update

与Python交互/C程序中嵌入python解释器/helloworld/build.sh

@@ -1 +1,14 @@
-gcc -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -o helloworld main.c
+g++ -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -o helloworld.o -std=c++20 -c helloworld.cpp
+g++ -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -o helloworld_wrap.o -std=c++20 -c helloworld_wrap.cpp
+g++ -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -o main.o -std=c++20 -c main.cpp 
+
+
+g++ -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -std=c++20 *.o -o helloworld
+
+
+
+
+g++ -I /Users/mac/micromamba/envs/py3.10/include/python3.10 -L/Users/mac/micromamba/envs/py3.10/lib -lpython3.10 -o helloworld -std=c++20 helloworld.cpp helloworld_wrap.cpp main.cpp 
+
+
+gcc *.c -o

与Python交互/C程序中嵌入python解释器/helloworld/helloworld.cpp

@@ -0,0 +1 @@
+int numargs = 0;

与Python交互/C程序中嵌入python解释器/helloworld/helloworld.h

@@ -0,0 +1,9 @@
+
+
+/* $Id$ */
+#ifndef HELLOWORLD_H
+#define HELLOWORLD_H//一般是文件名的大写 头文件结尾写上一行
+
+int numargs;
+
+#endif

与Python交互/C程序中嵌入python解释器/helloworld/helloworld_wrap.cpp

@@ -0,0 +1,17 @@
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "helloworld.h"
+/* Return the number of arguments of the application command line */
+static PyObject* emb_numargs(PyObject* self, PyObject* args) {
+    if (!PyArg_ParseTuple(args, ":numargs"))
+        return NULL;
+    return PyLong_FromLong(numargs);
+}
+
+static PyMethodDef EmbMethods[] = {{"numargs", emb_numargs, METH_VARARGS, "Return the number of arguments received by the process."}, {NULL, NULL, 0, NULL}};
+
+static PyModuleDef EmbModule = {PyModuleDef_HEAD_INIT, "emb", NULL, -1, EmbMethods, NULL, NULL, NULL, NULL};
+
+static PyObject* PyInit_emb(void) {
+    return PyModule_Create(&EmbModule);
+}

与Python交互/C程序中嵌入python解释器/helloworld/helloworld_wrap.h

@@ -0,0 +1,13 @@
+/* $Id$ */
+#ifndef HELLOWORLD_WRAP_H
+#define HELLOWORLD_WRAP_H
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+
+// static PyObject* emb_numargs(PyObject* self, PyObject* args);
+// static PyMethodDef EmbMethods[];
+// static PyModuleDef EmbModule;
+static PyObject* PyInit_emb(void);
+
+#endif

与Python交互/C程序中嵌入python解释器/helloworld/main.cpp

@@ -0,0 +1,132 @@
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include <exception>
+#include <filesystem>
+#include "helloworld.h"
+#include "helloworld_wrap.h"
+#include "scope_guard.hpp"
+
+class AppException : public std::runtime_error {
+   public:
+    AppException(const char* err) : std::runtime_error(err) {}
+};
+
+void init_py(char* programname, char* envpath, char* pymodulepath, bool debugmod) {
+    wchar_t* program;
+    wchar_t* env_dir_name;
+    wchar_t* pymodule_dir_name;
+    program = Py_DecodeLocale(programname, NULL);
+    if (program == NULL) {
+        throw AppException("Fatal error: cannot decode programname");
+    }
+
+    // 初始化python设置
+    PyStatus status;
+    PyConfig config;
+    PyConfig_InitPythonConfig(&config);
+    auto guard = sg::make_scope_guard([&config]() noexcept {
+        PyConfig_Clear(&config);
+        printf("python init config clear\n");
+    });
+
+    // 设置python程序名
+    status = PyConfig_SetString(&config, &config.program_name, program);
+    if (PyStatus_Exception(status)) {
+        throw AppException("Fatal error: InitPythonConfig set program_name get error");
+    }
+    // 加载默认配置
+    status = PyConfig_Read(&config);
+    if (PyStatus_Exception(status)) {
+        throw AppException("Fatal error: PyConfig_Read get error");
+    }
+    // 设置python的sys.path用于查找模块
+    std::filesystem::path pymodule_dir;
+    if (pymodulepath == NULL) {
+        pymodule_dir = std::filesystem::current_path();
+    } else {
+        pymodule_dir = pymodulepath;
+        if (pymodule_dir.is_relative()) {
+            pymodule_dir = std::filesystem::absolute(pymodule_dir);
+        }
+    }
+    auto _pymodule_dir_name = pymodule_dir.string().c_str();
+    pymodule_dir_name = Py_DecodeLocale(_pymodule_dir_name, NULL);
+    if (pymodule_dir_name == NULL) {
+        throw AppException("Fatal error: cannot decode pymodule_dir_name");
+    } else {
+        if (debugmod) {
+            printf("pymodule_dir %s \n", _pymodule_dir_name);
+        }
+    }
+    config.module_search_paths_set = 1;
+    status = PyWideStringList_Append(&config.module_search_paths, pymodule_dir_name);
+    if (PyStatus_Exception(status)) {
+        throw AppException("Fatal error: InitPythonConfig set module_search_paths get error");
+    }
+
+    // 设置虚拟环境
+    if (envpath != NULL) {
+        std::filesystem::path env_dir = envpath;
+        if (env_dir.is_relative()) {
+            env_dir = std::filesystem::absolute(env_dir);
+        }
+        auto _env_dir_name = env_dir.string().c_str();
+        env_dir_name = Py_DecodeLocale(_env_dir_name, NULL);
+        if (env_dir_name == NULL) {
+            throw AppException("Fatal error: cannot decode _env_dir_name");
+        } else {
+            if (debugmod) {
+                printf("use virtual environments %s \n", _env_dir_name);
+            }
+        }
+        status = PyConfig_SetString(&config, &config.prefix, env_dir_name);
+        if (PyStatus_Exception(status)) {
+            throw AppException("Fatal error: InitPythonConfig set prefix get error");
+        }
+        status = PyConfig_SetString(&config, &config.exec_prefix, env_dir_name);
+        if (PyStatus_Exception(status)) {
+            throw AppException("Fatal error: InitPythonConfig set exec_prefix get error");
+        }
+    }
+    // 提前初始化模块`emb`
+    numargs = 10;
+    PyImport_AppendInittab("emb", &PyInit_emb);
+
+    status = Py_InitializeFromConfig(&config);
+    if (PyStatus_Exception(status)) {
+        if (PyStatus_IsExit(status)) {
+            // return status.exitcode;
+            throw AppException("Fatal error: PyStatus_IsExit");
+        }
+        // 抛出错误
+        Py_ExitStatusException(status);
+    }
+    PyMem_RawFree(pymodule_dir_name);
+    if (envpath != NULL) {
+        PyMem_RawFree(env_dir_name);
+    }
+    PyMem_RawFree(program);
+    if (debugmod) {
+        PyRun_SimpleString("import sys;print(sys.path);print(sys.prefix)");
+    }
+}
+
+int finalize_py() {
+    if (Py_FinalizeEx() < 0) {
+        return 120;
+    }
+    printf("finalize_py ok\n");
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    // 初始化python解释器
+    try {
+        init_py(argv[0], "env/", NULL, false);
+        PyRun_SimpleString("import emb;print('Number of arguments', emb.numargs())");
+    } catch (const AppException& ex) {
+        fprintf(stderr, ex.what());
+        return 1;
+    }
+    return finalize_py();
+}