public override async Task <bool> PrintFromURLAsync(string url, PrintJobConfiguration printJobConfiguration)
{
bool result = false;
try
{
if (PrintFromURLAsyncSupported)
{
WebViewPrintClientSubclass webViewClientSubclass = new WebViewPrintClientSubclass(url, printJobConfiguration); // TODO - check that this is disposed
webViewClientSubclass.Run();
result = true;
}
}
catch (Java.Lang.Exception jlex)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(jlex);
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (System.Exception ex)
{
await PrintStatusReporting.ReportExceptionAsync(ex);
}
#pragma warning restore CA1031 // Do not catch general exception types
return(result);
}
public override async Task <bool> PrintWebViewAsync(
Page parentPage,
WebView webView,
IWebViewAdditionalFunctions webViewAdditionFunctions,
PrintJobConfiguration printJobConfiguration)
{
bool result = false;
try
{
if (PrintWebViewAsyncSupported &&
(webViewAdditionFunctions?.NativeControl is Android.Webkit.WebView nativeWebView))
{
PrintServiceAndroidHelper.PrintFromWebView(nativeWebView, printJobConfiguration);
result = true;
}
}
catch (Java.Lang.Exception jlex)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(jlex);
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (System.Exception ex)
{
await PrintStatusReporting.ReportExceptionAsync(ex);
}
#pragma warning restore CA1031 // Do not catch general exception types
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="pages"></param>
/// <param name="destination"></param>
/// <param name="cancellationSignal"></param>
/// <param name="callback"></param>
public override async void OnWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback)
{
_input = null;
_output = null;
try
{
_input = new FileInputStream(FileToPrint); // if we use using on this, we get an ObjectDisposedException // TODO - investigate further
_output = new FileOutputStream(destination.FileDescriptor); // if we use using on this, we get an ObjectDisposedException // TODO - investigate further
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = _input.Read(buf)) > 0)
{
_output.Write(buf, 0, bytesRead);
}
callback.OnWriteFinished(new PageRange[] { PageRange.AllPages });
}
catch (Java.IO.FileNotFoundException ee)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(ee);
}
catch (Java.Lang.Exception jlex)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(jlex);
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (System.Exception e)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(e);
}
#pragma warning restore CA1031 // Do not catch general exception types
finally
{
try
{
if (!(_input is null))
{
_input.Close();
_input = null;
}
if (!(_output is null))
{
_output.Close();
_output = null;
}
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (System.Exception e)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(e);
}
#pragma warning restore CA1031 // Do not catch general exception types
}
}
/// <summary>
/// Unwire all events as part of cleanup.
/// </summary>
public virtual void UnwireAllEvents() => Xamarin.Forms.Device.BeginInvokeOnMainThread(
async() =>
{
try
{
if (_printManager != null)
{
PrintManagerHelper.Instance.ClearPrintTaskRequestedHandler(_printManager);
//_printManager.PrintTaskRequested -= PrintTaskRequested;
_printManager = null;
}
if (_printTask != null)
{
_printTask.Completed -= PrintTaskCompleted;
//_printTask.Previewing -= PrintTask_Previewing;
//_printTask.Progressing -= PrintTask_Progressing;
//_printTask.Submitting -= PrintTask_Submitting;
#if DEBUG
DecrementCompletedCount();
//DecrementPreviewing();
//DecrementProgressing();
//DecrementSubmitting();
#endif
Windows.Graphics.Printing.OptionDetails.PrintTaskOptionDetails printDetailedOptions
= Windows.Graphics.Printing.OptionDetails.PrintTaskOptionDetails.GetFromPrintTaskOptions(_printTask.Options);
if (printDetailedOptions != null)
{
printDetailedOptions.OptionChanged -= PrintDetailedOptions_OptionChanged;
#if DEBUG
DecrementOptionChangedCount();
#endif
}
}
if (_printDocument != null)
{
_printDocument.GetPreviewPage -= GetPrintPreviewPage;
_printDocument.Paginate -= CreatePrintPreviewPages;
_printDocument.AddPages -= AddPrintPages;
#if DEBUG
DecrementGetPreviewPageCount();
DecrementPaginateCount();
DecrementAddPagesCount();
#endif
}
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
{
await PrintStatusReporting.ReportExceptionSilentlyAsync(ex);
}
#pragma warning restore CA1031 // Do not catch general exception types
});