Finding Lat & Long in dxf file

[mar_b6707]

Hi Dear friends

I am a VC programmer and I need to draw a dxf map file in a DC in my program.

furthermore I must get all latitudes and longtitudes from map and draw the map in center of special lat and long.

but As I see the lat and long are saved in dxf file in text entity.so I don't have any special format to recognize which text is lat & long of 4 corner of map.

so please help me,is there any way that when I read the entities of map,I can find real lat o long of 4 corners?or does it have any special format?

you do me a great favor if you help me.