Problem invoking the Unicode version of CryptEnumProviderTypes

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Stanimir Stamenkov - 09 Oct 2008 01:26 GMT

Not sure whether this is a suitable group for asking Win32 API
questions.

I'm trying the Cryptography examples from the MSDN Library and I
cannot get the "Example C Program: Enumerating CSP Providers and
Provider Types" [1] to work when compiled for Unicode character set.
Invoking CryptEnumProviderTypes the second time after the name
buffer size has been determined and allocated always results in
ERROR_MORE_DATA.

I get no such problem if I compile the example for Multi-byte
character set (that is using the ANSI versions of the Win32 API
functions). What I might be missing?

[1] http://msdn.microsoft.com/bg-bg/library/aa382359(en-us,VS.85).aspx

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Stanimir <stanio(_at_)gbg.bg>

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Stanimir Stamenkov - 10 Oct 2008 00:14 GMT

Thu, 09 Oct 2008 03:26:01 +0300, /Stanimir Stamenkov/:

> I'm trying the Cryptography examples from the MSDN Library and I cannot
> get the "Example C Program: Enumerating CSP Providers and Provider
[quoted text clipped - 7 lines]
>
> [1] http://msdn.microsoft.com/bg-bg/library/aa382359(en-us,VS.85).aspx

Just to add more info, comparing the cbName value between the
Unicode and ANSI versions after the first CryptEnumProviderTypes
call, it seems it correctly reports twice more bytes needed for the
Unicode version. Even if I allocate couple of kilobytes for pszName
(much more than cbName reports after the first call) I get the
ERROR_MORE_DATA on the second call.

FWIW, I'm on Windows XP SP3 using Visual Studio 2005 Standard Edition.

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Stanimir <stanio(_at_)gbg.bg>

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Mounir IDRASSI - 11 Oct 2008 12:39 GMT

Hi Stanimir,

This is a bug that was introduced in Windows XP SP3. I had the same problem
as you some time ago and I did many tests that showed that
CryptEnumProviderTypesW never returns the actual name value, returning
ERROR_MORE_DATA instead whenever we fill the pszTypeName parameter.

I didn't try to contact microsoft about but maybe we should since I'm not
the only one having this problem.

Cheers,

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Mounir IDRASSI
IDRIX
http://www.idrix.fr

To reach me: mounir_idrix_fr (replace the underscores with the at and dot
characters respectively)

> Thu, 09 Oct 2008 03:26:01 +0300, /Stanimir Stamenkov/:
>
[quoted text clipped - 18 lines]
>
> FWIW, I'm on Windows XP SP3 using Visual Studio 2005 Standard Edition.

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Stanimir Stamenkov - 12 Oct 2008 11:21 GMT

Sat, 11 Oct 2008 04:39:00 -0700, /Mounir IDRASSI/:

> This is a bug that was introduced in Windows XP SP3. I had the same problem
> as you some time ago and I did many tests that showed that
> CryptEnumProviderTypesW never returns the actual name value, returning
> ERROR_MORE_DATA instead whenever we fill the pszTypeName parameter.

Hello Mounir. Thanks for confirming the problem is not because of
my fault.

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Stanimir <stanio(_at_)gbg.bg>

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