Windows下安装lmdb报错

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尝试在Windows安装用paddleocr时，发现在环境配置中安装lmdb的过程中会报错：

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# 报错提示
Collecting lmdb
  Using cached lmdb-1.4.1.tar.gz (881 kB)
  Preparing metadata (setup.py) ... done
Building wheels for collected packages: lmdb
  Building wheel for lmdb (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> [15 lines of output]
      py-lmdb: Using bundled liblmdb with py-lmdb patches; override with LMDB_FORCE_SYSTEM=1 or LMDB_PURE=1.
      py-lmdb: Using CPython extension; override with LMDB_FORCE_CFFI=1.
      running bdist_wheel
      running build
      running build_py
      creating build\lib.win-amd64-cpython-312
      creating build\lib.win-amd64-cpython-312\lmdb
      copying lmdb\cffi.py -> build\lib.win-amd64-cpython-312\lmdb
      copying lmdb\tool.py -> build\lib.win-amd64-cpython-312\lmdb
      copying lmdb\_config.py -> build\lib.win-amd64-cpython-312\lmdb
      copying lmdb\__init__.py -> build\lib.win-amd64-cpython-312\lmdb
      copying lmdb\__main__.py -> build\lib.win-amd64-cpython-312\lmdb
      running build_ext
      building 'cpython' extension
      error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for lmdb
  Running setup.py clean for lmdb
Failed to build lmdb
ERROR: Could not build wheels for lmdb, which is required to install pyproject.toml-based projects

故在这里记录下解决问题的方法：

  • 下载Visual CPP build tools，下载并运行vs_BuildTools.exe。
  • 按照提示安装Visual Studio Installer，安装“Visual Studio生成工具”。
  • 安装完成后再点击“Visual Studio生成工具”的修改按钮，勾选“使用C++的桌面开发”，进行修改

此时即可正常安装lmdb。