C# Signature:

[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool EnumPrinterDrivers(String pName, String pEnvironment, uint level, IntPtr pDriverInfo, uint cdBuf, ref uint pcbNeeded, ref uint pcRetruned);

VB Signature:

Declare Function EnumPrinterDrivers Lib "winspool.dll" (TODO) As TODO

User-Defined Types:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

    public struct DRIVER_INFO_2
    {
        public uint cVersion;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pEnvironment;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pDriverPath;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pDataFile;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pConfigFile;
    }

DRIVER_INFO_2

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

pName is the machine name. If null, it will target the local computer. If a remote machine is specified, it must be preceded by @"\\".

Please add some!

Sample Code:

private DRIVER_INFO_2[] GetInstalledPrinterDrivers()

    {
        /*
        'To determine the required buffer size,
        'call EnumPrinterDrivers with cbBuffer set
        'to zero. The call will fails specifying
        'ERROR_INSUFFICIENT_BUFFER and filling in
        'cbRequired with the required size, in bytes,
        'of the buffer required to hold the array
        'of structures and data.
*/

        uint cbNeeded = 0;
        uint cReturned = 0;
        if (EnumPrinterDrivers(null, null, 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned))
        {
        //succeeds, but shouldn't, because buffer is zero (too small)!
        throw new Exception("EnumPrinters should fail!");
        }

        int lastWin32Error = Marshal.GetLastWin32Error();
        //ERROR_INSUFFICIENT_BUFFER = 122 expected, if not -> Exception
        if (lastWin32Error != 122)
        {
        throw new Win32Exception(lastWin32Error);
        }

        IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
        if (EnumPrinterDrivers(null, null, 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned))
        {
        DRIVER_INFO_2[] printerInfo2 = new DRIVER_INFO_2[cReturned];
        int offset = pAddr.ToInt32();
        Type type = typeof(DRIVER_INFO_2);
        int increment = Marshal.SizeOf(type);
        for (int i = 0; i < cReturned; i++)
        {
            printerInfo2[i] = (DRIVER_INFO_2)Marshal.PtrToStructure(new IntPtr(offset), type);
            offset += increment;
        }
        Marshal.FreeHGlobal(pAddr);

        return printerInfo2;
        }

        throw new Win32Exception(Marshal.GetLastWin32Error());
    }

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).