CODEWITHSUNDEEP
c++windowsmongodbdriver
Andrew Colin
Andrew Colin

Reputation: 93

Getting started with MongoDB C++ driver in Windows

Trying to set up a simple MongoDB database connection in Windows 7, using the C++ driver. I'm using Visual C++ compiler 19 for x86, 32-bit MongoDB 3.0.6, Boost 1_59_0, Mongo legacy 1.0.5 C++ driver.

Driver compiles OK using the command

scons --cpppath=d:\boost_1_59_0 --libpath=d:\boost_1_59_0\stage\lib --msvc-host-arch=x86 install

Program is

#include <cstdlib>
#include <iostream>

using namespace std;
#include <WinSock2.h>
#include <windows.h>

#include "mongo/client/dbclient.h"

void run() {
  mongo::DBClientConnection c;
  c.connect("localhost");
}

int main() {
  try {
    run();
    std::cout << "connected ok" << std::endl;
  } catch( const mongo::DBException &e ) {
    std::cout << "caught " << e.what() << std::endl;
  }
  return EXIT_SUCCESS;
}

Program compiles using 

cl /EHsc /I"c:\mongo-cxx-driver-legacy-1.0.5\build\install\include" /I"d:\boost_1_59_0" /DSTATIC_LIBMONGOCLIENT mdb.cpp c:\mongo-cxx-driver-legacy-1.0.5\build\install\lib\libmongoclient-s.lib /link /LIBPATH:"D:\boost_1_59_0\stage\lib" ws2_32.lib

But when I run the program, get the error message

caught can't connect couldn't initialize connection to localhost, address is invalid

The server is running OK as I can access it through the shell, add records etc.

This is my first time programming MongoDB and I'm kind of stuck. Any suggestions?

Upvotes: 2

Views: 2207

Answers (1)

Andrew Colin
Andrew Colin

Reputation: 93

OK, problem solved (thanks to stevepowell.ca/mongo-db-1.html). Here's the answer for anyone else who runs into this problem:

Windows needs to initialize the client before setting up the connection.

#include <cstdlib>
#include <iostream>
#include <WinSock2.h>
#include <windows.h>
#include <memory>

#include "mongo/client/dbclient.h"

using namespace mongo;
using namespace std;

void run() {
  mongo::client::initialize(); // this line is new
  mongo::DBClientConnection c;
  c.connect("localhost");
}

int main() {
  try {
    run();
    std::cout << "connected ok" << std::endl;
  } catch( const mongo::DBException &e ) {
    std::cout << "caught " << e.what() << std::endl;
  }
  return EXIT_SUCCESS;
}

I wish this had been in the tutorial!

Onwards and upwards.

Upvotes: 2

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