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ERROR_PRINT_PROCESSOR_ALREADY_INSTALLED
A print processor is a named spooler component that reads spooled data, converts or interprets the data stream, and writes the resulting stream back to the spooler for delivery through the print monitor. It is separate from the printer driver and from the queue itself.
AddPrintProcessor installs a processor on the specified server and adds its name to that server's supported processor list. An installer that always calls the add function without first reconciling existing state can therefore encounter this code on an otherwise valid server.
Compare registration state
- Use EnumPrintProcessors on the target server and environment and compare the exact processor name.
- Record the processor DLL or deployment artifact expected by the installer; a matching name does not prove that the intended build is present.
- Use GetPrintProcessorDirectory or documented deployment mechanisms rather than copying a replacement into an arbitrary spooler path.
- Treat upgrades as versioned deployment work; do not delete a processor merely to make an unconditional AddPrintProcessor call succeed.
AddPrintProcessor · Introduction to Print Processors · EnumPrintProcessors
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