参考连接：https://blog.csdn.net/u014340533/article/details/125528855
1、编译环境
操作系统：windows10
Qt版本：5.15.2
编译器：MinGW8.1.0
CMake：3.23.1
Git：2.39.2
NASM：2.14.02
配置Qt环境变量
2、grpc源码下载
grpc源码地址：https://github.com/grpc/grpc
因为我的Qt版本是5.15.2，只能用低版本的grpc，目前测试成功的版本是grpc3.16.3
下载指定版本grpc并将子模块一起下载
创建一个文件夹，打开git bash，运行以下命令，下载grpc源码
git clone --recurse-submodules -b v1.36.3 https://github.com/grpc/grpc.git
3、cmake构建 makefile文件
在grpc目录下新建mingw64文件夹，打开CMake，选择源码路径和构建路径
点击Configure按钮，在弹出框中选择MinGW Makefiles，点击Finish按钮。
配置完成，显示Configuring done
点击Generate按钮，生成Makefile文件，显示Generating done
4、minGW 8.1.0编译源码
点击开始，找到Qt目录，找到Qt5.15.2（MinGW 8.10 64-bit），右键选择以管理员身份运行（安装时需要管理员身份）
进入mingw64目录，执行mingw32-make
编译完成
5.安装
编译完成后，执行命令
mingw32-make install
至此，windows下使用MinGW编译grpc完成。
6、在Qt中使用grpc
6.1、配置环境变量
grpc编译完后，在C:\Program Files (x86)\grpc目录下有编译好的grpc的应用程序、库文件、头文件。复制地址C:\Program Files (x86)\grpc\bin，将此地址添加到环境变量
打开cmd，输入protoc，回车，出现图中打印信息，表示配置成功
6.2、写.proto文件，生成cpp文件
新建文件helloworld.proto，输入如下内容
syntax = "proto3";package helloworld;// The greeting service definition.
service Greeter {// Sends a greetingrpc SayHello (HelloRequest) returns (HelloReply) {}
}// The request message containing the user's name.
message HelloRequest {string name = 1;
}// The response message containing the greetings
message HelloReply {string message = 1;
}
打开cmd，进入helloworld.proto文件所在目录，执行如下命令
protoc.exe ./helloworld.proto --cpp_out=./
protoc.exe ./helloworld.proto --plugin=protoc-gen-grpc="C:/Program Files (x86)/grpc/bin/grpc_cpp_plugin.exe" --grpc_out=./
生成如下四个pb文件
helloworld.pb.hhelloworld.pb.cchelloworld.grpc.pb.hhelloworld.grpc.pb.cc
6.3、客户端程序
在Qt中新建控制台程序GRpc_HelloWorld_Client，将pb文件添加到GRpc_HelloWorld_Client程序目录下
main.cpp
#include <QCoreApplication>#include <iostream>
#include <iostream>
#include <memory>
#include <string>
#include <grpcpp/grpcpp.h>
#include "helloworld.grpc.pb.h"using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using helloworld::Greeter;
using helloworld::HelloReply;
using helloworld::HelloRequest;class GreeterClient {public:GreeterClient(std::shared_ptr<Channel> channel): stub_(Greeter::NewStub(channel)) {}// Assembles the client's payload, sends it and presents the response back// from the server.std::string SayHello(const std::string& user) {// Data we are sending to the server.HelloRequest request;request.set_name(user);// Container for the data we expect from the server.HelloReply reply;// Context for the client. It could be used to convey extra information to// the server and/or tweak certain RPC behaviors.ClientContext context;// The actual RPC.Status status = stub_->SayHello(&context, request, &reply);// Act upon its status.if (status.ok()) {return reply.message();} else {std::cout << status.error_code() << ": " << status.error_message()<< std::endl;return "RPC failed";}}private:std::unique_ptr<Greeter::Stub> stub_;
};int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);GreeterClient greeter(grpc::CreateChannel("localhost:50051", grpc::InsecureChannelCredentials()));std::string user("world");std::string reply = greeter.SayHello(user);std::cout << "Greeter received: " << reply << std::endl;return a.exec();
}
6.4 服务端程序
在Qt中新建控制台程序GRpc_HelloWorld_Server，将pb文件添加到GRpc_HelloWorld_Server程序目录下
main.cpp
#include <QCoreApplication>
#include <iostream>
#include <memory>
#include <string>
#include <grpcpp/ext/proto_server_reflection_plugin.h>
#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#include "helloworld.grpc.pb.h"using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using helloworld::Greeter;
using helloworld::HelloReply;
using helloworld::HelloRequest;// Logic and data behind the server's behavior.
class GreeterServiceImpl final : public Greeter::Service {Status SayHello(ServerContext* context, const HelloRequest* request,HelloReply* reply) override {std::string prefix("Hello ");reply->set_message(prefix + request->name());return Status::OK;}
};void RunServer() {std::string server_address("0.0.0.0:50051");GreeterServiceImpl service;grpc::EnableDefaultHealthCheckService(true);grpc::reflection::InitProtoReflectionServerBuilderPlugin();ServerBuilder builder;// Listen on the given address without any authentication mechanism.builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());// Register "service" as the instance through which we'll communicate with// clients. In this case it corresponds to an *synchronous* service.builder.RegisterService(&service);// Finally assemble the server.std::unique_ptr<Server> server(builder.BuildAndStart());std::cout << "Server listening on " << server_address << std::endl;// Wait for the server to shutdown. Note that some other thread must be// responsible for shutting down the server for this call to ever return.server->Wait();
}int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);RunServer();return a.exec();
}
6.5 pro文件配置
GRpc_HelloWorld_Client.pro，GRpc_HelloWorld_Server.pro文件中添加如下内容
GRPC_HOME="C:/Program Files (x86)/grpc"INCLUDEPATH += $$GRPC_HOME/includeLIBS += -L$$GRPC_HOME/lib -lgrpc++ -lgrpc -lgpr -lgrpc_plugin_support -lgrpc_unsecure -lgrpc++_alts \
-lgrpc++_error_details -lgrpc++_reflection -lgrpc++_unsecure -lgrpcpp_channelz -laddress_sorting \
-lcares -labsl_bad_optional_access -labsl_bad_variant_access -labsl_civil_time \
-labsl_cord \
-labsl_exponential_biased \
-labsl_synchronization -labsl_graphcycles_internal -labsl_hash \
-labsl_city -labsl_hashtablez_sampler -labsl_log_severity \
-labsl_raw_hash_set \
-labsl_spinlock_wait -labsl_status -labsl_statusor -labsl_str_format_internal -labsl_symbolize \
-labsl_stacktrace \
-labsl_debugging_internal -labsl_demangle_internal -labsl_strings -labsl_strings_internal -labsl_malloc_internal \
-labsl_raw_logging_internal -labsl_throw_delegate -labsl_time -labsl_time_zone -labsl_int128 -labsl_base -lre2 \
-lupb -lprotobuf -llibprotoc -lzlib.dll -lssl -lcrypto -ldbghelpLIBS += -lWS2_32
LIBS += -lAdvapi32 -lbcryptDEFINES += _WIN32_WINNT=0x600注：如果编译出现以下错误，那就将对应的库连接删掉
6.6 编译运行
分别编译GRpc_HelloWorld_Client和GRpc_HelloWorld_Server。编译完成后，需要将C:\Program Files (x86)\grpc\bin目录下的libzlib.dll库copy到GRpc_HelloWorld_Client.exe和GRpc_HelloWorld_Server.exe所在目录下。
运行GRpc_HelloWorld_Server.exe
运行GRpc_HelloWorld_Client.exe
至此Windows下Qt使用grpc介绍完毕。
