C # - DLLImport values ​​and default functions

Question

I interact with a native third-party C ++ DLL through C #, and the provided interaction layer is as follows:

WITH#:

[DllImport("csvcomm.dll")]
public static extern int CSVC_ValidateCertificate(byte[] certDER, int length);

C ++:

CSVC_Status_t CSVCOMM_API CSVC_ValidateCertificate(BYTE* certDER, DWORD length, 
    DWORD context = CONTEXT_DEFAULT);

Note. There are only two parameters in the extern C # definition, since the C ++ function provides a default value for the third parameter. It's right? I got some non-deterministic results when using the provided definition, but when I added the third parameter, as shown below, it works correctly every time, and not sporadically.

[DllImport("csvcomm.dll")]
public static extern int CSVC_ValidateCertificate(byte[] certDER, int length, 
    int context);

Any ideas? Will adding a third parameter really fix this problem?

Answer 1

++ . P/Invoke, .

, # , ( # 4). ++ .