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List:       ms-cryptoapi
Subject:    Re: Retrieving data of unknown length
From:       Takenaka Kenji <ngb73012 () BIGLOBE ! NE ! JP>
Date:       2002-11-25 12:35:07
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Hi Martin,

As it is mentioned in MSDN, I set up a pointer to point at the
data length in pdwDataLen (LPDWORD). When I test follow
case, an error happens.

(1) When I get a data length by the CryptGetKeyParam call of PropCert.

(2) When I try No.4 of S/MIME(CryptGetHashParam call) of
     "The Smart Card Cryptographic Service Provider Cookbook".

Do you know why these error happen?

Thanks!

Takenaka Kenji


On 2002.11.20, at 21:24, Leung Ming Tak wrote:

> Hi Takenaka,
>
> Takenaka Kenji wrote:
>
>> Hi!
>>
>> I want to retrieve data of unknown length.
>> I can get a data length by the CryptSignHash call.
>> But, ERROR_INVALID_PARAMETER is being returned when it is set up in
>> pbData=NULL and pdwDataLen=0 by the GetKeyParam call.
>> Why?
>
> pdwDataLen should not be 0. It should be a pointer to dword for
> receiving the return len.
>
> Rgds.
> Martin
>
>>
>> Thanks!
>>
>>  Takenaka Kenji
>>
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