How to get the current path of the open PDF File using Acrobat Plugin (C++)

When i click the plugin i want to get the path of the open PDF document (Full Path Like "C:\Users\Vignesh\Downloads\sdk110_v1_win\Adobe\Acrobat XI SDK\Version 1\Documentation\U3DElements.pdf"). I have read mostly all the SDK Document to get this done but I end up Empty.

I can do the same in the js by using the code
var path = this.path.split('"/');
app.alert(path);

Please Some Help Me Through...