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.NET Forum / Languages / Managed C++ / November 2005Changing the attributes for a hidden system file programmatically
Hi, I have a hidden system file that I need to read. I am logged in as an administrator. I can not change the file attributes using the windows explorer. I can view the file's content. Opening the file programmatically fails with access is denied. (If I copy the file I can access it, although it is also hidden.) Therefore I am trying to change the attributes of that file, programmatically, to normal. Getting the attributes succeeds and shows that the file is hidden and system. However when I try to set the file attribute to normal it fails and get last error produces the following string : Error 183 : Cannot create file when that file already exists. The MSDN states that for WinXP it is possible to change the attributes for hidden and system files. Do I need some special permissions ? Which ones ? I have logged off and logged in again, the behavior did not change. Any leads, anyone ? Thank you! You may have to remove the system-file attribute before being able to remove the regular attributes like hidden and readonly.  SignatureRegards, Nish [VC++ MVP] > Hi, > [quoted text clipped - 31 lines] > > Thank you! BTW I am talking about doing it via Explorer (which only allows you to set readonly and hidden). You'll have to use attrib.exe to set the system attribute. SignatureRegards, Nish [VC++ MVP] > You may have to remove the system-file attribute before being able to > remove the regular attributes like hidden and readonly. [quoted text clipped - 34 lines] >> >> Thank you! Just tried the attrib.exe. Same problem. Access denied. How can I find out what is preventing me from accessing that file ??? > BTW I am talking about doing it via Explorer (which only allows you to set > readonly and hidden). You'll have to use attrib.exe to set the system [quoted text clipped - 46 lines] > >> > >> Thank you! Looks like that file is in use. SignatureRegards, Nish [VC++ MVP] > Just tried the attrib.exe. > Same problem. [quoted text clipped - 54 lines] >> >> >> >> Thank you! Just tried the process explorer tool from sysinternals and it does not show that any process has a handle to my file... > Looks like that file is in use. > [quoted text clipped - 60 lines] > >> >> > >> >> Thank you! > I have a hidden system file that I need to read. > > I am logged in as an administrator. OK. > I can not change the file attributes using the windows explorer. > > I can view the file's content. OK. > Opening the file programmatically fails with access is denied. Important bits of information that you don't offer are the parameters to CreateFile(). Are you specifying an access mode of GENERIC_READ and a share mode of FILE_SHARE_READ? > (If I copy the file I can access it, although it is also hidden.) > [quoted text clipped - 8 lines] > > Error 183 : Cannot create file when that file already exists. Hmm. I think you'll need to post a _short_ snippet of code here that causes the error if the previous suggestion does not work for you. Regards, Will I am trying to open the file in write and read mode. This the code : DWORD attrs = GetFileAttributes((LPCSTR)path); attrs = FILE_ATTRIBUTE_NORMAL; if(SetFileAttributes((LPCSTR)path,attrs)) LogMessage("Set to FILE_ATTRIBUTE_NORMAL"); CFileException e; int res = file.Open(sPath + DBFileNewLocation,CFile::modeReadWrite,&e); > > I have a hidden system file that I need to read. > > [quoted text clipped - 32 lines] > Regards, > Will >I am trying to open the file in write and read mode. > This the code : [quoted text clipped - 6 lines] > CFileException e; > int res = file.Open(sPath + DBFileNewLocation,CFile::modeReadWrite,&e); Well, if understood your post correctly, you said that you were able to read the file interactively. You never said that you were able to _write_ interactively but rather that you were copying the file data to a new location. If I have that right, I'd suggest that you change CFile::modeReadWrite to CFile::modeRead. Regards, Will > Hi, > [quoted text clipped - 27 lines] > > I have logged off and logged in again, the behavior did not change. I think your real problem is that the file is in use by another program. Signature-GJC [MS Windows SDK MVP] -Software Consultant (Embedded systems and Real Time Controls) - http://www.mvps.org/ArcaneIncantations/consulting.htm -gchanson@mvps.org I have the same feeling. This file is used by a service which is logged in as a system account. However I have stopped the service, disabled it actually, logged out and logged in again. The service is disabled, stopped, I have checked. If I copy this file I can open the copy of that file... How can I find out if any other program is using that file ? Any suggestions you might have would be greatly appreciated... Thanks!!! > > Hi, > > [quoted text clipped - 35 lines] > - http://www.mvps.org/ArcaneIncantations/consulting.htm > -gchanson@mvps.org Use the process explorer tool from www.sysinternals.com to find out the process that is using the file. SignatureCheers Check Abdoul ----------------- > I have the same feeling. > This file is used by a service which is logged in as a system account. [quoted text clipped - 48 lines] > > - http://www.mvps.org/ArcaneIncantations/consulting.htm > > -gchanson@mvps.org According to this tool no process has the handle to my file... What else can it be ? > Use the process explorer tool from www.sysinternals.com to find out the > process that is using the file. [quoted text clipped - 59 lines] > > > - http://www.mvps.org/ArcaneIncantations/consulting.htm > > > -gchanson@mvps.org Check what permissions do you have on this file and who is the owner of the file. Even if you are using an administrator account you might not have necessary permissions on certain files. Good Luck, Max > Hi, > [quoted text clipped - 31 lines] > > Thank you! Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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