Add protobuf with C++

code/C/my-plugin-daemon/README

@@ -8,7 +8,7 @@ sudo apt-get install autotools-dev intltool libpolkit-agent-1-dev libpolkit-gobj
 
 
 ###
-编译和运行(不是直接使用automake，而是使用mate-common提供的mate-autogen进行编译)
+编译和运行(不是直接使用automake，而是使用mate-common提供的mate-autogen进行编译。通过命令autoconf –-version 查看系统autoconf版本号，修改configure.ac文件中的AC_PREREQ字段，如：AC_PREREQ([2.69]))
 
 ./autogen.sh  --prefix=/usr
 

code/C/protobuf/Makefile

@@ -0,0 +1,24 @@
+#---- $@ 目标文件的名称		$^ 所有的依赖文件，以空格分开，不包含重复的依赖文件	$< 第一个依赖文件的名称 ----#
+
+CXX = g++
+CXXFLAGS += -std=c++14 -Wall -g
+#LDFLAGS = -lprotobuf
+LDFLAGS = `pkg-config --cflags --libs protobuf`
+
+all: myinfo test_in test_out
+
+myinfo:
+	protoc -I=./ --cpp_out=./ myinfo.proto
+
+test_in:test_in.c myinfo.pb.cc
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LDFLAGS)
+
+test_out:test_out.c myinfo.pb.cc
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LDFLAGS)
+
+clean:
+	rm -rf *.o
+	rm -rf test_in
+	rm -rf test_out
+	rm -rf myinfo.pb.*
+	rm -rf *.log

code/C/protobuf/README.md

@@ -0,0 +1,20 @@
+# protobuf demo
+
+Protobuf: Google Protocol Buffer 是 Google 公司内部的混合语言数据标准，用于 RPC 系统和持续数据存储系统。
+
+#### 介绍
+简要介绍 protobuf 在C++中的使用。
+
+#### 依赖
+libprotobuf-dev protobuf-compiler
+
+###根据.proto生成对应的.cc和.h文件
+protoc -I=./ --cpp_out=./ myinfo.proto
+
+###编译
+g++ -Wall -std=c++14 test_in.c myinfo.pb.cc -o test_in -lprotobuf
+g++ -Wall -std=c++14 test_out.c myinfo.pb.cc -o test_out -lprotobuf
+
+###运行
+./test_in
+./test_out

code/C/protobuf/myinfo.proto

@@ -0,0 +1,8 @@
+syntax = "proto2";
+package com.xiaoming.protobuf;
+
+message BufferMessage{
+      required int64  id = 1;
+      required string name = 2;
+      optional int32  opt = 3;
+}

code/C/protobuf/test_in.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2018 ~ 2020 [email protected]
+ *
+ * Authors:
+ *  lixiang    [email protected]
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "myinfo.pb.h"
+
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+using namespace com::xiaoming::protobuf;
+
+int main(int argc, char* argv[])
+{
+    BufferMessage msg;
+
+    msg.set_id(2019);
+    msg.set_name("lixiang");
+    msg.set_opt(1024);
+
+    fstream output("./protobuf.log", ios::out | ios::trunc | ios::binary);
+    if (!msg.SerializeToOstream(&output)){// SerializeToOstream 将对象序列化后写入一个 fstream 流
+        cerr << "save data error." << endl;
+        return -1;
+    }
+
+    return 0;
+}

code/C/protobuf/test_out.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 ~ 2020 [email protected]
+ *
+ * Authors:
+ *  lixiang    [email protected]
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "myinfo.pb.h"
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+using namespace com::xiaoming::protobuf;
+
+void printMsg(const BufferMessage &msg)
+{
+    cout << "id:" << msg.id() << endl;
+    cout << "name:" << msg.name() << endl;
+    if (msg.has_opt()) {
+        cout << "opt:" << msg.opt() << endl;
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    BufferMessage msg;
+    fstream input("./protobuf.log", ios::in | ios::binary);
+    if (!msg.ParseFromIstream(&input)){// ParseFromIstream 从一个 fstream 流中读取信息并反序列化
+        cerr << "read data from file error." << endl;
+        return -1;
+    }
+
+    printMsg(msg);
+
+    return 0;
+}