Se produce cuando se necesita el resultado que se va a imprimir para la página actual.
Espacio de nombres: System.Drawing.Printing
Ensamblado: System.Drawing (en system.drawing.dll)
Visual Basic (Declaración)
Public Event PrintPage As PrintPageEventHandler
Dim instance As PrintDocument
Dim handler As PrintPageEventHandler
AddHandler instance.PrintPage, handler
public event PrintPageEventHandler PrintPage
public:
event PrintPageEventHandler^ PrintPage {
void add (PrintPageEventHandler^ value);
void remove (PrintPageEventHandler^ value);
}
/** @event */
public void add_PrintPage (PrintPageEventHandler value)
/** @event */
public void remove_PrintPage (PrintPageEventHandler value)
JScript admite el uso de eventos, pero no admite la declaración de eventos nuevos.
Para especificar el resultado que se va a imprimir, se utilizan Graphics que se incluyen en PrintPageEventArgs. Por ejemplo, para especificar una línea de texto que debe imprimirse, hay que dibujar el texto mediante el método System.Drawing.Graphics.DrawString.
Además de especificar el resultado, se puede indicar si deben imprimirse más páginas estableciendo el valor de la propiedad PrintPageEventArgs.HasMorePages en true. El valor predeterminado es false, lo que indica que no quedan más páginas para imprimir. La configuración de páginas individuales también puede modificarse a través de PageSettings y el trabajo de impresión se puede cancelar estableciendo la propiedad PrintPageEventArgs.Cancel en true. Para imprimir cada página de un documento con una configuración de página diferente, hay que controlar el evento QueryPageSettings.
Para asociar el evento al controlador de eventos, hay que agregar una instancia del delegado PrintPageEventHandler al evento. Se llama al controlador de eventos siempre que se produce el evento. Para obtener más información sobre cómo controlar eventos con delegados, vea Eventos y delegados.
En el siguiente ejemplo de código se muestra cómo controlar el evento PrintPage.
Utilice los espacios de nombres System.Drawing, System.Drawing.Printing y System.IO para este ejemplo.
Public Class PrintingExample
Inherits System.Windows.Forms.Form
Private components As System.ComponentModel.Container
Private printButton As System.Windows.Forms.Button
Private printFont As Font
Private streamToPrint As StreamReader
Public Sub New()
' The Windows Forms Designer requires the following call.
InitializeComponent()
End Sub
' The Click event is raised when the user clicks the Print button.
Private Sub printButton_Click(sender As Object, e As EventArgs)
Try
streamToPrint = New StreamReader("C:\My Documents\MyFile.txt")
Try
printFont = New Font("Arial", 10)
Dim pd As New PrintDocument()
AddHandler pd.PrintPage, AddressOf Me.pd_PrintPage
pd.Print()
Finally
streamToPrint.Close()
End Try
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
' The PrintPage event is raised for each page to be printed.
Private Sub pd_PrintPage(sender As Object, ev As PrintPageEventArgs)
Dim linesPerPage As Single = 0
Dim yPos As Single = 0
Dim count As Integer = 0
Dim leftMargin As Single = ev.MarginBounds.Left
Dim topMargin As Single = ev.MarginBounds.Top
Dim line As String = Nothing
' Calculate the number of lines per page.
linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics)
' Print each line of the file.
While count < linesPerPage
line = streamToPrint.ReadLine()
If line Is Nothing Then
Exit While
End If
yPos = topMargin + count * printFont.GetHeight(ev.Graphics)
ev.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, New StringFormat())
count += 1
End While
' If more lines exist, print another page.
If Not (line Is Nothing) Then
ev.HasMorePages = True
Else
ev.HasMorePages = False
End If
End Sub
' The Windows Forms Designer requires the following procedure.
Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container()
Me.printButton = New System.Windows.Forms.Button()
Me.ClientSize = New System.Drawing.Size(504, 381)
Me.Text = "Print Example"
printButton.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft
printButton.Location = New System.Drawing.Point(32, 110)
printButton.FlatStyle = System.Windows.Forms.FlatStyle.Flat
printButton.TabIndex = 0
printButton.Text = "Print the file."
printButton.Size = New System.Drawing.Size(136, 40)
AddHandler printButton.Click, AddressOf printButton_Click
Me.Controls.Add(printButton)
End Sub
' This is the main entry point for the application.
Public Shared Sub Main()
Application.Run(New PrintingExample())
End Sub
End Class
public class PrintingExample : System.Windows.Forms.Form
{
private System.ComponentModel.Container components;
private System.Windows.Forms.Button printButton;
private Font printFont;
private StreamReader streamToPrint;
public PrintingExample() : base()
{
// The Windows Forms Designer requires the following call.
InitializeComponent();
}
// The Click event is raised when the user clicks the Print button.
private void printButton_Click(object sender, EventArgs e)
{
try
{
streamToPrint = new StreamReader
("C:\\My Documents\\MyFile.txt");
try
{
printFont = new Font("Arial", 10);
PrintDocument pd = new PrintDocument();
pd.PrintPage += new PrintPageEventHandler
(this.pd_PrintPage);
pd.Print();
}
finally
{
streamToPrint.Close();
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
// The PrintPage event is raised for each page to be printed.
private void pd_PrintPage(object sender, PrintPageEventArgs ev)
{
float linesPerPage = 0;
float yPos = 0;
int count = 0;
float leftMargin = ev.MarginBounds.Left;
float topMargin = ev.MarginBounds.Top;
string line = null;
// Calculate the number of lines per page.
linesPerPage = ev.MarginBounds.Height /
printFont.GetHeight(ev.Graphics);
// Print each line of the file.
while(count < linesPerPage &&
((line=streamToPrint.ReadLine()) != null))
{
yPos = topMargin + (count *
printFont.GetHeight(ev.Graphics));
ev.Graphics.DrawString(line, printFont, Brushes.Black,
leftMargin, yPos, new StringFormat());
count++;
}
// If more lines exist, print another page.
if(line != null)
ev.HasMorePages = true;
else
ev.HasMorePages = false;
}
// The Windows Forms Designer requires the following procedure.
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.printButton = new System.Windows.Forms.Button();
this.ClientSize = new System.Drawing.Size(504, 381);
this.Text = "Print Example";
printButton.ImageAlign =
System.Drawing.ContentAlignment.MiddleLeft;
printButton.Location = new System.Drawing.Point(32, 110);
printButton.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
printButton.TabIndex = 0;
printButton.Text = "Print the file.";
printButton.Size = new System.Drawing.Size(136, 40);
printButton.Click += new System.EventHandler(printButton_Click);
this.Controls.Add(printButton);
}
// This is the main entry point for the application.
public static void Main(string[] args)
{
Application.Run(new PrintingExample());
}
}
public ref class PrintingExample: public System::Windows::Forms::Form
{
private:
System::ComponentModel::Container^ components;
System::Windows::Forms::Button^ printButton;
System::Drawing::Font^ printFont;
StreamReader^ streamToPrint;
public:
PrintingExample()
: Form()
{
// The Windows Forms Designer requires the following call.
InitializeComponent();
}
private:
// The Click event is raised when the user clicks the Print button.
void printButton_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
try
{
streamToPrint = gcnew StreamReader( "C:\\My Documents\\MyFile.txt" );
try
{
printFont = gcnew System::Drawing::Font( "Arial",10 );
PrintDocument^ pd = gcnew PrintDocument;
pd->PrintPage += gcnew PrintPageEventHandler( this, &PrintingExample::pd_PrintPage );
pd->Print();
}
finally
{
streamToPrint->Close();
}
}
catch ( Exception^ ex )
{
MessageBox::Show( ex->Message );
}
}
// The PrintPage event is raised for each page to be printed.
void pd_PrintPage( Object^ /*sender*/, PrintPageEventArgs^ ev )
{
float linesPerPage = 0;
float yPos = 0;
int count = 0;
float leftMargin = (float)ev->MarginBounds.Left;
float topMargin = (float)ev->MarginBounds.Top;
String^ line = nullptr;
// Calculate the number of lines per page.
linesPerPage = ev->MarginBounds.Height / printFont->GetHeight( ev->Graphics );
// Print each line of the file.
while ( count < linesPerPage && ((line = streamToPrint->ReadLine()) != nullptr) )
{
yPos = topMargin + (count * printFont->GetHeight( ev->Graphics ));
ev->Graphics->DrawString( line, printFont, Brushes::Black, leftMargin, yPos, gcnew StringFormat );
count++;
}
// If more lines exist, print another page.
if ( line != nullptr )
ev->HasMorePages = true;
else
ev->HasMorePages = false;
}
// The Windows Forms Designer requires the following procedure.
void InitializeComponent()
{
this->components = gcnew System::ComponentModel::Container;
this->printButton = gcnew System::Windows::Forms::Button;
this->ClientSize = System::Drawing::Size( 504, 381 );
this->Text = "Print Example";
printButton->ImageAlign = System::Drawing::ContentAlignment::MiddleLeft;
printButton->Location = System::Drawing::Point( 32, 110 );
printButton->FlatStyle = System::Windows::Forms::FlatStyle::Flat;
printButton->TabIndex = 0;
printButton->Text = "Print the file.";
printButton->Size = System::Drawing::Size( 136, 40 );
printButton->Click += gcnew System::EventHandler( this, &PrintingExample::printButton_Click );
this->Controls->Add( printButton );
}
};
// This is the main entry point for the application.
int main()
{
Application::Run( gcnew PrintingExample );
}
public class PrintingExample extends System.Windows.Forms.Form
{
private System.ComponentModel.Container components;
private System.Windows.Forms.Button printButton;
private Font printFont;
private StreamReader streamToPrint;
public PrintingExample()
{
// The Windows Forms Designer requires the following call.
InitializeComponent();
} //PrintingExample
// The Click event is raised when the user clicks the Print button.
private void printButton_Click(Object sender, EventArgs e)
{
try {
streamToPrint = new StreamReader("C:\\My Documents\\MyFile.txt");
try {
printFont = new Font("Arial", 10);
PrintDocument pd = new PrintDocument();
pd.add_PrintPage(new PrintPageEventHandler(this.pd_PrintPage));
pd.Print();
}
finally {
streamToPrint.Close();
}
}
catch (System.Exception ex) {
MessageBox.Show(ex.get_Message());
}
} //printButton_Click
// The PrintPage event is raised for each page to be printed.
private void pd_PrintPage(Object sender, PrintPageEventArgs ev)
{
float linesPerPage = 0;
float yPos = 0;
int count = 0;
float leftMargin = ev.get_MarginBounds().get_Left();
float topMargin = ev.get_MarginBounds().get_Top();
String line = null;
// Calculate the number of lines per page.
linesPerPage = ev.get_MarginBounds().get_Height() /
printFont.GetHeight(ev.get_Graphics());
// Print each line of the file.
while ((count < linesPerPage &&
(line = streamToPrint.ReadLine()) != null)) {
yPos = topMargin + count * printFont.GetHeight(ev.get_Graphics());
ev.get_Graphics().DrawString(line, printFont, Brushes.get_Black(),
leftMargin, yPos, new StringFormat());
count++;
}
// If more lines exist, print another page.
if (line != null) {
ev.set_HasMorePages(true);
}
else {
ev.set_HasMorePages(false);
}
} //pd_PrintPage
// The Windows Forms Designer requires the following procedure.
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.printButton = new System.Windows.Forms.Button();
this.set_ClientSize(new System.Drawing.Size(504, 381));
this.set_Text("Print Example");
printButton.set_ImageAlign(System.Drawing.ContentAlignment.MiddleLeft);
printButton.set_Location(new System.Drawing.Point(32, 110));
printButton.set_FlatStyle(System.Windows.Forms.FlatStyle.Flat);
printButton.set_TabIndex(0);
printButton.set_Text("Print the file.");
printButton.set_Size(new System.Drawing.Size(136, 40));
printButton.add_Click(new System.EventHandler(printButton_Click));
this.get_Controls().Add(printButton);
} //InitializeComponent
// This is the main entry point for the application.
public static void main(String[] args)
{
Application.Run(new PrintingExample());
} //main
} //PrintingExample
Windows 98, Windows 2000 SP4, Windows Millennium, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter Edition
.NET Framework no admite todas las versiones de cada plataforma. Para obtener una lista de las versiones admitidas, vea Requisitos del sistema.
.NET Framework
Compatible con: 2.0, 1.1, 1.0