优化输出错误信息

Author: lindexi

src/MediaConverters/MediaConverters.Lib/Imaging/Optimizations/EnhancedGraphicsMetafileOptimization.cs

@@ -88,6 +88,8 @@ private static ImageFileOptimizationResult ConvertInLinux(ImageFileOptimizationC
         // 继续执行 libwmf 的转换，此时不支持 emf 格式
         if (string.Equals(file.Extension, ".emf"))
         {
+            context.LogMessage($"Convert emf to png is not supported with libwmf. File='{file}'");
+
             return new ImageFileOptimizationResult()
             {
                 OptimizedImageFile = null,

src/MediaConverters/MediaConverters.Tool/Program.cs

@@ -84,7 +84,13 @@ internal static async Task<ErrorCode> RunAsync(Options options)
 
         if (!imageFileOptimizationResult.IsSuccess)
         {
-            Console.Error.WriteLine(imageFileOptimizationResult);
+            var errorMessage = $"Failed to convert image file '{inputFile.FullName}'. Reason: {imageFileOptimizationResult.FailureReason}";
+            if (imageFileOptimizationResult.Exception is { } exception)
+            {
+                errorMessage += $" Exception: {exception}";
+            }
+
+            Console.Error.WriteLine(errorMessage);
 
             switch (imageFileOptimizationResult.FailureReason)
             {