FileExists and UNC path

Question

I've noticed a strange behaviour of FileExists(const char path[], ssize_t **fileSize) function with UNC paths (\\<hostname>\<sharename>[\<objectname>]*):
if <hostname> is an alias of a non-existent host, FileExists returns 0 (File not found) - for example FileExists("\\\\server-name\\folder-name\\file.txt", NULL)
if <hostname> is an unreachable IP address, FileExists return -93 (UIEIOError) - for example FileExists("\\\\192.168.1.1\\folder-name\\file.txt", NULL)
This happens also if you try with the path to the same file, written with the host IP address and its corresponding alias, when the host becomes unreachable.
Tested with CVI 2009 SP1
Is this an expected behaviour?
Vix
In claris non fit interpretatio
Using LV 2013 SP1 on Win 7 64bit
Using LV 8.2.1 on WinXP SP3
Using CVI 2012 SP1 on Win 7 64bit, WinXP and WinXP Embedded
Using CVI 6.0 on Win2k, WinXP and WinXP Embedded

Answer 1

Hello Vix,
I've tried with either CVI 2009  Version 9.1.1 (450) and CVI 2009 Version 9.1.0 (428) and I always get 0 if the alias is bad or the IP is unreachable.
Here's the code I've run:
int ret=0;
ret=FileExists ("\\\\it-mil-wds01\\AEs\\pippo.txt", NULL);
printf("Il valore e' %d",ret);
getchar();
int ret=0;
ret=FileExists ("\\\\server\\AEs\\pippo.txt", NULL);
printf("Il valore e' %d",ret);
 getchar();
Can you give me your exact version of CVI?
Thanks,
Andrea
Andrea N.
Systems Engineer ATE & RF - Mediterranean Region
National Instruments Italy