Add debug output operator for IID

This file is the place for future similar additions.

Change-Id: Ibe168731ed97fe2366afb89409fe5ae2afa711e4

1 files changed, 41 insertions, 0 deletions

diff --git a/include/comphelper/windowsdebugoutput.hxx b/include/comphelper/windowsdebugoutput.hxx
new file mode 100644
index 000000000000..5efda11e7271
--- /dev/null
+++ b/include/comphelper/windowsdebugoutput.hxx
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* Debug output operators for Windows-specific types. For use in SAL_INFO(), SAL_WARN(), and
+ * friends. The exact format of the generated output is not guaranteed to be stable or contain
+ * complete information.
+ */
+
+#ifndef INCLUDED_COMPHELPER_WINDOWSDEBUGOUTPUT_HXX
+#define INCLUDED_COMPHELPER_WINDOWSDEBUGOUTPUT_HXX
+
+#include <ostream>
+#include <prewin.h>
+#include <postwin.h>
+#include <rtl/ustring.hxx>
+
+template <typename charT, typename traits>
+inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
+                                                     const IID& rIid)
+{
+    LPOLESTR pRiid;
+    if (StringFromIID(rIid, &pRiid) != S_OK)
+        return stream << "?";
+
+    // TODO: Maybe look up a descriptive name for the service or interface, from HKCR\CLSID or
+    // HKCR\Interface?
+
+    stream << OUString(reinterpret_cast<sal_Unicode*>(pRiid));
+    CoTaskMemFree(pRiid);
+    return stream;
+}
+
+#endif // INCLUDED_COMPHELPER_WINDOWSDEBUGOUTPUT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */