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How to tell if a file is Open or is on readonly drive.

Posted on 1998-09-21
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Last Modified: 2010-04-06
I want to be able to check to see if a file is open or will return access denied prior to attempting to delete a file with SHFileOperation. Windows will popup a box and notify me of the access denied, which I want to avoid. Is there an easy to way to check if a file will return access denied prior to calling SHFileOperation?
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Question by:ripcord
3 Comments
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1340520
Hi

You could try to open the file exclusively first.
For example, for 'C:\Test.txt'

var
  f: TFileStream;
begin
  try
    f := TFileStream.Create('C:\Test.txt', fmOpenWrite or fmShareExclusive);
    f.Free;
    ShowMessage('The file can be deleted.');
  except
    ShowMessage('The file is in use by another process and cannot be deleted!');
  end;
end;

Regards,
JB
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LVL 7

Accepted Solution

by:
Motaz earned 200 total points
ID: 1340521
Hi, you can do that by this function :

function CanDelete(FileName:string):boolean;
var
    f:file;
begin
  AssignFile(f,FileName);
 FileMode:=2;  // Read and write access
 {$i-}
 Reset(f,1);
 CloseFile(f);
 {$i+}
 if IOResult=0 then
   Result:=true     // Can be deleted
  else  
   Result:=false;   // Access denied
end;
 
end;

Motaz from Sudan.
motaz1@yahoo.com
0
 
LVL 2

Expert Comment

by:kjteng
ID: 1340522
Another way is call the function
FileOpen(const FileName: string; Mode: Word)
eg.
i :=  FileOpen(sFile, fmOpenWrite or fmShareExclusive);
if the i<0 then
 {Cannot delete}
else
 {fileClose(i)

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