Pour obtenir une clé
d'essai remplissez le formulaire ci-dessous
Demandez des tariffs
Nouvelle licence
Renouvellement de licence
--Sélectionnez la devise--
USD
EUR
RUB
* En cliquant sur ce bouton, vous acceptez notre politique de confidentialité

Free PVS-Studio license for Microsoft MVP specialists
To get the licence for your open-source project, please fill out this form
** En cliquant sur ce bouton, vous acceptez notre politique de confidentialité.

I am interested to try it on the platforms:
** En cliquant sur ce bouton, vous acceptez notre politique de confidentialité.

Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
>
V1060. Passing 'BSTR ' to the 'SysAlloc…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Problems related to code analyzer
Additional information
Contents

V1060. Passing 'BSTR ' to the 'SysAllocString' function may lead to incorrect object creation.

31 Jul 2020

The analyzer has detected the passing of a string of type 'BSTR' to the 'SysAllocString' function.

BSTR FirstBstr = ....;
BSTR SecondBstr = SysAllocString(FirstBstr);

Copying a 'BSTR' string by passing it to the 'SysAllocString' function may result in a logic error.

BSTR (basic string or binary string) is a string data type that is used by COM, Automation, and Interop functions. BSTR is represented in the following way:

  • Length prefix. A four-byte integer that contains the number of bytes in the following data string. It appears immediately before the first character of the data string and does not include the terminator.
  • Data string. A string of Unicode characters. May contain multiple embedded null characters.
  • Terminator. Two null characters.

A BSTR is a pointer that points to the first character of the string, not to the length prefix.

The 'SysAllocString' function handles 'BSTR' strings in the same way as it does regular wide C strings. It means that if the string contains multiple embedded null characters, 'SysAllocString' will return a truncated string. To avoid unexpected behavior, rewrite the code using wrapper classes over 'BSTR' such as 'CComBSTR' or '_bstr_t'.

For example, you can use the following pattern to correctly copy one 'BSTR' string to another:

CComBstr firstBstr(L"I am a happy BSTR.");
BSTR secoundBstr = firstBstr.Copy();

This is another way to do it:

_bstr_t firstBstr(L"I am a happy BSTR too.");
BSTR secoundBstr = firstBstr.copy();
Unicorn with delicious cookie
Nous utilisons des cookies pour améliorer votre expérience de navigation. En savoir plus
Accepter