Textfields not accepting UMLAUT (ÄÜÖ) when using SetText()

[buzzdx]

Hi,

I just tried to use the SetText method on a textfield with a value containing "ä". This results in an exception being thrown: std::range_error.

The following code reproduces the error:

auto txttarget = CreateTextField(515, 5, 400, 24, detailpanel);
txttarget->SetText("ä");

It's the same for ö and ü. Am I doing something wrong or is this a bug?

[Josh]

Try this:

txttarget->SetText(L"ä");

 

[buzzdx]

So the problem is I'm not using the right char set? In my application the user enters something into a textbox. Then it gets stored into a string, gets modified and put back into the textfield, which is where the exception is thrown. Do I need to use wstring instead of string, or your WString class?

I tried to convert the modified sting variable to your WString type like:

txt->SetText(Wstring(stringvar));

but that didn't work either.

[buzzdx]

So I got it working now. The problem was indeed that I was using std::string to work on the field data. Simply converting it by creating a new WString from the string then did not work either. The solution is to just use wstring and not string to get and modify the data and finally update the data in the textfield. If you, for some reason, have to use string somewhere in the code and need to convert it to wstring you can use this code:

std::wstring S2WS(const std::string& s)
{
  int len;
  int slength = (int)s.length() + 1;
  len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);
  wchar_t* buf = new wchar_t[len];
  MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
  std::wstring r(buf);
  delete[] buf;
  return r;
}

 

[Josh]

There's no reason to ever not use std::wstring / WString. std::string lacks the capacity for funny characters. You can convert a WString to UTF8 and back, but as I have explained earlier, UTF8 is evil and all of its proponents should be burned at the stake for heresy and crimes against humanity:

 

[buzzdx]

Well, to be honest I never had this problem before and have been working with std::string like .. forever basically. I'm not sure what you mean by funny chars. If you mean ä, ü, ö etc., it usually works just fine in my other applications which use wxWidgets for UI and also databases like SQLite or MySQL. If you mean like smileys or something, then yeah, std::string can't use that. Anyway, problem solved, thanks ?

While writing this I read the post you linked xD Nicely written ^^

[Josh]

You're probably using UTF-8 strings, which are basically a compressed string format. The problem is that common operations like search and replace do not work very well since you can't predict the byte position of a character in the string without reading the entire string up to that character.