Hay varias maneras diferentes de imprimir una página web en WebView2, lo que le ofrece varios niveles de facilidad de implementación y personalización.
Método
Descripción
ShowPrintUI
Abre el cuadro de diálogo Vista previa de impresión WebView2 o el cuadro de diálogo Imprimir del sistema operativo. Compatibilidad mínima y fácil de implementar para personalizar.
Print
Imprime silenciosamente el documento de nivel superior actual en WebView2 mediante la configuración de impresión especificada mediante programación opcional en una impresora. Puede usarlo para crear su propio cuadro de diálogo de vista previa de impresión o experiencia de impresión.
PrintToPdf
Imprime silenciosamente el documento de nivel superior actual en WebView2 en un archivo PDF. Puede usarlo para crear su propio código para imprimir el archivo PDF.
PrintToPdfStream
Imprime silenciosamente el documento de nivel superior actual en WebView2 en una secuencia PDF. Puede usarlo para crear su propio código para imprimir el PDF.
El método ShowPrintUI para abrir un cuadro de diálogo Imprimir
El ShowPrintUI método abre el cuadro de diálogo Vista previa de impresión de WebView2 o el cuadro de diálogo Imprimir del sistema operativo para el documento de nivel superior actual en el control WebView2. Con este enfoque, puede proporcionar fácilmente una experiencia de impresión familiar para los usuarios.
El Print método imprime silenciosamente el documento de nivel superior actual en el control WebView2 mediante la configuración de impresión opcional especificada mediante programación. Si desea crear su propio cuadro de diálogo Vista previa de impresión o crear su propia experiencia de impresión, puede usar este método. Esta API consta de un método asincrónico Print y un PrintSettings objeto .
Ejemplo 1: El método Print sin un cuadro de diálogo, con la configuración de impresión predeterminada
En este ejemplo se imprime la página web actual en la impresora predeterminada, con la configuración de impresión predeterminada, sin abrir un cuadro de diálogo Imprimir .
async void PrintToDefaultPrinter ()
{
string title = webView.CoreWebView2.DocumentTitle;
try
{
// Prints the current webpage, using the default printer and page settings.
// Passing null for PrintSettings causes the default print settings to be used.
CoreWebView2PrintStatus printStatus = await webView.CoreWebView2.PrintAsync(null);
if (printStatus == CoreWebView2PrintStatus.Succeeded)
{
MessageBox.Show(this, "Printing " + title + " document to printer succeeded", "Print to default printer");
}
else if (printStatus == CoreWebView2PrintStatus.PrinterUnavailable)
{
MessageBox.Show(this, "Printer is not available, offline or error state", "Print to default printer");
}
else
{
MessageBox.Show(this, "Printing " + title + " document to printer is failed", "Print to default printer");
}
}
catch (Exception)
{
MessageBox.Show(this, "Printing " + title + " document already in progress", "Print to default printer");
}
}
async void PrintToDefaultPrinter(object sender, RoutedEventArgs e)
{
string title = WebView2.CoreWebView2.DocumentTitle;
MessageDialog dialog = new MessageDialog("", "Print");
try
{
// Prints the current webpage by using the default printer and page settings.
// Passing null for PrintSettings causes the default print settings to be used.
CoreWebView2PrintStatus printStatus = await WebView2.CoreWebView2.PrintAsync(null);
if (printStatus == CoreWebView2PrintStatus.Succeeded)
{
dialog = new MessageDialog("Printing " + title +
" document to printer succeeded", "Print");
}
else if (printStatus == CoreWebView2PrintStatus.PrinterUnavailable)
{
dialog = new MessageDialog("Printer is not available, offline or error state", "Print");
}
else
{
dialog = new MessageDialog("Printing " + title +
" document to printer is failed", "Print");
}
}
catch (Exception)
{
dialog = new MessageDialog("Printing " + title +
" document already in progress", "Print");
}
await dialog.ShowAsync();
}
bool AppWindow::PrintToDefaultPrinter()
{
wil::com_ptr<ICoreWebView2_16> webView2_16;
CHECK_FAILURE(m_webView->QueryInterface(IID_PPV_ARGS(&webView2_16)));
wil::unique_cotaskmem_string title;
CHECK_FAILURE(m_webView->get_DocumentTitle(&title));
// Prints the current webpage, using the default printer and page settings.
// Passing nullptr for ICoreWebView2PrintSettings causes the default print settings to be used.
CHECK_FAILURE(webView2_16->Print(
nullptr, Callback<ICoreWebView2PrintCompletedHandler>(
[title = std::move(title), this](HRESULT errorCode,
COREWEBVIEW2_PRINT_STATUS printStatus) -> HRESULT
{
std::wstring message = L"";
if (errorCode == S_OK && printStatus == COREWEBVIEW2_PRINT_STATUS_SUCCEEDED)
{
message = L"Printing " + std::wstring(title.get()) +
L" document to printer succeeded";
}
else if (errorCode == S_OK && printStatus == COREWEBVIEW2_PRINT_STATUS_PRINTER_UNAVAILABLE)
{
message = L"Printer is not available, offline or error state";
}
else if (errorCode == E_ABORT)
{
message = L"Printing " + std::wstring(title.get()) +
L" document already in progress";
}
else
{
message = L"Printing " + std::wstring(title.get()) +
L" document to printer is failed";
}
AsyncMessageBox(message, L"Print to default printer");
return S_OK;
})
.Get()));
return true;
}
Ejemplo 2: El método Print para imprimir en una impresora especificada mediante la configuración de impresión personalizada
En este ejemplo se imprime la página web actual en una impresora específica, utilizando la configuración especificada.
async void PrintToPrinter()
{
string printerName = GetPrinterName();
CoreWebView2PrintSettings printSettings = GetSelectedPrinterPrintSettings(printerName);
string title = webView.CoreWebView2.DocumentTitle;
try
{
CoreWebView2PrintStatus printStatus = await webView.CoreWebView2.PrintAsync(printSettings);
if (printStatus == CoreWebView2PrintStatus.Succeeded)
{
MessageBox.Show(this, "Printing " + title + " document to printer succeeded", "Print to printer");
}
else if (printStatus == CoreWebView2PrintStatus.PrinterUnavailable)
{
MessageBox.Show(this, "Selected printer is not found, not available, offline or error state", "Print to printer");
}
else
{
MessageBox.Show(this, "Printing " + title + " document to printer is failed", "Print");
}
}
catch(ArgumentException)
{
MessageBox.Show(this, "Invalid settings provided for the specified printer", "Print");
}
catch (Exception)
{
MessageBox.Show(this, "Printing " + title + " document already in progress", "Print");
}
}
// Gets the printer name by displaying the list of installed printers to the user and
// returns the name of the user's selected printer.
string GetPrinterName()
{
// Use GetPrintQueues() of LocalPrintServer from System.Printing to get the list of locally installed printers.
// Display the list of printers to the user and get the desired printer to use.
// Return the name of the selected printer.
}
// Gets the print settings for the selected printer.
// You can also get the capabilities from the native printer API, and display them
// to the user to get the print settings for the current webpage and for the selected printer.
CoreWebView2PrintSettings GetSelectedPrinterPrintSettings(string printerName)
{
CoreWebView2PrintSettings printSettings = null;
printSettings = WebViewEnvironment.CreatePrintSettings();
printSettings.ShouldPrintBackgrounds = true;
printSettings.ShouldPrintHeaderAndFooter = true;
return printSettings;
// or
// Get PrintQueue for the selected printer and use GetPrintCapabilities() of PrintQueue from System.Printing
// to get the capabilities of the selected printer.
// Display the printer capabilities to the user along with the page settings.
// Return the user selected settings.
}
async void PrintToPrinter(object sender, RoutedEventArgs e)
{
string printerName = GetPrinterName();
CoreWebView2PrintSettings printSettings = GetSelectedPrinterPrintSettings(printerName);
string title = WebView2.CoreWebView2.DocumentTitle;
MessageDialog dialog = new MessageDialog("", "Print");
try
{
CoreWebView2PrintStatus printStatus =
await WebView2.CoreWebView2.PrintAsync(printSettings);
if (printStatus == CoreWebView2PrintStatus.Succeeded)
{
dialog = new MessageDialog("Printing " + title +
" document to printer succeeded", "Print to printer");
}
else if (printStatus == CoreWebView2PrintStatus.PrinterUnavailable)
{
dialog = new MessageDialog("Selected printer is not found, not available, " +
"offline or error state", "Print to printer");
}
else
{
dialog = new MessageDialog("Printing " + title +
" document to printer is failed", "Print");
}
}
catch (ArgumentException)
{
dialog = new MessageDialog("Invalid settings provided for the specified printer", "Print");
}
catch (Exception)
{
dialog = new MessageDialog("Printing " + title + " document already in progress", "Print");
}
await dialog.ShowAsync();
}
// Gets the printer name by displaying the list of installed printers to the user,
// and returns the user-selected printer.
string GetPrinterName()
{
// Use DeviceInformation.FindAllAsync to get the list of local printers with AQS as:
// System.Devices.HardwareIds:~~"PRINTENUM\LocalPrintQueue"
// Display the list of printers to the user, and get the desired printer to use.
// Return the name of the user's selected printer.
}
// Gets print settings for the selected printer.
// You can also get the capabilities from the printer APIs, and display them to the
// user to get the print settings for the current webpage and for the selected printer.
CoreWebView2PrintSettings GetSelectedPrinterPrintSettings(string printerName)
{
CoreWebView2PrintSettings printSettings = null;
printSettings = WebView2.CoreWebView2.Environment.CreatePrintSettings();
printSettings.ShouldPrintBackgrounds = true;
printSettings.ShouldPrintHeaderAndFooter = true;
return printSettings;
// or
// Get the print ticket and use PrintTicketCapabilities from
// Windows.Graphics.Printing.PrintTicket to get the capabilities of the selected printer.
// Display the printer capabilities to the user, along with the page settings.
// Return the user-selected settings.
}
struct SamplePrintSettings
{
COREWEBVIEW2_PRINT_ORIENTATION Orientation = COREWEBVIEW2_PRINT_ORIENTATION_PORTRAIT;
int Copies = 1;
int PagesPerSide = 1;
std::wstring Pages = L"";
COREWEBVIEW2_PRINT_COLLATION Collation = COREWEBVIEW2_PRINT_COLLATION_DEFAULT;
COREWEBVIEW2_PRINT_COLOR_MODE ColorMode = COREWEBVIEW2_PRINT_COLOR_MODE_DEFAULT;
COREWEBVIEW2_PRINT_DUPLEX Duplex = COREWEBVIEW2_PRINT_DUPLEX_DEFAULT;
COREWEBVIEW2_PRINT_MEDIA_SIZE Media = COREWEBVIEW2_PRINT_MEDIA_SIZE_DEFAULT;
double PaperWidth = 8.5;
double PaperHeight = 11;
double ScaleFactor = 1.0;
bool PrintBackgrounds = false;
bool HeaderAndFooter = false;
bool ShouldPrintSelectionOnly = false;
std::wstring HeaderTitle = L"";
std::wstring FooterUri = L"";
};
// Gets the printer name by displaying the list of installed printers to the user,
// and returns the user-selected printer.
std::wstring AppWindow::GetPrinterName()
{
// Use the Win32 EnumPrinters function to get the list of locally installed printers.
// Display the list of printers to the user and get the user-selected printer to use.
// Return the user-selected printer name.
}
// Gets the print settings for the selected printer.
// You can also get the capabilities from the native printer API, and display them
// to the user to get the print settings for the current webpage and for the
// selected printer.
SamplePrintSettings AppWindow::GetSelectedPrinterPrintSettings(std::wstring printerName)
{
SamplePrintSettings samplePrintSettings;
samplePrintSettings.PrintBackgrounds = true;
samplePrintSettings.HeaderAndFooter = true;
return samplePrintSettings;
// Or
// Use the Win32 DeviceCapabilitiesA function to get the capabilities of the selected printer.
// Display the printer capabilities to the user, along with the page settings.
// Return the user-selected settings.
}
bool AppWindow::PrintToPrinter()
{
std::wstring printerName = GetPrinterName();
// The host app's custom print settings, based on the user selection.
SamplePrintSettings samplePrintSettings = GetSelectedPrinterPrintSettings(printerName);
wil::com_ptr<ICoreWebView2_16> webView2_16;
CHECK_FAILURE(m_webView->QueryInterface(IID_PPV_ARGS(&webView2_16)));
wil::com_ptr<ICoreWebView2Environment6> webviewEnvironment6;
CHECK_FAILURE(m_webViewEnvironment->QueryInterface(IID_PPV_ARGS(&webviewEnvironment6)));
wil::com_ptr<ICoreWebView2PrintSettings> printSettings;
CHECK_FAILURE(webviewEnvironment6->CreatePrintSettings(&printSettings));
wil::com_ptr<ICoreWebView2PrintSettings2> printSettings2;
CHECK_FAILURE(printSettings->QueryInterface(IID_PPV_ARGS(&printSettings2)));
CHECK_FAILURE(printSettings2->put_Orientation(samplePrintSettings.Orientation));
CHECK_FAILURE(printSettings2->put_Copies(samplePrintSettings.Copies));
CHECK_FAILURE(printSettings2->put_PagesPerSheet(samplePrintSettings.PagesPerSide));
CHECK_FAILURE(printSettings2->put_PageRanges(samplePrintSettings.Pages.c_str()));
if (samplePrintSettings.Media == COREWEBVIEW2_PRINT_MEDIA_SIZE_CUSTOM)
{
CHECK_FAILURE(printSettings2->put_PageWidth(samplePrintSettings.PaperWidth));
CHECK_FAILURE(printSettings2->put_PageHeight(samplePrintSettings.PaperHeight));
}
CHECK_FAILURE(printSettings2->put_ColorMode(samplePrintSettings.ColorMode));
CHECK_FAILURE(printSettings2->put_Collation(samplePrintSettings.Collation));
CHECK_FAILURE(printSettings2->put_Duplex(samplePrintSettings.Duplex));
CHECK_FAILURE(printSettings2->put_ScaleFactor(samplePrintSettings.ScaleFactor));
CHECK_FAILURE(printSettings2->put_ShouldPrintBackgrounds(samplePrintSettings.PrintBackgrounds));
CHECK_FAILURE(printSettings2->put_ShouldPrintHeaderAndFooter(samplePrintSettings.HeaderAndFooter));
CHECK_FAILURE(printSettings2->put_HeaderTitle(samplePrintSettings.HeaderTitle.c_str()));
CHECK_FAILURE(printSettings2->put_FooterUri(samplePrintSettings.FooterUri.c_str()));
CHECK_FAILURE(printSettings2->put_PrinterName(printerName.c_str()));
wil::unique_cotaskmem_string title;
CHECK_FAILURE(m_webView->get_DocumentTitle(&title));
CHECK_FAILURE(webView2_16->Print(
printSettings.get(),
Callback<ICoreWebView2PrintCompletedHandler>(
[title = std::move(title), this](HRESULT errorCode,
COREWEBVIEW2_PRINT_STATUS printStatus) -> HRESULT
{
std::wstring message = L"";
if (errorCode == S_OK && printStatus == COREWEBVIEW2_PRINT_STATUS_SUCCEEDED)
{
message = L"Printing " + std::wstring(title.get()) +
L" document to printer succeeded";
}
else if (errorCode == S_OK && printStatus == COREWEBVIEW2_PRINT_STATUS_PRINTER_UNAVAILABLE)
{
message = L"Selected printer is not found, not available, offline or "
L"error state.";
}
else if (errorCode == E_INVALIDARG)
{
message = L"Invalid settings provided for the specified printer";
}
else if (errorCode == E_ABORT)
{
message = L"Printing " + std::wstring(title.get()) +
L" document already in progress";
}
else
{
message = L"Printing " + std::wstring(title.get()) +
L" document to printer is failed";
}
AsyncMessageBox(message, L"Print to printer");
return S_OK;
})
.Get()));
return true;
}
Método PrintToPdf para imprimir en un archivo PDF mediante la configuración de impresión personalizada
Imprime silenciosamente el documento de nivel superior actual en el control WebView2 en un archivo PDF. Para controlar completamente cómo se realiza la impresión, puede imprimir en un PDF y, a continuación, crear su propio código para imprimir el PDF.
Esta API consta de un método asincrónico PrintToPdf y un PrintSettings objeto . El PrintToPdf método acepta una ruta de acceso en la que se guardará el archivo PDF.
async void PrintToPdfCmdExecuted(object target, ExecutedRoutedEventArgs e)
{
if (_isPrintToPdfInProgress)
{
MessageBox.Show(this, "Print to PDF in progress", "Print To PDF");
return;
}
CoreWebView2PrintSettings printSettings = null;
string orientationString = e.Parameter.ToString();
if (orientationString == "Landscape")
{
printSettings = WebViewEnvironment.CreatePrintSettings();
printSettings.Orientation =
CoreWebView2PrintOrientation.Landscape;
}
Microsoft.Win32.SaveFileDialog saveFileDialog =
new Microsoft.Win32.SaveFileDialog();
saveFileDialog.InitialDirectory = "C:\\";
saveFileDialog.Filter = "PDF Files|*.pdf";
Nullable<bool> result = saveFileDialog.ShowDialog();
if (result == true) {
_isPrintToPdfInProgress = true;
bool isSuccessful = await webView.CoreWebView2.PrintToPdfAsync(
saveFileDialog.FileName, printSettings);
_isPrintToPdfInProgress = false;
string message = (isSuccessful) ?
"Print to PDF succeeded" : "Print to PDF failed";
MessageBox.Show(this, message, "Print To PDF Completed");
}
}
async void PrintToPdf(bool enableLandscape)
{
MessageDialog dialog = new MessageDialog("", "Print To PDF");
if (_isPrintToPdfInProgress)
{
dialog = new MessageDialog("Print to PDF in progress", "Print To PDF");
return;
}
CoreWebView2PrintSettings printSettings = null;
if (enableLandscape)
{
printSettings = WebView2.CoreWebView2.Environment.CreatePrintSettings();
printSettings.Orientation = CoreWebView2PrintOrientation.Landscape;
}
var savePicker = new Windows.Storage.Pickers.FileSavePicker();
savePicker.FileTypeChoices.Add("PDF Files", new List<string>() { ".pdf" });
savePicker.SuggestedFileName = "WebView2_PrintedPdf";
StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
_isPrintToPdfInProgress = true;
bool isSuccessful = await WebView2.CoreWebView2.PrintToPdfAsync(file.Path, printSettings);
_isPrintToPdfInProgress = false;
string message = (isSuccessful) ? "Print to PDF succeeded" : "Print to PDF failed";
dialog = new MessageDialog(message, "Print To PDF");
}
await dialog.ShowAsync();
}
void FileComponent::PrintToPdf(bool enableLandscape)
{
WCHAR defaultName[MAX_PATH] = L"WebView2_PrintedPdf.pdf";
OPENFILENAME openFileName = CreateOpenFileName(defaultName, L"PDF File\0*.pdf\0");
if (GetSaveFileName(&openFileName))
{
wil::com_ptr<ICoreWebView2PrintSettings> printSettings = nullptr;
if (enableLandscape)
{
wil::com_ptr<ICoreWebView2Environment5> webviewEnvironment5;
CHECK_FAILURE(m_appWindow->GetWebViewEnvironment()->QueryInterface(
IID_PPV_ARGS(&webviewEnvironment5)));
if (webviewEnvironment5)
{
CHECK_FAILURE(webviewEnvironment5->CreatePrintSettings(&printSettings));
CHECK_FAILURE(
printSettings->put_Orientation(COREWEBVIEW2_PRINT_ORIENTATION_LANDSCAPE));
}
}
wil::com_ptr<ICoreWebView2_7> webview2_7;
CHECK_FAILURE(m_webView->QueryInterface(IID_PPV_ARGS(&webview2_7)));
if (webview2_7)
{
m_printToPdfInProgress = true;
CHECK_FAILURE(webview2_7->PrintToPdf(
openFileName.lpstrFile, printSettings.get(),
Callback<ICoreWebView2PrintToPdfCompletedHandler>(
[this](HRESULT errorCode, BOOL isSuccessful) -> HRESULT {
CHECK_FAILURE(errorCode);
m_printToPdfInProgress = false;
auto showDialog = [isSuccessful] {
MessageBox(
nullptr,
(isSuccessful) ? L"Print to PDF succeeded"
: L"Print to PDF failed",
L"Print to PDF Completed", MB_OK);
};
m_appWindow->RunAsync([showDialog]() { showDialog(); });
return S_OK;
})
.Get()));
}
}
}
El método PrintToPdfStream para imprimir en un flujo PDF mediante la configuración de impresión personalizada
Imprime silenciosamente el documento de nivel superior actual en el control WebView2 en una secuencia PDF. Para controlar completamente cómo se realiza la impresión, puede imprimir en un PDF y, a continuación, crear su propio código para imprimir el PDF. Esta API consta de un método asincrónico PrintToPdfStream y un PrintSettings objeto .
async void PrintToPdfStream()
{
try
{
string title = webView.CoreWebView2.DocumentTitle;
// Passing null for PrintSettings causes the default print settings to be used.
System.IO.Stream stream = await webView.CoreWebView2.PrintToPdfStreamAsync(null);
DisplayPdfDataInPrintDialog(stream);
MessageBox.Show(this, "Printing " + title + " document to PDF Stream " +
((stream != null) ? "succeeded" : "failed"), "Print To PDF Stream");
}
catch(Exception exception)
{
MessageBox.Show(this, "Printing to PDF Stream failed: " + exception.Message, "Print to PDF Stream");
}
}
// Function to display current webpage PDF data in a custom Print Preview dialog.
void DisplayPdfDataInPrintDialog(Stream pdfData)
{
// You can display the printable PDF data to the user in a custom Print Preview dialog.
}
async void PrintToPdfStream(object sender, RoutedEventArgs e)
{
MessageDialog dialog = new MessageDialog("", "Print to PDF Stream");
try
{
string title = WebView2.CoreWebView2.DocumentTitle;
// Passing null for PrintSettings causes the default print settings to be used.
Windows.Storage.Streams.IRandomAccessStream stream =
await WebView2.CoreWebView2.PrintToPdfStreamAsync(null);
DisplayPdfDataInPrintDialog(stream);
dialog = new MessageDialog("Printing" + title + " document to PDF Stream "
+ ((stream != null) ? "succeeded" : "failed"), "Print To PDF Stream");
}
catch (Exception exception)
{
dialog = new MessageDialog("Printing to PDF Stream failed: " + exception.Message,
"Print to PDF Stream");
}
await dialog.ShowAsync();
}
// Function to display the current page PDF data in a custom Print Preview dialog.
void DisplayPdfDataInPrintDialog(Windows.Storage.Streams.IRandomAccessStream pdfData)
{
// You can display the printable PDF data to the user in a custom Print Preview dialog.
}
static void DisplayPdfDataInPrintDialog(IStream* pdfData)
{
// You can display the printable PDF data to the user in a custom Print Preview dialog.
}
bool AppWindow::PrintToPdfStream()
{
wil::com_ptr<ICoreWebView2_16> webView2_16;
CHECK_FAILURE(m_webView->QueryInterface(IID_PPV_ARGS(&webView2_16)));
wil::unique_cotaskmem_string title;
CHECK_FAILURE(m_webView->get_DocumentTitle(&title));
// Passing nullptr for ICoreWebView2PrintSettings causes the default print settings to be used.
CHECK_FAILURE(
webView2_16->PrintToPdfStream(
nullptr,
Callback<ICoreWebView2PrintToPdfStreamCompletedHandler>(
[title = std::move(title), this](HRESULT errorCode, IStream* pdfData) -> HRESULT
{
DisplayPdfDataInPrintDialog(pdfData);
std::wstring message = L"Printing " + std::wstring(title.get()) +
L" document to PDF Stream " +
((errorCode == S_OK && pdfData != nullptr) ? L"succeeded" : L"failed");
AsyncMessageBox(message, L"Print to PDF Stream");
return S_OK;
})
.Get()));
return true;
}
Consulte también
Impresión en Información general sobre las características y las API de WebView2.