Fix C# APIs (#183)

* Fix c# APIs

* reformat

 cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 project(sherpa-onnx)
 
-set(SHERPA_ONNX_VERSION "1.4.4")
+set(SHERPA_ONNX_VERSION "1.4.5")
 
 # Disable warning about
 #

@@ -5,59 +5,54 @@
 // This file shows how to use sherpa-onnx C API
 // to decode a file.
 
-#include "cargs.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+#include "cargs.h"
 #include "sherpa-onnx/c-api/c-api.h"
 
 static struct cag_option options[] = {
-  {
-    .identifier = 't',
-    .access_letters = NULL,
-    .access_name = "tokens",
-    .value_name = "tokens",
-    .description = "Tokens file"
-  }, {
-    .identifier = 'e',
-    .access_letters = NULL,
-    .access_name = "encoder",
-    .value_name = "encoder",
-    .description = "Encoder ONNX file"
-  }, {
-    .identifier = 'd',
-    .access_letters = NULL,
-    .access_name = "decoder",
-    .value_name = "decoder",
-    .description = "Decoder ONNX file"
-  }, {
-    .identifier = 'j',
-    .access_letters = NULL,
-    .access_name = "joiner",
-    .value_name = "joiner",
-    .description = "Joiner ONNX file"
-  }, {
-    .identifier = 'n',
-    .access_letters = NULL,
-    .access_name = "num-threads",
-    .value_name = "num-threads",
-    .description = "Number of threads"
-  }, {
-    .identifier = 'p',
-    .access_letters = NULL,
-    .access_name = "provider",
-    .value_name = "provider",
-    .description = "Provider: cpu (default), cuda, coreml"
-  }, {
-    .identifier = 'm',
-    .access_letters = NULL,
-    .access_name = "decoding-method",
-    .value_name = "decoding-method",
-    .description = 
-      "Decoding method: greedy_search (default), modified_beam_search"
-  }
-};
+    {.identifier = 'h',
+     .access_letters = "h",
+     .access_name = "help",
+     .description = "Show help"},
+    {.identifier = 't',
+     .access_letters = NULL,
+     .access_name = "tokens",
+     .value_name = "tokens",
+     .description = "Tokens file"},
+    {.identifier = 'e',
+     .access_letters = NULL,
+     .access_name = "encoder",
+     .value_name = "encoder",
+     .description = "Encoder ONNX file"},
+    {.identifier = 'd',
+     .access_letters = NULL,
+     .access_name = "decoder",
+     .value_name = "decoder",
+     .description = "Decoder ONNX file"},
+    {.identifier = 'j',
+     .access_letters = NULL,
+     .access_name = "joiner",
+     .value_name = "joiner",
+     .description = "Joiner ONNX file"},
+    {.identifier = 'n',
+     .access_letters = NULL,
+     .access_name = "num-threads",
+     .value_name = "num-threads",
+     .description = "Number of threads"},
+    {.identifier = 'p',
+     .access_letters = NULL,
+     .access_name = "provider",
+     .value_name = "provider",
+     .description = "Provider: cpu (default), cuda, coreml"},
+    {.identifier = 'm',
+     .access_letters = NULL,
+     .access_name = "decoding-method",
+     .value_name = "decoding-method",
+     .description =
+         "Decoding method: greedy_search (default), modified_beam_search"}};
 
 const char *kUsage =
     "\n"
@@ -67,6 +62,7 @@ const char *kUsage =
     "    --encoder=/path/to/encoder.onnx \\\n"
     "    --decoder=/path/to/decoder.onnx \\\n"
     "    --joiner=/path/to/joiner.onnx \\\n"
+    "    --provider=cpu \\\n"
     "    /path/to/foo.wav\n"
     "\n\n"
     "Default num_threads is 1.\n"
@@ -77,6 +73,11 @@ const char *kUsage =
     "for a list of pre-trained models to download.\n";
 
 int32_t main(int32_t argc, char *argv[]) {
+  if (argc < 6) {
+    fprintf(stderr, "%s\n", kUsage);
+    exit(0);
+  }
+
   SherpaOnnxOnlineRecognizerConfig config;
 
   config.model_config.debug = 0;
@@ -105,19 +106,38 @@ int32_t main(int32_t argc, char *argv[]) {
     identifier = cag_option_get(&context);
     value = cag_option_get_value(&context);
     switch (identifier) {
-      case 't': config.model_config.tokens = value; break;
-      case 'e': config.model_config.encoder = value; break;
-      case 'd': config.model_config.decoder = value; break;
-      case 'j': config.model_config.joiner = value; break;
-      case 'n': config.model_config.num_threads = atoi(value); break;
-      case 'p': config.model_config.provider = value; break;
-      case 'm': config.decoding_method = value; break;
-      default: 
+      case 't':
+        config.model_config.tokens = value;
+        break;
+      case 'e':
+        config.model_config.encoder = value;
+        break;
+      case 'd':
+        config.model_config.decoder = value;
+        break;
+      case 'j':
+        config.model_config.joiner = value;
+        break;
+      case 'n':
+        config.model_config.num_threads = atoi(value);
+        break;
+      case 'p':
+        config.model_config.provider = value;
+        break;
+      case 'm':
+        config.decoding_method = value;
+        break;
+      case 'h': {
+        fprintf(stderr, "%s\n", kUsage);
+        exit(0);
+        break;
+      }
+      default:
         // do nothing as config already have valid default values
         break;
     }
   }
-  
+
   SherpaOnnxOnlineRecognizer *recognizer = CreateOnlineRecognizer(&config);
   SherpaOnnxOnlineStream *stream = CreateOnlineStream(recognizer);
 

@@ -20,6 +20,9 @@ class OnlineDecodeFiles
     [Option(Required = true, HelpText = "Path to tokens.txt")]
     public string Tokens { get; set; }
 
+    [Option(Required = false, Default = "cpu", HelpText = "Provider, e.g., cpu, coreml")]
+    public string Provider { get; set; }
+
     [Option(Required = true, HelpText = "Path to encoder.onnx")]
     public string Encoder { get; set; }
 
@@ -124,6 +127,7 @@ to download pre-trained streaming models.
     config.TransducerModelConfig.Decoder = options.Decoder;
     config.TransducerModelConfig.Joiner = options.Joiner;
     config.TransducerModelConfig.Tokens = options.Tokens;
+    config.TransducerModelConfig.Provider = options.Provider;
     config.TransducerModelConfig.NumThreads = options.NumThreads;
     config.TransducerModelConfig.Debug = options.Debug ? 1 : 0;
 

@@ -23,6 +23,7 @@ namespace SherpaOnnx
       Joiner = "";
       Tokens = "";
       NumThreads = 1;
+      Provider = "cpu";
       Debug = 0;
     }
     [MarshalAs(UnmanagedType.LPStr)]
@@ -40,6 +41,9 @@ namespace SherpaOnnx
     /// Number of threads used to run the neural network model
     public int NumThreads;
 
+    [MarshalAs(UnmanagedType.LPStr)]
+    public string Provider;
+
     /// true to print debug information of the model
     public int Debug;
   }