Qt 编译配置 Protobuf 的详细步骤

sudo apt-get install -y protobuf-compiler libprotobuf-dev

brew install protobuf

# 指定Protobuf编译器
PROTOC = protoc
# 指定Protobuf源文件目录和生成目录
PROTO_SOURCES_DIR = $$PWD/proto
PROTO_GENERATED_DIR = $$PWD/generated
# 查找所有的.proto文件
PROTO_FILES = $$files($$PROTO_SOURCES_DIR/*.proto)
# 添加包含路径
INCLUDEPATH += $$PROTO_GENERATED_DIR
# 生成Protobuf源文件规则
protobuf.commands = $$PROTOC -I=$$PROTO_SOURCES_DIR --cpp_out=$$PROTO_GENERATED_DIR $$<
# 定义构建步骤
for(protoFile, PROTO_FILES) {
    generatedFiles += $$PROTO_GENERATED_DIR/$${basename(protoFile)}.pb.cc
    generatedFiles += $$PROTO_GENERATED_DIR/$${basename(protoFile)}.pb.h
    QMAKE_EXTRA_COMPILERS += protobuf
    protobuf.input = PROTO_SOURCES_DIR/$${basename(protoFile)}.proto
    protobuf.output = generatedFiles
    QMAKE_EXTRA_COMPILERS += protobuf
}
# 添加生成的源文件到项目
SOURCES += $$generatedFiles
HEADERS += $$generatedFiles
# 链接Protobuf库
LIBS += -lprotobuf

syntax = "proto3";
message Example {
    int32 id = 1;
    string name = 2;
}

qmake

make

#include <QCoreApplication>
#include <iostream>
#include "message.pb.h"  // 生成的头文件
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    // 创建并填充Example消息
    Example example;
    example.set_id(123);
    example.set_name("Qt with Protobuf");
    // 序列化到字符串
    std::string output;
    if (!example.SerializeToString(&output)) {
        std::cerr << "Failed to serialize the message." << std::endl;
        return -1;
    }
    // 反序列化
    Example example2;
    if (!example2.ParseFromString(output)) {
        std::cerr << "Failed to parse the message." << std::endl;
        return -1;
    }
    // 输出消息内容
    std::cout << "ID: " << example2.id() << std::endl;
    std::cout << "Name: " << example2.name() << std::endl;
    return a.exec();
}