Ошибка c4996 c getch

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Answers

• » I See result My Code On the screen My App Don’ Pause. I’m Confused That it. How Can I Stop my App & Pause this on the Screen?????»

  You’ve placed the _getch after return, _getch will never be executed and of course that your app won’t pause.

  Also note that you could use getchar, which is a standard C library function, instead of getch/_getch.

  • Marked as answer by
    David Cerac
    Monday, November 11, 2013 7:34 AM
  • Unmarked as answer by
    David Cerac
    Monday, November 11, 2013 7:34 AM
  • Marked as answer by
    David Cerac
    Monday, November 11, 2013 7:34 AM

• I Fine Solution……..

  Is solve for Example:

  #include <iostream>
  #include <conio.h>
  #include <stdio.h>
  
  using namespace std;
  
  int main()
  {
  	cout<<"welcom";
  	_getch ();
  	return 0;
  }
  

  • Marked as answer by
    David Cerac
    Monday, November 11, 2013 7:35 AM

Solution 4

As the error says, the name getch() is deprecated (as that was a Microsoft-specific extension), and _getch() is recommended instead. I’m not sure where POSIX comes into it; POSIX does not define getch(), but instead includes getchar() as specified by the ISO C standard (page 298, draft linked to because final standard is not free). The solution would be to do as suggested and use _getch(), or use the standard C getchar().

Solution 5

Why do you need this? Why not use getchar() if you need to capture a single character?

Comments

• Somewhere back in time I did some C and C++ in college, but I didn’t get to many attention to C++. Now I wish to pay some attention to C++ but when I’m using the getch() function, I get the warning from below.

  Warning C4996: ‘getch’: The POSIX name for this item is deprecated. Instead, use the ISO C++ conformant name: _getch. See online help for details.

  Now, I’m using VS 2005 express, and I don’t know what to do about this warning. I need to use getch() after I printf() an error message or something else which require a key hit.

  Can you help me with that?

  • Did you read the error message?

  • @jalf: The «error message» is wrong/misleading, so I don’t see how reading it would help…

  • @R..: No it isn’t. It very clearly states the compiler’s reason for issuing the warning, and it states just as clearly what they want you to do to avoid the warning. You and I may not agree with Microsoft’s unilateral decision to «deprecate» standard functions, but the warning very clearly explains the issue, whether or not you agree with the underlying reasoning. If you want the warning to go away, and the warning actually says «please use this function instead», then reading the warning certainly helps.

  • Mentioning POSIX is what’s wrong and misleading; this has nothing to do with POSIX. Moreover the function is not a standard function; it’s a function name used by conio (and I believe also curses) for interactive single-character reads from the keyboard with no buffering.

• getchar is line buffered, thus it will wait for a newline character. _getch() won’t, but return immediately. I can understand him sometimes it’s really useful («press x to zoom», for example).

• I don’t think it has anything to do with buffering. getchar() reads in a character at a time. There is then fgets and the entire range of Xscanf() functions (albeit difficult to use). But as I said, it is difficult to suggest something without proper context, particularly a non-standard extension.

• getch has little to do with getchar. Rather it’s a conio (and I believe also curses) interface whose purpose is to interactively read a single character from the keyboard without buffering/delay.

• Could you explain why the asker should use one instead of the other? Fixing the problem is good but understanding the problem and why the solution works is even better.

• I’m not sure cin / cing.get works eg with arrow keys

• POSIX doesn’t come into it in the case of this particular function, but most of the functions that were deprecated in favour of underscore versions were POSIX-like functions such as open or mkdir. Guess they just didn’t want to bother creating a separate warning message for the few exceptions.

• Actually there is a difference between getchar and getch. getch blocks until some key is pressed. getchar blocks until enter is pressed.

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