如何使用通用 Windows 应用程序将串行数据写入 COM 端口？

Question

通常 C# 应用程序使用 System.IO.Ports 像这样：

SerialPort port = new SerialPort("COM1"); 
port.Open(); 
port.WriteLine("test");`

但通用 Windows 应用程序不支持 System.IO.Ports 因此无法使用此方法。有谁知道如何通过 UWA 中的 COM 端口写入串行数据？

Answer 1

您可以使用 Windows.Devices.SerialCommunication and Windows.Storage.Streams.DataWriter 类:

The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.

通过向 Package.appxmanifest 添加以下功能：

<Capabilities>
  <DeviceCapability Name="serialcommunication">
    <Device Id="any">
      <Function Type="name:serialPort" />
    </Device>
  </DeviceCapability>
</Capabilities>

然后运行下面的代码：

using Windows.Devices.SerialCommunication;
using Windows.Devices.Enumeration;
using Windows.Storage.Streams;

//...   

string selector = SerialDevice.GetDeviceSelector("COM3"); 
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selector);
if(devices.Count > 0)
{
    DeviceInformation deviceInfo = devices[0];
    SerialDevice serialDevice = await SerialDevice.FromIdAsync(deviceInfo.Id);
    serialDevice.BaudRate = 9600;
    serialDevice.DataBits = 8;
    serialDevice.StopBits = SerialStopBitCount.Two;
    serialDevice.Parity = SerialParity.None;

    DataWriter dataWriter = new DataWriter(serialDevice.OutputStream);
    dataWriter.WriteString("your message here");
    await dataWriter.StoreAsync();
    dataWriter.DetachStream();
    dataWriter = null;
}
else
{
    MessageDialog popup = new MessageDialog("Sorry, no device found.");
    await popup.ShowAsync();
}

Answer 2

Microsoft 提供了一个访问和使用 com 端口的示例，使用 class SerialDevice，在通用 Windows 应用程序中，名为 CustomSerialDeviceAccess。

Microsoft 已将其发布在 GitHub 上。你可以在这里找到它：

https://github.com/microsoft/Windows-universal-samples/tree/master/Samples/CustomSerialDeviceAccess

Microsoft 关于示例应用程序的说明：

"This sample allows the user to configure and communicate with a Serial device. You can choose one of four scenarios:

Connect/Disconnect using Device Selection list; Configure the Serial device; Communicate with the Serial device; Register for Events on the Serial device"

参考资料：微软，GitHub