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-rw-r--r--zen/file_io.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/zen/file_io.cpp b/zen/file_io.cpp
index 6581dfbe..4961cac9 100644
--- a/zen/file_io.cpp
+++ b/zen/file_io.cpp
@@ -291,7 +291,7 @@ FileOutput::~FileOutput()
void FileOutput::write(const void* buffer, size_t bytesToWrite) //throw FileError
{
#ifdef FFS_WIN
- DWORD bytesWritten = 0;
+ DWORD bytesWritten = 0; //this parameter is NOT optional: http://blogs.msdn.com/b/oldnewthing/archive/2013/04/04/10407417.aspx
if (!::WriteFile(fileHandle, //__in HANDLE hFile,
buffer, //__out LPVOID lpBuffer,
static_cast<DWORD>(bytesToWrite), //__in DWORD nNumberOfBytesToWrite,
bgstack15