Example

The following function allows you to configure your DCOM client settings. The settings in the function below are also used by our dOPC Explorer as the default setting.

Copy Code

uses
  ActiveX;

function CallSecurityInit: HResult;
const
  RPC_C_AUTHN_LEVEL_NONE = 1;
  RPC_C_IMP_LEVEL_IMPERSONATE = 3;
  EOAC_NONE = 0;
begin
  // this is for DCOM:
  // without this, callbacks from the server may get blocked, depending on
  // DCOM configuration settings
    result := CoInitializeSecurity(
    nil,                    // points to security descriptor
    -1,                     // count of entries in asAuthSvc
    nil,                    // array of names to register
    nil,                    // reserved for future use
    RPC_C_AUTHN_LEVEL_NONE, // the default authentication level for proxies
    RPC_C_IMP_LEVEL_IMPERSONATE,// the default impersonation level for proxies
    nil,                    // used only on Windows 2000
    EOAC_NONE,              // additional client or server-side capabilities
    nil                     // reserved for future use
    );
end;