Python集成C#实现界面操作下载文件功能的全过程

/// <summary>
/// 当前地址
/// </summary>
public string ThisUrl
{
    get
    {
        return textUrl.Text;
    }
}

/// <summary>
/// 当前保存路径
/// </summary>
public string ThisSavePath
{
    get
    {
        return textSavePath.Text;
    }
}

/// <summary>
/// 下载事件委托
/// </summary>
public event EventHandler DownloadEvent;

/// <summary>
/// 下载按钮事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonDownload_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(this.textUrl.Text))
    {
        MessageBox.Show("请先输入要下载的文件地址！");
        this.textUrl.Focus();
        return;
    }
    if (string.IsNullOrEmpty(this.textSavePath.Text))
    {
        MessageBox.Show("请先选择文件要保存的地址！");
        this.textSavePath.Focus();
        return;
    }
    
    // 调用委托事件
    if(this.DownloadEvent != null)
    {
        this.DownloadEvent.Invoke(this, e);
    }
}

/// 选择按钮事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonSelect_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(this.textUrl.Text))
    {
        MessageBox.Show("请先输入要下载的文件地址！");
        this.textUrl.Focus();
        return;
    }

    var index = this.textUrl.Text.LastIndexOf("/");
    var fileName = this.textUrl.Text.Substring(index + 1);

    Thread importThread = new Thread(() => {
        var text = OpenDialog(fileName);
        MessageEvent(text);
    });
    importThread.SetApartmentState(ApartmentState.STA); //重点
    importThread.Start();
}

/// <summary>
/// 打开对话框
/// </summary>
private string OpenDialog(string fileName)
{
    var saveFileDialog = new SaveFileDialog();
    saveFileDialog.Filter = "所有文件 (*.*)|*.*";
    saveFileDialog.FilterIndex = 0;

    if (!string.IsNullOrEmpty(fileName))
    {
        saveFileDialog.FileName = Path.Combine(saveFileDialog.FileName, fileName);
    }

    DialogResult dialogResult = saveFileDialog.ShowDialog();
    if (dialogResult == DialogResult.OK)
    {
        return saveFileDialog.FileName;
    }
    return String.Empty;
}

import socket
import time
import re

mainapp = None

# 调用动态链接库的更新状态信息
def LogInfo(text):
    # print(text)
    mainapp.LogInfo(text)
    
# 调用动态链接库的更新下载进度
def downloadInfo(c, all):
    mainapp.SetProcess(c, all)
    if c == all:
        # LogInfo("下载进度 {:.2f}".format(c / all * 100))
        LogInfo("下载完成。")
    # else:
        # LogInfo("下载进度 {:.2f}%".format(c / all * 100))

# 监听下载委托事件
def Download(source, args):
    thisurl = source.ThisUrl.lower()
    thispath = source.ThisSavePath
    LogInfo("下载地址是: {}".format(thisurl))
    LogInfo("保存路径为: {}".format(thispath))
    
    reobj = re.compile(r"""(?xi)\A
    [a-z][a-z0-9+\-.]*://                                # Scheme
    ([a-z0-9\-._~%!$&'()*+,;=]+@)?                       # User
    ([a-z0-9\-._~%]+                                     # Named or IPv4 host
    |\[[a-z0-9\-._~%!$&'()*+,;=:]+\])                    # IPv6+ host
    """)
    match = reobj.search(thisurl)
    if match:
        HOST = match.group(2)
        PORT = 443 if thisurl.startswith('https') else 80
        mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        mysock.connect((HOST, PORT))
        
        urlend = 'GET {} HTTP/1.0\r\n\r\n'.format(thisurl).encode()
        # LogInfo("传递参数: {}".format(urlend))
        LogInfo("开始下载……")
        mysock.sendall(urlend)
        count = 0
        
        picture = b""
        hearlength = 0
        filelength = 0
        hearc = b""
        while True:
            data = mysock.recv(5120)
            if (len(data) < 1): break
            time.sleep(0.1)
            count = count + len(data)
            picture = picture + data
            
            # print(len(data), count)
            if hearlength == 0:
                hearlength = picture.find(b"\r\n\r\n")
                if hearlength > 0:
                    hearc = picture[:hearlength].decode()
                    # print(hearc)
                    sear = re.search('Content-Length: ([0-9]+)', hearc)
                    if sear:
                        filelength = int(sear.groups()[0])
                        downloadInfo(count - 4 - hearlength, filelength)
            else:
                downloadInfo(count - 4 - hearlength, filelength)
        mysock.close()

        # Skip past the header and save the picture data
        picture = picture[hearlength+4:]
        fhand = open(thispath, "wb")
        fhand.write(picture)
        fhand.close()

        # Code: http://www.py4e.com/code3/urljpeg.py
        # Or select Download from this trinket's left-hand menu
    else:
        LogInfo('下载失败，地址格式存在问题！')

# 使用 pythonnet 的方式引入动态链接库

import clr

# 此处保证动态链接库文件放在当前文件夹中，如果不在应该使用这种方式
# clr.AddReference('D:\\Path\\DotNetWithPython')
# clr.AddReference('D:\\Path\\DotNetWithPython.dll')
clr.AddReference('DotNetWithPython')
from DotNetWithPython import *
mainapp = MainForm()
mainapp.DownloadEvent += Download
mainapp.ShowDialog()