How to evaluate CXType_ConstantArray 's value

I need to parse some class method like this.

// virtual void setchar(const char* name = “xxxxxxxxx”) = 0;

but I have no idea about how to get the default value of name?

my code like this

{
    const CXType ctype = clang_getCursorType(cursor);
    // virtual void setchar(const char* name = "xxxxxxxxx") = 0;
    if (ctype.kind == CXType_ConstantArray) {
        const auto dataType = clang_getElementType(ctype);
        if (dataType.kind == CXType_Char_S) {
            // TODO
        }
        return;
    }

I was blocked by the TODO, any guys can help ? thanks a lot.