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Report From: Delphi-BCB/RTL/Delphi/File Management [ Add a report in this area ]

Report #: 65522

Status: Closed

TMemoryStream.LoadFromFile throws "Stream read error"

Project: Delphi

Build #: 11.0.2902.10471

Version: 11.2

Submitted By: Yahoo Serious

Report Type: Basic functionality failure

Date Reported: 8/11/2008 6:12:22 AM

Severity: Extreme corner case

Last Updated: 3/20/2012 2:24:39 AM

Platform: All versions

Internal Tracking #: 263933

Resolution: Fixed (Resolution Comments)

Resolved in Build: : 15.0.3577.25507

Duplicate of: None

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Description

I encountered a "Stream read error" using TMemoryStream.LoadFromFile. It was non-deterministic (sometimes it was thrown, sometimes it wasn't.)

Some searching led me to a newsgroup-message:
borland.public.delphi.vcl.components.using.win32
Re: Help! Stream-Read-Error on TMemoryStream.LoadFromFile
Remy Lebeau (TeamB) [Jun 3 2004, 19:34]

Where Gambit explains:
"if it [TMemoryStream] doesn't read the full data in one try, it throws an exception."

I think this asks for a better error description than "Stream read error", e.g. mentioning the file and/or the file size.
Besides, I think this would call for better handling, e.g. using TMemoryStream.CopyFrom like Gambit suggests.

Steps to Reproduce:

Use TMemoryStream.LoadFromFile with a large file (mine is appr. 94 MB)

Workarounds

Use TFileStream.LoadFromFile and TMemoryStream.CopyFrom(TFileStream) like Gambit suggests?

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