Re: cgets bug?

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Hey Charles .. Turns out the workaround causes a problem ... in cwtomb.c,
line 93:

_VALIDATE_RETURN_ERRCODE(sizeInBytes >0, ERANGE);

Fails because SizeInBytes is zero (it happens when calling _cgetts_s with a
length of two (enter Y) then on the next cgets of the normal size it bombs
out on the reading of the single char).




"Charles Wang[MSFT]" <changliw@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:IvX5cAKYHHA.1352@xxxxxxxxxxxxxxxxxxxxxxxxx
Hi, David,
Thanks for your response.
The issue had been in our internal bug list, so I said that it was a
confirmed product by design issue. Unfortunately from the internal log,
there was no plan for fixing this issue now. That is why I recommend that
you use other method. If ANSI is not neccessary in your requirement, you
may use Unicode character set to build you application.

Anyway, I report it again via http://connect.microsoft.com. Please refer
to:
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedba
ckID=262098

Also, from my test, I found a workaround to resolve this issue by adding
an
additional line of _cgetts_s after the first _cgetts_s function when your
application is build with NON-UNICODE character set. Please refer to:
TCHAR b[128];
b[(sizeof(b)/sizeof(b[0]))-1]=0;
size_t br;
int i=0;
do {
_tprintf(_T("Enter Something>"));
#ifdef _UNICODE
_cgetts_s(b, sizeof(b)/sizeof(b[0]), &br);
#else
TCHAR chrend[1];
_cgetts_s(b, sizeof(b)/sizeof(b[0]), &br);
_cgetts_s(chrend, sizeof(chrend)/sizeof(chrend[0]), &br);
#endif
} while (br==0);

For your question, "I tried flush the buffer via checking for kbhit() but
it doesn't show up ..
must be buffered somewhere else? ", I think that the _cgetts_s input
buffer
may be different from standard input buffer and kbhit() or other flushing
buffer functions could not clear it. Unfortunately this is undocumented.

Hope this helps. If you have any other questions or concerns, please feel
free to let me know.
Have a good day!

Charles Wang
Microsoft Online Community Support
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