I'm trying to use a DLL that I have used many times in other languages including C, Java, Perl, etc so I am pretty familiar with the library, but I didn't write it. It came from a comercial source.
I'm using ctyps to load the library as such:
from ctypes import *
piapi = windll.piapi32
findpoint = piapi.pipt_findpoint
findpoint
findpoint.restype = c_int
findpoint.argtypes = [c_char_p, c_int]
ptid = []
ptid.append(c_int())
retVal = c_int()
tag = create_string_buffer('\000' * 32)
ptid[0] = 0
tag.value = str(input("Enter a tag name:"))
retVal = piapi.pipt_findpoint(tag[0], ptid[0])
I have tried a number of different combinations on the arguments but all of them return a value of 2. The function should return 0 if successful, > 0 if the problem is with the data source and > 0 if the problem is a system problem.
So what system problem is "2"? Is there a listing of error codes to error messages in Python?
Thanks.
PS here's the header entry for the function: PIINT32 pipt_findpoint( char PIPTR *tagname, int32 PIPTR *pt );