How to create a new port and assign it to a printer

Question

We have a virtual printer (provided by a 3rd party) that is getting assigned to an invalid local printer port. The printer is always local (we aren\'t dealing with a remote

Answer 1

I guess your code merely worked by chance. According to https://docs.microsoft.com/en-us/windows-hardware/drivers/print/tcpmon-xcv-commands (and to my own experience) the real solution is:

PORT_DATA_1 pdPortData;  
wcscpy_s(pdPortData.sztPortName, MAX_PORTNAME_LEN, lpPortName);  
[...]
if (!XcvData(hXcv, L"AddPort", (BYTE*) &pdPortData, sizeof(PORT_DATA_1), NULL, 0, &dwNeeded, &dwStatus))
[...]

By chance sztPortName is the first element in PORT_DATA_1 structure. Maybe that's why your code did not fail, although it is wrong.