Comparison of C/C++ open file functions fopen and fopen_s usage
Language: C/C++
Test environment: VS2015
Since the high version of VS has higher requirements for the security of file operations, the following will occur:
1, the use of fopen:
2, the use of fopen_s:
Discussion and comparison
1. The security of fopen_s is that the closed function fopen has more overflow detection;
2. In use, the return value of the function fopen is the file pointer. If the returned file pointer is NULL, it means that opening the file fails. The return value of the function fopen_s is the corresponding error code, which helps to troubleshoot the problem by looking at the meaning of the error code.
3. The files opened by fopen_s cannot be shared. If the files you open need to be shared, you cannot use the fopen_s function. Consider the two functions _fopen, _wfsopen.
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