UnicodeString or Registry prob ?

Ronan_Launay · October 14, 2004, 6:41am

when i do this :
//Opening COM Port .
RtlInitAnsiString(&ntString,\DosDevices\COM3);
RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
&pdx->fileObject,&pdx->SerialDeviceObject);
if(!NT_SUCCESS(status)){
KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
%X\n",status));
return status;
}

it works just fine but if i do this i got IoGetDeviceObjectPointer fails ,
with a C000003B status code :
(i got a good value in Registry , Port (REG_SZ) :COM3 )
i’m geting others values from registry w/o any problem .
so i guess the concatenation is wrong but can’t figure why :((

RtlInitUnicodeString(&uName, L"Port");
status = ZwQueryValueKey(hFolder,&uName,
KeyValuePartialInformation,pValue,structLength,&ResultLength);
if(!NT_SUCCESS(status))return status;
RtlInitUnicodeString(&uResult,(PWCHAR)pValue->Data);

// Opening COM Port .
RtlInitAnsiString(&ntString,“\DosDevices\”);
RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
RtlAppendUnicodeStringToString(&uString,&uResult);
status = IoGetDeviceObjectPointer(&uResult,FILE_ALL_ACCESS,
&pdx->fileObject,&pdx->SerialDeviceObject);
if(!NT_SUCCESS(status)){
KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
%X\n",status));
return status;
}

Ronan_Launay · October 14, 2004, 6:43am

should read :
status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
&pdx->fileObject,&pdx->SerialDeviceObject);

in the second code sample .

“Launay Ronan” a écrit dans le message de
news:xxxxx@ntdev…
> when i do this :
> //Opening COM Port .
> RtlInitAnsiString(&ntString,\DosDevices\COM3);
> RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> &pdx->fileObject,&pdx->SerialDeviceObject);
> if(!NT_SUCCESS(status)){
> KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> %X\n",status));
> return status;
> }
>
> it works just fine but if i do this i got IoGetDeviceObjectPointer fails
,
> with a C000003B status code :
> (i got a good value in Registry , Port (REG_SZ) :COM3 )
> i’m geting others values from registry w/o any problem .
> so i guess the concatenation is wrong but can’t figure why :((
>
> RtlInitUnicodeString(&uName, L"Port");
> status = ZwQueryValueKey(hFolder,&uName,
> KeyValuePartialInformation,pValue,structLength,&ResultLength);
> if(!NT_SUCCESS(status))return status;
> RtlInitUnicodeString(&uResult,(PWCHAR)pValue->Data);
>
> // Opening COM Port .
> RtlInitAnsiString(&ntString,“\DosDevices\”);
> RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> RtlAppendUnicodeStringToString(&uString,&uResult);
> status = IoGetDeviceObjectPointer(&uResult,FILE_ALL_ACCESS,
> &pdx->fileObject,&pdx->SerialDeviceObject);
> if(!NT_SUCCESS(status)){
> KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> %X\n",status));
> return status;
> }
>
>
>

OSR_Community_User · October 14, 2004, 6:50am

Why not just dump the string components at each step using WinDBG?

It would make it fairly obvious what’s wrong, I suspect…

–
Mats

xxxxx@lists.osr.com wrote on 10/14/2004 11:42:21 AM:

should read :
status =3D IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
&pdx->fileObject,&pdx->SerialDeviceObject);

in the second code sample .

“Launay Ronan” a =E9crit dans le message de
> news:xxxxx@ntdev…
> > when i do this :
> > //Opening COM Port .
> > RtlInitAnsiString(&ntString,\DosDevices\COM3);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > status =3D IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> > it works just fine but if i do this i got IoGetDeviceObjectPointer=

fails
> ,
> > with a C000003B status code :
> > (i got a good value in Registry , Port (REG_SZ) :COM3 )
> > i’m geting others values from registry w/o any problem .
> > so i guess the concatenation is wrong but can’t figure why :((
> >
> > RtlInitUnicodeString(&uName, L"Port");
> > status =3D ZwQueryValueKey(hFolder,&uName,
> > KeyValuePartialInformation,pValue,structLength,&ResultLength);
> > if(!NT_SUCCESS(status))return status;
> > RtlInitUnicodeString(&uResult,(PWCHAR)pValue->Data);
> >
> > // Opening COM Port .
> > RtlInitAnsiString(&ntString,“\DosDevices\”);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > RtlAppendUnicodeStringToString(&uString,&uResult);
> > status =3D IoGetDeviceObjectPointer(&uResult,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> >
> >
>
>
>
> —
> Questions? First check the Kernel Driver FAQ at http://www.
> osronline.com/article.cfm?id=3D256
>
> You are currently subscribed to ntdev as: xxxxx@3dlabs.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com=

> ForwardSourceID:NT00005582=

Ronan_Launay · October 14, 2004, 8:43am

i found my mistake .
buffer of first unicode string was too small .
actually RtlAppendUnicodeStringToString failed .
sorry for bothering …

“Launay Ronan” a écrit dans le message de
news:xxxxx@ntdev…
> should read :
> status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> &pdx->fileObject,&pdx->SerialDeviceObject);
>
> in the second code sample .
>
>
> “Launay Ronan” a écrit dans le message de
> news:xxxxx@ntdev…
> > when i do this :
> > //Opening COM Port .
> > RtlInitAnsiString(&ntString,\DosDevices\COM3);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> > it works just fine but if i do this i got IoGetDeviceObjectPointer
fails
> ,
> > with a C000003B status code :
> > (i got a good value in Registry , Port (REG_SZ) :COM3 )
> > i’m geting others values from registry w/o any problem .
> > so i guess the concatenation is wrong but can’t figure why :((
> >
> > RtlInitUnicodeString(&uName, L"Port");
> > status = ZwQueryValueKey(hFolder,&uName,
> > KeyValuePartialInformation,pValue,structLength,&ResultLength);
> > if(!NT_SUCCESS(status))return status;
> > RtlInitUnicodeString(&uResult,(PWCHAR)pValue->Data);
> >
> > // Opening COM Port .
> > RtlInitAnsiString(&ntString,“\DosDevices\”);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > RtlAppendUnicodeStringToString(&uString,&uResult);
> > status = IoGetDeviceObjectPointer(&uResult,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> >
> >
>
>
>

OSR_Community_User · October 14, 2004, 12:12pm

You are dealing with string constants, there is no need to go from ANSI to Unicode. What was this

RtlInitAnsiString(&ntString,\DosDevices\COM3);
RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);

Can be this

RtlInitUnicodeString(&uString, L"\DosDevices\COM3");

Same for the 2nd method, this

RtlInitAnsiString(&ntString,“\DosDevices\”);
RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);

Becomes

RtlInitUnicodeString(&uString, L"\DosDevices\");

D

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of Launay Ronan
Sent: Thursday, October 14, 2004 5:43 AM
To: Windows System Software Devs Interest List
Subject: Re:[ntdev] UnicodeString or Registry prob ?

i found my mistake .
buffer of first unicode string was too small .
actually RtlAppendUnicodeStringToString failed .
sorry for bothering …

“Launay Ronan” a ?crit dans le message de
news:xxxxx@ntdev…
> should read :
> status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> &pdx->fileObject,&pdx->SerialDeviceObject);
>
> in the second code sample .
>
>
> “Launay Ronan” a ?crit dans le message de
> news:xxxxx@ntdev…
> > when i do this :
> > //Opening COM Port .
> > RtlInitAnsiString(&ntString,\DosDevices\COM3);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > status = IoGetDeviceObjectPointer(&uString,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> > it works just fine but if i do this i got IoGetDeviceObjectPointer
fails
> ,
> > with a C000003B status code :
> > (i got a good value in Registry , Port (REG_SZ) :COM3 )
> > i’m geting others values from registry w/o any problem .
> > so i guess the concatenation is wrong but can’t figure why :((
> >
> > RtlInitUnicodeString(&uName, L"Port");
> > status = ZwQueryValueKey(hFolder,&uName,
> > KeyValuePartialInformation,pValue,structLength,&ResultLength);
> > if(!NT_SUCCESS(status))return status;
> > RtlInitUnicodeString(&uResult,(PWCHAR)pValue->Data);
> >
> > // Opening COM Port .
> > RtlInitAnsiString(&ntString,“\DosDevices\”);
> > RtlAnsiStringToUnicodeString(&uString,&ntString,TRUE);
> > RtlAppendUnicodeStringToString(&uString,&uResult);
> > status = IoGetDeviceObjectPointer(&uResult,FILE_ALL_ACCESS,
> > &pdx->fileObject,&pdx->SerialDeviceObject);
> > if(!NT_SUCCESS(status)){
> > KdPrint((DRIVERNAME" - IoGetDeviceObjectPointer Fails ,status :
> > %X\n",status));
> > return status;
> > }
> >
> >
> >
>
>
>

—
Questions? First check the Kernel Driver FAQ at http://www.osronline.com/article.cfm?id=256

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