在Ubuntu 18.04下为QGis 3.14.16安装protobuf == 3.13.0

问题描述

运行QGis 3.14.16我想打开一个使用protobuf的个人插件。在Windows下，我具有protobuf == 3.13.0并且可以工作。在Linux下，它没有说插件需要3.13.0，而QGis有3.0.0。

然后如何为QGis安装protobuf 3.0.0？

我在Python控制台中尝试过：

use ndarray::{Axis,Array}; // 0.13.1
use rand::seq::SliceRandom; // 0.7.3
use std::iter::FromIterator;

fn main() {
    let array = Array::from_iter(0..15).into_shape((5,3)).unwrap();
    println!("Before shuffling rows:\n{}",array);
    
    let mut permutation: Vec<usize> = (0..array.nrows()).collect();
    permutation.shuffle(&mut rand::thread_rng());
    
    for i in permutation.iter() {
        let row = array.index_axis(Axis(0),*i);
        println!("Row number {} is {}!",i,row);
    }
}

，它显示import pkg_resources installed_packages = pkg_resources.working_set installed_packages_list = sorted(["%s==%s" % (i.key,i.version) for i in installed_packages]) print(installed_packages_list)。奇怪。

我尝试过

protobuf==3.13.0

但是我仍然得到QGis找到3.0.0的消息窗口。

还是有一种方法可以将python虚拟环境用于QGis？

您可以通过在新目录protobuf_tester中创建三个文件轻松地将其检出

import pip
pip.main(["install","protobuf==3.13.0"])

- Windows: C:\Users\USERNAME\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\protobuf_tester - Linux: /lhome/USERNAME/.local/share/QGIS/QGIS3/profiles/default/python/plugins/protobuf_tester

__init__.py

# -*- coding: utf-8 -*- from .protobuf_tester import ProtobufTester def classFactory(iface): return ProtobufTester(iface)

Metadata.txt

# This file contains Metadata for your plugin. Since # version 2.0 of QGIS this is the proper way to supply # @R_393_4045@ion about a plugin. The old method of # embedding Metadata in __init__.py will # is no longer supported since version 2.0. # This file should be included when you package your plugin.# Mandatory items: [general] name=ProtobufTester qgisMinimumVersion=3.0 description=Tries to import the protobuf modules version=0.1 author=Roland about=Since it prints results to the python console,please open the python console first via the extension menu. In case of an google protobuf-error you'll get a message window,in case of success you don't. # Tags are comma separated with spaces allowed tags=python,protobuf,qgis experimental=True # deprecated flag (applies to the whole plugin,not just a single version) deprecated=False

protobuf_tester.py

要进行测试，请运行QGis，然后通过扩展菜单打开python控制台并在ProtobufTester条目下启动两个菜单点。

如果您像我一样遇到错误（发现protobuf 3.0.0但需要3.13.0）我该怎么解决？

解决方法

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pyqgis python qgis