Updated installer with custom action

installer/src/installer-lib/custom-i18n.h

+/**
+ * \file custom-i18n.h
+ */
+
+#ifndef CUSTOM_I18N_H
+#define CUSTOM_I18N_H
+
+#include <database.h>
+
+//-------------------------------------------------------
+// Message box text
+//-------------------------------------------------------
+/**
+ * Accessor to localizable content for custom actions.
+ *
+ * This class requires that the MSI contain a custom table named "AbpUIText" in the MSI database.
+ * The WiX definition of that table is in the file "custom_i18n.wxi".
+ * Each custom action has the responsibility for defining its own rows within this table.
+ */
+class custom_message_text
+{
+  Database & db ;
+  const std::wstring component ;
+
+public:
+  custom_message_text( Database & db, const std::wstring component )
+    : db( db ), component( component )
+  {}
+
+  std::wstring text( const std::wstring id )
+  {
+    try {
+      View v( db, L"SELECT `content` FROM `AbpUIText` WHERE `component`=? and `id`=?" ) ;
+      Record arg( 2 ) ;
+      arg.assign_string( 1, component ) ;
+      arg.assign_string( 2, id.c_str() ) ;
+      Record r( v.first( arg ) ) ;
+      return r.value_string( 1 ) ;
+    }
+    catch( ... )
+    {
+      return L" " ;
+    }
+  }
+} ;
+
+#endif