[mongodb-user] 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
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[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

Post by 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
*mongocxx::uri uri("mongodb://myserver:27017");mongocxx::client
client(uri);*
* 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
*COUNTER(clients_active, "Clients", "Active",
"The number of active clients.")*
Any idea how to resolve this?
Thanks,
Alex
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[AlexB]

That was it! Thank you Andrew.
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