I get some undesired character by passing String from Labview to C# dll

[Risotto]

Hi,

I wrote a function in a C#-dll which I call from Labview. The parameter is a String. The dll works fine, call the function from LabVIEW too. But when I pass then following String "°C", I get the following String in my function "°C".

I seem to be a conversion problem between LabVIEW and C', but I can't find a solution.

Regards,

Risotto

[pincpanter]

Can you post the function declaration and the passing method you configured for the string?

Paolo

[Risotto]

Paolo,

The function is:

  public int WriteLine(String str)
  {
   String s = str;
   buffer.Add(s);
   return 0;
  }

VI, please see attached file.

I first create an instance of an FileWriter .NET object with "File.OpenFileWriter.vi" and put the reference in a shared variable.

Then, I call the VI "_File.WriteLine (String).vi" to pass the string to the instance. At this point, the String is "°C".

When the data arrives in the function WriteLine, the value of str is "°C".

Risotto

[Risotto]

Paolo,

Another time with the VI.....

The function is:

  public int WriteLine(String str)
  {
   String s = str;
   buffer.Add(s);
   return 0;
  }

VI, please see attached file.

I first create an instance of an FileWriter .NET object with "File.OpenFileWriter.vi" and put the reference in a shared variable.

Then, I call the VI "_File.WriteLine (String).vi" to pass the string to the instance. At this point, the String is "°C".

When the data arrives in the function WriteLine, the value of str is "°C".

Risotto

[Risotto]

Paolo,

The function is:

  public int WriteLine(String str)
  {
   String s = str;
   buffer.Add(s);
   return 0;
  }

VI, please see attached file.

I first create an instance of an FileWriter .NET object with "File.OpenFileWriter.vi" and put the reference in a shared variable.

Then, I call the VI "_File.WriteLine (String).vi" to pass the string to the instance. At this point, the String is "°C".

When the data arrives in the function WriteLine, the value of str is "°C".

Risotto

[Lycangeek]

I tried to reproduce your problem, but so far I can't. Please tell me

1. What version of LV are you using?

2. What version of .NET are you using?

3. What language are you running? Do you know which codepage your system is set to?

4. Can you post a simple, complete example? A simple .NET dll that just takes a string and returns it, and a string control with the default value set to the problem string?

I did #4 myself, and copied the string off the webpage, but the actual character value might have changed going from your system, to HTML, to my system, so putting it into the VI is the best option.