From 09e3b42610283500021d234624d13eea67ec69f7 Mon Sep 17 00:00:00 2001
From: Mark van Renswoude <mark@x2software.net>
Date: Thu, 19 Mar 2015 08:56:52 +0000
Subject: [PATCH] FS#23 - Access Violation when using sub-categories

---
 Test/source/MainFrm.pas | 19 ++++++++++++++++++-
 X2Log.Decorator.pas     |  4 +++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Test/source/MainFrm.pas b/Test/source/MainFrm.pas
index 47994c8..d0dfcfa 100644
--- a/Test/source/MainFrm.pas
+++ b/Test/source/MainFrm.pas
@@ -271,8 +271,25 @@ end;
 
 
 procedure TMainForm.btnCategoryClick(Sender: TObject);
+
+  procedure Category2(ALog: IX2Log);
+  begin
+    ALog.Info(edtMessage.Text);
+  end;
+
+
+  procedure Category1(ALog: IX2Log);
+  begin
+    ALog.Info('Category 1');
+    Category2(ALog.Category('Sub-category'));
+    ALog.Info('/Category 1');
+  end;
+
+
 begin
-  FLog.Category('Test').Info(edtMessage.Text);
+  FLog.Info('Categories');
+  Category1(FLog.Category('Test'));
+  FLog.Info('/Categories');
 end;
 
 
diff --git a/X2Log.Decorator.pas b/X2Log.Decorator.pas
index 27c0151..0d9237b 100644
--- a/X2Log.Decorator.pas
+++ b/X2Log.Decorator.pas
@@ -8,6 +8,8 @@ uses
 
 
 type
+  TX2LogCategoryDecoratorClass = class of TX2LogCategoryDecorator;
+
   TX2LogCategoryDecorator = class(TInterfacedObject, IX2Log)
   private
     FCategoryName: string;
@@ -106,7 +108,7 @@ end;
 function TX2LogCategoryDecorator.Category(const ACategory: string): IX2Log;
 begin
   if Assigned(DecoratedLog) then
-    Result := Self.Create(DecoratedLog, GetCategory(ACategory));
+    Result := (TX2LogCategoryDecoratorClass(Self.ClassType)).Create(DecoratedLog, GetCategory(ACategory));
 end;