HELP NEEDED: Mirror Display driver problem...

[Nadav]

Hi,

I am trying to access the miniport driver from user mode, when trying to
access the display driver all works fine, BUT when trying to get the
miniport handle ( at user mode ) I keep getting an invalid handle with a
file not found last error code... Why can this happen? The driver name I am
using is found under
'HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\%DriverName%' and the same
name found in the .inf file used to install the driver... What am I doing
wrong here? following is a snap-shot of the code used to create the driver
and the .inf file used to install the driver...


THE CODE USED TO GET THE DRIVERS HANDLE
=======================================
// Returns an invalid handle, GetLastError returns file not found...
HANDLE hDevice = CreateFile("\\\\.\\MirrorTest", GENERIC_READ |
GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
....
....


THE ".INF" FILE
============
; MirrorTest.inf
;
; Installation inf for the Mirror graphics adapter.
;
; Copyright (x) 1995-1999 Microsoft Corporation. All rights reserved
;

[Version]
Signature="$CHICAGO$"
Provider=%Microsoft%
ClassGUID={4D36E968-E325-11CE-BFC1-08002BE10318}
Class=Display
DriverVer=06/01/1999,1.0

[DestinationDirs]
DefaultDestDir = 11
MirrorTest.Miniport = 12 ; drivers
MirrorTest.Display = 11 ; system32

;
; Driver information
;
[Manufacturer]
%Microsoft% = MirrorTest.Mfg

[MirrorTest.Mfg]
%Mirror% = MirrorTest, Microsoft_Mirror_Sample1

;
; General installation section
;
[MirrorTest]
CopyFiles=MirrorTest.Miniport, MirrorTest.Display

;
; File sections
;
[MirrorTest.Miniport]
MirrorTest.sys

[MirrorTest.Display]
MirrorTest.dll


;
; Service Installation
;
[MirrorTest.Services]
AddService = MirrorTest, 0x00000002, mirror_Service_Inst,
mirror_EventLog_Inst

[mirror_Service_Inst]
ServiceType = 1 ; SERVICE_KERNEL_DRIVER
StartType = 1 ; SERVICE_SYSTEM_START
ErrorControl = 0 ; SERVICE_ERROR_IGNORE
LoadOrderGroup = Video
ServiceBinary = %12%\MirrorTest.sys

[mirror_EventLog_Inst]
AddReg = mirror_EventLog_AddReg

[mirror_EventLog_AddReg]
HKR,,EventMessageFile,0x00020000,"%SystemRoot%\System32\IoLogMsg.dll;%System
Root%\System32\drivers\MirrorTest.sys"
HKR,,TypesSupported,0x00010001,7

;
; Software Installation
;
[MirrorTest.SoftwareSettings]
AddReg = mirror_SoftwareDeviceSettings

[mirror_SoftwareDeviceSettings]
HKR,, MirrorDriver, %REG_DWORD%, 1
HKR,, InstalledDisplayDrivers, %REG_MULTI_SZ%, MirrorTest
HKR,, VgaCompatible, %REG_DWORD%, 0
HKR,, Attach.ToDesktop, %REG_DWORD%, 1

[MirrorTest.OpenGLSoftwareSettings]
AddReg = mirror_OpenGLSoftwareSettings

[mirror_OpenGLSoftwareSettings]
;
; Not currently used:
;
[MirrorTest.GeneralConfigData]
MaximumNumberOfDevices = 1
KeepExistingDriverEnabled = 1

;
; Source file information
;
[SourceDisksNames.x86]
1 = %DiskId%,,,""

[SourceDisksFiles]
MirrorTest.sys = 1
MirrorTest.dll = 1

[Strings]
;
; Non-Localizable Strings
;
REG_SZ = 0x00000000
REG_MULTI_SZ = 0x00010000
REG_EXPAND_SZ = 0x00020000
REG_BINARY = 0x00000001
REG_DWORD = 0x00010001
SERVICEROOT = "System\CurrentControlSet\Services"

;
; Localizable Strings
;
DiskId = "Mirror Installation DISK (VIDEO)"
GraphAdap = "Graphics Adapter"
Microsoft = "Microsoft"
Mirror = "Microsoft Mirror Driver"

Thanks,
Nadav.

 

[Tim Roberts]

I am trying to access the miniport driver from user mode, when trying to
access the display driver all works fine, BUT when trying to get the
miniport handle ( at user mode ) I keep getting an invalid handle with a
file not found last error code... Why can this happen?

Because display miniports cannot be opened from user mode. The device open
code is contained in the port driver, and it defines itself as "exclusive".
The display driver gets to open it, but no one else.