重置QGIS实现
This commit is contained in:
wzy-warehouse
@@ -5,13 +5,12 @@ QGIS 环境检测与子进程配置模块。
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所有 QGIS 操作通过 subprocess 调用 QGIS Python 3.12 执行。
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本模块提供：
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- get_qgis_python_path(): 检测 QGIS Python 3.12 解释器路径
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- build_qgis_command(): 构建通过 .bat 启动 QGIS 子进程的命令
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- is_qgis_available(): 检查 QGIS 是否可用
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- get_runner_script(): 获取 qgis_runner.py 的路径
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- get_qgis_python_path(): 检测 QGIS Python 3.12 解释器路径
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- build_qgis_subprocess_env(): 构建子进程完整环境变量（替代 bat 包装器）
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- is_qgis_available(): 检查 QGIS 是否可用
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- get_runner_script(): 获取 qgis_runner.py 的路径
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"""
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import os
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import tempfile
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from pathlib import Path
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from app.config.paths import get_logger
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@@ -72,31 +71,96 @@ def get_qgis_python_path(qgis_root: str = None) -> str | None:
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return None
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def build_qgis_command(qgis_root: str = None) -> list[str]:
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def build_qgis_subprocess_env(qgis_root: str = None) -> dict:
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"""
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构建通过 .bat 包装器启动 QGIS 子进程的命令列表。
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设置环境变量并启动 QGIS Python 3.12。
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构建 QGIS Python 3.12 子进程的完整环境变量（替代 bat 包装器）。
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策略：
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1. 从 os.environ 继承，移除 venv 污染（PYTHONPATH/VIRTUAL_ENV 等）
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2. 将 QGIS 的 bin 目录前置到 PATH（Qt5→qgis→gdal 顺序，与原 bat 一致）
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3. 设置 PYTHONPATH / QGIS_PREFIX_PATH / QT_PLUGIN_PATH / GDAL_DATA / PROJ_DATA
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4. 子进程 _setup_environment() 负责 os.add_dll_directory + ctypes 预加载
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"""
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import platform
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if platform.system() != "Windows":
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python_path = get_qgis_python_path(qgis_root)
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if not python_path:
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raise RuntimeError("未找到 QGIS Python 解释器")
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return [python_path, get_runner_script()]
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# 继承当前环境，清理 venv 污染
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env = dict(os.environ)
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venv_root = env.get("VIRTUAL_ENV", "").lower()
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for key in (
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"PYTHONPATH",
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"PYTHONHOME",
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"VIRTUAL_ENV",
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"PYTHONDONTWRITEBYTECODE",
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):
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env.pop(key, None)
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if venv_root:
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path_parts = env.get("PATH", "").split(";")
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clean = []
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for p in path_parts:
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if not p or venv_root in p.lower():
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continue
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clean.append(p)
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env["PATH"] = ";".join(clean)
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# 检测 QGIS 安装路径
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if qgis_root is None:
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qgis_root = _detect_qgis_root() or "D:/QGIS"
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python_path = get_qgis_python_path(qgis_root)
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if not python_path:
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raise RuntimeError("未找到 QGIS Python 3.12 解释器")
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env["QGIS_ROOT"] = qgis_root
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runner_script = get_runner_script()
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if not os.path.isfile(runner_script):
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raise RuntimeError(f"QGIS Runner 脚本不存在: {runner_script}")
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if platform.system() != "Windows":
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return env
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bat_path = _generate_bat_wrapper(qgis_root, python_path, runner_script)
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return ["cmd.exe", "/c", bat_path]
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qgis_app_dir = os.path.join(qgis_root, "apps", "qgis-ltr")
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if not os.path.isdir(qgis_app_dir):
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qgis_app_dir = os.path.join(qgis_root, "apps", "qgis")
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if not os.path.isdir(qgis_app_dir):
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raise RuntimeError(
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f"未找到 QGIS 应用目录: {qgis_root}\\apps\\qgis-ltr 或 qgis"
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)
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# 前置 QGIS bin 目录到 PATH（Qt5 必须在最前面，QGIS 依赖它）
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qgis_bin = os.path.join(qgis_app_dir, "bin")
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qt5_bin = os.path.join(qgis_root, "apps", "Qt5", "bin")
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gdal_lib = os.path.join(qgis_root, "apps", "gdal", "lib")
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qt5_plugins = os.path.join(qgis_root, "apps", "Qt5", "plugins")
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qtplugins = os.path.join(qgis_app_dir, "qtplugins")
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qgis_python_dir = os.path.join(qgis_app_dir, "python")
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env["PATH"] = f"{qt5_bin};{qgis_bin};{gdal_lib};{env.get('PATH', '')}"
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# QGIS 核心环境变量（与 bat 包装器保持一致）
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env["PYTHONPATH"] = qgis_python_dir
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env["QGIS_PREFIX_PATH"] = qgis_app_dir
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env["QT_PLUGIN_PATH"] = f"{qtplugins};{qt5_plugins}"
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# GDAL / PROJ 数据目录（避免系统旧版 proj.db 干扰）
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gdal_data = os.path.join(qgis_root, "apps", "gdal", "share", "gdal")
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if os.path.isdir(gdal_data):
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env["GDAL_DATA"] = gdal_data
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for pd in (
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os.path.join(qgis_app_dir, "share", "proj"),
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os.path.join(qgis_root, "share", "proj"),
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os.path.join(qgis_root, "apps", "gdal", "share", "proj"),
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):
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if os.path.isfile(os.path.join(pd, "proj.db")):
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env["PROJ_DATA"] = pd
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break
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# UTF-8 / GDAL 编码辅助变量
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env["PYTHONUTF8"] = "1"
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env["GDAL_FILENAME_IS_UTF8"] = "YES"
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env["VSI_CACHE"] = "TRUE"
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env["VSI_CACHE_SIZE"] = "1000000"
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logger.debug(
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f"QGIS subprocess env built: root={qgis_root}, app={qgis_app_dir}, "
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f"PATH prefixed with qgis_bin/qt5_bin/gdal_lib"
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)
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return env
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def is_qgis_available(qgis_root: str = None) -> bool:
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@@ -109,60 +173,6 @@ def get_runner_script() -> str:
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return str(Path(__file__).parent / "qgis_runner.py")
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def _generate_bat_wrapper(qgis_root: str, python_path: str, runner_script: str) -> str:
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"""生成 .bat 包装脚本，设置 QGIS 环境变量并启动 runner"""
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# 自动检测 QGIS 应用目录（qgis-ltr 或 qgis）
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qgis_app_dir = os.path.join(qgis_root, "apps", "qgis-ltr")
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if not os.path.isdir(qgis_app_dir):
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qgis_app_dir = os.path.join(qgis_root, "apps", "qgis")
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qgis_app_dir = qgis_app_dir.replace("/", "\\")
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# 自动检测 PROJ 目录
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proj_data = ""
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for pd in [
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os.path.join(qgis_app_dir, "share", "proj"),
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os.path.join(qgis_root, "share", "proj"),
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os.path.join(qgis_root, "apps", "gdal", "share", "proj"),
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]:
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if os.path.isfile(os.path.join(pd, "proj.db")):
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proj_data = pd.replace("/", "\\")
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break
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python_dir = os.path.join(qgis_root, "apps", "Python312").replace("/", "\\")
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qt5_plugins = os.path.join(qgis_root, "apps", "Qt5", "plugins").replace("/", "\\")
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qtplugins = os.path.join(qgis_app_dir, "qtplugins").replace("/", "\\")
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gdal_data = os.path.join(qgis_root, "apps", "gdal", "share", "gdal").replace("/", "\\")
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qgis_python_dir = os.path.join(qgis_app_dir, "python").replace("/", "\\")
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qgis_bin = os.path.join(qgis_app_dir, "bin").replace("/", "\\")
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qt5_bin = os.path.join(qgis_root, "apps", "Qt5", "bin").replace("/", "\\")
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gdal_lib = os.path.join(qgis_root, "apps", "gdal", "lib").replace("/", "\\")
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proj_line = f'set "PROJ_DATA={proj_data}"' if proj_data else "REM PROJ_DATA not found"
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bat_content = f"""@echo off
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chcp 65001 >nul
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set "PYTHONPATH={qgis_python_dir}"
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set "QGIS_PREFIX_PATH={qgis_app_dir}"
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set "QT_PLUGIN_PATH={qtplugins};{qt5_plugins}"
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set "GDAL_DATA={gdal_data}"
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{proj_line}
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set "PYTHONUTF8=1"
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set "GDAL_FILENAME_IS_UTF8=YES"
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set "VSI_CACHE=TRUE"
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set "VSI_CACHE_SIZE=1000000"
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set "PATH={qt5_bin};{qgis_bin};{gdal_lib};%PATH%"
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"{python_path}" "{runner_script}" %*
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"""
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bat_dir = os.path.join(tempfile.gettempdir(), "qgis_runner")
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os.makedirs(bat_dir, exist_ok=True)
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bat_path = os.path.join(bat_dir, "run_qgis.bat")
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with open(bat_path, "w", encoding="utf-8") as f:
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f.write(bat_content)
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logger.debug(f"生成 QGIS 包装脚本: {bat_path}")
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return bat_path
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def _detect_qgis_root() -> str | None:
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"""
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自动检测 QGIS 安装根目录。
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@@ -23,12 +23,23 @@ import sys
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import time
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# ============================================================
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# 1. 环境初始化（必须在任何 QGIS/Qt import 之前）
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# 环境初始化（必须在任何 QGIS/Qt import 之前）
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# ============================================================
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QGIS_ROOT = os.environ.get("QGIS_ROOT", "D:/QGIS")
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def _detect_qgis_app_dir():
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"""自动检测 QGIS 应用目录（qgis-ltr 或 qgis）"""
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for name in ("qgis-ltr", "qgis"):
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d = os.path.join(QGIS_ROOT, "apps", name)
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if os.path.isdir(d):
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return d
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raise RuntimeError(
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f"未找到 QGIS 应用目录: {QGIS_ROOT}\\apps\\qgis-ltr 或 qgis"
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)
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def _setup_python_path():
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"""将项目根目录和 QGIS Python 路径加入 sys.path"""
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project_root = os.path.dirname(
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@@ -37,59 +48,44 @@ def _setup_python_path():
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if project_root not in sys.path:
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sys.path.insert(0, project_root)
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qgis_python = os.path.join(QGIS_ROOT, "apps", "qgis-ltr", "python")
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qgis_app_dir = _detect_qgis_app_dir()
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qgis_python = os.path.join(qgis_app_dir, "python")
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if os.path.isdir(qgis_python) and qgis_python not in sys.path:
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sys.path.insert(0, qgis_python)
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def _setup_environment():
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"""设置 QGIS 运行所需的环境变量"""
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# 自动检测 QGIS 应用目录（与 run_qgis.bat 保持一致）
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qgis_app_dir = os.path.join(QGIS_ROOT, "apps", "qgis-ltr")
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if not os.path.isdir(qgis_app_dir):
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qgis_app_dir = os.path.join(QGIS_ROOT, "apps", "qgis")
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"""设置 QGIS 运行所需的环境变量和 DLL 搜索路径。
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# ★ 必须在任何 DLL 加载前设置 PROJ_DATA，防止 PostgreSQL 的旧 proj.db 干扰
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for proj_dir in [
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os.path.join(qgis_app_dir, "share", "proj"),
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os.path.join(QGIS_ROOT, "share", "proj"),
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os.path.join(QGIS_ROOT, "apps", "gdal", "share", "proj"),
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]:
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if os.path.isdir(proj_dir):
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os.environ["PROJ_DATA"] = proj_dir
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break
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os.environ["QGIS_PREFIX_PATH"] = qgis_app_dir
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QGIS_PREFIX_PATH / QT_PLUGIN_PATH / GDAL_DATA / PROJ_DATA
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已由主进程通过 build_qgis_subprocess_env() 设置，子进程不重复设。
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这里注册 DLL 搜索目录并预加载核心 DLL 以确保正确加载顺序。
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"""
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os.environ["PYTHONUTF8"] = "1"
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os.environ["GDAL_FILENAME_IS_UTF8"] = "YES"
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os.environ["VSI_CACHE"] = "TRUE"
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os.environ["VSI_CACHE_SIZE"] = "1000000"
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if sys.platform == "win32":
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os.environ["QT_PLUGIN_PATH"] = (
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f"{os.path.join(qgis_app_dir, 'qtplugins')};"
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f"{os.path.join(QGIS_ROOT, 'apps', 'Qt5', 'plugins')}"
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)
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gdal_data = os.path.join(QGIS_ROOT, "apps", "gdal", "share", "gdal")
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if os.path.isdir(gdal_data):
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os.environ["GDAL_DATA"] = gdal_data
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import ctypes
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_dll_dirs = [
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qgis_app_dir = _detect_qgis_app_dir()
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dll_dirs = [
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os.path.join(qgis_app_dir, "bin"),
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os.path.join(QGIS_ROOT, "apps", "Qt5", "bin"),
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os.path.join(QGIS_ROOT, "apps", "gdal", "lib"),
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]
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for dll_dir in dll_dirs:
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if os.path.isdir(dll_dir):
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os.add_dll_directory(dll_dir)
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# 预加载核心 DLL —— 强制从 QGIS 目录加载，防止系统 PATH 中同名 DLL 干扰
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_preload_dlls = [
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"qgis_core.dll", "qgispython.dll",
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"Qt5Core.dll", "Qt5Gui.dll", "Qt5Widgets.dll",
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"Qt5Network.dll", "Qt5Svg.dll", "Qt5Xml.dll",
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"Qt5Concurrent.dll", "Qt5PrintSupport.dll",
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]
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for dll_dir in _dll_dirs:
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if not os.path.isdir(dll_dir):
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continue
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os.add_dll_directory(dll_dir)
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for dll_dir in dll_dirs:
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for dll_name in _preload_dlls:
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dll_path = os.path.join(dll_dir, dll_name)
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if os.path.isfile(dll_path):
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@@ -100,14 +96,14 @@ def _setup_environment():
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# ============================================================
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# 2. 主逻辑
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# 主逻辑
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# ============================================================
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def _init_qgis():
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"""初始化 QgsApplication（只做一次）"""
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from qgis.core import QgsApplication
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qgis_app_dir = os.path.join(QGIS_ROOT, "apps", "qgis-ltr")
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qgis_app_dir = _detect_qgis_app_dir()
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QgsApplication.setPrefixPath(qgis_app_dir, True)
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qgs_app = QgsApplication([], False)
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qgs_app.initQgis()
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