Why is my print processor not showing up on my printer?

Question

I placed my print processor DLL in C:\Windows\System32\spool\prtprocs\x64, then I added it to the registry

under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows x64\Print Processors

the same way as the "winprint" key is added (with Driver=winprint.dll).

My DLL is written with the functions listed here: https://learn.microsoft.com/en-us/windows-hardware/drivers/print/functions-defined-by-print-processors

To test I made a copy of winprint.dll and added that to the registry under the name "tc_winprint" - that print processor shows up in the list:

What am I missing here? Does the DLL need to be registered somehow/somewhere?

Answer 1

Hello,

Try using this command in this document:

regsvr32 [/u] [/s] [/n] [/i[:cmdline]] <dllname>

For more information, see the official Microsoft documentation: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/regsvr32

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