C# Signature:

[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool EnumPrinters(PrinterEnumFlags Flags, string Name, uint Level, IntPtr pPrinterEnum, uint cbBuf, ref uint pcbNeeded, ref uint pcReturned);

User-Defined Types:

PRINTER_INFO_2

PrinterEnumFlags

Notes:

You will need to import System.Runtime.InteropServices

Tips & Tricks:

Please add some!

Sample Code:

private const int ERROR_INSUFFICIENT_BUFFER = 122;

public static PRINTER_INFO_2[] enumPrinters(PrinterEnumFlags Flags)
{
    uint cbNeeded = 0;
    uint cReturned = 0;
    if (EnumPrinters(Flags, null, 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned))
    {
    return null;
    }
    int lastWin32Error = Marshal.GetLastWin32Error();
    if (lastWin32Error == ERROR_INSUFFICIENT_BUFFER)
    {
    IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
    if (EnumPrinters(Flags, null, 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned))
    {
        PRINTER_INFO_2[] printerInfo2 = new PRINTER_INFO_2[cReturned];
        int offset = pAddr.ToInt32();
        Type type = typeof(PRINTER_INFO_2);
        int increment = Marshal.SizeOf(type);
        for (int i = 0; i < cReturned; i++)
        {
        printerInfo2[i] = (PRINTER_INFO_2)Marshal.PtrToStructure(new IntPtr(offset), type);
        offset += increment;
        }
        Marshal.FreeHGlobal(pAddr);
        return printerInfo2;
    }
    lastWin32Error = Marshal.GetLastWin32Error();
    }
    throw new Win32Exception(lastWin32Error);
}

Alternative Managed API:

PrinterSettings.InstalledPrinters, but this only gives the name of the printers.