python - 无法运行libclang:错误“找不到指定的模块”

Question

遵循Eli's和glehmann's指南；
（在Windows中）
已从here安装llvm-3.8.0-win32
已安装libclang-py3包（0.3版）
将C:\Program Files (x86)\LLVM\bin\libclang.dll添加到我的路径环境变量
当我试图执行下面的代码时（摘自上面提到的指南）

clang.cindex.Config.set_library_path('C:\Program Files (x86)\LLVM\bin\libclang.dll')

def find_typerefs(node, typename):
    # Find all references to the type named 'typename'
    if node.kind.is_reference():
        ref_node = clang.cindex.Cursor_ref(node)
        if ref_node.spelling == typename:
            print('Found %s [line=%s, col=%s]' % (
                typename, node.location.line, node.location.column))
    # Recurse for children of this node
    for c in node.get_children():
        find_typerefs(c, typename)

index = clang.cindex.Index.create()
tu = index.parse(cppsource)
print('Translation unit:', tu.spelling)
find_typerefs(tu.cursor, 'Person')

我得到以下错误：

C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\python.exe C:/Users/Duca/Desktop/PyPlag/rough-scripts/c++_parser_with_libclang.py
Traceback (most recent call last):
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\site-packages\clang\cindex.py", line 3623, in get_cindex_library
    library = cdll.LoadLibrary(self.get_filename())
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\ctypes\__init__.py", line 425, in LoadLibrary
    return self._dlltype(name)
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\ctypes\__init__.py", line 347, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/Duca/Desktop/PyPlag/rough-scripts/c++_parser_with_libclang.py", line 49, in <module>
    index = clang.cindex.Index.create()
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\site-packages\clang\cindex.py", line 2238, in create
    return Index(conf.lib.clang_createIndex(excludeDecls, 0))
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\site-packages\clang\cindex.py", line 141, in __get__
    value = self.wrapped(instance)
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\site-packages\clang\cindex.py", line 3592, in lib
    lib = self.get_cindex_library()
  File "C:\Users\Duca\AppData\Local\Programs\Python\Python35-32\lib\site-packages\clang\cindex.py", line 3628, in get_cindex_library
    raise LibclangError(msg)
clang.cindex.LibclangError: [WinError 126] The specified module could not be found. To provide a path to libclang use Config.set_library_path() or Config.set_library_file().

Process finished with exit code 1

也试过了，
从 here下载了cfe-3.8.0.src.tar，并在我的脚本目录中复制了 clang.cindex模块
安装了llvm-3.8.0-win64并更新了path环境变量和 clang.cindex.Config.set_library_path语句（在读取此 question之后）
将 libclang.dll从安装目录复制到python dlls目录
使用 clang.cindex.Config.set_library_path('C:\Program Files (x86)\LLVM\bin')和 clang.cindex.Config.set_library_file('C:\Program Files (x86)\LLVM\bin\libclang.dll')和 clang.cindex.Config.set_library_file('C:\Program Files (x86)\LLVM\bin')
没有成功。

Answer 1

恐怕你代码中的罪魁祸首是反斜杠。您需要将clang.cindex.Config.set_library_path('C:\Program Files (x86)\LLVM\bin\libclang.dll')更改为clang.cindex.Config.set_library_file('C:/Program Files (x86)/LLVM/bin/libclang.dll')。
另外，我相信这是更好的编程实践，您可以使用os.sep来处理Windows和Linux路径分隔的情况。
另外，代码中还有一个问题；即，您需要将ref_node = clang.cindex.Cursor_ref(node)更改为ref_node = node.get_definition()，以避免获得AttributeError，因为Cursor_ref不再是clang.cindex模块的属性。
在修复上述参数后，运行参数simple_demo_src.cpp Person您应该不会出错，看到这个输出：

Translation unit: simple_demo_src.cpp
Found Person [line=7, col=21]
Found Person [line=13, col=5]
Found Person [line=24, col=5]
Found Person [line=24, col=21]
Found Person [line=25, col=9]

这正是伊莱在他的 page中提到的。