Python 3.10调用sharedvar.dll遇WinError 0xe0434352错误求助

我在Multicharts中使用SharedVar-a64.dll完全正常，但切换到Python 3.10调用时触发错误：

OSError: [WinError -532462766] Windows Error 0xe0434352

测试脚本 #

from ctypes import *
#                   DLL     ,           RETURN VALUE ,  FUCTION NAME,   PARAMS
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", int,    "svInit",      string;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", int,    "svGetInt",    int,string;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", bool,   "svSetValue",  int,string,double;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", bool,   "svGetBool",   int,string;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", string, "svGetString", int,string;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", double, "svGetDouble", int,string;
#DefineDLLFunc: "C:\Windows\SharedVar-a64.dll", bool,   "svSetString", int,string,string;

c_lib = "C:\\\\Windows\\\\SharedVar-a64.dll"
Symbol = "15"

lib = cdll.LoadLibrary(c_lib)
print(lib)
#load ok

lib.svInit.argtype = [c_wchar_p]
lib.svInit.restype = c_double

linkID = lib.svInit("15")

lib.svGetDouble.restype = c_int
lib.svGetDouble.argtype = [c_int, c_wchar_p]

ret = lib.svGetDouble(linkID, "PC")
print(ret)

报错信息 #

C:\Users\Gilles\PycharmProjects\pythonProject\sockets-python-master\venv\Scripts\python.exe "C:/Users/Gilles/PycharmProjects/pythonProject/sockets-python-master/test shared2.py"

<CDLL 'C:\Windows\SharedVar-a64.dll', handle 7ffa05b60000 at 0x1ac76f42e00>
Traceback (most recent call last):
  File "C:\Users\Gilles\PycharmProjects\pythonProject\sockets-python-master\test shared2.py", line 26, in <module>
    linkID = lib.svInit("15")
OSError: [WinError -532462766] Windows Error 0xe0434352

Process finished with exit code 1

修复步骤 #

1. 修正函数类型定义错误
   代码中多处函数签名与注释标注的DLL实际定义不符，这是引发错误的核心原因：

   • svInit返回值应为int，你错误设置为c_double，导致栈内存混乱
   • 参数类型注意是argtypes（复数形式）而非argtype，且多数Windows DLL默认使用ASCII字符串（c_char_p），而非宽字符（c_wchar_p）
   • svGetDouble返回值应为c_double，你错误设置为c_int

   修正后的关键代码：

   # 修正svInit的类型定义
   lib.svInit.argtypes = [c_char_p]
   lib.svInit.restype = c_int
   # 调用时传入字节串
   linkID = lib.svInit(b"15")
   
   # 修正svGetDouble的类型定义
   lib.svGetDouble.restype = c_double
   lib.svGetDouble.argtypes = [c_int, c_char_p]
   # 调用时传入字节串
   ret = lib.svGetDouble(linkID, b"PC")
   

2. 匹配调用约定
   当前用cdll.LoadLibrary对应C调用约定（cdecl），如果DLL实际是stdcall编译的，改用windll.LoadLibrary加载：

   lib = windll.LoadLibrary(c_lib)
   

3. 确认环境位数匹配
   确保使用64位Python，因为SharedVar-a64.dll是64位DLL，32位Python无法加载64位动态库。

内容的提问来源于stack exchange，提问作者gillou