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Posted: **Wed Nov 04, 2015 2:14 am**

Fantastic Pete!

Posted: **Wed Nov 04, 2015 8:01 am**

PeteWG wrote:Hi,

try the code below to see if it serves your purpose:

...

regards,
Pete

Hi Pete,

Thanks for sharing! It works fine at Win 7 here

Please take a look for an updated C-code without the warnings below:

#pragma BEGINDUMP

#include <windows.h>
#include <winioctl.h>
#include <tchar.h>
#include <stdio.h>

#include "hbapi.h"

/* Prototypes
BOOL EjectVolume(TCHAR cDriveLetter);
HANDLE OpenVolume(TCHAR cDriveLetter);
BOOL LockVolume(HANDLE hVolume);
BOOL DismountVolume(HANDLE hVolume);
BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPrevent);
BOOL AutoEjectVolume(HANDLE hVolume);
BOOL CloseVolume(HANDLE hVolume);
*/
LPTSTR szVolumeFormat = TEXT("\\\\.\\%c:");
LPTSTR szRootFormat = TEXT("%c:\\");

HANDLE OpenVolume(TCHAR cDriveLetter)
{
   HANDLE hVolume;
   UINT uDriveType;
   TCHAR szVolumeName[8];
   TCHAR szRootName[5];
   DWORD dwAccessFlags;

   wsprintf(szRootName, szRootFormat, cDriveLetter);
   uDriveType = GetDriveType(szRootName);

   switch(uDriveType) 
   {
   case DRIVE_REMOVABLE:
     dwAccessFlags = GENERIC_READ | GENERIC_WRITE;
     break;
   case DRIVE_CDROM:
     dwAccessFlags = GENERIC_READ;
     break;
   default:
     return INVALID_HANDLE_VALUE;
   }

   wsprintf(szVolumeName, szVolumeFormat, cDriveLetter);

   hVolume = CreateFile(   szVolumeName,
                         dwAccessFlags,
                         FILE_SHARE_READ | FILE_SHARE_WRITE,
                         NULL,
                         OPEN_EXISTING,
                         0,
                         NULL );
   return hVolume;
}

BOOL CloseVolume(HANDLE hVolume)
{
   return CloseHandle(hVolume);
}

#define LOCK_TIMEOUT        10000       // 10 Seconds
#define LOCK_RETRIES        20

BOOL LockVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   DWORD dwSleepAmount;
   int nTryCount;

   dwSleepAmount = LOCK_TIMEOUT / LOCK_RETRIES;

   for( nTryCount = 0; nTryCount < LOCK_RETRIES; nTryCount++ ) 
   {
     if( DeviceIoControl( hVolume, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0,
                          &dwBytesReturned, NULL ) )
         return TRUE;

     Sleep( dwSleepAmount );
   }

   return FALSE;
}

BOOL DismountVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   return DeviceIoControl( hVolume, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL, 0,
                           &dwBytesReturned, NULL );
}

BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPreventRemoval)
{
   DWORD dwBytesReturned;
   PREVENT_MEDIA_REMOVAL PMRBuffer;
   PMRBuffer.PreventMediaRemoval = fPreventRemoval;
   return DeviceIoControl( hVolume, IOCTL_STORAGE_MEDIA_REMOVAL,
                           &PMRBuffer, sizeof(PREVENT_MEDIA_REMOVAL),
                           NULL, 0, &dwBytesReturned, NULL );
}

BOOL AutoEjectVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   return DeviceIoControl( hVolume, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0,
                         &dwBytesReturned,
                         NULL );
}

BOOL EjectVolume( TCHAR cDriveLetter )
{
   HANDLE hVolume;

   BOOL fRemoveSafely = FALSE;
   BOOL fAutoEject = FALSE;

   hVolume = OpenVolume(cDriveLetter);
   if( hVolume == INVALID_HANDLE_VALUE )
     return FALSE;

   if( LockVolume(hVolume) && DismountVolume(hVolume) )
   {
     fRemoveSafely = TRUE;

     if ( PreventRemovalOfVolume(hVolume, FALSE) && AutoEjectVolume(hVolume) )
         fAutoEject = TRUE;
   }

   if( ! CloseVolume(hVolume) )
     return FALSE;

   return ( fRemoveSafely && fAutoEject );
}

HB_FUNC( EJECTREMOVABLE )
{ 
   char * szDrive = (char *) hb_parc( 1 );

   hb_retl( EjectVolume( *szDrive ) ); 
}

#pragma ENDDUMP

Thanks again!

Posted: **Wed Nov 04, 2015 8:14 am**

Thanks Grigory !

Serge

Posted: **Wed Nov 04, 2015 9:01 am**

It works great on Win7 64bit Prof.
Thanks!

Posted: **Wed Nov 04, 2015 9:38 am**

Hi pete,
It is also possible to enable later the same drive (or a drive)
How to become disconnect a map network drive
How to become enable it
Thank you again

Posted: **Wed Nov 04, 2015 11:05 am**

Hi,

(thanks for any "thanks" <g>)

@grigory
Well, the code i posted was of a "quick and dirty" kind.

I think, I had spotted the warnings but I (lazy!) cared not to pacify them;
it's nice that you took the time to do it.

Furthermore, the 1st version of the function was not only "warning-fraught", but also incomplete. (however, it did the job..)
Below is the 2nd version, enriched with one more operation: to notify Explorer that the disk has been removed, to stop displaying it (in case of USB), in the pane.

Code: Select all

// test program
request hb_gt_win_default
PROC MAIN( cDriveLetter )

	hb_Default( @cDriveLetter, "G:" )

	IF EjectRemovable( cDriveLetter )
		? "The drive " + cDriveLetter + " can be safely removed."
	ELSE
		? "Failed to safely remove/eject drive " + cDriveLetter
	ENDIF
	WAIT
	RETURN
// end test program

#pragma BEGINDUMP

#include <windows.h>
#include <winioctl.h>
#include <tchar.h>
#include <stdio.h>
#include <Shlobj.h>

// Prototypes
BOOL EjectVolume(TCHAR cDriveLetter);
HANDLE OpenVolume(TCHAR cDriveLetter);
BOOL LockVolume(HANDLE hVolume);
BOOL DismountVolume(HANDLE hVolume);
BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPrevent);
BOOL AutoEjectVolume(HANDLE hVolume);
BOOL CloseVolume(HANDLE hVolume);

LPTSTR szVolumeFormat = TEXT("\\\\.\\%c:");
LPTSTR szRootFormat = TEXT("%c:\\");

HANDLE OpenVolume(TCHAR cDriveLetter)
{
   HANDLE hVolume;
   UINT uDriveType;
   TCHAR szVolumeName[8];
   TCHAR szRootName[5];
   DWORD dwAccessFlags;

   wsprintf(szRootName, szRootFormat, cDriveLetter);
   uDriveType = GetDriveType(szRootName);

   switch(uDriveType)
   {
   case DRIVE_REMOVABLE:
     dwAccessFlags = GENERIC_READ | GENERIC_WRITE;
     break;
   case DRIVE_CDROM:
     dwAccessFlags = GENERIC_READ;
     break;
   default:
     return INVALID_HANDLE_VALUE;
   }

   wsprintf(szVolumeName, szVolumeFormat, cDriveLetter);

   hVolume = CreateFile(   szVolumeName,
                         dwAccessFlags,
                         FILE_SHARE_READ | FILE_SHARE_WRITE,
                         NULL,
                         OPEN_EXISTING,
                         0,
                         NULL );
   return hVolume;
}

BOOL CloseVolume(HANDLE hVolume)
{
   return CloseHandle(hVolume);
}

#define LOCK_TIMEOUT        10000       // 10 Seconds
#define LOCK_RETRIES        20

BOOL LockVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   DWORD dwSleepAmount;
   int nTryCount;

   dwSleepAmount = LOCK_TIMEOUT / LOCK_RETRIES;

   for( nTryCount = 0; nTryCount < LOCK_RETRIES; nTryCount++ )
   {
     if( DeviceIoControl( hVolume, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0,
                          &dwBytesReturned, NULL ) )
         return TRUE;

     Sleep( dwSleepAmount );
   }

   return FALSE;
}

BOOL DismountVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   return DeviceIoControl( hVolume, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL, 0,
                           &dwBytesReturned, NULL );
}

BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPreventRemoval)
{
   DWORD dwBytesReturned;
   PREVENT_MEDIA_REMOVAL PMRBuffer;
   PMRBuffer.PreventMediaRemoval = fPreventRemoval;
	
   return DeviceIoControl( hVolume, IOCTL_STORAGE_MEDIA_REMOVAL,
                           &PMRBuffer, sizeof(PREVENT_MEDIA_REMOVAL),
                           NULL, 0, &dwBytesReturned, NULL );
}

BOOL AutoEjectVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
	
   return DeviceIoControl( hVolume, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0,
                           &dwBytesReturned, NULL );
}

BOOL EjectVolume( TCHAR cDriveLetter )
{
   HANDLE hVolume;

   BOOL fRemoveSafely = FALSE;
   BOOL fAutoEject = FALSE;

   hVolume = OpenVolume(cDriveLetter);
   if( hVolume == INVALID_HANDLE_VALUE )
		return FALSE;

   if( LockVolume(hVolume) && DismountVolume(hVolume) )
   {
     fRemoveSafely = TRUE;

     if( PreventRemovalOfVolume(hVolume, FALSE) && AutoEjectVolume(hVolume) )
         fAutoEject = TRUE;
   }

   if( ! CloseVolume(hVolume) )
     return FALSE;

   return ( fRemoveSafely && fAutoEject );
}

#include "hbapi.h"
HB_FUNC( EJECTREMOVABLE )
{
   char * szDrive = (char *) hb_parc( 1 );
	BOOL retval = EjectVolume( *szDrive );
	if( retval )
		SHChangeNotify( SHCNE_DRIVEREMOVED, SHCNF_PATH , szDrive, NULL );
	
   hb_retl( retval );
}

#pragma ENDDUMP

@Nikos

>It is also possible to enable later the same drive (or a drive)
if I understood correctly, you mean the same drive-letter. my answer is: I dont know if this is possible, but i think that Windows "remember" the previous used drive-letter for a removable drive and try to give the same letter unless it is already occupied.

>How to become disconnect a map network drive
hmm, I guess that if the disk is mapped to a letter, the function should be able to eject it. otherwise maybe the UNC name of the drive must be used. you have to test it!

> How to become enable it
if you mean how to re-enable it without take it out and re-insert, this need further investigation. I will try to find a way, if time permits.. (or maybe some other guy here could help it.)

regards,
Pete

Posted: **Wed Nov 04, 2015 11:29 am**

I am sorry for the delayed post, i am home with a bad cold.

@Pete
Thanks a lot Pete! It also works flawlessly at windows 10. It doesn't work on Windows Server 2012, but maybe it is something permission-related.
I will test it some more and then i will post back.

@Grigory
Thanks a lot Grigory!

Everyone's help is much appreciated once more.Thanks a lot to all of you.

Posted: **Thu Nov 05, 2015 12:09 am**

Gracias Grigory ...

Posted: **Thu Nov 05, 2015 12:25 am**

PeteWG wrote:Hi,

(thanks for any "thanks" <g>)

@grigory
Well, the code i posted was of a "quick and dirty" kind.

I think, I had spotted the warnings but I (lazy!) cared not to pacify them;
it's nice that you took the time to do it.

Furthermore, the 1st version of the function was not only "warning-fraught", but also incomplete. (however, it did the job..)
Below is the 2nd version, enriched with one more operation: to notify Explorer that the disk has been removed, to stop displaying it (in case of USB), in the pane.

Code: Select all

// test program
request hb_gt_win_default
PROC MAIN( cDriveLetter )

	hb_Default( @cDriveLetter, "G:" )

	IF EjectRemovable( cDriveLetter )
		? "The drive " + cDriveLetter + " can be safely removed."
	ELSE
		? "Failed to safely remove/eject drive " + cDriveLetter
	ENDIF
	WAIT
	RETURN
// end test program

#pragma BEGINDUMP

#include <windows.h>
#include <winioctl.h>
#include <tchar.h>
#include <stdio.h>
#include <Shlobj.h>

// Prototypes
BOOL EjectVolume(TCHAR cDriveLetter);
HANDLE OpenVolume(TCHAR cDriveLetter);
BOOL LockVolume(HANDLE hVolume);
BOOL DismountVolume(HANDLE hVolume);
BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPrevent);
BOOL AutoEjectVolume(HANDLE hVolume);
BOOL CloseVolume(HANDLE hVolume);

LPTSTR szVolumeFormat = TEXT("\\\\.\\%c:");
LPTSTR szRootFormat = TEXT("%c:\\");

HANDLE OpenVolume(TCHAR cDriveLetter)
{
   HANDLE hVolume;
   UINT uDriveType;
   TCHAR szVolumeName[8];
   TCHAR szRootName[5];
   DWORD dwAccessFlags;

   wsprintf(szRootName, szRootFormat, cDriveLetter);
   uDriveType = GetDriveType(szRootName);

   switch(uDriveType)
   {
   case DRIVE_REMOVABLE:
     dwAccessFlags = GENERIC_READ | GENERIC_WRITE;
     break;
   case DRIVE_CDROM:
     dwAccessFlags = GENERIC_READ;
     break;
   default:
     return INVALID_HANDLE_VALUE;
   }

   wsprintf(szVolumeName, szVolumeFormat, cDriveLetter);

   hVolume = CreateFile(   szVolumeName,
                         dwAccessFlags,
                         FILE_SHARE_READ | FILE_SHARE_WRITE,
                         NULL,
                         OPEN_EXISTING,
                         0,
                         NULL );
   return hVolume;
}

BOOL CloseVolume(HANDLE hVolume)
{
   return CloseHandle(hVolume);
}

#define LOCK_TIMEOUT        10000       // 10 Seconds
#define LOCK_RETRIES        20

BOOL LockVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   DWORD dwSleepAmount;
   int nTryCount;

   dwSleepAmount = LOCK_TIMEOUT / LOCK_RETRIES;

   for( nTryCount = 0; nTryCount < LOCK_RETRIES; nTryCount++ )
   {
     if( DeviceIoControl( hVolume, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0,
                          &dwBytesReturned, NULL ) )
         return TRUE;

     Sleep( dwSleepAmount );
   }

   return FALSE;
}

BOOL DismountVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
   return DeviceIoControl( hVolume, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL, 0,
                           &dwBytesReturned, NULL );
}

BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPreventRemoval)
{
   DWORD dwBytesReturned;
   PREVENT_MEDIA_REMOVAL PMRBuffer;
   PMRBuffer.PreventMediaRemoval = fPreventRemoval;
	
   return DeviceIoControl( hVolume, IOCTL_STORAGE_MEDIA_REMOVAL,
                           &PMRBuffer, sizeof(PREVENT_MEDIA_REMOVAL),
                           NULL, 0, &dwBytesReturned, NULL );
}

BOOL AutoEjectVolume( HANDLE hVolume )
{
   DWORD dwBytesReturned;
	
   return DeviceIoControl( hVolume, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0,
                           &dwBytesReturned, NULL );
}

BOOL EjectVolume( TCHAR cDriveLetter )
{
   HANDLE hVolume;

   BOOL fRemoveSafely = FALSE;
   BOOL fAutoEject = FALSE;

   hVolume = OpenVolume(cDriveLetter);
   if( hVolume == INVALID_HANDLE_VALUE )
		return FALSE;

   if( LockVolume(hVolume) && DismountVolume(hVolume) )
   {
     fRemoveSafely = TRUE;

     if( PreventRemovalOfVolume(hVolume, FALSE) && AutoEjectVolume(hVolume) )
         fAutoEject = TRUE;
   }

   if( ! CloseVolume(hVolume) )
     return FALSE;

   return ( fRemoveSafely && fAutoEject );
}

#include "hbapi.h"
HB_FUNC( EJECTREMOVABLE )
{
   char * szDrive = (char *) hb_parc( 1 );
	BOOL retval = EjectVolume( *szDrive );
	if( retval )
		SHChangeNotify( SHCNE_DRIVEREMOVED, SHCNF_PATH , szDrive, NULL );
	
   hb_retl( retval );
}

#pragma ENDDUMP

@Nikos

>It is also possible to enable later the same drive (or a drive)
if I understood correctly, you mean the same drive-letter. my answer is: I dont know if this is possible, but i think that Windows "remember" the previous used drive-letter for a removable drive and try to give the same letter unless it is already occupied.

>How to become disconnect a map network drive
hmm, I guess that if the disk is mapped to a letter, the function should be able to eject it. otherwise maybe the UNC name of the drive must be used. you have to test it!

> How to become enable it
if you mean how to re-enable it without take it out and re-insert, this need further investigation. I will try to find a way, if time permits.. (or maybe some other guy here could help it.)

regards,
Pete

Very good!

Posted: **Thu Nov 05, 2015 2:09 pm**

Hi Pete thank you,
As the Vagelis already has written, It doesn't work on Windows Server 2012 at any hard drive (usb or sata).
The only thing it does, if you select a DVD drive letter the program ejects the drive without disabling it.

do you think there is any solution, any ideas?

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