On 06/26/14 06:05, Shuai Meng wrote:

> In wine source code, NULL is defined as 0 in
> file dlls/windowscodecs/ungif.h, line 66. I have tried to write like this:
> 1260     if(V_VT(arg) == VT_NULL) {
> 1261         V_VT(res) = VT_NULL;
> 1262         V_NULL(res) = NULL;
> 1263     }

Hint: there already is return_null helper.

Jacek