C / C++ / MFC Discussion Boards

Re: DeviceIoControl to lock drive is not working

Patcher3222-Oct-09 13:12

22-Oct-09 13:12

Yes hVolume is right value. GetLastError returns 0.
GENERIC_READ already has FILE_READ_ATTRIBUTES
Tried using 0 for File sharing but still DeviceIoControl gives error 87 parameter not correct
Thanks for replying, I appreciate it.

Re: DeviceIoControl to lock drive is not working

Code-o-mat22-Oct-09 5:52

Code-o-mat

22-Oct-09 5:52

Are you completely sure about F:?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: DeviceIoControl to lock drive is not working

Patcher3222-Oct-09 13:13

Patcher32

22-Oct-09 13:13

Yes my DVD drive is F:. and handle returned by CreateFile is valid too.
Thanks for replying

Re: DeviceIoControl to lock drive is not working

David Crow22-Oct-09 6:20

David Crow

22-Oct-09 6:20

Patcher32 wrote:
PREVENT_MEDIA_REMOVAL pmr;

Isn't this used with IOCTL_STORAGE_MEDIA_REMOVAL?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: DeviceIoControl to lock drive is not working

Code-o-mat22-Oct-09 6:34

Code-o-mat

22-Oct-09 6:34

According to this[^] it is also used with IOCTL_STORAGE_EJECTION_CONTROL.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: DeviceIoControl to lock drive is not working

David Crow22-Oct-09 6:56

David Crow

22-Oct-09 6:56

Two MSDN sites that contradict each other. No surprise there!

Re: DeviceIoControl to lock drive is not working

Patcher3222-Oct-09 13:44

Patcher32

22-Oct-09 13:44

Okay I finally got it to work. YAY! Smile | :)

I made this change : pmr.PreventMediaRemoval = (BYTE)TRUE; in the original code I posted.

But MSDN says the PreventMediaRemoval member is BOOLEAN? Thanks for confusing me MSDN! Mad | :mad:

The value has to be BYTE. So setting it to 1 locks drive from being ejected. Setting it to 0 unlocks the drive from ejecting.

Re: DeviceIoControl to lock drive is not working

Covean22-Oct-09 20:59

Covean

22-Oct-09 20:59

"But MSDN says the PreventMediaRemoval member is BOOLEAN? Thanks for confusing me MSDN!"

MSDN is right the problem is, that TRUE is a 32 Bit-Value (TRUE and true are not the same). So you send the value 0(FALSE) to your drive. And if I'm right, the function fails if you try to unlock drive you never locked before.

Re: DeviceIoControl to lock drive is not working

Patcher3223-Oct-09 19:22

Patcher32

23-Oct-09 19:22

If I lock with (BYTE)TRUE : works
If I unlock a locked device using (BYTE)FALSE : works
If I try to unlock a device (without locking it first) using (BYTE)FALSE : gives error #22, The device does not recognize command

I think this is expected behavior. Please guide me in right direction if I am doing it wrong.

Renaming file in C++ failing

StrayGrey22-Oct-09 3:58

StrayGrey

22-Oct-09 3:58

I have a C++ program running on Windows XP compiled with Visual C++ 6.0 containing the following code
[code]
if (remove(NewName) != 0)
{
errmsg = strerror(errno);
printf("Removal Error: %s\n", errmsg);
}

if (rename(FileName,NewName) != 0)
{
errmsg = strerror(errno);
printf("Rename Error: %s\n", errmsg);
}
[/code]

and this fails, offering to send a message to Microsoft about the error of my ways.
The file I want to rename(FileName) does exist and the file I want to rename it to(NewName) does not and none of my error messages appear.
Please make suggestions on how I should fix this.

Regards,
Alf Stockton

Re: Renaming file in C++ failing

David Crow22-Oct-09 4:06

David Crow

22-Oct-09 4:06

StrayGrey wrote:
if (remove(NewName) != 0)

What does remove() return?

StrayGrey wrote:
errmsg = strerror(errno);

How is errmsg declared?

Hve you tried DeleteFile() or SHFileOperation()?

Re: Renaming file in C++ failing

StrayGrey22-Oct-09 4:20

StrayGrey

22-Oct-09 4:20

I apparently do not get anything back from remove()

errmsg is defined as
char *errmsg;

Regards,
Alf Stockton

Re: Renaming file in C++ failing

Michael Schubert22-Oct-09 4:12

Michael Schubert

22-Oct-09 4:12

Have you used the debugger? What types are NewName and FileName?

Re: Renaming file in C++ failing

StrayGrey22-Oct-09 4:17

StrayGrey

22-Oct-09 4:17

I have them defined as:-
char *FileName = "";

char *NewName = "";

Regards,
Alf Stockton

Re: Renaming file in C++ failing

Michael Schubert22-Oct-09 4:22

Michael Schubert

22-Oct-09 4:22

Again, have you used the debugger? Do FileName and NewName contain valid file names (and paths)?

Re: Renaming file in C++ failing

StrayGrey22-Oct-09 5:08

StrayGrey

22-Oct-09 5:08

The trick that has worked for me is not to define the file names as pointers but rather as arrays.

Regards,
Alf Stockton

Re: Renaming file in C++ failing

David Crow22-Oct-09 6:05

David Crow

22-Oct-09 6:05

Whether you use

char *NewName = "c:\\somefile.txt";
remove(NewName);

char NewName[] = "c:\\somefile.txt";
remove(NewName);

they both work.

Re: Renaming file in C++ failing

Richard MacCutchan22-Oct-09 4:50

Richard MacCutchan

22-Oct-09 4:50

I have just run this code and it works fine, so I suspect there is some part that you have not shown that is actually failing. Can you post the full program (assuming it's not hundreds of lines)? Also please surround it with <pre></pre> tags to keep it formatted properly, use the code block button at the top of the edit window.

Re: Renaming file in C++ failing

StrayGrey22-Oct-09 5:10

StrayGrey

22-Oct-09 5:10

Name file variables as arrays not pointers.

Regards,
Alf Stockton

Delaying Shutdown through windows service and executing scripts ?

Kushagra Tiwari22-Oct-09 2:45

Kushagra Tiwari

22-Oct-09 2:45

Hello All,

I am working on a project where I need to catch the windows shutdown event through a windows service running in system account, delay shutdown and execute some shutdown scripts and then once the scripts have been completed the shutdown continues.Kindly suggest me some ways to do this via a windows service developed by me in C++.

Regards,
Kushagra

I hate coding but I luv to develop Smile | :)

Re: Delaying Shutdown through windows service and executing scripts ?

David Crow22-Oct-09 3:02

David Crow

22-Oct-09 3:02

Have you tried creating a hidden window and handling the WM_QUERYENDSESSION message? You may need to turn on the "Allow Service to Interact With Desktop" option.

Re: Delaying Shutdown through windows service and executing scripts ?

Randor 22-Oct-09 3:08

Randor

22-Oct-09 3:08

Did you try my suggestions from when you asked this question in September 2009[^]?

Best Wishes,
-David Delaune

Re: Delaying Shutdown through windows service and executing scripts ?

Kushagra Tiwari22-Oct-09 3:24

Kushagra Tiwari

22-Oct-09 3:24

Hello David,

I definitely had tried the the function but some how it doesnt seem to work for me.Can you detail me exactly what steps have to be followed in achieving the same.

Regards,
Kushagra

Re: Delaying Shutdown through windows service and executing scripts ?

Randor 22-Oct-09 3:30

Randor

22-Oct-09 3:30

Kushagra Tiwari wrote:
Can you detail me exactly what steps have to be followed in achieving the same.

First can you tell me what operating system will be hosting the Windows service?

Best Wishes,
-David Delaune

Re: Delaying Shutdown through windows service and executing scripts ?

Kushagra Tiwari22-Oct-09 3:39

Kushagra Tiwari

22-Oct-09 3:39

I have to run this in all operating systems namely Windows XP, Windows Server 2003& 2008, Windows Vista,Windows 7. I tried it presently on XP , but the application is meant to be supporting all flavours of Windows after NT
Regards,
Kushagra

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