dev-cpp-users

[Dev-C++] File handle

[Noorez K. <coo...@ho...>]

My program creates files and the names are what ever the user says. How can 
I test to see if a file already exists?

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[Dev-C++] File handle

[Noorez K. <coo...@ho...>]

I am having trouble doing file handling.

when opening the file i can use all the opening techinques except 
ios::nocreate and ios::noreplace.
All the other ones work fine but when i try to use those i get a compile 
error.

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Re: [Dev-C++] File handle

[Jesse H. <jes...@gm...>]

As per,

http://www.flipcode.com/cgi-bin/msg.cgi?showThread=00003660&forum=general&id=-1

ios::nocreate is only implemented in the old C++ runtime library --
<iostream.h>, rather than <iostream>.

There's a detailed list of implementation differences here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_core_differences_in_iostream_implementation.asp


(I presume this is the same situation with ios::noreplace) 

Cheerio!

On Mon, 21 Jun 2004 17:05:52 -0600, Noorez Kassam
<coo...@ho...> wrote:
> 
> I am having trouble doing file handling.
> 
> when opening the file i can use all the opening techinques except
> ios::nocreate and ios::noreplace.
> All the other ones work fine but when i try to use those i get a compile
> error.
> 
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-- 
Jesse Hallam
University of Waterloo Freshman

Re: [Dev-C++] File handle

[Zodiaq <zo...@as...>]

Hello Noorez and all Dev-C++ users,

Monday, June 21, 2004, 5:24:58 AM, Noorez wrote as follows:

NK> My program creates files and the names are what ever the user says. How can
NK> I test to see if a file already exists?

Duh, sample from Platform SDK:

HANDLE hFile;
char *szFileName;//this is the file name you want to check
...
...

BOOL bFileExists = TRUE;
hFile = CreateFile(szFileName,             // open some file
                GENERIC_READ,              // open for reading 
                FILE_SHARE_READ,           // share for reading 
                NULL,                      // no security 
                OPEN_EXISTING,             // existing file only 
                FILE_ATTRIBUTE_NORMAL,     // normal file 
                NULL);                     // no attr. template 
 
if( hFile == INVALID_HANDLE_VALUE )
{ 
  if( GetLastError( ) == ERROR_FILE_NOT_FOUND )
      bFileExists = FALSE;
  //in case of other errors file exists but it couldn't be opened for some
  reason, you can check for more system error codes
}
else
  CloseHandle( hFile );
  
-- 
regards, Zodiaq