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WritePrinter (winspool)
 
.
Summary
The WritePrinter function notifies the print spooler that data should be written to the specified printer.

C# Signature:

[DllImport("winspool.drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
private static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, UInt32 dwCount, out UInt32 dwWritten);
private static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

VB Signature:

    <DllImport("winspool.Drv", EntryPoint:="WritePrinter", SetLastError:=True, CharSet:=CharSet.Unicode, ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function WritePrinter(ByVal hPrinter As IntPtr, ByVal pBytes As IntPtr, ByVal dwCount As Int32, ByRef dwWritten As Int32) As Boolean
    End Function
Declare Function WritePrinter Lib "winspool.dll" (TODO) As TODO

VB 2008 Signature:

<DllImport("winspool.drv")> Private Function WritePrinter(ByVal hPrinter As IntPtr, ByVal pBytes As IntPtr, ByVal dwCount As UInt32, ByVal dwWritten As UInt32) As Boolean

<DllImport("winspool.drv")> Private Function WritePrinter(ByVal hPrinter As IntPtr, ByVal pBytes As IntPtr, ByVal dwCount As Int32, ByVal dwWritten As Int32) As Boolean

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

    // From: http://support.microsoft.com/kb/322091
    // SendBytesToPrinter()
    // When the function is given a printer name and an unmanaged array
    // of bytes, the function sends those bytes to the print queue.
    // Returns true on success, false on failure.
    public static bool SendBytesToPrinter( string szPrinterName, IntPtr pBytes, Int32 dwCount)
    {
    Int32    dwError = 0, dwWritten = 0;
    IntPtr    hPrinter = new IntPtr(0);
    DOCINFOA    di = new DOCINFOA();
    bool    bSuccess = false; // Assume failure unless you specifically succeed.

    di.pDocName = "My C#.NET RAW Document";
    di.pDataType = "RAW";

    // Open the printer.
    if( OpenPrinter( szPrinterName.Normalize(), out hPrinter, IntPtr.Zero ) )
    {
        // Start a document.
        if( StartDocPrinter(hPrinter, 1, di) )
        {
        // Start a page.
        if( StartPagePrinter(hPrinter) )
        {
            // Write your bytes.
            bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
            EndPagePrinter(hPrinter);
        }
        EndDocPrinter(hPrinter);
        }
        ClosePrinter(hPrinter);
    }
    // If you did not succeed, GetLastError may give more information
    // about why not.
    if( bSuccess == false )
    {
        dwError = Marshal.GetLastWin32Error();
    }
    return bSuccess;
    }

Documentation

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