I deleted my question because I thought that i misunderstand too big.
I am get customproperty using GetCustomProperty on ISwDMApplication.
CString name = propName;
hr = swDoc->GetCustomProperty(name.AllocSysString(), &type, &vrRetA);
So i can get property value in vrRetA.
But. this value is Value / Text expression's of solidworks file property. I want to get evaluate value.
for ex) i am getting SW-Mass@103.SLDPRT. But i want to get "139.0"
I think i have to use CustomPropertyManager. i found using this by vb. but it is difficult that write c++ to me.
waitting your help.