Control functions

The following operators support these data types:

= == != []

The index operator [ ] (starting with 1) can only be used for read-only access, so the content of a variable of type langstring cannot be changed using the operator. Using the index operator on a variable of type langstring returns a variable of the type string. Use the function setLangString() to change the contents of a variable of the type langString. When a langString variable is assigned to a string variable, then the entry in the current language from the langString is assigned to the string variable.

Example

Assume that three languages are supported, s[1]...s[3]. The active language has the index 1 here. The result of the first Debug instruction -- DebugN(-a,-b) in the example then reads ["German" "Hungarian" "English"] ["" "" ""].

The assignment of a value to a[1] fails, because the assignment operator only allows read operations.

main()
{
   langString a, b;
   dyn_string s;
   string text;
   s[1] = "German";
   s[2] = "Hungarian";
   s[3] = "English";
   a = s;
   DebugN(a, b );
   text = a[2];
   DebugN(text); // ["English"]
   a[1] = "anything"; // Error, but no message in Logviewer
   text = "Active is: " + a;
   DebugN(text); // -> ["Active is: Hungarian"]
   a = b;
   if ( a == b ) ...
  if ( a != b ) ...
}

Note

The absolute index for the languages in WinCC OA (see file search) depends on the relative index of the project languages.