Save and restore the value of GetLastError() when [D]LOG/[D]CHECK etc on Windows.
Also for log levels higher than INFO, the value of GLE is tagged onto the log message.
Review URL: http://codereview.chromium.org/73010
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@13667 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/logging.h b/base/logging.h
index b3bba0b..6a58cf31 100644
--- a/base/logging.h
+++ b/base/logging.h
@@ -540,6 +540,25 @@
std::ostringstream stream_;
size_t message_start_; // Offset of the start of the message (past prefix
// info).
+#if defined(OS_WIN)
+ // Stores the current value of GetLastError in the constructor and restores
+ // it in the destructor by calling SetLastError.
+ // This is useful since the LogMessage class uses a lot of Win32 calls
+ // that will lose the value of GLE and the code that called the log function
+ // will have lost the thread error value when the log call returns.
+ class SaveLastError {
+ public:
+ SaveLastError();
+ ~SaveLastError();
+
+ unsigned long get_error() const { return last_error_; }
+
+ protected:
+ unsigned long last_error_;
+ };
+
+ SaveLastError last_error_;
+#endif
DISALLOW_COPY_AND_ASSIGN(LogMessage);
};
