This isn't finished, but I think represents a better way of handling warnings and errors that doesn't treat warnings as errors

YaraSharp/Compiler.cpp

@@ -10,7 +10,11 @@ namespace YaraSharp
 		ErrorUtility::ThrowOnError(yr_compiler_create(&TestCompiler));
 		Compiler = TestCompiler;
 
-		Errors = gcnew List<String^>();
+		// Set up and initialize the error dictionary for errors and warnings
+		// Which are populated by the callback handler
+		Errors = gcnew Dictionary<int, List<String^>^>();
+		Errors->Add(YARA_ERROR_LEVEL_ERROR, gcnew List<String^>());
+		Errors->Add(YARA_ERROR_LEVEL_WARNING, gcnew List<String^>());
 		
 		SetCompilerExternals(ExternalVariables);
 		SetCompilerCallback();
@@ -52,7 +56,11 @@ namespace YaraSharp
 	}
 	List<String^>^ CCompiler::GetErrors()
 	{
-		return this->Errors;
+		return this->Errors[YARA_ERROR_LEVEL_ERROR];
+	}
+	List<String^>^ CCompiler::GetWarnings()
+	{
+		return this->Errors[YARA_ERROR_LEVEL_WARNING];
 	}
 
 	//	Set externals
@@ -99,20 +107,11 @@ namespace YaraSharp
 		UNREFERENCED_PARAMETER(UserData);
 
 		String^ errorLevel;
-
-		if (ErrorLevel == YARA_ERROR_LEVEL_ERROR)
-		{
-			errorLevel = "ERROR";
-		}
-		else if (ErrorLevel == YARA_ERROR_LEVEL_WARNING)
-		{
-			errorLevel = "WARNING";
-		}
-
-		auto msg = String::Format("{0}: {1} on line {2} in file: {3}",
-			errorLevel, marshal_as<String^>(Message), LineNumber,
+		
+		auto msg = String::Format("{0} on line {1} in file: {2}",
+			marshal_as<String^>(Message), LineNumber,
 			Filename ? marshal_as<String^>(Filename) : "[none]");
 
-		Errors->Add(msg);
+		Errors[ErrorLevel]->Add(msg);
 	}
 }

YaraSharp/Compiler.h

@@ -8,7 +8,7 @@ namespace YaraSharp
 	public ref class CCompiler sealed
 	{
 		initonly YR_COMPILER* Compiler;
-		initonly List<String^>^ Errors;
+		initonly Dictionary<int, List<String^>^>^ Errors;
 
 	public:
 		CCompiler(Dictionary<String^, Object^>^ ExternalVariables);
@@ -16,6 +16,7 @@ namespace YaraSharp
 
 		CRules^ GetRules();
 		List<String^>^ GetErrors();
+		List<String^>^ GetWarnings();
 		int AddFile(String^ FilePath);
 		void AddFiles(List<String^>^ FilePathList);
 

YaraSharp/YaraSharp.cpp

@@ -19,6 +19,10 @@ namespace YaraSharp
 				CompilationErrors->Add(FilePathList[i], TestCompiler->GetErrors());
 				FilePathList->Remove(FilePathList[i--]);
 			}
+			else if (TestCompiler->GetWarnings()->Count > 0)
+			{
+				CompilationErrors->Add(FilePathList[i], TestCompiler->GetWarnings());
+			}
 
 			delete TestCompiler;
 		}
@@ -41,6 +45,10 @@ namespace YaraSharp
 					delete TestCompiler;
 					break;
 				}
+				else if (TestCompiler->GetWarnings()->Count > 0)
+				{
+					CompilationErrors->Add(FilePath, TestCompiler->GetWarnings());
+				}
 			}
 		}