_buf_size is not a member of _iobuf

Question

Asha Diggi 96

Hi All,

I am trying to build my VC++ 2010 application in VC++ 2015,

After building getting a error message "_buf_size is not a member of _io_size"

but before the same Application is running on VC++ 2010...

what is meaning of that error and how do I solve in VC++ 2015...

Regards,
Asha.

David Lowndes 4,541 Reputation points MVP

2021-07-14T08:02:02.803+00:00

I'm guessing that your code relied on some undocumented internal implementation that's now changed.
You'll need to show a simple repro before anyone can do other than guess though.
RLWA32 30,216 Reputation points

2021-07-14T09:09:47.58+00:00

As @David Lowndes indicated there were changes to the CRT between VC++ 2010 and VC++2015. In fact, the changes were a complete refactoring and broke any old code that relied on undocumented features of the VC++ 2010 CRT. You can read more at upgrade-your-code-to-the-universal-crt and the older the-great-c-runtime-crt-refactoring

David Lowndes 4,541 Reputation points MVP

2021-07-14T08:02:02.803+00:00

I'm guessing that your code relied on some undocumented internal implementation that's now changed.
You'll need to show a simple repro before anyone can do other than guess though.
RLWA32 30,216 Reputation points

2021-07-14T09:09:47.58+00:00

As @David Lowndes indicated there were changes to the CRT between VC++ 2010 and VC++2015. In fact, the changes were a complete refactoring and broke any old code that relied on undocumented features of the VC++ 2010 CRT. You can read more at upgrade-your-code-to-the-universal-crt and the older the-great-c-runtime-crt-refactoring