Added ScopedPrinterHandle

printing/backend/win_helper.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PRINTING_BACKEND_WIN_HELPER_H_
 #define PRINTING_BACKEND_WIN_HELPER_H_
 #pragma once
 
 #include <objidl.h>
 #include <winspool.h>
 #include <prntvpt.h>
 #include <xpsprint.h>
 
 #include "base/string16.h"
+#include "base/win/scoped_handle.h"
 #include "printing/printing_export.h"
 
 // These are helper functions for dealing with Windows Printing.
 namespace printing {
 
+class PrinterHandleTraits {
+ public:
+  static bool CloseHandle(HANDLE handle) {
+    return ::ClosePrinter(handle) != FALSE;
+  }
+};
+
+typedef base::win::GenericScopedHandle<PrinterHandleTraits> ScopedPrinterHandle;
+
+
 // Wrapper class to wrap the XPS APIs (PTxxx APIs). This is needed because these
 // APIs are not available by default on XP. We could delayload prntvpt.dll but
 // this would mean having to add that to every binary that links with
 // printing.lib (which is a LOT of binaries). So choosing the GetProcAddress
 // route instead).
 class PRINTING_EXPORT XPSModule {
  public:
   // All the other methods can ONLY be called after a successful call to Init.
   // Init can be called many times and by multiple threads.
   static bool Init();
@@ skipping 62 matching lines @@
       IXpsPrintJobStream **document_stream,
       IXpsPrintJobStream **print_ticket_stream);
  private:
   XPSPrintModule() { }
   static bool InitImpl();
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_BACKEND_WIN_HELPER_H_