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getprinterdriver (winspool)
 
.
Summary
TODO - a short description

C# Signature:

[DllImport("winspool.drv", CharSet=CharSet.Auto, SetLastError=true)]
static extern int GetPrinterDriver(IntPtr hPrinter, string pEnvironment, uint Level, IntPtr pDriverInfo, uint cbBuf, out uint pcbNeeded);

VB Signature:

User-Defined Types:

DRIVER_INFO_1

DRIVER_INFO_2

DRIVER_INFO_3

DRIVER_INFO_4

DRIVER_INFO_5

DRIVER_INFO_6

DRIVER_INFO_8

Notes:

As always, only do SetLastError=true if you actually intend to call GetLastError.

Tips & Tricks:

Please add some!

Sample Code:

    [DllImport("winspool.drv", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern int GetPrinterDriver(IntPtr hPrinter, string pEnvironment, uint Level, IntPtr pDriverInfo,
    int cbBuf, out int pcbNeeded);

    /// <summary>
    /// The .NET definition of the win32 DRIVER_INFO_8 structure.
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    internal class DRIVER_INFO_8
    {
    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;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pHelpFile;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pDependentFiles;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pMonitorName;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pDefaultDataType;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszzPreviousNames;
    public ComTypes.FILETIME ftDriverDate;
    public UInt64 dwlDriverVersion;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszMfgName;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszOEMUrl;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszHardwareID;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszProvider;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszPrintProcessor;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszVendorSetup;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszzColorProfiles;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszInfPath;
    public uint dwPrinterDriverAttributes;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string pszzCoreDriverDependencies;
    public ComTypes.FILETIME ftMinInboxDriverVerDate;
    public UInt64 dwlMinInboxDriverVerVersion;
    }

    /// <summary>
    /// This returns the data type to use so that we can just throw bytes at the printer. Recent printer drivers use
    /// the XPS driver model and require the data type to be XPS_PASS. For older drivers the data type needs to be
    /// RAW.
    /// </summary>
    /// <param name="printerHandle">The handle to a printer, returned by OpenPrinter.</param>
    /// <param name="dataType">The returned data type, XPS_PASS or RAW.</param>
    /// <returns>true if successful, otherwise false.</returns>
    private static bool GetDataType(IntPtr printerHandle, out string dataType)
    {
        IntPtr driverInfo = new IntPtr(0);
        int needed;
        DRIVER_INFO_8 driverInfo8;

        dataType = null;
        // The first call to GetPrinterDriver is just to get the buffer length required
        if (NativeMethods.GetPrinterDriver(printerHandle, null, 8, driverInfo, 0, out needed) != 0)
        {
        // There's something wrong if the above call doesn't fail with a zero length buffer
        return false;
        }

        if (Marshal.GetLastWin32Error() != 122) // ERROR_INSUFFICIENT_BUFFER
        {
        return false;
        }

        try
        {
        driverInfo = Marshal.AllocHGlobal(needed);
        if (NativeMethods.GetPrinterDriver(printerHandle, null, 8, driverInfo, needed, out needed) == 0)
        {
            return false;
        }

        driverInfo8 = (DRIVER_INFO_8)Marshal.PtrToStructure(driverInfo, typeof(DRIVER_INFO_8));
        dataType = (driverInfo8.dwPrinterDriverAttributes & 2) == 2 ? "XPS_PASS" : "RAW"; // 2 = PRINTER_DRIVER_XPS
        return true;
        }
        finally
        {
        Marshal.FreeHGlobal(driverInfo);
        }
    }

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