feat: 初始功能

Services/PrintService.cs

@@ -0,0 +1,170 @@
+using System.Drawing.Printing;
+using System.Management;
+using CloudPrint.Client.Models;
+using CloudPrint.Client.Services.Abstractions;
+using CloudPrint.Client.Services.Printing;
+
+namespace CloudPrint.Client.Services;
+
+/// <summary>
+/// 真实打印服务：枚举 Windows 打印机，按文件类型提交到图片/PDF/RAW 打印执行器。
+/// </summary>
+public sealed class PrintService : IPrintService
+{
+    private readonly IReadOnlyList<IPrintJobExecutor> _executors;
+    private readonly IPrinterStatusReader _statusReader;
+    private readonly IWindowsPrintQueueService _queueService;
+
+    public PrintService()
+        : this(CreateDefaultExecutors(), new WindowsPrinterStatusReader(), new WindowsPrintQueueService())
+    {
+    }
+
+    private static IReadOnlyList<IPrintJobExecutor> CreateDefaultExecutors()
+    {
+        var queueService = new WindowsPrintQueueService();
+        return new IPrintJobExecutor[]
+        {
+            new ImagePrintJobExecutor(queueService),
+            new PdfPrintJobExecutor(queueService),
+            new RawPrintJobExecutor()
+        };
+    }
+
+    public PrintService(IEnumerable<IPrintJobExecutor> executors, IPrinterStatusReader statusReader, IWindowsPrintQueueService queueService)
+    {
+        _executors = executors.ToList();
+        _statusReader = statusReader;
+        _queueService = queueService;
+        if (_executors.Count == 0)
+        {
+            throw new ArgumentException("至少需要一个打印执行器", nameof(executors));
+        }
+    }
+
+    public IReadOnlyList<PrinterInfo> GetPrinters()
+    {
+        var printers = new List<PrinterInfo>();
+        var index = 1;
+
+        foreach (string printerName in PrinterSettings.InstalledPrinters)
+        {
+            if (IsVirtualPrinter(printerName))
+            {
+                continue;
+            }
+
+            var snapshot = _statusReader.Read(printerName);
+            printers.Add(new PrinterInfo
+            {
+                Id = index++,
+                Name = printerName,
+                DisplayName = printerName,
+                IsActive = true,
+                Status = snapshot.Status,
+                QueueCount = snapshot.QueueCount,
+                StatusMessage = snapshot.Message,
+                LastHeartbeat = DateTime.Now
+            });
+        }
+
+        return printers;
+    }
+
+    public PrinterStatus GetPrinterStatus(string printerName)
+    {
+        if (string.IsNullOrWhiteSpace(printerName))
+        {
+            return PrinterStatus.Unknown;
+        }
+
+        return _statusReader.Read(printerName).Status;
+    }
+
+    public async Task<string> SubmitPrintJobAsync(PrintJob job, IProgress<int>? progress = null, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(job);
+
+        job.StartedAt = DateTime.Now;
+        job.MarkPrinting();
+        progress?.Report(5);
+
+        var executor = _executors.FirstOrDefault(item => item.CanHandle(job))
+            ?? throw new NotSupportedException($"没有可用的打印执行器处理文件：{job.FilePath}");
+
+        await executor.ExecuteAsync(job, progress, cancellationToken).ConfigureAwait(true);
+        job.MarkCompleted();
+        return job.JobNo;
+    }
+
+    public bool CancelPrintJob(string jobId)
+    {
+        return !string.IsNullOrWhiteSpace(jobId);
+    }
+
+    public bool CancelPrintJob(PrintJob job)
+    {
+        ArgumentNullException.ThrowIfNull(job);
+        return job.WindowsJobId is > 0 && _queueService.CancelJob(job.PrinterName, job.WindowsJobId.Value);
+    }
+
+    public PrintJobStatus GetJobStatus(string jobId)
+    {
+        return string.IsNullOrWhiteSpace(jobId) ? PrintJobStatus.Failed : PrintJobStatus.Pending;
+    }
+
+    private static bool IsVirtualPrinter(string printerName)
+    {
+        if (string.IsNullOrWhiteSpace(printerName))
+        {
+            return true;
+        }
+
+        try
+        {
+            using var searcher = new ManagementObjectSearcher("SELECT Name, DriverName, PortName FROM Win32_Printer");
+            foreach (ManagementObject printer in searcher.Get())
+            {
+                var name = Convert.ToString(printer["Name"]);
+                if (!string.Equals(name, printerName, StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                var driverName = Convert.ToString(printer["DriverName"]) ?? string.Empty;
+                var portName = Convert.ToString(printer["PortName"]) ?? string.Empty;
+                return IsKnownVirtualPrinter(printerName, driverName, portName);
+            }
+        }
+        catch
+        {
+            // If WMI is unavailable, fall back to conservative name-based filtering.
+        }
+
+        return IsKnownVirtualPrinter(printerName, string.Empty, string.Empty);
+    }
+
+    private static bool IsKnownVirtualPrinter(string printerName, string driverName, string portName)
+    {
+        var value = $"{printerName}|{driverName}|{portName}";
+        return ContainsAny(value,
+            "Microsoft Print to PDF",
+            "Microsoft XPS Document Writer",
+            "OneNote",
+            "Fax",
+            "Foxit PDF",
+            "PDF Printer",
+            "Print to Evernote",
+            "Evernote",
+            "XPS",
+            "PORTPROMPT:",
+            "FILE:",
+            "NUL:");
+    }
+
+    private static bool ContainsAny(string value, params string[] candidates)
+    {
+        return candidates.Any(candidate => value.Contains(candidate, StringComparison.OrdinalIgnoreCase));
+    }
+
+}