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This is specific to using the Oracle 10 client with UnicodeEnvironment set to True.

With the newer ODAC releases (see note below) I receive:
exception class EOCIInitError with message 'Can't initialize OCI. Error -1'.

This occurs on the call:
Res := Home.OCI8.OCIEnvCreate(FhOCIEnv, InitMode, nil, nil, nil, nil, 0, nil);

The error occurs only when UnicodeEnvironment is true. The value of InitMode when I get the error is 4210691.

Note:
I believe this is an issue with the newer versions of ODAC as a compiled version of my software from early 2018 does not show the issue and initializes the Oracle 10 client in Unicode mode with no problems.

I am using Oracle Instant Client 10.1 (10.1.0.4.0) for this test.

Any help is appreciated. Thanks.

-Mark Ford

Thank you for the information. We will investigate the described issue and let you know the results shortly.

When working with the last Oracle version and using the UnicodeEnvironment option, try setting the False value to the OCINCharLiteralReplace variable before establishing a connection. Alternatively, try using an older version of Oracle Instant Client.