?
Solved

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

Posted on 1998-09-21
3
Medium Priority
?
187 Views
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?
0
Comment
Question by:ripcord
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
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
0
 
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)

0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses
Course of the Month14 days, 1 hour left to enroll

801 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question