Error c4996 strcat this function or variable may be unsafe

Здравствуйте, изучаю Win32 API, делаю все как в примере — (в примере используется VS 6, я пользуюсь VS Community 2015)

выдает ошибку:

Ошибка C4996
‘strcat’: This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
Hello2 c:usersгеоргийdocumentsvisual studio 2015projectsuniversalbasehello2kwnd.cpp

вот сам код:

///////////////////////////////////////////////////////////////////////////////
/// KWnd.cpp                                                                ///
///////////////////////////////////////////////////////////////////////////////

#include "KWnd.h"

KWnd::KWnd(LPCTSTR windowName, HINSTANCE hInst, int cmdShow,
	LRESULT(WINAPI *pWndProc)(HWND, UINT, WPARAM, LPARAM),
	LPCSTR menuName, int x, int y, int width, int height,
	UINT classStyle, DWORD windowStyle, HWND hParent)
{
	char szClassName[] = "KWndClass";

	wc.cbSize = sizeof(wc);
	wc.style = classStyle;
	wc.lpfnWndProc = pWndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInst;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.lpszMenuName = menuName;
	wc.lpszClassName = szClassName;
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

	// Регистрируем класс окна
	if (!RegisterClassEx(&wc)) {
		char msg[100] = "Не могу зарегестрировать class: ";
		strcat(msg, szClassName);
		MessageBox(NULL, msg, "Ошибка", MB_OK);
	}

	// Создаем окно
	hWnd = CreateWindow(szClassName, windowName, windowStyle,
		x, y, width, height, hParent, HMENU(NULL), hInst, NULL);

	if (!hWnd) {
		char text[100] = "Не могусоздать окно: ";
		strcat(text, windowName);
		MessageBox(NULL, text, "Ошибка", MB_OK);
		return;
	}

	// Показываем окно
	ShowWindow(hWnd, cmdShow);
}

Пожалуйста Подскажите что не так сделал?

2 Августа 2017

Время чтения: 5 минут

#include "stdafx.h"
#include <stdio.h>

int main() {
	int a, b;

	printf("Enter a: ");
	scanf("%d", &a);

	printf("Enter b: ");
	scanf("%d", &b);

	printf("a: %d, b: %dn", a, b);
	return 0;
}

Hello!

I programmed this member function for a «client» class, where I am receiving through command line something like this: host/path1/path2/path3/filename

And in this function I trying to separate the information between the ‘/’ and store it in my class variables host, path and filename (all of them are of type char*)

However this is not working, when compiling I get:

error C4996: 'strtok': This function or variable may be unsafe. Consider using strtok_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

error C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

I would like to understand why this functions are «unsafe» and any information about this is well received.

Should I do this another way, like trying to do this with strings?

Should I disable deprecation with _CRT_SECURE_NO_WARNINGS?

I am working in visual studio

Here is my function checkCommand:

bool Client::checkCommand(int argc_, char* arguments)
{
    if (argc_ == 2)
	{
		char* tokens[MAXTOKENS] = {  };			
		char* tokenPtr = strtok(arguments, "/");
		int i, totalTokens = 0;
		
                while (tokenPtr != NULL && totalTokens < MAXTOKENS)
		{
			tokens[totalTokens] = tokenPtr;
			tokenPtr = strtok(NULL, "/");
		}

		this->host = tokens[0];
		this->filename = tokens[totalTokens];
		this->path = tokens[2];

/*here i concatenate my first path to the rest of the paths*/
		for (i = 3; i < totalTokens; i++)
		{
			strcat(this->path, tokens[i]);
			strcat(this->path, "/");
		}
		return true;
	}
	else 
		return false;
}

thank you!