Strings and client call replies

[EvyEh]

Hello again,

I am having issues with the client getting results from the server. The function it is calling is an std::string function, and my reply call looks like this:

reply=logClient.call("getMessage", command+" "+level).as<std::string>();

on the server side, the method is bound like so:
serv.bind("getMessage", getMessage);

When trying to build this, I get build errors.
object_fwd.hpp(66): error C2039: 'value': is not a member of 'clmdep_msgpack::v1::type'
note: see reference to class template instantiation 'clmdep_msgpack::v1::has_as<T>' being compiled 1> with 1> [ 1> T=std::string 1> ]

Clearly, I'm doing something wrong, but I'm not really sure what.

[sztomi]

Can you paste the declaration of the getMessage function?

[EvyEh]

std::string getMessage(std::string message)

[EvyEh]

I have also tried the call as std::string reply(logClient.call("getMessage", sendLog(client_id, message, level)).as<std::string>());
based off the echo_client.cc example, and that caused the same errors.

[sztomi]

ok, so it is your client that you can't compile, right? Could you post your code, compiler version and complete compiler output?

[EvyEh]

Client code
`// ThalmicClient.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "..\ClientLib\Clientlib.h"

int main() {
std::string command = "";
std::string client_id;
std::string reply;
rpc::client logClient("127.0.0.1", 8080);
std::cout << "Please Enter client id: "<<std::endl;
std::cin >> client_id;

while (true) {
	std::cout << "Enter command:"<<std::endl;
	std::cin >> command;

	if (command == "?") {
		std::cout << "Valid commands are:\nsend <level (info, warning, or error)> <message to be logged>, sends message to log\ndump <level (info, warning, or error)>, outputs log with level specifying minimum level to dump\nclear, clears log\nquit, exits client\n";
	}
	else if (command == "send") {
		std::string level;
		std::string message;
		std::cin >> level;
		std::getline(std::cin, message);
		reply = logClient.call("getMessage", sendLog(client_id, message, level)).as<std::string>();
		
		
	}
	else if (command == "dump") {
		std::string level;
		std::cin >> level;
		if (level == "info" || level == "warning" || level == "error") {
			std::string totalLog = "";
			reply=logClient.call("getMessage", command+" "+level).as<std::string>();
		}
		else {
			std::cout << "Invalid level specified"<<std::endl;
		}

	}
	else if (command == "clear") {
		reply=logClient.call("getMessage", command).as<std::string>();
	}
	else if (command == "quit") {
		break;
	}
	else {
		std::cout << "Invalid command. To see a list of valid commands, enter ?\n";
	}
}

return 0;

}`

client header
`#pragma once

#include "targetver.h"

#include <stdio.h>
#include <tchar.h>
#include
#include
#include <rpc\client.h>`

Client library
`#include "stdafx.h"

std::string sendLog(std::string client_id,std::string Message, std::string level) {
std::string totalMessage = client_id + " " + level + " " + Message;
return totalMessage;

}`

I'm not sure how to check the compiler version, but I'm using Visual Studio 2017 Community, and I think it might be 14.12.25827. The unknown compiler version messages are an artifact from a small bug in Boost.

Complete compiler output:
1>------ Rebuild All started: Project: ClientLib, Configuration: Debug Win32 ------ 2>------ Rebuild All started: Project: Serverlib, Configuration: Debug Win32 ------ 1>stdafx.cpp 2>stdafx.cpp 2>Unknown compiler version - please run the configure tests and report the results 1>Clientlib.cpp 1>ClientLib.vcxproj -> C:\Users\Er\source\repos\ThalmicLogger\Debug\ClientLib.lib 3>------ Rebuild All started: Project: ThalmicClient, Configuration: Debug Win32 ------ 3>stdafx.cpp 2>Serverlib.cpp 2>c:\users\er\source\repos\thalmiclogger\serverlib\serverlib.cpp(17): warning C4018: '<': signed/unsigned mismatch 2>Serverlib.vcxproj -> C:\Users\Er\source\repos\ThalmicLogger\Debug\Serverlib.lib 2>Done building project "Serverlib.vcxproj". 4>------ Rebuild All started: Project: ThalmicServer, Configuration: Debug Win32 ------ 4>stdafx.cpp 4>Unknown compiler version - please run the configure tests and report the results 3>ThalmicClient.cpp 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(66): error C2039: 'value': is not a member of 'clmdep_msgpack::v1::type' 3>c:\users\er\rpclib\include\rpc\msgpack\v1\adaptor\detail\cpp11_define_map.hpp(22): note: see declaration of 'clmdep_msgpack::v1::type' 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(97): note: see reference to class template instantiation 'clmdep_msgpack::v1::has_as<T>' being compiled 3> with 3> [ 3> T=std::string 3> ] 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object.hpp(121): note: see reference to class template instantiation 'clmdep_msgpack::v2::has_as<T>' being compiled 3> with 3> [ 3> T=std::string 3> ] 3>c:\users\er\source\repos\thalmiclogger\thalmicclient\thalmicclient.cpp(30): note: see reference to function template instantiation 'T clmdep_msgpack::v1::object_handle::as<std::string>(void)' being compiled 3> with 3> [ 3> T=std::string 3> ] 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(66): error C2065: 'value': undeclared identifier 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(66): error C2131: expression did not evaluate to a constant 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(66): note: failure was caused by non-constant arguments or reference to a non-constant symbol 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(66): note: see usage of 'value' 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(98): error C2039: 'value': is not a member of 'clmdep_msgpack::v2::type' 3>c:\users\er\rpclib\include\rpc\msgpack\v2\adaptor\detail\cpp11_define_map_decl.hpp(19): note: see declaration of 'clmdep_msgpack::v2::type' 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(98): error C2065: 'value': undeclared identifier 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(98): error C2131: expression did not evaluate to a constant 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(98): note: failure was caused by non-constant arguments or reference to a non-constant symbol 3>c:\users\er\rpclib\include\rpc\msgpack\v2\object_fwd.hpp(98): note: see usage of 'value' 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object.hpp(121): warning C4305: 'specialization': truncation from 'const bool *' to 'bool' 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object.hpp(121): error C2672: 'clmdep_msgpack::v1::object::as': no matching overloaded function found 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object.hpp(121): error C2770: invalid explicit template argument(s) for 'std::enable_if<clmdep_msgpack::v2::has_as<T>::value,T>::type clmdep_msgpack::v1::object::as(void) const' 3>c:\users\er\rpclib\include\rpc\msgpack\v1\object_fwd.hpp(121): note: see declaration of 'clmdep_msgpack::v1::object::as' 4>ThalmicServer.cpp 3>Done building project "ThalmicClient.vcxproj" -- FAILED. 4>ThalmicServer.vcxproj -> C:\Users\Er\source\repos\ThalmicLogger\Debug\ThalmicServer.exe 5>------ Rebuild All started: Project: UnitTests, Configuration: Debug Win32 ------ 5>stdafx.cpp 5>unittest1.cpp 5>Unknown compiler version - please run the configure tests and report the results 5> Creating library C:\Users\Er\source\repos\ThalmicLogger\Debug\UnitTests.lib and object C:\Users\Er\source\repos\ThalmicLogger\Debug\UnitTests.exp 5>UnitTests.vcxproj -> C:\Users\Er\source\repos\ThalmicLogger\Debug\UnitTests.dll ========== Rebuild All: 4 succeeded, 1 failed, 0 skipped ==========

[alternativelook]

Hello, I am getting the exact same errors.
I am using VS2017 v141, compiler version is 19.12.25830.2
I only get these errors when I want a result from a call() with .as<T>()
For example: std::string result = c.call("echo", input).as<std::string>();

[anti-matter]

Any update on this issue? I cannot use .as() for any type. I get the compiler error "error C2440: 'return': cannot convert from 'wchar_t *' to 'wchar_t *&'" for every type I attempt to return. Anyone find a workaround?

Update:
Here is code that won't compile:

    auto result =_rpcClient->async_call(func_remove_window, processId, reinterpret_cast<UINT_PTR>(hWnd));
    auto hr = result.get().as<HRESULT>();

...with error code: error C2039: 'value': is not a member of 'clmdep_msgpack::v1::type'

[sztomi]

I believe this might be related to the msgpack upgrade. Could you try v2.1.1 in your environment? (that's the version before the bundled msgpack was updated).

[anti-matter]

Thanks, I built 2.1.1 and pointed my project at it. Now I cannot compile anything:

rror C2440: 'return': cannot convert from 'clmdep_msgpack::v1::object_handle' to 'clmdep_msgpack::v1::object_handle'

It complains mostly about missing copy constructors.

[sztomi]

You probably need to clear out your previous build and make sure that you are using both the headers and libs for that version.

[anti-matter]

I figured it out! I went back to v2.2.1 and stepped through the example compiler config and compared each one with my project settings. It turns out that under Compiler->Language I had "Conformance mode" set to "Yes (/permissive-)". Once I set that to "No", it all compiled and worked fine.