Access violation exception in C++ driver

[AlexB]

Hello,

Just started working with MongoDB.

I have compiled C++ driver using cxx-driver-r3.0.2, mongo-c-driver-1.4.2 and boost_1_62_0.

My environment: Windows 10 Pro, Visual Studio 2015 Pro. The driver is compiled for the x64 platform w/o any issues.

But I can't even connect to the database, it crashes on the second statement here (in bold):

mongocxx::uri uri("mongodb://myserver:27017");
mongocxx::client client(uri);

Here is the call stack:

  libmongoc-1.0.dll!mongoc_counter_clients_active_add(__int64 val) Line 42 C
  libmongoc-1.0.dll!mongoc_counter_clients_active_inc() Line 42 C
  libmongoc-1.0.dll!_mongoc_client_new_from_uri(const _mongoc_uri_t * uri, _mongoc_topology_t * topology) Line 776 C
  libmongoc-1.0.dll!mongoc_client_new_from_uri(const _mongoc_uri_t * uri) Line 700 C
  mongocxx.dll!00007ffda5e10aa4() Unknown
  MyMongo.exe!main(int argc, char * * argv) Line 32 C++
  [External Code] 

The exact line of code where the exception is thrown (mongoc-counters.defs):

COUNTER(clients_active,         "Clients",      "Active",              "The number of active clients.")

Any idea how to resolve this?

Thanks,

Alex

[Andrew Morrow]

Hi -

Did you create a mongocxx::instance object? You must do so before using any of the other types in the library, and you must keep the instance object alive until you are done using the driver. See 

https://github.com/mongodb/mongo-cxx-driver/blob/8d083652095230cab6071ddf62a1103eb95f6530/examples/mongocxx/instance_management.cpp

For one example of how to do this.

Thanks,

Andrew

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[AlexB]

That was it! Thank you Andrew.