BUG: _lread() Functions Incorrectly When No Floppy in Drive

 Last reviewed: January 5, 1995
Article ID: Q111587
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK) for Windows version 3.1

SYMPTOMS

Using the function _lread() to read a floppy disk when there is no disk in the floppy drive results in the System error-message box "Cannot Read from Drive..." with Retry and Cancel buttons. If the Cancel button is clicked, _lread() returns, indicating incorrectly that it read the number of bytes requested. Instead, it should return -1, indicating failure.

RESOLUTION

Before calling _lread(), call SetErrorMode() in your application to disable the default Windows Critical Error Handler so that the system error-message box will not be displayed. The _lread() function will correctly return -1, indicating failure.

STATUS

Microsoft has confirmed this to be a bug in Windows version 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional reference words: buglist3.10 3.10 int24
KBCategory: kbprg kbbuglist
KBSubcategory: KrFileIO

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Last reviewed: January 5, 1995
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