Env- createConnection failed

Question

hello All,
please could you help me on this?
I'm trying to run a small c++ program using oracle occi.
i'm using visual c++ 7.1.
i have set the following in my vc++ environment:
include files:
c:\oracle\product\10.1.0\db_1\oci\include
library files:
c:\oracle\product\10.1.0\db_1\oci\MSVC\vc71
c:\oracle\product\10.1.0\db_1\oci\lib\MSVC
Executable files:
c:\oracle\product\10.1.0\db_1\bin
linker/input:
oraocci10.lib
my database is oracle9 and i'm using oracle 10lib files
the program compile and link fine:
but when i run it i receive the error :"unhandled exception at 0x612f89e9 in myproram.exe :0xC0000005: access violation reading location 0xcc006173"
the program stop in conn =env->createConnection ...
any help will be greatly appreciated

Answer 1

It's very simple!
There are many differences and normally you have only a chance, if you download the Patchset releases from the Metalink dictionary, because the basic and free downloadable versions have a lot of bugs. But for this process you have to be a registered customer. No chance for beginning developers and so they have not a good feeling to the Oracle software, because the first contact will be with strange difficult things. Not good to Oracle!
Ok, here the solution for your trouble:
You must create a Extension- or Standard-DLL in VC6 with the following content. The main problem ist with the Environment-object. And so we do it there, where it will be go.
By example:
__declspec( dllexport ) Environment* pEnv;
__declspec( dllexport ) Connection* pCon;
__declspec( dllexport ) void __cdecl OraConnect()
try
pEnv = Environment::createEnvironment( Environment::OBJECT );
RegisterClasses( pEnv );
pCon = pEnv->createConnection( "scott", "tiger", "" );
catch( SQLException &ex )
AfxMessageBox( ex.getMessage().c_str() );
__declspec( dllexport ) void __cdecl OraDisconnect()
try
pEnv->terminateConnection( pCon );
Environment::terminateEnvironment( pEnv );
catch( SQLException &ex )
AfxMessageBox( ex.getMessage().c_str() );
And by example in your VC7/7.1 Project you must import the declarations from above:
#include <occi.h>
#pragma comment(lib, "oraocci9.lib")
__declspec( dllimport ) oracle::occi::Environment* pEnv;
__declspec( dllimport ) oracle::occi::Connection* pCon;
__declspec( dllimport ) void OraConnect();
__declspec( dllimport ) void OraDisconnect();
And then you can do in VC7/VC7.1 with occi whatever you want!
If you need, I can make a complete sample with this unique cooperation to bypass this bug.
Many success
Robert
http://rarecase.xardas.lima-city.de/