_wrename in WinApi app.

[Foxar]

So i am having bit of a problem. _wrename is not working out for me, and returns bizzare values, instead of 0 (succes) it returns 2 or 22;
Here is part of the code:

spec = "\u202E";
exe = ".exe";
oldname2wexe = s2ws(oldname);
oldname = oldname.substr(0, oldname.find(".", 0));
oldname2 = s2ws(oldname);
newname2 = s2ws(newname);
extension2 = s2ws(extension);
spec2 = s2ws(spec);
exe2 = s2ws(exe);
newname2 = oldname2 + spec2 + extension2 + exe2;
rename(sNazwaPliku, newname.c_str());
MessageBoxW(hwnd, oldname2.c_str(), NULL, MB_OK);
if(_wrename(oldname2wexe.c_str(), newname2.c_str()) == 0)
      MessageBox(hwnd, "Sucessfull rename.", "Succes", MB_OK);
else
{
	error = errno;
	stream << error;
	stream >> number;
	MessageBox(hwnd, "Failure", number.c_str(), MB_OK);
}
break;

Here it try to do _wrename, with (as you can see above) i am trying to use unicode right-to-left override, U202E,"\u202E". This causes "Failure" Message box with title either 2 or 22, instead of "succesfull rename" messagebox. However, if i remove "\" from spec, and make the unicode character a simple string, it renames the file, and spawns "Succesfull rename" messagebox.

if(_wrename(oldname2wexe.c_str(), newname2.c_str()) == 0)
		MessageBox(hwnd, "Sucessfull rename.", "Succes", MB_OK);
	else
	{
		error = errno;
		stream << error;
		stream >> number;
		MessageBox(hwnd, "Failure", number.c_str(), MB_OK);
	}

Excuse me if code is not fully readable, but i think it's a simple mistake i made somewhere and i will be really thankfull to someone who will help.

Im short: Why using a unicode "\u202E" in the wstring that is the newname argument in _wrename, causes errors and fails at renaming the file ?


EDIT: Also to clear things up i would like to add that program is supposed to pick a file, remove the ".exe" extension, then insert the override unicode, areversed fileformat that user chooses, and .exe again, which should then display something like "asdfexe.png", since unicode would flip the characters.

[ne555]

> This causes "Failure" Message box with title either 2 or 22, instead of "succesfull rename" messagebox.
http://www.cplusplus.com/reference/cstdio/perror/
or compare `errno' against EACCES, ENOENT, EINVAL

[Foxar]

I already did but that does not help. If i compare 2 as secibd if errirs, aka "NOENT" that means that there's no such file as the one im writing. But the moment i remove the "/" from the unicode thing, it works, and instead of right-to-left override, it uses a string "u202E".

[Foxar]

Anybody here willing to help ?

EDIT: I compared errno against the errorcodes that ne555 told me to, seems that error is "EINVAL".