Entry No.
676
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VCL - General - IniFiles - TIniFile
In TIniFile.ReadString, passing a default argument that ends in a space
character causes an "invalid page fault in module KRNL386.EXE at
0002:00005c83".
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| 1.02 |
2.01 |
3.0 |
3.01 |
3.02 |
4.0 |
4.01 |
4.02 |
4.03 |
5.0 |
5.01 |
6.0 |
6.01 |
6.02 |
Kylix 1.0 |
| Absent | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | Gotcha | N/A |
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Description | |
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Reported by Frank Wittl; checked by Jordan Russell
See also bug #424.
The bug can be reliably reproduced with the following code attempting to
read a INI entry that does not exist:
IniString := IniFile.ReadString('Test', 'TestString', ' ');
Note that the default argument character in the third parameter is a ' '
(space). Deleting the ' ' ends the problem.
Some other notes:
- This bug is Windows version dependent: Windows 95 and 98 have the bug,
but NT 4.0 SP6 and WIN2K does not have it.
- This bug has been reproduced in Delphi 5 (with SP1) and Delphi 6.
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User-contributed comments | |
Space Case
11 Jul 2001 03:08 PM GMT |
Actually, this entry's header should probably read "...ends with a space..." rather than "...contains a space...", based on the results of tests I've just run (D3.02 on Win98)!
anonymous
28 Nov 2001 09:36 PM GMT |
This in the end is a bug in Microsoft Windows.
<quote MSDN>
Avoid specifying a default string with trailing blank characters. The function inserts a null character in the lpReturnedString buffer to strip any trailing blanks.
Windows 95/98/Me: Although lpDefault is declared as a constant parameter, the system strips any trailing blanks by inserting a null character into the lpDefault string before copying it to the lpReturnedString buffer.
</quote>
When
IniFile.ReadString('Test', 'TestString', ' ');
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is called then the default item ' ' resides in write-protected virtual memory. Windows BlowMeUpScotty will try to write to that - end of story.
Borland could theoretically work around this defect by creating a temporary default string in writable memory - but the generally erratic behaviour of Windows 95/98/Me cannot be fixed.
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