win-service-machine-dll/PrintHtml/PrintHtml.cs

using Microsoft.Web.WebView2.Core;
using Microsoft.Web.WebView2.WinForms;
using Newtonsoft.Json.Linq;
using PdfiumViewer;
using prBrowser;
using System;
using System.Collections.Generic;
using System.Drawing.Printing;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PrintHtml
{
    public class PrintHtml
    {

        private readonly HttpClient _httpClient = new HttpClient(); // 重用 HttpClient 实例
        Thread thread;
        string inputParams = "";
        dynamic paperobj;
        PrintSettings settings;
        [STAThread]

        public string PrintUrlHtml(string input)
        {
            System.Diagnostics.Debugger.Launch();
            String errorCode = "0";
            String errorMessage = "";
            inputParams = input;
            JObject output = new JObject();
            JArray fileStringArray = new JArray();
            try
            {
                dynamic inputobj = Newtonsoft.Json.JsonConvert.DeserializeObject<dynamic>(input);
                var paramsobj = inputobj["params"][0];
                thread = new Thread(new ThreadStart(ReportFormd));
                thread.SetApartmentState(ApartmentState.STA); //重点
                thread.Start();
                thread.Join();
            }
            catch (Exception ex)
            {
                errorMessage = ex.Message;
            }
            output.Add("errorCode", errorCode);
            output.Add("errorMessage", errorMessage);
            return output.ToString();

        }
        private void ReportFormd()
        {
            try
            {
                PrinFrom dForm = new PrinFrom(inputParams);
                dForm.ShowDialog();

            }
            catch (Exception ex2)
            {
            }
            thread.Abort();

        }
        public string PrintInfo(string inputString)
        {
            string output = "";
            output = Task.Run(async () => await PrintURLAsync(inputString)).Result;
            return output;
        }
        /// <summary>
        /// 打印指定 URL 的 PDF 文件。
        /// </summary>
        /// <param name="inParams">输入参数的 JSON 字符串</param>
        /// <returns>操作结果的 JSON 字符串</returns>
        public async Task<string> PrintURLAsync(string inParams)
        {
            //System.Diagnostics.Debugger.Launch();
            string errorCode = "0";
            string errorMessage = "打印成功";
            string tempPdfPath = string.Empty;
            PdfDocument pdfDocument = null;
            PrintDocument pdfPrintDoc = null;

            try
            {
                if (string.IsNullOrWhiteSpace(inParams))
                {
                    return CreateErrorResponse("-1", "输入参数不能为空");
                }

                var inParamsObj = JObject.Parse(inParams);
                var inParamsResult = inParamsObj["result"];
                string url = inParamsResult?["url"]?.ToString();
                if (string.IsNullOrWhiteSpace(url))
                {
                    return CreateErrorResponse("-1", "URL 不能为空");
                }
                // 确保临时目录存在
                // 确保临时目录存在
                string tempDir = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
                tempDir = tempDir + "\\tmpPDF";
                tempPdfPath = Path.Combine(tempDir, $"{Guid.NewGuid()}.pdf");

                // 1. 异步下载 PDF 文件
                bool downloaded = await DownloadPdfFileAsync(url, tempPdfPath);
                if (!downloaded)
                {
                    return CreateErrorResponse("-1", "PDF 文件下载失败");
                }

                paperobj = inParamsObj["printParameters"];
                if (paperobj == null)
                {
                    paperobj = new JObject
                    {
                        ["PaperName"] = "A4",
                        ["Landscape"] = false,
                        ["ManualDuplex"]= false
                    };
                }
                // 2. 配置打印机设置
                GetPrintSettings();
                // 3. 加载 PDF 并打印
                PrintPdf pdf = new PrintPdf();
                pdf.Print(tempPdfPath, settings);
                // 成功打印后返回成功信息
                return CreateResponseString(errorCode, errorMessage, new JObject());

            }
            catch (Exception ex)
            {
                //Console.WriteLine($"PrintURLAsync 发生未处理异常: {ex}");
                errorCode = "-1";
                errorMessage = $"打印 PDF 时发生错误: {ex.Message}";
                // 异常时也返回字符串
                return CreateResponseString(errorCode, errorMessage, new JObject());
            }
            finally
            {
                // 5. 释放资源并清理临时文件

                if (!string.IsNullOrEmpty(tempPdfPath) && File.Exists(tempPdfPath))
                {
                    try
                    {
                        File.Delete(tempPdfPath);
                    }
                    catch (Exception ex)
                    {
                        // 记录删除失败日志，但不应中断主流程
                        //Console.WriteLine($"警告：无法删除临时文件 {tempPdfPath}: {ex.Message}");
                    }
                }
            }

            // 这行代码理论上不会执行到，因为 try/catch 块都会 return
        }

        /// <summary>
        /// 异步下载 PDF 文件。（兼容 .NET Framework）
        /// </summary>
        /// <param name="url">PDF 文件的 URL</param>
        /// <param name="filePath">保存到本地的文件路径</param>
        /// <returns>下载是否成功</returns>
        private async Task<bool> DownloadPdfFileAsync(string url, string filePath)
        {
            try
            {
                // 发送 GET 请求获取内容流
                using (HttpResponseMessage response = await _httpClient.GetAsync(url, HttpCompletionOption.ResponseHeadersRead))
                {
                    if (response.IsSuccessStatusCode)
                    {
                        // 使用 FileStream 异步写入
                        using (FileStream fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: 8192, useAsync: true))
                        {
                            // 获取响应内容流
                            using (Stream contentStream = await response.Content.ReadAsStreamAsync())
                            {
                                // 异步复制内容流到文件流
                                await contentStream.CopyToAsync(fileStream);
                            }
                        }
                        return true;
                    }
                    else
                    {
                        //Console.WriteLine($"无法下载文件，状态码：{response.StatusCode}");
                        return false;
                    }
                }
            }
            catch (Exception ex)
            {
                //Console.WriteLine($"下载过程中发生错误：{ex.Message}");
                return false;
            }
        }

        /// <summary>
        /// 根据参数配置打印机设置。
        /// </summary>
        /// <param name="printParametersJson">打印机参数的 JSON 字符串</param>
        /// <returns>配置好的 PrinterSettings 对象</returns>
        
        private void GetPrinterSettings(PrintSettings settings)
        {
            PrinterSettings printerSettings = new PrinterSettings();
            if (paperobj != null)
            {
                if (paperobj["PrinterName"] != null && !string.IsNullOrEmpty(paperobj["PrinterName"].ToString()))
                {
                    foreach (PrinterSettings printer in PrinterSettings.InstalledPrinters)
                    {
                        if (printer.PrinterName == paperobj["PrinterName"].ToString())
                        {
                            printerSettings = printer;
                            break;
                        }
                    }
                }
            }

            PaperSize paperSize = new PaperSize();
            
            string paperName = "A4";
            if (paperobj["PaperName"] != null && !"A4".Equals(paperobj["PaperName"].ToString()))
            {
                paperName = paperobj["PaperName"].ToString();
            }

            foreach (PaperSize size in printerSettings.PaperSizes)
            {
                if (size.PaperName == paperName)
                {
                    paperSize = size;
                    break;
                }
            }

            settings.SelectedPaperSize = paperSize;
            
            printerSettings.DefaultPageSettings.PaperSize = paperSize;
            
            printerSettings.DefaultPageSettings.Margins.Left = 0;
            printerSettings.DefaultPageSettings.Margins.Right = 0;
            printerSettings.DefaultPageSettings.Margins.Bottom = 0;
            printerSettings.DefaultPageSettings.Landscape = settings.IsLandscape;
            printerSettings.Copies = (short)settings.Copies;
            if (settings.PrintedByRange)
            {
                printerSettings.PrintRange = PrintRange.SomePages;
                printerSettings.FromPage = settings.FromPage;
                printerSettings.ToPage = settings.ToPage;
            }
            printerSettings.Duplex = settings.Duplex;
            
            settings.printerSettings = printerSettings;

        }


        public PrintSettings GetPrintSettings()
        {
            settings = new PrintSettings();
            
            if (paperobj != null)
            {
                if (paperobj["Landscape"] != null && !string.IsNullOrEmpty(paperobj["Landscape"].ToString()))
                {
                    settings.IsLandscape = bool.Parse(paperobj["Landscape"].ToString());
                }
                if (paperobj["Copies"] != null && !string.IsNullOrEmpty(paperobj["Copies"].ToString()))
                {
                    settings.Copies = int.Parse(paperobj["Copies"].ToString()); // 打印份数，默认是1

                }
                if (paperobj["ManualDuplex"] != null && !string.IsNullOrEmpty(paperobj["ManualDuplex"].ToString()))
                {
                    settings.manualDuplex = bool.Parse(paperobj["ManualDuplex"].ToString());
                }

                settings.Duplex = Duplex.Simplex;
                if (paperobj["Duplex"] != null)
                {
                    if (paperobj["Duplex"].ToString() == "Horizontal")
                    {
                        settings.Duplex = Duplex.Horizontal;
                    }
                    if (paperobj["Duplex"].ToString() == "Vertical")
                    {
                        settings.Duplex = Duplex.Vertical;
                    }
                }
                if (paperobj["PageRanges"] != null)
                {
                    string pageRanges = paperobj["PageRanges"].ToString();
                    if (!string.IsNullOrEmpty(pageRanges))
                    {
                        settings.PrintedByRange = true;
                        if (pageRanges.IndexOf("-") > 0)
                        {
                            settings.FromPage = int.Parse(pageRanges.Split("-".ToCharArray())[0]);
                            settings.ToPage = int.Parse(pageRanges.Split("-".ToCharArray())[0]);
                        }
                        else
                        {
                            settings.FromPage = int.Parse(pageRanges);
                            settings.ToPage = settings.FromPage;
                        }
                    }
                }

                if (paperobj["DuplexTip"] != null)
                {
                    string _duplexTips = paperobj["DuplexTip"].ToString();
                    if (!string.IsNullOrEmpty(_duplexTips))
                    {
                        settings.duplexTips = _duplexTips;
                    }
                }

            }
            
            GetPrinterSettings(settings);

            return settings;
        }
        private async Task PrintPdfWithWebView2(string pdfPath)
        {
            // 创建一个不可见的 WinForms 窗口来承载 WebView2
            using (var form = new Form())
            {
                // 设置窗口为不可见，不显示在任务栏
                form.WindowState = FormWindowState.Minimized;
                form.ShowInTaskbar = false;
                form.Opacity = 0; // 完全透明
                form.Visible = false; // 完全隐藏

                var webView2 = new WebView2
                {
                    Dock = DockStyle.Fill
                };

                form.Controls.Add(webView2);

                // 初始化 WebView2
                await webView2.EnsureCoreWebView2Async(null);

                // 设置 PDF 文件的 URL
                string fileUrl = new Uri(pdfPath).AbsoluteUri;
                webView2.CoreWebView2.Navigate(fileUrl);

                // 等待页面加载完成
                TaskCompletionSource<bool> printTask = new TaskCompletionSource<bool>();

                webView2.CoreWebView2.NavigationCompleted += async (sender, e) =>
                {
                    if (e.IsSuccess)
                    {
                        // 等待一段时间确保 PDF 完全加载
                        await Task.Delay(2000); // 增加等待时间以确保 PDF 完全渲染

                        try
                        {
                            // 调用 JavaScript 的 window.print() 方法
                            await webView2.CoreWebView2.ExecuteScriptAsync("window.print();");
                        }
                        catch (Exception ex)
                        {
                            // 如果打印失败，记录错误但继续
                            Console.WriteLine($"打印调用失败: {ex.Message}");
                        }

                        // 设置任务完成
                        printTask.SetResult(true);
                    }
                    else
                    {
                        printTask.SetException(new Exception($"PDF 加载失败: {e.WebErrorStatus}"));
                    }
                };

                // 启动消息循环
                form.Show();

                // 等待打印完成或超时
                var timeoutTask = Task.Delay(TimeSpan.FromSeconds(30)); // 30秒超时
                var completedTask = await Task.WhenAny(printTask.Task, timeoutTask);

                if (completedTask == timeoutTask)
                {
                    throw new TimeoutException("PDF 打印超时");
                }

                // 确保表单关闭
                form.Invoke((MethodInvoker)delegate
                {
                    form.Close();
                });
            }
        }

        private string CreateErrorResponse(string errorCode, string errorMessage)
        {
            return CreateResponseString(errorCode, errorMessage, new JObject()); // 确保返回 string
        }
        private string CreateResponseString(string errorCode, string errorMessage, JObject result)
        {
            return CreateResponse(errorCode, errorMessage, result).ToString(); // 调用 JObject 版本并转为 string
        }
        private JObject CreateResponse(string errorCode, string errorMessage, JObject result)
        {
            var output = new JObject
            {
                ["errorCode"] = errorCode,
                ["errorMessage"] = errorMessage,
                ["result"] = result ?? new JObject()
            };
            return output; // 返回 JObject
        }
    }
}