openseespy 缺少 .dll文件如tcl86t.dll

目的：从openseespy官网下载了一个

1. Elastic Truss Analysis

案列，想测试一下

运行环境：

python   3.8.16

openseespy             3.3.0.1.1
openseespywin          3.3.0.1

问题：在运行时，出现报错如下

Traceback (most recent call last):
  File "C:\ProgramData\Miniconda3\envs\lib\site-packages\openseespy\opensees\__init__.py", line 19, in <module>
    from openseespywin.opensees import *
  File "C:\ProgramData\Miniconda3\envs\lib\site-packages\openseespywin\__init__.py", line 17, in <module>
    ctypes.cdll.LoadLibrary(dll_path + '\\tcl86t.dll')
  File "C:\ProgramData\Miniconda3\envs\lib\ctypes\__init__.py", line 451, in LoadLibrary
    return self._dlltype(name)
  File "C:\ProgramData\Miniconda3\envs\lib\ctypes\__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'C:\ProgramData\Miniconda3\envs\DLLs\tcl86t.dll' (or one of its dependencies). Try using the full path with constructor syntax.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/ElasticTruss.py", line 1, in <module>
    from openseespy.opensees import *
  File "C:\ProgramData\Miniconda3\envs\lib\site-packages\openseespy\opensees\__init__.py", line 22, in <module>
    raise RuntimeError('Failed to import openseespy on Windows.')
RuntimeError: Failed to import openseespy on Windows.

可以发现，报错是由于openseespy未找到tcl86t.dll文件导致，接而提示无法在windows 导入openseespy。

解决方法：在当前环境中，运行如下代码，可以查找到本地环境中的tcl86t.dll.

from ctypes.util import find_library
theDll = find_library('TCL86T')
print(theDll)

方法一：将查找到的本地.dll文件拷贝到报错代码中提示的文件夹，博主这里是C:\ProgramData\Miniconda3\envs\DLLs

方法二：将本地.dll文件的路径添加到系统环境变量。

当然，查找缺少的.dll文件都可以通过上述代码，不局限于tcl86t.dll。

参考资料：Fail to start · Issue #63 · zhuminjie/OpenSeesPyDoc · GitHub