How to build QT with GRPC

wei chi

here is my .pro file

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = basler_opt_3
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

INCLUDEPATH += /usr/local/lib \
               /usr/local/bin

#/opt/pylon5/include
# /usr/local/include/opencv3 \
LIBS += `pkg-config opencv --libs`
LIBS += -L/opt/pylon5/lib64 -Wl,-E -lpylonbase -lpylonutility -lGenApi_gcc_v3_1_Basler_pylon -lGCBase_gcc_v3_1_Basler_pylon
#LIBS += `opt/pylon5/bin/pylon-config --libs`
LIBS += -L/usr/local/lib -lgrpc++ -lgrpc -lgpr -lz -lprotobuf -lgrpc++_reflection -ldl
 #`pkg-config grpc grpc++ protobuf --libs)`
CONFIG += console
QMAKE_CXXFLAGS+= -I/opt/pylon5/include
#QMAKE_CXXFLAGS+= -I/usr/include/opencv

#$(shell /opt/pylon5/bin/pylon-config --cflags) \
   #              $(shell pkg-config --cflags opencv)

QMAKE_LFLAGS+= $(shell /opt/pylon5/bin/pylon-config --libs-rpath)

SOURCES += \
        main.cpp \
        mainwindow.cpp \
    rs232.cpp \
    optrs232.cpp \
    secdialog.cpp \
    imagethread.cpp \
    settingdialog.cpp \
    helloworld.pb.cc \
    helloworld.grpc.pb.cc \
    grpcserver.cpp \
    grpcthread.cpp

HEADERS += \
        mainwindow.h \
    rs232.h \
    optrs232.h \
    global.h \
    BaslerHeader.h \
    baslercam.h \
    secdialog.h \
    imagethread.h \
    settingdialog.h \
    helloworld.pb.h \
    helloworld.grpc.pb.h \
    grpcserver.h \
    grpcthread.h


FORMS += \
        mainwindow.ui \
    secdialog.ui \
    settingdialog.ui

RESOURCES += \
    resource.qrc

Here is the error i am confuse.
!
Absolutely, I am no idea how to solve this, hope someone can help me.
Thanks

SGaist

Hi and welcome to devnet,

Where does SearchService come from ?

INCLUDEPATH's content looks wrong as you are passing folders containing dlls and binaries.

Your LIB content is likely also wrong.

qmake already provides support for pkg-config. You should check the documentation.

By the way, a .pro file is not a bash script so your call to pkg-config does not do what your think it does.

wei chi

Thank for your reply.
However, I do not understand clearly.
I am working on ubuntu.
My .proto file is below.
Therefore, I get four files helloworld.grpc.pb.cc, helloworld.grpc.pb.h, helloworld.pb.cc, and helloworld.pb.h from the .proto file.

syntax = "proto3";
 
	message SearchRequest
	{
		uint32 ImgRows_req=1;
		uint32 ImgCols_req =2;
		bytes ImgData_req=3;
		uint32 ImgType_req=4;
		uint32 ImgSize_req=5;
        string Commands=6;
		string Msg_req=7;
		uint32 Image_Index=8;

	}
 
	message SearchResponse
	{
		
		uint32 ImgRows_rsp= 1;
		uint32 ImgCols_rsp =2;
		bytes ImgData_rsp=3;
		uint32 ImgType_rsp=4;
		uint32 ImgSize_rsp=5;
        string ErrorMsg_rsp=6;
        string Msg_rsp=7;
		uint32 Threshold_rsp=8;


	}
 
	service SearchService {
  		rpc Search (SearchRequest) returns (SearchResponse);
    }

SearchService is come from helloworld.grpc.pb.cc.
I inlcude helloworld.grpc.pb.h in my grpcserver.h.
However, error "SearchService has not been declared" is still exist.

// Generated by the gRPC C++ plugin.
// If you make any local change, they will be lost.
// source: helloworld.proto

#include "helloworld.pb.h"
#include "helloworld.grpc.pb.h"

#include <functional>
#include <grpcpp/impl/codegen/async_stream.h>
#include <grpcpp/impl/codegen/async_unary_call.h>
#include <grpcpp/impl/codegen/channel_interface.h>
#include <grpcpp/impl/codegen/client_unary_call.h>
#include <grpcpp/impl/codegen/client_callback.h>
#include <grpcpp/impl/codegen/method_handler_impl.h>
#include <grpcpp/impl/codegen/rpc_service_method.h>
#include <grpcpp/impl/codegen/server_callback.h>
#include <grpcpp/impl/codegen/service_type.h>
#include <grpcpp/impl/codegen/sync_stream.h>

static const char* SearchService_method_names[] = {
  "/SearchService/Search",
};

std::unique_ptr< SearchService::Stub> SearchService::NewStub(const std::shared_ptr< ::grpc::ChannelInterface>& channel, const ::grpc::StubOptions& options) {
  (void)options;
  std::unique_ptr< SearchService::Stub> stub(new SearchService::Stub(channel));
  return stub;
}

SearchService::Stub::Stub(const std::shared_ptr< ::grpc::ChannelInterface>& channel)
  : channel_(channel), rpcmethod_Search_(SearchService_method_names[0], ::grpc::internal::RpcMethod::NORMAL_RPC, channel)
  {}

::grpc::Status SearchService::Stub::Search(::grpc::ClientContext* context, const ::SearchRequest& request, ::SearchResponse* response) {
  return ::grpc::internal::BlockingUnaryCall(channel_.get(), rpcmethod_Search_, context, request, response);
}

void SearchService::Stub::experimental_async::Search(::grpc::ClientContext* context, const ::SearchRequest* request, ::SearchResponse* response, std::function<void(::grpc::Status)> f) {
  ::grpc::internal::CallbackUnaryCall(stub_->channel_.get(), stub_->rpcmethod_Search_, context, request, response, std::move(f));
}

void SearchService::Stub::experimental_async::Search(::grpc::ClientContext* context, const ::grpc::ByteBuffer* request, ::SearchResponse* response, std::function<void(::grpc::Status)> f) {
  ::grpc::internal::CallbackUnaryCall(stub_->channel_.get(), stub_->rpcmethod_Search_, context, request, response, std::move(f));
}

void SearchService::Stub::experimental_async::Search(::grpc::ClientContext* context, const ::SearchRequest* request, ::SearchResponse* response, ::grpc::experimental::ClientUnaryReactor* reactor) {
  ::grpc::internal::ClientCallbackUnaryFactory::Create(stub_->channel_.get(), stub_->rpcmethod_Search_, context, request, response, reactor);
}

void SearchService::Stub::experimental_async::Search(::grpc::ClientContext* context, const ::grpc::ByteBuffer* request, ::SearchResponse* response, ::grpc::experimental::ClientUnaryReactor* reactor) {
  ::grpc::internal::ClientCallbackUnaryFactory::Create(stub_->channel_.get(), stub_->rpcmethod_Search_, context, request, response, reactor);
}

::grpc::ClientAsyncResponseReader< ::SearchResponse>* SearchService::Stub::AsyncSearchRaw(::grpc::ClientContext* context, const ::SearchRequest& request, ::grpc::CompletionQueue* cq) {
  return ::grpc::internal::ClientAsyncResponseReaderFactory< ::SearchResponse>::Create(channel_.get(), cq, rpcmethod_Search_, context, request, true);
}

::grpc::ClientAsyncResponseReader< ::SearchResponse>* SearchService::Stub::PrepareAsyncSearchRaw(::grpc::ClientContext* context, const ::SearchRequest& request, ::grpc::CompletionQueue* cq) {
  return ::grpc::internal::ClientAsyncResponseReaderFactory< ::SearchResponse>::Create(channel_.get(), cq, rpcmethod_Search_, context, request, false);
}

SearchService::Service::Service() {
  AddMethod(new ::grpc::internal::RpcServiceMethod(
      SearchService_method_names[0],
      ::grpc::internal::RpcMethod::NORMAL_RPC,
      new ::grpc::internal::RpcMethodHandler< SearchService::Service, ::SearchRequest, ::SearchResponse>(
          std::mem_fn(&SearchService::Service::Search), this)));
}

SearchService::Service::~Service() {
}

::grpc::Status SearchService::Service::Search(::grpc::ServerContext* context, const ::SearchRequest* request, ::SearchResponse* response) {
  (void) context;
  (void) request;
  (void) response;
  return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
}

INCLUDEPATH is where the header files are. like. grpc pylon
And LIBS is where the .so files are. like the grpc .so -L/usr/local/lib -lgrpc++ -lgrpc -lgpr -lz -lprotobuf -lgrpc++_reflection -ldl
Did I miss anything?
I appreciate your kind assistance.

SGaist

What version of protoc are you using ?

semlanik

Hi, this https://github.com/semlanik/qtprotobuf might be useful for you