Imports System.Diagnostics.Debug
Imports System.Drawing.Printing
Imports System.Runtime.InteropServices

Public Class Form3
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        'This call is required by the Windows Form Designer.
        InitializeComponent()
        'Add any initialization after the InitializeComponent() call
    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Command1 As System.Windows.Forms.Button
    Friend WithEvents Command2 As System.Windows.Forms.Button
    Friend WithEvents Command3 As System.Windows.Forms.Button
    Friend WithEvents Timer1 As System.Windows.Forms.Timer
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.Command1 = New System.Windows.Forms.Button
        Me.Command2 = New System.Windows.Forms.Button
        Me.Command3 = New System.Windows.Forms.Button
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.TextBox3 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        '
        'Command1
        '
        Me.Command1.Location = New System.Drawing.Point(352, 24)
        Me.Command1.Name = "Command1"
        Me.Command1.Size = New System.Drawing.Size(136, 23)
        Me.Command1.TabIndex = 0
        Me.Command1.Text = "Activar"
        '
        'Command2
        '
        Me.Command2.Location = New System.Drawing.Point(360, 112)
        Me.Command2.Name = "Command2"
        Me.Command2.Size = New System.Drawing.Size(128, 23)
        Me.Command2.TabIndex = 1
        Me.Command2.Text = "Parar"
        '
        'Command3
        '
        Me.Command3.Location = New System.Drawing.Point(360, 224)
        Me.Command3.Name = "Command3"
        Me.Command3.Size = New System.Drawing.Size(128, 23)
        Me.Command3.TabIndex = 2
        Me.Command3.Text = "actualizar"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(8, 24)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(320, 80)
        Me.TextBox1.TabIndex = 3
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(8, 120)
        Me.TextBox2.Multiline = True
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(320, 80)
        Me.TextBox2.TabIndex = 4
        '
        'Timer1
        '
        Me.Timer1.Enabled = True
        '
        'TextBox3
        '
        Me.TextBox3.Location = New System.Drawing.Point(8, 216)
        Me.TextBox3.Multiline = True
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.TextBox3.Size = New System.Drawing.Size(320, 80)
        Me.TextBox3.TabIndex = 5
        '
        'Form3
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(504, 317)
        Me.Controls.Add(Me.TextBox3)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Command3)
        Me.Controls.Add(Me.Command2)
        Me.Controls.Add(Me.Command1)
        Me.Name = "Form3"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
#End Region

    Public Shared Sub main()
        Dim PrntInfo As New Form1
        PrntInfo.ShowDialog()
    End Sub

    Private Sub Command1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Command1.Click
        'Enable the timer to start printer status checks.
        Timer1.Enabled = True
        Timer1.Start()

        'Enable and disable the start and stop buttons.
        Command1.Enabled = False
        Command2.Enabled = True
        Command3.Enabled = True
    End Sub

    Private Sub Command2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Command2.Click
        'Disable the timer to stop additional printer checks.
        Timer1.Enabled = False

        'Enable and disable the start and stop buttons.
        Command1.Enabled = True
        Command2.Enabled = False
        Command3.Enabled = True
        API = Nothing
    End Sub

    Private Sub Command3_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Command3.Click
        'Clear the text boxes to display the printer status.
        TextBox1.Text = ""
        TextBox2.Text = ""
        TextBox3.Text = ""
    End Sub

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
        Handles MyBase.Load
        'Initialize captions for the buttons.
        Command1.Text = "Empezar"
        Command2.Text = "Para"
        Command3.Text = "Actualizar"

        'Clear the text boxes to display the printer status.
        TextBox1.Text = ""
        TextBox2.Text = ""
        TextBox3.Text = ""

        Command1.Enabled = True
        'Disable the stop and clear buttons.
        Command2.Enabled = False
        Command3.Enabled = False

        'Set the timer interval to 500 milliseconds to examine the printer status.
        Timer1.Enabled = False
        Timer1.Interval = 500
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Timer1.Tick
        Dim PrinterStatus As String
        Dim JobStatus As String
        Dim ErrorInfo As String

        'Clear the text boxes to display the status.
        TextBox1.Text = ""
        TextBox2.Text = ""
        TextBox3.Text = ""

        'Call the CheckPrinter function.
        TextBox1.Text = CheckPrinter(PrinterStatus, JobStatus)
        TextBox2.Text = PrinterStatus
        TextBox3.Text = JobStatus
    End Sub

    Public Function CheckPrinter(ByRef PrinterStr As String, _
        ByRef JobStr As String) As String
        Dim hPrinter As IntPtr
        Dim ByteBuf As Long
        Dim BytesNeeded As Int32
        Dim PI2 As New PRINTER_INFO_2
        Dim intCount As Long
        Dim JI2(intCount) As JOB_INFO_2
        Dim PrinterInfo() As Byte
        Dim JobInfo() As Byte
        Dim result As Long
        Dim LastError As Long
        Dim PrinterName As String
        Dim tempStr As String
        Dim NumJI2 As Int32
        Dim pDefaults As PRINTER_DEFAULTS

        'Set a default return value if no errors occur.
        CheckPrinter = "Printer info retrieved!"

        Dim PD As New PrintDocument
        PrinterName = PD.PrinterSettings.PrinterName

        'Set the access security setting that you want.
        pDefaults.DesiredAccess = PRINTER_ACCESS_USE

        'Call the API to obtain a handle to the printer.
        'If an error occurs, display the error.
        result = WINAPI.OpenPrinter(PrinterName, hPrinter, pDefaults)
        If result = 0 Then

            CheckPrinter = "Cannot open printer " & PrinterName & _
               ", Error: " & Marshal.GetLastWin32Error()
            Exit Function
        End If

        'Initialize the BytesNeeded variable.
        BytesNeeded = 0

        'Clear the error object.
        Err.Clear()

        'Determine the buffer size that is required to obtain the printer information.
        result = WINAPI.GetPrinter(hPrinter, 2, 0&, 0, BytesNeeded)
        'Display the error message that you receive when you call the GetPrinter function, 
        'and then close the printer handle.
        If Marshal.GetLastWin32Error() <> ERROR_INSUFFICIENT_BUFFER Then
            CheckPrinter = " > GetPrinter Failed on initial call! <"
            WINAPI.ClosePrinter(hPrinter)
            Exit Function
        End If
        ReDim PrinterInfo(BytesNeeded)
        ByteBuf = BytesNeeded

        'Call the GetPrinter function to obtain the status.
        result = WINAPI.GetPrinter(hPrinter, 2, PrinterInfo(0), ByteBuf, _
          BytesNeeded)

        'Check for any errors.
        If result = 0 Then
            'Get the error.
            LastError = Marshal.GetLastWin32Error()

            'Display the error message, and then close the printer handle.
            CheckPrinter = "Could not get Printer Status!  Error = " _
               & LastError
            WINAPI.ClosePrinter(hPrinter)
            Exit Function
        End If

        'Copy the contents of the printer status byte array into a
        'PRINTER_INFO_2 structure.
        PI2 = CType(DatatoDeserial(PrinterInfo, GetType(PRINTER_INFO_2), 1), PRINTER_INFO_2)
        PrinterStr = CheckPrinterStatus(PI2.Status)

        'Add the printer name, the driver, and the port to the text box.
        PrinterStr = PrinterStr & "Printer Name = " & _
          GetString(PI2.pPrinterName) & vbCrLf
        PrinterStr = PrinterStr & "Printer Driver Name = " & _
          GetString(PI2.pDriverName) & vbCrLf
        PrinterStr = PrinterStr & "Printer Port Name = " & _
          GetString(PI2.pPortName) & vbCrLf

        'Call the API to obtain the buffer size that is required.
        result = WINAPI.EnumJobs(hPrinter, 0, &HFFFFFFFF, 2, JobInfo, 0, BytesNeeded, NumJI2)
        If result = 0 Then
            'Display the error, and then close the printer handle.
            LastError = Marshal.GetLastWin32Error()
            CheckPrinter = " > EnumJobs Failed on initial call! <  Error = " _
               & LastError
            WINAPI.ClosePrinter(hPrinter)
            Exit Function
        End If

        'If no current jobs exist, display the message.
        If BytesNeeded = 0 Then
            JobStr = "No Print Jobs!"
        Else
            'Resize the byte array to hold information about the print jobs.
            ReDim JobInfo(BytesNeeded - 1)

            'Call the API to obtain the print job information.
            result = WINAPI.EnumJobs(hPrinter, 0, &HFFFFFFFF, 2, JobInfo, _
                BytesNeeded, BytesNeeded, NumJI2)

            'Check for errors.
            If result = 0 Then
                'Display the error, and then close the printer handle.
                LastError = Marshal.GetLastWin32Error()
                CheckPrinter = " > EnumJobs Failed on second call! <  Error = " _
                   & LastError
                WINAPI.ClosePrinter(hPrinter)
                Exit Function
            End If
            ReDim JI2(NumJI2)

            'Copy the contents of print job info byte array into a
            'JOB_INFO_2 structure.
            Try
                For intCount = 0 To NumJI2 - 1 ' Loop through jobs and obtain the job information.
                    Dim test As Object
                    JI2(intCount) = CType(DatatoDeserial(JobInfo, _
                        GetType(JOB_INFO_2), intCount + 1), JOB_INFO_2)

                    JobStr = JobStr & "Job ID = " & JI2(intCount).PrinterJobId & _
                       vbCrLf & "Total Pages = " & JI2(intCount).TotalPages & vbCrLf

                    tempStr = ""
                    'Check for a ready state.
                    If JI2(intCount).pStatus = 0& Then   ' If pStatus is Null, check Status.
                        If JI2(intCount).pStatus = 0 Then
                            tempStr = tempStr & "Ready!  " & vbCrLf
                        Else  'Check for the various print job states.
                            If (JI2(intCount).pStatus And JOB_STATUS_SPOOLING) Then
                                tempStr = tempStr & "Spooling  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_OFFLINE) Then
                                tempStr = tempStr & "Off line  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_PAUSED) Then
                                tempStr = tempStr & "Paused  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_ERROR) Then
                                tempStr = tempStr & "Error  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_PAPEROUT) Then
                                tempStr = tempStr & "Paper Out  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_PRINTING) Then
                                tempStr = tempStr & "Printing  "
                            End If

                            If (JI2(intCount).pStatus And JOB_STATUS_USER_INTERVENTION) Then
                                tempStr = tempStr & "User Intervention Needed  "
                            End If

                            If Len(tempStr) = 0 Then
                                tempStr = "Unknown Status of " & JI2(intCount).PrinterStatus
                            End If
                        End If
                    Else

                        tempStr = Pointer_to_String(JI2(intCount).pStatus)
                    End If

                    'Report the job status.
                    JobStr = JobStr & tempStr & vbCrLf
                Next intCount
            Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try
        End If
        'Close the printer handle.
        WINAPI.ClosePrinter(hPrinter)
    End Function

    
End Class