How can I read ASCII data?

[locodust6]

I tried with below code.

PLCData<char> devices = new(PlcDeviceType.W, 0x100, 256);
devices.ReadData();

StringBuilder sb = new();
for (int i = 0; i < 160; i++)
{
    sb.Append(devices[i]);
}
sb.ToString();

However, I get "McProtocol.PLCData`1[System.Char]".
How can I get the string?

[locodust6]

I was able to get it in the following way.

PLCData<short> devices = new(PlcDeviceType.W, 0x100, 256);
devices.ReadData();

StringBuilder sb = new();
for (int i = 0; i < 160; i++)
{
    string str = ASCIIEncoding.ASCII.GetString(Convert.FromHexString(devices[i].ToString("X2")));
    if (str == "\0") break;
    sb.Append(str);
}
sb.ToString();

Is there a smarter way or an official way?

[ping9719]

支持直接转的类型有：Boolean，Int32，Int16，UInt16，UInt32，Single，Char
我开放出来了Bytes，在版本 v2.1.6
你可以试试：（我也不知道是否可行，我没有测试环境，如果不行请告诉我）
`
//>= v2.1.6
PLCData devices = new(PlcDeviceType.W, 0x100, 256);
devices.ReadData();
Encoding.ASCII.GetString(devices.Bytes);

//< v2.1.6
var bytes = await mcProtocolTcp.ReadDeviceBlockByte(PlcDeviceType.W, 0x100, 256);
Encoding.ASCII.GetString(bytes);
`

[locodust6]

Thank you for your response.

However, since the byte order is reversed, it cannot be converted into a string as is.
For example, "ABCDEF" becomes "BADCFE".

Therefore, it was necessary to change the byte order as shown below and convert it to a string.

//It is necessary to loop to read all character strings, but it is omitted.
Encoding.ASCII.GetString(Convert.FromHexString(BinaryPrimitives.ReadInt16LittleEndian(bytes.AsSpan(intStart, intLength)).ToString("X2")))

---

Appendix

I was able to get it in the following way.

PLCData<short> devices = new(PlcDeviceType.W, 0x100, 256);
devices.ReadData();
byte[] devicesBytes = devices.Bytes;

byte[] cropBytes = bytes.AsSpan(0 * 2, 160 * 2).ToArray();
byte[] trimdBytes = cropBytes.TakeWhile(x => x != 0).ToArray();
byte[] sortedBytes = new byte[trimdBytes.Length];
for (int i = 0; i < sortedBytes.Length; i += 2)
{
    if (i == sortedBytes.Length -1)
        {
            sortedBytes[i] = trimdBytes[i];
            break;
        }
        sortedBytes[i] = trimdBytes[i + 1];
        sortedBytes[i + 1] = trimdBytes[i];
}

Encoding.ASCII.GetString(sortedBytes);

[ping9719]

高低位转换需要自己转换，不是很难。不提供的原因是一般都是为ABCDE这样的，你自己转换就行了。
我为你提供一段代码思路：

    byte[] bytes = Encoding.ASCII.GetBytes("BADCFEG");
    for (int i = 0; i < bytes.Length - 1; i += 2)
        (bytes[i], bytes[i + 1]) = (bytes[i + 1], bytes[i]);
    //ABCDEFG
    string re = Encoding.ASCII.GetString(bytes);

[locodust6]

Thank you.

I will refer to it.
Since it is a process that is commonly used, I would be happy if it could be provided by the ToString() method.

[ping9719]

string 和 int bool .... 不同，你可以自己写一个类来完成自己的特殊化需求。
然后你把你的代码发出来（我试了一下，我的代码不是很合理），我试试能不能加入到代码中，提供给所有的人使用。

Please provide your code for my reference.

[pangfd]

请教一下LZ，如何读取浮点数据类型

[ping9719]

请教一下LZ，如何读取浮点数据类型

需要自己转换一下，可以试试我的新项目吧 read("地址")就可以了 https://github.com/ping9719/IoT