Port monitor DLL not loaded in Vista / Windows 7

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Vista

C++

C

Windows

Win7

printing

, +

I have written a port monitor based on the "Virtual Image Printer" open-source project. It works fine on XP but fails to load the port monitor DLL on Win7, even though the NSIS-based install process has worked and the printer is installed.

I suspect the problem is either (a) in the INF or the registry and that somehow the printer, port and DLL are not connected together, or (b) something stops the DLL loading, but I don't know what.

Any help would be very much appreciated, this is driving me nuts!

Rik.
rikpage123@gmail.com


Registry entries after install

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print ->
 \Environments\Windows NT x86\Drivers\Version-3\MyPrinter
 \Monitors\MyPrinter_Port
 \Printers\MyPrinter

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion ->
 \Print\Printers\MyPrinter\DsDriver,DsSpooler,PnPData,PrinterDriverData
 \Ports - has value "MyPrinter_Port"

INF file:

[Version]
Signature="$Windows NT$"
ClassGUID={4D36E979-E325-11CE-BFC1-08002BE10318}
Class=Printer
Provider="Ruk"
DriverVer=08/03/2010, 1.1.1.1

[Manufacturer]
"%Ruk%"=Ruk, NTx86, NTx86.6.0

[Ruk]
"MyPrinter" = DriverInstall
[Ruk.NTx86]
"MyPrinter" = DriverInstall
[Ruk.NTx86.6.0]
"MyPrinter" = DriverInstall

; Pre-vista & post-Vista currently the same as packages not implemented...
[DriverInstall]
CopyFiles=@MyPrinter.dll,@MyPrinter.gpd,@RukUSB.dll
DataFile=MyPrinter.gpd
Include=NTPRINT.INF
DataSection=UNIDRV_DATA
Needs=UNIDRV.OEM,UNIDRV_DATA,TTFSUB.OEM

; Install port monitor
; (Didn't make any difference)
;[PortMonitors]
;"MyPrinter_Port" = MyPrinter_Port
;
;[MyPrinter_Port]
;CopyFiles=@MyPrinter.dll,@MyPrinter.gpd,@RukUSB.dll
;PortMonitorDll = MyPrinter.dll

[DestinationDirs]
DefaultDestDir=66000

[SourceDisksNames.x86]
1 = %MediaDescription%,,,"I386"

[SourceDisksFiles]
MyPrinter.gpd = 1
MyPrinter.dll = 1
RukUSB.dll = 1

[Strings]
MediaDescription = "Ruk Printer driver disk"
Ruk = "My Printers"