Knowledge Base Nr: 00293 dllarray.cs - http://www.swe-kaiser.de

c#: .net: win32-dll aufruf mit rückgabe von string array

  
##### c:

char* parser(int* count, const char* file)
{
  char* pArray[5];

  pArray[0] = dupstr("lulli");
  pArray[1] = dupstr("fritz");
  pArray[2] = dupstr("hugo");
  pArray[3] = dupstr("jupp");
  pArray[4] = dupstr("zupp");

  count = 5;

  return pArray;
}

##### c#

  [DllImport("parser.dll")]
  private static extern int parser(ref int count, string file);

  private void button1_Click(object sender, System.EventArgs e)
  {
    int count = 0;
    string file = "eepromContent.txt";
    int array = 0;

    string outs = "calling parser:\r\n";

    try
    {
      array = parser(ref count, file);

      outs += "count = " + count + "\r\n";

      IntPtr pa = (IntPtr)array;

      for (int i=0; i<count; i++)
      {
        IntPtr ptr = Marshal.ReadIntPtr(pa, i*IntPtr.Size);

        string line = Marshal.PtrToStringAnsi(ptr);
        Console.WriteLine(line);
        outs += "line: " + i + ": <" + line + ">\r\n";
      }
    }
    catch (Exception ex)
    {
      MessageBox.Show(ex.Message);
      outs += ex.Message;
    }

    textBox1.Text = outs;
  }