feat: add document parsing sample

Author: ikesnowy

sample/Cnblogs.DashScope.Sample/Cnblogs.DashScope.Sample.csproj

@@ -41,6 +41,9 @@
     <None Update="table.jpg">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="scanned.jpg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
   <ItemGroup>

sample/Cnblogs.DashScope.Sample/Multimodal/OcrDocumentToLaTeXSample.cs

@@ -0,0 +1,43 @@
+using Cnblogs.DashScope.Core;
+
+namespace Cnblogs.DashScope.Sample.Multimodal;
+
+public class OcrDocumentToLaTeXSample : ISample
+{
+    /// <inheritdoc />
+    public string Description => "OCR parsing scanned document to LaTeX sample";
+
+    /// <inheritdoc />
+    public async Task RunAsync(IDashScopeClient client)
+    {
+        // upload file
+        await using var file = File.OpenRead("scanned.jpg");
+        var ossLink = await client.UploadTemporaryFileAsync("qwen-vl-ocr-latest", file, "scanned.jpg");
+        Console.WriteLine($"File uploaded: {ossLink}");
+        var messages =
+            new List<MultimodalMessage> { MultimodalMessage.User([MultimodalMessageContent.ImageContent(ossLink)]) };
+        var completion = await client.GetMultimodalGenerationAsync(
+            new ModelRequest<MultimodalInput, IMultimodalParameters>()
+            {
+                Model = "qwen-vl-ocr-latest",
+                Input = new MultimodalInput { Messages = messages },
+                Parameters = new MultimodalParameters()
+                {
+                    OcrOptions = new MultimodalOcrOptions()
+                    {
+                        Task = "document_parsing",
+                    }
+                }
+            });
+
+        Console.WriteLine("LaTeX:");
+        Console.WriteLine(completion.Output.Choices[0].Message.Content[0].Text);
+
+        if (completion.Usage != null)
+        {
+            var usage = completion.Usage;
+            Console.WriteLine(
+                $"Usage: in({usage.InputTokens})/out({usage.OutputTokens})/image({usage.ImageTokens})/total({usage.TotalTokens})");
+        }
+    }
+}