ch2-07: 实现例子

examples/ch2-07/hello-py/Makefile

@@ -0,0 +1,11 @@
+default:
+	go build -buildmode=c-shared -o gopkg.so main.go
+	python3 -c 'import gopkg; print(gopkg.system("time"))'
+
+clean:
+	-rm *.so
+
+# PKG_CONFIG=python3-config go build -buildmode=c-shared -o say-hello.so main.go
+# python3-config --ldflags
+# python3-config --include
+

examples/ch2-07/hello-py/main.go

@@ -0,0 +1,51 @@
+package main
+
+/*
+// macOS:
+// python3-config --cflags
+// python3-config --ldflags
+#cgo darwin CFLAGS: -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -fno-strict-aliasing -Wsign-compare -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes  -g
+#cgo darwin LDFLAGS: -L/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/config-3.6m-darwin -lpython3.6m -ldl -framework CoreFoundation
+
+// linux
+#cgo linux pkg-config: python3
+
+// windows
+// should generate libpython3.a from python3.lib
+
+#define Py_LIMITED_API
+#include <Python.h>
+
+static PyObject *
+spam_system(PyObject *self, PyObject *args) {
+	const char *command;
+	if (!PyArg_ParseTuple(args, "s", &command)) {
+		return NULL;
+	}
+
+	int status = system(command);
+	return PyLong_FromLong(status);
+}
+
+static PyMethodDef modMethods[] = {
+	{"system",  spam_system, METH_VARARGS, "Execute a shell command."},
+	{NULL, NULL, 0, NULL}
+};
+
+void* PyInit_gopkg(void) {
+	static struct PyModuleDef module = {
+		PyModuleDef_HEAD_INIT, "gopkg", NULL, -1, modMethods,
+	};
+	return (void*)PyModule_Create(&module);
+}
+*/
+import "C"
+
+import "fmt"
+
+func main() {}
+
+//  export SayHello
+func SayHello(name *C.char) {
+	fmt.Printf("hello %s!\n", C.GoString(name))
+}