Using python to pull Mx, vx, nx for all elements

SOFiSTiK
1

Hello

I have received some code to access the .cdb and pull node numbers and coordinates.
I know that it is then possible to pull mx, my, vx, vy, ny, nx for each element.
My question is; what command should i use, and where can i find it? i looked in the cdbase manual, but cannot find anything that resembles the CNODE and CQUAD commands used in my current code.
Does anyone know??

Index = c_int()
cdbIndex = 99

fileName = r"C:\python_test\T4_trappevæg_trafik\T4_trappevag_SLS_trafik_revA.cdb"
Index.value = myDLL.sof_cdb_init(fileName.encode(‘utf-8’), cdbIndex)

cdbStat = c_int()
cdbStat.value = myDLL.sof_cdb_status(Index.value)

pos = c_int(0)
datalen = c_int(0)

a = c_int()
ie = c_int(0)

datalen.value = sizeof(CNODE) I am searching for the command CNODE used here
RecLen = c_int(sizeof(cnode))

NodeNum =
IntNodeNum =
X_Coor =
Y_Coor =
Z_Coor =

while ie.value < 2:
ie.value = py_sof_cdb_get(Index, 20, 0, byref(cnode), byref(RecLen), 1)
NodeNum.append(cnode.m_nr)
IntNodeNum.append(cnode.m_inr)
X_Coor.append(round(cnode.m_xyz[0],3)) # x coordinates
Y_Coor.append(round(cnode.m_xyz[1],3)) # y coordinates
Z_Coor.append(round(cnode.m_xyz[2],3)) # z coordinates

Data = {‘NodeNum’: NodeNum, ‘IntNodeNum’ : IntNodeNum, ‘X_Coor’: X_Coor, ‘Y_Coor’: Y_Coor, ‘Z_Coor’: Z_Coor
}

myDLL.sof_cdb_close(0)
cdbStat.value = myDLL.sof_cdb_status(Index.value)
#if cdbStat.value == 0:
# print(“CDB closed successfully, status = 0”)

print(pd.DataFrame(Data))

2

I got it working. I realized that i have to specify the entry ID, and also the sub number, so instead of
ie.value = py_sof_cdb_get(Index, 210, 0, byref(cquad_foc), byref(RecLen), 1)
it is supposed to be:
ie.value = py_sof_cdb_get(Index, 210, 1, byref(cquad_foc), byref(RecLen), 1)

But how can i get the dataframe to have both the corresponding quad element and LC?

The working code:

import os               # for the environment variable necessary, this is a great tool
import platform         # checks the python platform
import pandas as pd
import string
# import ipywidgets as widgets


from sofistik_daten import *
from Sofistik_Func import *
from ctypes import *    # read the functions from the cdb
import math


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

path = os.environ["Path"]

# 64bit DLLs
dllPath = r"C:\Program Files\SOFiSTiK\2023\SOFiSTiK 2023\interfaces\64bit"
dllPath += ";"

# other necessary DLLs
dllPath += r"C:\Program Files\SOFiSTiK\2023\SOFiSTiK 2023"
os.environ["Path"] = dllPath + ";" + path

# Get the DLL functions
myDLL = cdll.LoadLibrary(r"C:\Program Files\SOFiSTiK\2023\SOFiSTiK 2023\interfaces\64bit\sof_cdb_w-2023.dll")
py_sof_cdb_get = cdll.LoadLibrary("sof_cdb_w-2023.dll").sof_cdb_get
py_sof_cdb_get.restype = c_int

py_sof_cdb_kenq = cdll.LoadLibrary("sof_cdb_w-2023.dll").sof_cdb_kenq_ex 
#End Region
############################
Index = c_int()
cdbIndex = 99

fileName = r"C:\python_test\T4_trappevæg_trafik\T4_trappevag_SLS_trafik_revA.cdb"
Index.value = myDLL.sof_cdb_init(fileName.encode('utf-8'), cdbIndex)

cdbStat = c_int()
cdbStat.value = myDLL.sof_cdb_status(Index.value)

pos = c_int(0)
datalen = c_int(0)

a = c_int()
ie = c_int(0)

datalen.value = sizeof(CQUAD_FOR)
RecLen = c_float(sizeof(cquad_for))

Elem_nr = []
mxx = []
myy = [] 
ny = []


print({'Ie value is': ie.value})



while ie.value < 2:
    ie.value = py_sof_cdb_get(Index, 210, 1, byref(cquad_for), byref(RecLen), 1)
    mxx.append(cquad_for.m_mxx)
    myy.append(cquad_for.m_myy)
    ny.append(cquad_for.m_ny)
    
print({'Ie value is': ie.value})

mxx = mxx[2:]
myy = myy[2:] 
ny = ny[2:]   

Data3 = {'mxx': mxx , 'myy': myy , 'ny': ny} 
print(pd.DataFrame(Data3))

    

myDLL.sof_cdb_close(0)
cdbStat.value = myDLL.sof_cdb_status(Index.value)
1 Like