safely shutdown usb hard drive

[dedndave]

when things settle down around here, i might take another look at this
it seems interesting and may be a good way to learn more about windows
i would think there is a way to do it without the DDK - perhaps by using some undocumented calls

[UtillMasm]

 :U
oh my fo!
you must be my master!

[dedndave]

nahhhhhhhhh - just super-dave, is all

[PBrennick]

If possible, it would be nice if you shared the sources onless this is a job. It is very useful stuff to know. What I am trying to do is to create a software light switch for the USB light I use to see the keyboard. I would not have to keep pulling it out every morning.

Dave, Using a dial-up can be a pain if it times out. What I used to do is compose long replies whilst offline (in a text editor). Then I would sign in and paste it.

Paul

[dedndave]

yah - i dunno what happened there - i thought i was logged in "forever" - lol - oh well
but, i need to start posting in a text file like you said so that i can insure it is correct
this is especially true for posts that have code - wouldn't want someone trying out crummy code

i think what azdps wound up doing was to translate the code at this link from C into ASM....
http://www.codeproject.com/KB/system/RemoveDriveByLetter.aspx

[azdps]

here is the code. it will shutdown all usb drive (thumb drive, flash drive, usb hard drive) devices connected to your system.

Code Select Expand

.386
.model flat, stdcall
option casemap: none

   include         /masm32/include/windows.inc
   include         /masm32/include/kernel32.inc
   include         /masm32/include/user32.inc
   include         /masm32/include/comctl32.inc
   include         /masm32/include/masm32.inc
   include         /masm32/include/debug.inc
   include         /masm32/include/Setupapi.inc
   
   includelib      /masm32/lib/kernel32.lib
   includelib      /masm32/lib/user32.lib
   includelib      /masm32/lib/comctl32.lib
   includelib      /masm32/lib/masm32.lib
   includelib      /masm32/lib/debug.lib
   includelib      /masm32/lib/Setupapi.lib

SP_DEVINFO_DATA STRUCT
     cbSize              dd ?
     ClassGuid           GUID <>
     DevInst             dd ?
     Reserved            dd ?
SP_DEVINFO_DATA ENDS

.const
     DIGCF_PRESENT           equ 02h
     DIGCF_DEVICEINTERFACE   equ 10h
     SPDRP_FRIENDLYNAME      equ 0000000Ch
     SPDRP_REMOVAL_POLICY    equ 0000001Fh
     GUID_DEVINTERFACE_DISK TEXTEQU <{053f56307h,0b6bfh,011d0h,{094h,0f2h,000h,0a0h,0c9h,01eh,0fbh,08bh}}>
     xGUID_DEVINTERFACE_DISK GUID GUID_DEVINTERFACE_DISK

.data
  txtShutdown         db "Shutting down",0
 
.data?
  hDrive              HANDLE ?
  hDeviceInfoSet      HANDLE ?
  cbReturned          dd ?
  hDeviceInstance     dd ?
  szVetoName          dd ?
  szRemovable         db 256 dup (?)
  szBuff1             db 128 dup (?)
  devinfo             SP_DEVINFO_DATA  <?>


.code
start:

    invoke SetupDiGetClassDevs,addr xGUID_DEVINTERFACE_DISK,0,0,DIGCF_PRESENT + DIGCF_DEVICEINTERFACE
    mov hDeviceInfoSet,eax
     
    xor ecx,ecx
    mov devinfo.cbSize,sizeof SP_DEVINFO_DATA
@@:
    push ecx
    invoke SetupDiEnumDeviceInfo,hDeviceInfoSet,ecx,addr devinfo
        .if eax == TRUE
            invoke SetupDiGetDeviceRegistryProperty,hDeviceInfoSet,addr devinfo,SPDRP_REMOVAL_POLICY,NULL,addr szRemovable,4,0
                .if szRemovable == 3
                    invoke SetupDiGetDeviceRegistryProperty,hDeviceInfoSet,addr devinfo,SPDRP_FRIENDLYNAME,NULL,addr szRemovable,256,0
                    invoke CM_Get_Parent,addr hDeviceInstance,devinfo.DevInst,0
                    invoke CM_Request_Device_Eject,hDeviceInstance,0,addr szVetoName,MAX_PATH,0                 
                    invoke MessageBox,0,addr szRemovable,addr txtShutdown,0
                    invoke RtlZeroMemory,addr szRemovable,sizeof szRemovable
                    pop ecx
                    inc ecx
                    jmp @B
                .else ; its not removable
                    pop ecx
                    inc ecx
                    jmp @B
                .endif
         .endif

invoke SetupDiDestroyDeviceInfoList,hDeviceInfoSet
invoke CloseHandle,hDrive


; #################################################################################################

end start
[attachment deleted by admin]

[azdps]

now i'm working on handling the notifications of when a usb disk device is connected and disconnected. i've run into a problem though. when a device is connected im able to obtain the drive letter of the new device after receiving a WM_DEVICECHANGE message. i need to find out how to obtain the "friendly name" of a device using the drive letter.

Edit:
i think i will try a different approach. this doesnt seem to be working.

[dedndave]

i saw a script
it was in VB - lol
only us good guys write in asm   :dance: