	cs.get(1, value.i).get(2, value.f).get(3, value.s);
+	return b;
+}
+//! [read_new]
diff --git a/libs/main/core/pichunkstream.cpp b/libs/main/core/pichunkstream.cpp
index ba6f9e4d..b5525aa3 100644
--- a/libs/main/core/pichunkstream.cpp
+++ b/libs/main/core/pichunkstream.cpp
@@ -127,12 +127,14 @@ PIChunkStream::~PIChunkStream() {
 }
 
 
-bool PIChunkStream::extract(PIByteArray & data) {
+bool PIChunkStream::extract(PIByteArray & data, bool read_all) {
 	if (data.size_s() < 4) return false;
 	data >> tmp_data;
 	if (tmp_data.size_s() < 4) return false;
 	data_ = &tmp_data;
 	_init();
+	if (read_all)
+		readAll();
 	return true;
 }
 
diff --git a/libs/main/core/pichunkstream.h b/libs/main/core/pichunkstream.h
index d771143b..256c620d 100644
--- a/libs/main/core/pichunkstream.h
+++ b/libs/main/core/pichunkstream.h
@@ -67,8 +67,10 @@ public:
 	//! Add data to this chunk strean with ID "id" and value "data"
 	template <typename T> PIChunkStream & add(int id, const T & data) {*this << ChunkConst<T>(id, data); return *this;}
 
-	//! Extract %PIByteArray from "data" and set it current stream. Returns if has data to read.
-	bool extract(PIByteArray & data);
+	//! Extract %PIByteArray from "data" and set it current stream.
+	//! If "read_all" then call \a readAll() after extract.
+	//! Returns if has data to read.
+	bool extract(PIByteArray & data, bool read_all = false);
 
 	void setSource(const PIByteArray & data);
 	void setSource(PIByteArray * data);