private async void CheckPrinterStatusButton_Clicked(object sender, EventArgs eventArgs)
{
SetInputEnabled(false);
PrinterStatusLabel.Text = "Checking printer status...";
Connection connection = null;
try {
await Task.Factory.StartNew(() => {
connection = CreateConnection();
connection.Open();
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection);
ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer);
PrinterStatus printerStatus = linkOsPrinter?.GetCurrentStatus() ?? printer.GetCurrentStatus();
Device.BeginInvokeOnMainThread(() => {
PrinterStatusLabel.Text = BuildPrinterStatusString(printerStatus);
});
});
} catch (Exception e) {
PrinterStatusLabel.Text = $"Error: {e.Message}";
await DisplayAlert("Error", e.Message, "OK");
} finally {
try {
connection?.Close();
} catch (ConnectionException) { }
SetInputEnabled(true);
}
}
private void GetPrinterStatus()
{
Connection printerConnection = null;
Task.Run(() => {
try {
printerConnection = connectionSelector.GetConnection();
printerConnection.Open();
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(printerConnection);
ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer);
ZebraPrinterStatus status = (linkOsPrinter != null) ? linkOsPrinter.GetCurrentStatus() : printer.GetCurrentStatus();
string[] printerStatusString = new PrinterStatusMessages(status).GetStatusMessage();
List <string> printerStatusPrefix = GetPrinterStatusPrefix(status);
StringBuilder sb = new StringBuilder();
foreach (string s in printerStatusPrefix)
{
sb.AppendLine(s);
}
foreach (string s in printerStatusString)
{
sb.AppendLine(s);
}
Application.Current.Dispatcher.Invoke(() => {
printerStatus.Text = sb.ToString();
});
} catch (ConnectionException e) {
MessageBoxCreator.ShowError(e.Message, "Connection Error");
} catch (ZebraPrinterLanguageUnknownException e) {
MessageBoxCreator.ShowError(e.Message, "Connection Error");
} finally {
if (printerConnection != null)
{
try {
printerConnection.Close();
} catch (ConnectionException) {
} finally {
SetTestButtonState(true);
}
}
else
{
SetTestButtonState(true);
}
}
});
}
private void TestConnectionString()
{
Task.Run(() => {
try {
ClearProgress();
connection = ZebraConnectionBuilder.Build(GetConnectionStringForSdk());
PublishProgress("Connection string evaluated as class type " + connection.GetType().Name);
connection.Open();
PublishProgress("Connection opened successfully");
if (IsAttemptingStatusConnection())
{
ZebraPrinterLinkOs printer = ZebraPrinterFactory.GetLinkOsPrinter(connection);
PublishProgress("Created a printer, attempting to retrieve status");
ZebraPrinterStatus status = printer.GetCurrentStatus();
PublishProgress("Is printer ready to print? " + status.isReadyToPrint);
}
else
{
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection);
PublishProgress("Created a printer, attempting to print a config label");
printer.PrintConfigurationLabel();
}
PublishProgress("Closing connection");
} catch (ConnectionException) {
MessageBoxCreator.ShowError("Connection could not be opened", "Error");
} catch (ZebraPrinterLanguageUnknownException) {
MessageBoxCreator.ShowError("Could not create printer", "Error");
} finally {
if (connection != null)
{
try {
connection.Close();
} catch (ConnectionException) { } finally {
connection = null;
SetTestButtonState(true);
}
}
else
{
SetTestButtonState(true);
}
}
});
}
/// <summary>
/// 获取打印机状态
/// </summary>
/// <returns></returns>
public PrinterStatus GetPrinterStatus()
{
lock (connectionHelper)
{
connection = null;
}
lock (printerHelper)
{
printer = null;
}
PrinterStatus printerStatus = null;
if (TryOpenPrinterConnection())
{
printer = GetPrinter();
if (printer != null)
{
try
{
ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer);
printerStatus = (linkOsPrinter != null) ? linkOsPrinter.GetCurrentStatus() : printer.GetCurrentStatus();
}
catch (Exception ex)
{
myEventLog.LogError("获取打印机状态出错！", ex);
}
finally
{
}
}
}
return(printerStatus);
}