-compiled and installed successfully mongo-cxx-driver (mongo db c++ driver - 26Compat - all test ok passed). directory /usr, so /usrmongo/client/dbclient.h exists.
-running cmd:
g++ tutorial.cpp -pthread -lmongoclient -lboost_thread-mt -lboost_system -lboost_regex -lboost_filesystem -lboost_program_options -o tutorial
-file tutorial.cpp
#include <cstdlib>
#include <iostream>
#include "mongo/client/dbclient.h" // for the driver
void run() {
mongo::DBClientConnection c;
c.connect("localhost");
}
int main() {
mongo::client::initialize();
try {
run();
std::cout << "connected ok" << std::endl;
} catch( const mongo::DBException &e ) {
std::cout << "caught " << e.what() << std::endl;
}
return EXIT_SUCCESS;
}
results - error:
tutorial.cpp: In function ‘int main()’:
tutorial.cpp:11:12: error: ‘mongo::client’ has not been declared
any hint?
Not sure this helps but I got a similar error after installing the mongo-dev package using apt-get. This should not be done after mongo 2.6; it only works up to mongo 2.4 or something. It ended up corrupting my 2.6, so I had to clean up everything, reinstall mongo and then build mongo-cxx-driver from the github repo https://github.com/mongodb/mongo-cxx-driver according to their instructions.
Afterward eclipse still gave an error for the tutorial, but strangely it did build the thing. I had to clean up both Debug and Release there and ended up with only a warning, because the includes were messed up. So finally I just scrapped the eclipse project, copied the tutorial file to a new project and now it builds clean.
Related
Im trying to check if sdl is properly installed on my Ubuntu 20.04 and its not.
Running all on 64bit type.
This is my code:
#include <iostream>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
bool initSDL()
{
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
{
std::cout << "Failed to init sdl: " << SDL_GetError() << std::endl;
return false;
}
if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG)
{
std::cout << "Failed to init sdl_image: " << IMG_GetError() << std::endl;
return false;
}
return true;
}
int main(int argc, char *argv[])
{
std::cout << "Code Starting..." << std::endl;
initSDL();
int winX = 900, winY = 600;
std::cout << "Code Exited Properly." << std::endl;
return 0;
}
And this is my output:
Code Starting...
Failed to init sdl: No available video device
Code Exited Properly.
Im running my code with this commands:
gcc -c src/*.cpp -I include -m64 -lstdc++ -std=c++11
gcc *.o -o out/main -lSDL2main -lSDL2 -lSDL2_image -m64 -lstdc++ -std=c++11
./out/main
My code strucure is this way:
Main directory 'sdl_hello_world'
->src -> contains 'main.cpp'
->out -> contains compiled 'main'
Some methods i tried was:
export DISPLAY=:0
export SDL_VIDEODRIVER=x11
So how do i fix this ?
EDIT: I also followed this tutorial (https://www.youtube.com/watch?v=P3_xhDIP7bc&list=PLvv0ScY6vfd-p1gSnbQhY7vMe2rng0IL0&ab_channel=MikeShah), and still it gave the same error. So i guess the problem is in some computer setting.
EDIT: SOLVED:
i followed almost all tutorials and fix methods on the internet to solve my issue which uses gcc in linux. Some solutions on stack overflow seemed to prefer to compile the source code on their own computer WHICH WORKED.
So im pretty sure the way ubuntu installs it on my computer/ idk im new to using sdl. Updating this as might come handy to anyone else.
Still curious, is there a chance i did something wrong, or could this be considered a bug ?
EDIT: followed this btw https://wiki.libsdl.org/Installation
I am currently trying to get a working tls websocket client running in C++ (which is a pain in the ass) and I have tried CPP Rest SDK as well as Websocket++. Both spit out a bunch of compile errors (see below). When I tried compiling it using Websocket++ without tls, it compiles so the error clearly is related to SSL.
I tried different OpenSSL versions (1.0.1, 1.0.2, 1.1.0), different C++ versions (11, 14 and even 17), and I just can't get it to compile.
I googled and none of the solutions worked. I am on Ubuntu 16 and the build command I am using looks like this:
g++ source/* -o test.out -Iinclude/ -std=c++14 -L/lib64 -lcurl -lboost_system -lssl -lcrypto -l pthread
Here are some of the errors:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp: In constructor ‘boost::asio::ssl::detail::openssl_init_base::do_init::do_init()’:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:43:23: error: expected id-expression before ‘(’ token
mutexes_.resize(::CRYPTO_num_locks());
/usr/include/boost/asio/ssl/detail/impl/engine.ipp:221:9: error: ‘SSL_R_SHORT_READ’ was not declared in this scope
ERR_PACK(ERR_LIB_SSL, 0, SSL_R_SHORT_READ),
And here is the basic source code:
#include <websocketpp/config/asio_client.hpp>
#include <websocketpp/client.hpp>
#include <iostream>
// pull out the type of messages sent by our config
typedef websocketpp::config::asio_tls_client::message_type::ptr message_ptr;
typedef websocketpp::client<websocketpp::config::asio_tls_client> client;
using websocketpp::lib::placeholders::_1;
using websocketpp::lib::placeholders::_2;
using websocketpp::lib::bind;
void on_close(client* c, websocketpp::connection_hdl hdl) {
c->get_alog().write(websocketpp::log::alevel::app, "Connection Closed");
}
int main(int argc, char* argv[]) {
client c;
std::string uri = "wss://gateway.discord.gg/";
if (argc == 2) {
uri = argv[1];
}
try {
// set logging policy if needed
c.clear_access_channels(websocketpp::log::alevel::frame_header);
c.clear_access_channels(websocketpp::log::alevel::frame_payload);
//c.set_error_channels(websocketpp::log::elevel::none);
// Initialize ASIO
c.init_asio();
// Register our handlers
c.set_open_handler(bind(&on_open,&c,::_1));
c.set_fail_handler(bind(&on_fail,&c,::_1));
c.set_message_handler(bind(&on_message,&c,::_1,::_2));
c.set_close_handler(bind(&on_close,&c,::_1));
// Create a connection to the given URI and queue it for connection once
// the event loop starts
websocketpp::lib::error_code ec;
client::connection_ptr con = c.get_connection(uri, ec);
c.connect(con);
// Start the ASIO io_service run loop
c.run();
} catch (const std::exception & e) {
std::cout << e.what() << std::endl;
} catch (websocketpp::lib::error_code e) {
std::cout << e.message() << std::endl;
} catch (...) {
std::cout << "other exception" << std::endl;
}
}
This was a long time ago but in case it helps, adding -lcrypto -lssl in the g++ cmd arguments solved the problem for me.
I'm learning cpp-netlib and I tried running the exmaple client given on the official website. The code is very simple:
#include <boost/network/protocol/http/client.hpp>
#include <iostream>
int main(int argc, char *argv[]) {
using namespace boost::network;
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " [url]" << std::endl;
return 1;
}
http::client client;
http::client::request request(argv[1]);
request << header("Connection", "close");
http::client::response response = client.get(request);
std::cout << body(response) << std::endl;
return 0;
}
And here is my makefile for this c++ application:
CC = g++ -std=c++11
CFLAG = -I/usr/local/Cellar/boost/1.57.0/include
LIBFLAG = -L/usr/local/Cellar/boost/1.57.0/lib
all: client
client: client.o
$(CC) $(LIBFLAG) -lboost_system -lboost_thread client.o -o client
client.o: client.cpp
$(CC) -c $(CFLAG) client.cpp
clean:
rm -rf *.o client
It complains about not finding lboost_thread library after compilation:
ld: library not found for -lboost_thread
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [client] Error 1
In my boost library directory, the boost_thread library shows up like this:
libboost_thread-mt.a libboost_thread-mt.dylib
Why isn't it able to find this library? Did I make any mistake in the linking?
Try changing your makefile to link to -lboost-thread-mt instead of -lboost-thread.
You seems to be missing libboost_thread for some reason
I have installed boost and cpp-netlib and successfully ran all tests. I can compile the following example from the command line with the following options:
clang++ -o test main.cpp \
-I/path.../cpp-netlib-0.11.1-final \
-I/path.../boost_1_57_0 \
-L/path.../boost_1_57_0/stage/lib \
-L/usr/local/lib \
-lboost_system \
-lboost_thread \
-lcppnetlib-uri \
-lcppnetlib-client-connections \
-lssl \
-lcrypto \
-pthread
Example from cpp-netlib.org:
#include <boost/network/protocol/http/client.hpp>
#include <iostream>
int main(int argc, char *argv[]) {
using namespace boost::network;
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " [url]" << std::endl;
return 1;
}
http::client client;
http::client::request request(argv[1]);
request << header("Connection", "close");
http::client::response response = client.get(request);
std::cout << body(response) << std::endl;
return 0;
}
Running this program:
./test "url"
Successfully displays the html code of website.
I am running into a problem when I try to import this example into Xcode. I have included the correct search paths for header files and binaries. The code will compile but Xcode crashes every time it reaches this line.
http::client::request request(argv[1]);
I can comment out this line and everything after it and the program compiles and runs. Otherwise it crashes, even when trying to use a breakpoint. Any suggestions would be appreciated.
This is because of the URI parser generating really big symbols in debug builds. The use of Boost.Spirit in the URI parsing uses very heavy template metaprogramming and that shows up as very long symbols which may not be handled appropriately by the system. I'm not sure whether there are work-arounds here as I don't use the Xcode IDE for regular development of cpp-netlib.
I am running Ubuntu 14.04, and using Eclipse CDT.
In my program, I am trying to initialize SDL and if it doesn't initialize then output the error, but SDL_GetError() returns "Failed to connect to the Mir Server". I am sure SDL is installed correctly since I can successfully initialize SDL on another project.
These are the libraries I am using: http://i.imgur.com/SS1mjzQ.png
#include <SDL2/SDL.h>
#include <iostream>
int main(int argc, char* args[]) {
if(SDL_Init(SDL_INIT_EVERYTHING) < 0) {
std::cout << SDL_GetError() << std::endl;
}
return 0;
}
bash$ export DISPLAY=:0
Setting the DISPLAY run time environment variable fixes it for me — typical X Windows lossage, fails to default to your local display (designed for remote displays) which you'd only know if you'd gone to X11 summer camp.
A complete working example in bash:
(cd /tmp && g++ -xc++ - -lSDL2 && (DISPLAY=:0 ./a.out; echo \$? = $?)) <<.
#include <SDL2/SDL.h>
#include <iostream>
int main() {
if(SDL_Init(SDL_INIT_EVERYTHING) < 0) {
std::cout << SDL_GetError() << std::endl;
return 1;
}
return 0;
}
.
$? = 0
Does the environment you are running on have a windowing system?
This error has come up for me when I'm running tests initializing SDL2 on Travis CI using Ubuntu 14.04. Based on what I've been able to gather from further testing and hints I've gotten from google searches SDL_Init when initializing SDL if it is passed SDL_INIT_VIDEO (which you are doing implicitly with SDL_INIT_EVERYTHING), it will try and connect with the windowing system of your machine.
So perhaps try:
SDL_Init(0)
and then initialize the other subsystems later with:
SDL_InitSubSystem(SDL_INIT_EVERYTHING)
If you do keep in mind that you must quit every subsystem you initialize in this case it's just technically. You would do that like this:
SDL_QuitSubSystem(SDL_INIT_EVERYTHING)
I had this error when I was using gcc to compile.
When I used g++ to compile it fixes the issue. The Lazy Foo tutorial also recommends you to use g++ to compile.
If you are having this problem you can try using g++ to compile and see if this resolves the issue.