How to deserialize and read files in ProtoBuf in C++?

In C++, file deserialization using the Protobuf library can be done by following these steps:

1. Include the necessary header files.

#include <fstream>
#include "your_protobuf_generated_header.pb.h"

1. Open the file to be deserialized and read the data within the file.

std::ifstream input("your_file_name", std::ios::binary);
if (!input) {
    std::cerr << "Failed to open input file." << std::endl;
    return -1;
}

your_protobuf_generated_message message;
if (!message.ParseFromIstream(&input)) {
    std::cerr << "Failed to parse input file." << std::endl;
    return -1;
}

1. Perform subsequent operations using the deserialized data, such as output or processing.

std::cout << "Deserialized message: " << message.DebugString() << std::endl;

In the above code, your_protobuf_generated_header.pb.h is the header file generated based on the .proto file, which includes the definition of Protobuf messages and related functions. your_protobuf_generated_message is the type of message you have defined for deserialization, which can be replaced according to the actual situation.

Above is a simple example of using the Protobuf library in C++ to read files and deserialize them. You can adjust and expand according to your specific needs.