feat: 初始功能

Services/Printing/WindowsPrinterStatusReader.cs

@@ -0,0 +1,119 @@
+using CloudPrint.Client.Models;
+using System.Management;
+
+namespace CloudPrint.Client.Services.Printing;
+
+public sealed class WindowsPrinterStatusReader : IPrinterStatusReader
+{
+    public PrinterStatusSnapshot Read(string printerName)
+    {
+        if (string.IsNullOrWhiteSpace(printerName))
+        {
+            return new PrinterStatusSnapshot { Status = PrinterStatus.Unknown, Message = "打印机名称为空" };
+        }
+
+        try
+        {
+            return ReadCore(printerName);
+        }
+        catch (Exception ex)
+        {
+            return new PrinterStatusSnapshot
+            {
+                Status = PrinterStatus.Unknown,
+                Message = $"状态读取失败：{ex.Message}"
+            };
+        }
+    }
+
+    private static PrinterStatusSnapshot ReadCore(string printerName)
+    {
+        using var searcher = new ManagementObjectSearcher(
+            "SELECT Name, WorkOffline, PrinterStatus, DetectedErrorState FROM Win32_Printer");
+
+        foreach (ManagementObject printer in searcher.Get())
+        {
+            var name = Convert.ToString(printer["Name"]);
+            if (!string.Equals(name, printerName, StringComparison.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            var workOffline = Convert.ToBoolean(printer["WorkOffline"] ?? false);
+            var printerStatus = Convert.ToUInt32(printer["PrinterStatus"] ?? 2u);
+            var errorState = Convert.ToUInt32(printer["DetectedErrorState"] ?? 0u);
+            var queueCount = CountQueueJobs(printerName);
+
+            var status = MapStatus(workOffline, printerStatus, errorState, queueCount);
+            return new PrinterStatusSnapshot
+            {
+                Status = status,
+                QueueCount = queueCount,
+                Message = BuildMessage(workOffline, printerStatus, errorState)
+            };
+        }
+
+        return new PrinterStatusSnapshot
+        {
+            Status = PrinterStatus.Offline,
+            Message = "未找到打印机"
+        };
+    }
+
+    private static int CountQueueJobs(string printerName)
+    {
+        var escapedName = printerName.Replace("\\", "\\\\", StringComparison.Ordinal).Replace("'", "''", StringComparison.Ordinal);
+        using var searcher = new ManagementObjectSearcher($"SELECT Name FROM Win32_PrintJob WHERE Name LIKE '{escapedName},%'");
+        return searcher.Get().Count;
+    }
+
+    private static PrinterStatus MapStatus(bool workOffline, uint printerStatus, uint errorState, int queueCount)
+    {
+        if (workOffline || printerStatus == 7)
+        {
+            return PrinterStatus.Offline;
+        }
+
+        if (errorState is >= 3 and <= 11 || printerStatus == 6)
+        {
+            return PrinterStatus.Error;
+        }
+
+        if (printerStatus == 4 || queueCount > 0)
+        {
+            return PrinterStatus.Printing;
+        }
+
+        return printerStatus == 3 ? PrinterStatus.Idle : PrinterStatus.Unknown;
+    }
+
+    private static string BuildMessage(bool workOffline, uint printerStatus, uint errorState)
+    {
+        if (workOffline)
+        {
+            return "脱机";
+        }
+
+        return errorState switch
+        {
+            3 => "缺纸",
+            4 => "卡纸",
+            5 => "碳粉不足",
+            6 => "门打开",
+            7 => "需要人工干预",
+            8 => "离线",
+            9 => "维修中",
+            10 => "输出纸盘已满",
+            11 => "缺纸",
+            _ => printerStatus switch
+            {
+                3 => "就绪",
+                4 => "打印中",
+                5 => "预热中",
+                6 => "已停止",
+                7 => "离线",
+                _ => string.Empty
+            }
+        };
+    }
+}