From 8d11eeb3ade5963b4f85dc6dbc08586beec826d7 Mon Sep 17 00:00:00 2001
From: Antony Polukhin <antoshkka@gmail.com>
Date: Tue, 16 May 2017 10:28:56 +0300
Subject: [PATCH] Fix WinAPI missuse noted in #18 by pete-johnson

---
 include/boost/stacktrace/detail/safe_dump_win.ipp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/boost/stacktrace/detail/safe_dump_win.ipp b/include/boost/stacktrace/detail/safe_dump_win.ipp
index 2b4edab..26f0516 100644
--- a/include/boost/stacktrace/detail/safe_dump_win.ipp
+++ b/include/boost/stacktrace/detail/safe_dump_win.ipp
@@ -24,7 +24,11 @@
 namespace boost { namespace stacktrace { namespace detail {
 
 std::size_t dump(void* fd, const native_frame_ptr_t* frames, std::size_t frames_count) BOOST_NOEXCEPT {
-    if (!boost::detail::winapi::WriteFile(fd, frames, static_cast<boost::detail::winapi::DWORD_>(sizeof(native_frame_ptr_t) * frames_count), 0, 0)) {
+    boost::detail::winapi::DWORD_ written;
+    const boost::detail::winapi::DWORD_ bytes_to_write = static_cast<boost::detail::winapi::DWORD_>(
+        sizeof(native_frame_ptr_t) * frames_count
+    );
+    if (!boost::detail::winapi::WriteFile(fd, frames, bytes_to_write, &written, 0)) {
         return 0;
     }