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How to prevent the opening of a file that does not exist [message #3774]

Sat, 24 June 2006 13:26

forlano
Messages: 1244
Registered: March 2006
Location: Italy

Senior Contributor

Hello,

I'm opening a file for reading purpose with:

FileIn in(filename);

I would like to know which is the best method (in.IsOK(), in.IsError(), ...) to prevent the case in which the file doesn't exist.

Thank you,
Luigi

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Re: How to prevent the opening of a file that does not exist [message #3775 is a reply to message #3774]

Sat, 24 June 2006 16:42

fudadmin
Messages: 1324
Registered: November 2005
Location: Kaunas, Lithuania

Ultimate Contributor
Administrator

forlano wrote on Sat, 24 June 2006 12:26

maybe this?

bool FileExists(const char *name)

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Re: How to prevent the opening of a file that does not exist [message #3776 is a reply to message #3775]

Sat, 24 June 2006 19:57

forlano
Messages: 1244
Registered: March 2006
Location: Italy

Senior Contributor

fudadmin wrote on Sat, 24 June 2006 16:42

maybe this?

bool FileExists(const char *name)

Maybe yes. But I wonder what I must use if I want to use the same pointer "in" to perform this operation after the file opening. What is the difference between in.IsOK() and in.IsError()?

Luigi

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Re: How to prevent the opening of a file that does not exist [message #3777 is a reply to message #3776]

Sat, 24 June 2006 20:10

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

IsOK == !IsError

Anyway, for FileIn, I tend to use operator bool:

FileIn in(...);
if(in) {
   // in was succesfuly opened
}

Actually, IsError is usually used at the end of write operation to find out whether always was written OK (e.g. there is enough capacity on target media, like:

FileOut out(...);
if(out) {
   ...write the stuff
   if(out.IsError())
      Exclamation("Error writing the file !");
}

Mirek

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