How to add a erroe window?

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 07/03/2011 at 19:21, xxxxxxxx wrote:

Hi all
I come from China, and I can not find a man who study python for Cinema 4D around me.
so,I guess there is the only place which I can be helped.
I hope you can understand what I said:)

And there is my plugin:

###############################################################
import c4d
from c4d import gui

def main() :
doc.StartUndo()
objList = doc.GetActiveObjects(childs=True)
for obj in objList:
doc.AddUndo(c4d.UNDOTYPE_CHANGE,obj)
obj.SetRelPos(c4d.Vector(0,0,0))
obj.SetRelRot(c4d.Vector(0,0,0))
c4d.EventAdd()
doc.EndUndo()

if __name__=='__main__':
main()

#######################################################################

the plugin let the object back to (0,0,0) #position and rotation
but, I just want add a message window when none object have be selected, and the sys will show the window with some words(just like :"please select a object frist!") to users.

But, I don`t know how to add it !!!

So, I hope you can help me.

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 08/03/2011 at 02:32, xxxxxxxx wrote:

Hi
it's from gui, >> gui.MessageDialog

  
import c4d   
from c4d import gui   
  
def main() :   
 doc.StartUndo()  
 objList = doc.GetActiveObjects(childs=True)  
 if objList:   
  for obj in objList:   
doc.AddUndo(c4d.UNDOTYPE_CHANGE,obj)  
obj.SetRelPos(c4d.Vector(0,0,0))  
obj.SetRelRot(c4d.Vector(0,0,0))  
 else:  
  gui.MessageDialog("Please select me!!!")  
 c4d.EventAdd()   
 doc.EndUndo()   
if __name__=='__main__':   
 main()

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 08/03/2011 at 02:42, xxxxxxxx wrote:

thinks:)
you are so kind!!!

And I think I should study python more hard than before

Have a nice day:)

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 08/03/2011 at 05:03, xxxxxxxx wrote:

Studieng the Documentation would be more senseful.

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 08/03/2011 at 05:15, xxxxxxxx wrote:

thanks a lot

you are good people ~