embdding added

zpoint · zpoint · commit dc1036d5fa33 · 2017-09-22T17:21:50.000+08:00
diff --git a/Examples/embedding/README.md b/Examples/embedding/README.md
@@ -0,0 +1,18 @@
+# embdding
+
+###### python3 embdding
+
+    make
+    ./embdding
+
+    I am called from cpp
+    sys.version:  3.5.2 (default, Sep 14 2017, 22:51:06)
+    [GCC 5.4.0 20160609]
+    In cpp, method 1, five_squared: 25
+    In cpp, method 2, five_squared: 25
+    catch ZeroDivisionError in cpp
+    Traceback (most recent call last):
+      File "<string>", line 1, in <module>
+    ZeroDivisionError: division by zero
+    In python, going to sleep for 20 seconds
+
diff --git a/Examples/embedding/embdding.cpp b/Examples/embedding/embdding.cpp
@@ -0,0 +1,68 @@
+#include <iostream>
+#include <string>
+#include <boost/python.hpp>
+using namespace boost::python;
+
+void running_python_code(const char *code)
+{
+		object main_module = import("__main__");
+		object main_namespace = main_module.attr("__dict__");
+		object result = exec(code, main_namespace);
+}
+
+void get_result()
+{
+		int five_squared;
+
+		object main_module = import("__main__");
+		object main_namespace = main_module.attr("__dict__");
+		// method 1
+		object ignored = exec("result = 5 ** 2", main_namespace);
+		five_squared = extract<int>(main_namespace["result"]);
+		std::cout << "In cpp, method 1, five_squared: " << five_squared << std::endl;
+		// method 2
+		object result = eval("5 ** 2");
+		five_squared = extract<int>(result);
+		std::cout << "In cpp, method 2, five_squared: " << five_squared << std::endl;
+}
+
+void exception_handling()
+{
+		try
+		{
+				object result = eval("5/0");
+				std::cout << "I will never be printed" << std::endl;
+		}
+		catch (error_already_set const &)
+		{
+				if (PyErr_ExceptionMatches(PyExc_ZeroDivisionError))
+				{
+						std::cout << "catch ZeroDivisionError in cpp" << std::endl;
+						PyErr_Print();
+				}
+				else
+						PyErr_Print();
+		}
+}
+
+void sleep_for_20_seconds()
+{
+		object main_module = import("__main__");
+		object main_namespace = main_module.attr("__dict__");
+		exec("print(\"In python, going to sleep for 20 seconds\")\n"
+			 "import time\n"
+			 "time.sleep(20)", main_namespace);
+		
+}
+
+int main()
+{
+		Py_Initialize();
+		running_python_code("import sys\n"
+						"print(\"I am called from cpp\")\n"
+						"print(\"sys.version: \", sys.version)");
+		get_result();
+		exception_handling();
+		sleep_for_20_seconds();
+		return 0;
+}
diff --git a/Examples/embedding/makefile b/Examples/embedding/makefile
@@ -0,0 +1,24 @@
+PYTHON_VERSION = 3.5
+TARGET = embdding
+
+CFLAGS = -lm -pthread -O3 -std=c++11 -march=native -Wall -funroll-loops -Wno-unused-result
+
+PYTHON_INCLUDE = /usr/include/python$(PYTHON_VERSION)
+ 
+# Only need if install from source
+
+BOOST_INC = /usr/local/include/boost
+BOOST_LIB = /usr/local/lib
+
+
+ifeq ($(PYTHON_VERSION), 3.5)
+	BOOST = lboost_python3
+	PYTHON_VERSION_FINAL = $(PYTHON_VERSION)m
+else
+	BOOST = lboost_python
+	PYTHON_VERSION_FINAL = $(PYTHON_VERSION)
+endif
+
+ 
+$(TARGET): $(TARGET).cpp
+	g++ $(CFLAGS) -I$(PYTHON_INCLUDE) -I$(BOOST_INC) -L/usr/lib/python$(PYTHON_VERSION)/config $(TARGET).cpp -o $(TARGET) -lpython$(PYTHON_VERSION_FINAL) -$(BOOST) -lboost_system
diff --git a/README.md b/README.md
@@ -31,6 +31,8 @@
 		* [enums](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/enums)
 		* [reference_count](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/reference_count)
 
+	* [embedding](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/embedding)
+
 ##### Boost Installation with python3 support
 
 * OS Ubuntu 16.10
