Question

EDIT: Dear Future Readers, the std::string had nothing to do with the problem. It was an unterminated array.

In a nutshell, the problem is that adding a declaration of a single std::string to a program that otherwise contains only C causes the error “Access violation reading location 0xfffffffffffffffe.”

In the code below, if the line where the std::string is declared is commented out, the program runs to completion without error. If the line however is left in the program (uncommented), the program crashes with the above stated Acess Violation error. When I open the running program in the VS2010 debugger, the Access Violation has occurred at the call to ldap_search_sA().

Notice that the declared std::string is never used. It doesn’t have to be used for it to cause the access violation. Simply declaring it will cause the Access Violation.

My suspicion is it has nothing to do with the LDAP code, but I could be wrong.

int main() 
{
    try {
        // Uncommenting the next line causes an Access Violation 
        // at the call to ldap_search_sA().
        // std::string s;
        LDAP* pLdapConnection = ldap_initA("eu.scor.local", LDAP_PORT);
        ULONG version = LDAP_VERSION3;
        ldap_set_option(pLdapConnection, LDAP_OPT_PROTOCOL_VERSION, (void*) &version);         
        ldap_connect(pLdapConnection, NULL);
        ldap_bind_sA(pLdapConnection, NULL, NULL, LDAP_AUTH_NTLM);
        LDAPMessage* pSearchResult;
        PCHAR pMyAttributes[2];
        pMyAttributes[0] = "cn";
        pMyAttributes[1] = "description";
        ldap_search_sA(pLdapConnection, "dc=eu,dc=scor,dc=local", LDAP_SCOPE_SUBTREE,  "objectClass=computer)", pMyAttributes, 0, &pSearchResult);    
    } catch (...) {
        printf("exception\n");
    }
    return 0;
}

Answer 1

    PCHAR pMyAttributes[2];
    pMyAttributes[0] = "cn";
    pMyAttributes[1] = "description";

Attribute array should be NULL-terminated:

    PCHAR pMyAttributes[3];
    pMyAttributes[0] = "cn";
    pMyAttributes[1] = "description";
    pMyAttributes[2] = NULL;