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protobuf入门教程(三)：常用序列化/反序列化接口

發布時間：2024/4/11 编程问答 23 豆豆

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C數組的序列化和反序列化

#include "addressbook.pb.h" #include <iostream> using namespace std;/* //C數組的序列化和序列化API //在/usr/local/include/google/目錄下，查找包含"SerializeToArray"所有的文件，同時打印所在行 //sudo grep "SerializeToArray" -r /usr/local/include/google/ -nbool SerializeToArray(void* data, int size) const; //序列化 bool ParseFromArray(const void* data, int size); //反序列化 */ char buf[1024]; int len;void set_person() {Person obj;obj.set_name("mike");obj.set_id(1);*obj.mutable_email() = "xxx@qq.com"; //obj.set_email("xxx@qq.com");len = obj.ByteSize(); //獲取長度cout << "len = " << len << endl;obj.SerializeToArray(buf, len);//序列化，obj成員保存在buf中 }void get_person() {Person obj;obj.ParseFromArray(buf, len); //反序列化，buf的內容設置給obj的成員cout << "name = " << obj.name() << endl;cout << "id = " << obj.id() << endl;cout << "email = " << obj.email() << endl; }int main() {// Verify that the version of the library that we linked against is// compatible with the version of the headers we compiled against.GOOGLE_PROTOBUF_VERIFY_VERSION;set_person(); //序列化get_person(); //反序列化// Optional: Delete all global objects allocated by libprotobuf.google::protobuf::ShutdownProtobufLibrary();return 0; }

C++ String的序列化和反序列化

//bool SerializeToString(string* output) const; //bool ParseFromString(const string& data); string str; //全局變量void set_person() {Person obj;obj.set_name("mike");obj.set_id(1);obj.set_email("xxx@qq.com");//*obj.mutable_email() = "xxx@qq.com";obj.SerializeToString(&str); //序列化，obj成員的內容設置給str }void get_person() {Person obj;obj.ParseFromString(str); //反序列化, str內容設置給obj的成員cout << "name = " << obj.name() << endl;cout << "id = " << obj.id() << endl;cout << "email = " << *obj.mutable_email() << endl; }

文件描述符序列化和反序列化

//bool SerializeToFileDescriptor(int file_descriptor) const; //bool ParseFromFileDescriptor(int file_descriptor); void set_person() {Person obj;obj.set_name("mike");obj.set_id(1);obj.set_email("xxx@qq.com");//*obj.mutable_email() = "xxx@qq.com";//O_CREAT: 新建文件， O_TRUNC：清空文件，O_RDWR：讀寫int fd = open("./pb.xxx", O_CREAT | O_TRUNC | O_RDWR, 0644);if (fd <= 0){perror("open");exit(0);}obj.SerializeToFileDescriptor(fd); //序列化，obj成員的內容寫入fd所關聯的文件中close(fd); //關閉文件 }void get_person() {int fd = open("./pb.xxx", O_RDONLY); //O_RDONLY：只讀方式if (fd <= 0){perror("open");exit(0);}Person obj;obj.ParseFromFileDescriptor(fd); //反序列化, fd文件內容設置給obj的成員close(fd); //關閉文件cout << "name = " << obj.name() << endl;cout << "id = " << obj.id() << endl;cout << "email = " << *obj.mutable_email() << endl; }

C++ stream 序列化和反序列化

//bool SerializeToOstream(ostream* output) const; //bool ParseFromIstream(istream* input); void set_person() {Person obj;obj.set_name("mike");obj.set_id(1);obj.set_email("xxx@qq.com");//*obj.mutable_email() = "xxx@qq.com";fstream output("pb.xxx", ios::out | ios::trunc | ios::binary);bool flag = obj.SerializeToOstream(&output);//序列化if (!flag){cerr << "Failed to write file." << endl;return;}output.close();//關閉文件 }void get_person() {Person obj;fstream input("./pb.xxx", ios::in | ios::binary);obj.ParseFromIstream(&input); //反序列化input.close(); //關閉文件cout << "name = " << obj.name() << endl;cout << "id = " << obj.id() << endl;cout << "email = " << *obj.mutable_email() << endl; }

本教程源代碼下載地址：http://download.csdn.net/detail/tennysonsky/9884275

本文轉自：http://blog.csdn.net/sealyao/article/details/6940245

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