WindowsError：加载ctypes DLL时出错[126]

问题描述

在Windows 7上使用Python 2.7可以正常工作：

This works fine on Windows 7 with Python 2.7:

lib = ctypes.cdll.LoadLibrary('prov_means')
provmeans = lib.provmeans

库prov_means.DLL在我的工作目录中。它导出一个简单的，独立的C函数provmeans（），没有依赖关系。

The library prov_means.DLL is in my working directory. It exports a simple, stand-alone C function provmeans() with no dependencies.

当我在Windows XP和Python 2.7上尝试相同的事情时，我得到

When I try the same thing on Windows XP and Python 2.7 I get

Traceback (most recent call last):
  File "D:\python\Auxil\src\auxil.py", line 130, in <module>
    lib = ctypes.cdll.LoadLibrary('prov_means')
  File "C:\Python27\lib\ctypes\__init__.py", line 431, in LoadLibrary
    return self._dlltype(name)
  File "C:\Python27\lib\ctypes\__init__.py", line 353, in __init__
    self._handle = _dlopen(self._name, mode)
WindowsError: [Error 126] The specified module could not be found

我尝试过将DLL复制到Windows \System32并输入完整路径名称

I have tried copying the DLL to Windows\System32 and also entering the full path name

"d:\\python\\auxil\\src\\prov_means"

带有和不含.DLL延期。没有什么工作。

with and without the ".DLL" extension. Nothing works.

推荐答案

错误126是在找不到依赖DLL时所得到的。这有两个明显的原因：

Error 126 is what you get when a dependent DLL can not be found. There are two obvious causes for this:

1. 您的DLL未找到。


2. 您的DLL取决于找不到的其他DLL。

我怀疑选项1是问题，但在任何情况下，我想我可能会使用一个完整的路径，该DLL可以肯定。

I doubt that option 1 is the problem but in any case I think I would probably be using a full path to that DLL to be sure.

所以，留下选项2和最常见的原因那就是你的目标机器没有安装C ++运行时。在目标机器上安装C ++运行时，或使用静态链接，，构建DLL时，不需要重新分发运行时。

So that leaves option 2 and the most common cause for that is that your target machine does not have the C++ runtime installed. Either install the C++ runtime on your target machine, or use static linking, /MT, when building your DLL so that you do not need to redistribute the runtime.

可能是在您开发了DLL的机器，您已经安装了一个C ++编译器，并为您安装了运行时。在目标机器上，代码失败，您尚未安装编译器，因此运行时不存在。

Probably, on the machine that you developed the DLL, you have installed a C++ compiler and that installed the runtime for you. On your target machine, where the code fails, you have not installed the compiler and so the runtime is not present.

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