今日报错系列：‘fopen‘: This function or variable may be unsafe. Consider using fopen_s instead.

VS2017, when I use FILE to write, I encounter the following error

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

After a search attempt, adding _CRT_SECURE_NO_WARNIN and so on in the steps [Open Project >> Properties >> C/C++ >> Preprocessor >> Preprocessor Definition] has no effect.

It was finally solved like this:

Add at the front of the program: #define _CRT_SECURE_NO_DEPRECATE to solve the problem.

#define _CRT_SECURE_NO_DEPRECATE 

Give a chestnut:

#define _CRT_SECURE_NO_DEPRECATE //加到此处解决问题
#include <iostream>
using namespace std;

void main()
{
    
    
	FILE *fp = fopen("myFileFp.txt","w");
	char str[] = "hello world !";
	for (int i = 0; i < 1000; i++)
	{
    
    
		fprintf(fp," 第 %d 个 %s ;\n",i,str);
	}
	fclose(fp);
}

After the file is opened: from 0-999 hello world!;

Put the information you found here for reference:

The most complete solution to solve the fopen and fscanf requirements in VS to be replaced with fopen_s and fscanf_s -------------- ps: If you encounter the above problems when using MFC, you can use the third method to solve the first method : Add #define _CRT_SECURE_NO_DEPRECATE at the top of the program;

Method 2: Add #define _CRT_SECURE_NO_WARNINGS at the top of the program;

Method 3: Add #pragma warning(disable:4996) at the top of the program;

Method 4: Change scanf, scanf to scanf_s, fopen_s, please Baidu for specific method;

Method 5: There is no need to add that line of code at the top of the program, just uncheck "SDL check" when creating a new project;

Method 6: If the project has been established, you can also close SDL in the project properties;

Method 7: Just set it in the project; put the macro definition that reported the error in the project properties-C/C+±- preprocessor-preprocessor definition;

Method 8: In the project properties-c/c++-command line, add: /D _CRT_SECURE_NO_WARNINGS.

End:

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