🚀 go-pugleaf

On Tue, 6 May 2003 19:52:54 +0800, "Sky" <akeehuang@163.net> wrote:

>hi all,
>I want to know whether a file or directory is existed or not?
>not use VCL, I know the FileExists/DirectoryExists in VCL.

bool __fastcall MyDirExists(const AnsiString ADir)
{
    bool  Result = false;
    DWORD AAttr  = ::GetFileAttributes(ADir.c_str());

    if (AAttr != 0xFFFFFFFF)
    {
        if ((AAttr & FILE_ATTRIBUTE_DIRECTORY) != 0)
        Result = true;
    }

    return Result;
}

bool __fastcall MyFileExists(const AnsiString AFile)
{
    bool            Result = false;
    WIN32_FIND_DATA FD;
    HANDLE          Handle = FindFirstFile(AFile.c_str(),&FD);

    if (Handle != INVALID_HANDLE_VALUE)
    {
        ::FindClose(Handle);

        if ((FD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
        Result = true;
    }

    return Result;
}

-- 

Nick B. Cassos

Thanks!

There are possible problems with this answer.

First, you need to test the string for the presence of * or ?.  If either of
those characters exist then you may get what amounts to a false positive.

Also, watch out for filenames such as nul, prn, con, etc.

Second, you may have problems with network drives.  I have had problems with
them and I never found a satisfactory solution.  On the network I was
working on, a particular test would work; however, I would get false
positives on my customer's network.  Some networks identified a file as
existing when it didn't.  Some identified a folder as a file.  It was messy.

I'm afraid I do not remember the particulars of what I had trouble with and
what I did to fix it.

Greg
"Nick B. Cassos" <nbc@no_spam.ath.forthnet.gr> wrote in message
news:encfbvo8rr3i96t9llc1mbo2917lb8vhda@4ax.com...
> On Tue, 6 May 2003 19:52:54 +0800, "Sky" <akeehuang@163.net> wrote:
>
> >hi all,
> >I want to know whether a file or directory is existed or not?
> >not use VCL, I know the FileExists/DirectoryExists in VCL.
>
> bool __fastcall MyDirExists(const AnsiString ADir)
> {
>     bool  Result = false;
>     DWORD AAttr  = ::GetFileAttributes(ADir.c_str());
>
>     if (AAttr != 0xFFFFFFFF)
>     {
>         if ((AAttr & FILE_ATTRIBUTE_DIRECTORY) != 0)
>         Result = true;
>     }
>
>     return Result;
> }
>
> bool __fastcall MyFileExists(const AnsiString AFile)
> {
>     bool            Result = false;
>     WIN32_FIND_DATA FD;
>     HANDLE          Handle = FindFirstFile(AFile.c_str(),&FD);
>
>     if (Handle != INVALID_HANDLE_VALUE)
>     {
>         ::FindClose(Handle);
>
>         if ((FD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
>         Result = true;
>     }
>
>     return Result;
> }
>
> --
>
> Nick B. Cassos

"Sky" <akeehuang@163.net> wrote:
> [...] a file or directory is existed or not? not use VCL,

Use access:

       access: determines accessibility of a file
       int access(const char *filename, int amode);

       amode = 0 checks for file existence
       amode = 2 checks for write permission

If the requested access is allowed, 0 is returned; otherwise, a
value of -1 is returned and errno is set.

~ JD

I think the simplest (and portable) way of doing that is via the method
described by JD
Alternatively you can use this code
http://www.geocities.com/rodolfofrino/FileExists.html
which also works under UNIX

Rodolfo
Stargate Software

"Sky" <akeehuang@163.net> wrote in message
news:3eb7a237@newsgroups.borland.com...
> hi all,
> I want to know whether a file or directory is existed or not?
> not use VCL, I know the FileExists/DirectoryExists in VCL.
> great appreciated if any hint.
>
> Sky
> 2003-5-6
>
>