feat: 初始功能

Services/Printing/RawPrintJobExecutor.cs

@@ -0,0 +1,94 @@
+using CloudPrint.Client.Helpers;
+using CloudPrint.Client.Models;
+using System.IO;
+
+namespace CloudPrint.Client.Services.Printing;
+
+public sealed class RawPrintJobExecutor : IPrintJobExecutor
+{
+    public bool CanHandle(PrintJob job) => true;
+
+    public async Task ExecuteAsync(PrintJob job, IProgress<int>? progress, CancellationToken cancellationToken = default)
+    {
+        PrintFileGuards.EnsurePrintableFile(job);
+
+        if (!WindowsPrintApi.OpenPrinter(job.PrinterName, out var printerHandle, IntPtr.Zero))
+        {
+            throw new InvalidOperationException($"打开打印机失败：{job.PrinterName}");
+        }
+
+        try
+        {
+            var docInfo = new WindowsPrintApi.DocInfo
+            {
+                DocumentName = string.IsNullOrWhiteSpace(job.FileName) ? job.JobNo : job.FileName,
+                DataType = "RAW"
+            };
+
+            var windowsJobId = WindowsPrintApi.StartDocPrinter(printerHandle, 1, docInfo);
+            if (windowsJobId == 0)
+            {
+                throw new InvalidOperationException("启动打印文档失败");
+            }
+
+            job.WindowsJobId = windowsJobId;
+            job.WindowsJobStatus = "已提交到 Windows 打印队列";
+
+            try
+            {
+                if (!WindowsPrintApi.StartPagePrinter(printerHandle))
+                {
+                    throw new InvalidOperationException("启动打印页面失败");
+                }
+
+                try
+                {
+                    await WriteFileToPrinterAsync(printerHandle, job.FilePath, progress, cancellationToken).ConfigureAwait(true);
+                }
+                finally
+                {
+                    WindowsPrintApi.EndPagePrinter(printerHandle);
+                }
+            }
+            finally
+            {
+                WindowsPrintApi.EndDocPrinter(printerHandle);
+            }
+        }
+        finally
+        {
+            WindowsPrintApi.ClosePrinter(printerHandle);
+        }
+    }
+
+    private static async Task WriteFileToPrinterAsync(IntPtr printerHandle, string filePath, IProgress<int>? progress, CancellationToken cancellationToken)
+    {
+        const int bufferSize = 64 * 1024;
+        var buffer = new byte[bufferSize];
+        var fileInfo = new FileInfo(filePath);
+        long totalWritten = 0;
+
+        await using var stream = File.OpenRead(filePath);
+        while (true)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            var read = await stream.ReadAsync(buffer.AsMemory(0, buffer.Length), cancellationToken).ConfigureAwait(true);
+            if (read == 0)
+            {
+                break;
+            }
+
+            var chunk = read == buffer.Length ? buffer : buffer[..read];
+            if (!WindowsPrintApi.WritePrinter(printerHandle, chunk, read, out var written) || written != read)
+            {
+                throw new InvalidOperationException("写入打印机失败");
+            }
+
+            totalWritten += written;
+            var percent = fileInfo.Length == 0 ? 100 : (int)Math.Min(99, totalWritten * 100 / fileInfo.Length);
+            progress?.Report(percent);
+        }
+
+        progress?.Report(100);
+    }
+}