ANR - Accessing Null Reference

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This Audit Is Temporary Disabled - Do not delete this topic

Description

ANR detects cases where evaluation of a field reference expression will result in an exception being thrown. ANR is reported whenever a non-static field of an object or array is accessed and the left operand of the . or -> (member access) operator has the null value.

Depending on the detected problem, the ANR audit can generate two messages:

• Call of method '%s' is via null pointer '%s'
• Access to field '%s' is via null pointer '%s'

Incorrect:

void PrintMessage(Message* msg) {
    if (msg) {
        msg->Print();
    } else {
        printf("Message %s is null",msg->ToString());
    }
}

Correct:

void PrintMessage(Message* msg) {
    if (msg) {
        msg->Print();
    } else {
        printf("Message is null");
    }
}

See Also

• C++ Audits Configuration dialog box
• C++ Audits pane
• Running C++ Audits
• Source Code Audits and Metrics