How can we find that the given "file path" is valid or not, using C program?

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Can any one help me? I want to know how really that code works.

What I have tried:

char filename[MAX_PATH] = "D:\\example\\test.txt";
FILE *fp;
fp = fopen_s(&fp, filename, "r");

// want to check the given path is correct or not with out exceptions. for eg: filename[] = "A:\\file\\test.txt" which is a invalid path, how to know that?

Posted 4-Jun-18 18:12pm

Member 13858712

Updated 4-Jun-18 19:33pm

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KarstenK 5-Jun-18 2:21am

Why havent you read the documentation?

Richard MacCutchan 5-Jun-18 3:07am

lol

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OriginalGriff · Answer 1 · 2018-06-04T19:35:00

Look at the documentation: fopen_s, _wfopen_s[^]

Quote:
Return Value
Zero if successful; an error code on failure. See errno, _doserrno, _sys_errlist, and _sys_nerr for more information about these error codes.

The error code tells you why it failed: errno, _doserrno, _sys_errlist, and _sys_nerr[^]