Error Code Portal
MicrosoftWindows Win32Warning or status code

997

ERROR_IO_PENDING

Alternative forms: 0x000003E5 · 0x3E5 · ERROR_IO_PENDING · 0x800703E5

What does this code mean?

Code 997 · An issue reported by Windows Win32.

This entry includes warnings or status values that are not errors. Check the original documentation for the conditions under which they are returned.

Official explanation · Original text

Overlapped I/O operation is in progress.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (500-999) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices