convert all the keys to *****

hi

how can i convert all the keys for the user how enter for example his passwort
to char ********

It depends on your OS and compiler.
Do a board search, this is a common question.

Here's a Windows API version. Remember to include windows.h...

Code:

---

char *getPass(char *szBuffer, size_t len)
{
        size_t i;
        HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
        HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
        DWORD dwOld, dwNumRead, dwNumWritten;
        if((hIn) && (hOut))
        {
                if(GetConsoleMode(hIn,&dwOld))
                {
                        if(SetConsoleMode(hIn,ENABLE_PROCESSED_INPUT))
                        {
                                for(i=0;i<len;i++)
                                {
                                        if(ReadConsole(hIn,&szBuffer[i],1,&dwNumRead,NULL))
                                        {
                                                if(szBuffer[i] == '\r')
                                                {
                                                        WriteConsole(hOut,"\n",1,&dwNumWritten,NULL);
                                                        szBuffer[i] = '\0';
                                                        break;
                                                }
                                                else WriteConsole(hOut,"*",1,&dwNumWritten,NULL);
                                        }
                                        else break;
                                }
                                SetConsoleMode(hIn,dwOld);
                                return szBuffer;
                        }
                }
        }
        return NULL;
}

---

If using the WIN32 API, the edit control has a 'password' style ES_PASSWORD which will automatically replace text with asteriks.

but what is the size_t ......................

size_t is a data type in the standard C library, inside stdio.h. If size_t is not defined in windows.h, which I believe it is, you can include it in your C++ program by including cstdio.

GIYF.

I think size_t is associated with <cstddef>.

http://www.cplusplus.com/reference/c...ef/size_t.html

Edit: Actually the same site indicates that it's also in <cstdio>. I'm confused. Why is it guaranteed to be defined in more than one standard header file?

Edit: This is important to me since my code uses std::size_t a lot (and I always qualify it with std:: since I don't think it's guaranteed to be in the global namespace).

This site names 4 header files where size_t is define:

• stdio.h
  
• stddef.h
  
• stdlib.h
  
• string.h

The date type is important for strings, as well as malloc() and other functions, so I guess they chose the route of defining it quite a few times as opposed to just keeping it in one header file that all the others would be dependent upon.