DELPHI : EEncodingError - Invalid code page on windows xp embedded

Question

Hi I have a application that works well on windows xp pro, windows Visa, windows 7

But when I run it on windows xp embedded it does not work and gives the following error:

EEncodingError - Invalid code page

When the App was made with Delphi 2006 it work on windows XP embedded

**When the App is made with Delphi 2010 it does **not work on windows XP embedded****

score 4 · Accepted Answer · answered Jun 10 '10 at 08:06

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The TEncoding.ASCII property uses codepage 20127, which is not installed on XP Embedded by default. You have to install it manually. The TEncoding class does not exist in D2006.

Are you using Indy 10, by chance? It uses TEncoding.ASCII by default for its string encodings. This exact error has been known to occur when using Indy on XP Embedded.

answered Jun 10 '10 at 08:06

Remy Lebeau

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Thanks - Enabling copepage 20127 - fixed the problem :) – Charles Faiga Jun 11 '10 at 09:49
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For what it is worth, Indy 10 no longer relies on codepages for its ASCII support. It implements its own `TIdASCIIEncoding` class internally. – Remy Lebeau Mar 29 '11 at 20:47

score 0 · Answer 2 · answered Jun 09 '10 at 16:51

0

When does it crash? On startup, or later?

That error is only found in one place, in the RTL at least. In SysUtils, constructor TMBCSEncoding.Create(CodePage, MBToWCharFlags, WCharToMBFlags: Integer);, which gets called by TEncoding to set up string encodings.

It takes the CodePage parameter and calls GetCPInfo on it, and if it fails it raises this exception. From the MSDN documentation and the exception message, what's probably going on is that your app is trying to use strings from a multibyte character set that's not supported by XP Embedded. Are you doing anything unusual with strings or text work in foreign languages that use a different alphabet?

answered Jun 09 '10 at 16:51

Mason Wheeler

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@Masson it crash OnStartup, I am doing nothing unusual+ all the text is in english – Charles Faiga Jun 09 '10 at 16:54
@Charles: Weird. Can you run BDS under XP Embedded? This sounds like a job for Delphi's debugger. – Mason Wheeler Jun 09 '10 at 17:11
@Charles - if it crashes before application.run, then it's likely something in the initialization section of a unit. And you say that the text is English, ok. But is this an English XP Embedded? That probably matters too. – Chris Thornton Jun 09 '10 at 17:12
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Also, try making a "hello, world" delphi project, and see if that runs on the embedded XP. That should cut your troubleshooting in half. – Chris Thornton Jun 09 '10 at 17:13
The call made is GetCPInfo(FCodePage, LCPInfo), where LCPInfo is a variable of type TCPInfo, which is a record. The GetCPInfo function expects a pointer to where it can write its output for the second parameter. So I would have expected the call to be GetCPInfo(FCodePage, @LCPInfo)? Not sure though why it then doesn't fail on non-embedded XP? – Marjan Venema Jun 09 '10 at 18:50
@Marjan: It's a Delphi idiom. When C code in a DLL expects a pointer to a value so it can modify it, as long as you don't need to pass it a **nil**, you can declare it as a **var** parameter instead of a pointer, and you end up with more readable code that way. If you look at GetCPInfo's declaration in Windows.pas, that's exactly what it does here. – Mason Wheeler Jun 09 '10 at 18:58
@Mason: Thanks for the explanation. I sometimes thinks Delphi shields us a little too much from the pointy things, but then again, I am glad it does... – Marjan Venema Jun 09 '10 at 19:39

DELPHI : EEncodingError - Invalid code page on windows xp embedded

2 Answers2