Making a file not accessible by other applications

[vasu_sri]

i am working an application that uses a file for some purpose. i am creating that file by using CreateFile() function. Now, i want to make sure that no other application uses that File till me application closes. i.e, i want no other application to access the file (not even for reading) as long as my application is running. how can i do this?

Regards, Srinivas

[prasad_som]

Use dwShareMode as NULL while using CreateFile API.

Prasad Notifier using ATL | Operator new[],delete[][^]

[Roger Stoltz]

In addition to what Prasad said: if you're using MFC and CFile, you should use the CFile::shareExclusive flag when opening the file. Read more here[^].

---

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

[vasu_sri]

No, it is not working for me. i don't know what mistake i am doing. here is the sample code of what i have written hFile = CreateFile ( strFileName,GENERIC_WRITE ,NULL,NULL,CREATE_ALWAYS ,FILE_ATTRIBUTE_NORMAL,NULL); after creation of the file, i write the data to that file. now i dont want any other application to access that File till i close my application. how can i do this? thanks..

Regards, Srinivas

[prasad_som]

vasu_sri wrote:

No, it is not working for me.

How you are verifying this.

vasu_sri wrote:

now i dont want any other application to access that File till i close my application.

Yes, by above code, no other application could access the file, till handle is closed.

vasu_sri wrote:

how can i do this?

Its already shown.

Prasad Notifier using ATL | Operator new[],delete[][^]

[DLChambers]

  HANDLE hFile = CreateFile(   
                 psFile,
                 GENERIC\_READ | GENERIC\_WRITE,
                 0,   // No sharing
                 NULL,
                 OPEN\_EXISTING,
                 FILE\_ATTRIBUTE\_NORMAL,
                 NULL);
  DWORD dwErr = GetLastError();
  // NOTE: Error 5 likely indicates file is marked read-only

...

  CloseHandle(hFile); // Unlock it