sscanf_s: format string '%d' requires an argument of type 'int ', but variadic argument 4 has type 'WORD '

Question

SYSTEMTIME ConvertStringToSystemTime(const char *dateTimeString) const 
{

    SYSTEMTIME systime;
    memset(&systime, 0, sizeof(systime));
    // Date string should be "dd-MM-yyyy hh:mm:ss:mss"
    auto u = sscanf_s(dateTimeString, "%d/%d/%d%d:%d:%d:%d:%d",
        &systime.wDay,
        &systime.wMonth,
        &systime.wYear,
        &systime.wHour,
        &systime.wMinute,
        &systime.wSecond,
        &systime.wMilliseconds);
    return systime;
}

My whole problem being is that I'm reading a date from a file, which is stored in a string variable, and I need to subtract the current Systemtime to the one read from the file.

And I was trying to sort it out by converting the string to Systemtime, and then get the difference, but after trying out this function, I keep getting that warning error which I must fix but don't know how exactly.

Yeah, there's an extra one at the end, thank you for pointing that out! — Riad, Mar 18 '19 at 13:18

score 0 · Answer 1 · answered Mar 18 '19 at 11:21

0

In windows, WORD is defined as unsigned short, so it needs %u instead of %d.

answered Mar 18 '19 at 11:21

Liu Yubo

116
3

%u reads an `unsigned int`, not short. https://stackoverflow.com/a/35296206/4955498 – Michael Veksler Mar 18 '19 at 11:43

score 0 · Accepted Answer · answered Mar 18 '19 at 11:54

0

Use %hu instead of %d.

Explanation: The fields of SYSTEMTIME fields are of type WORD, which is defined as

typedef unsigned short WORD;

Reading type unsigned short requires %hu as described here.

answered Mar 18 '19 at 11:54

Michael Veksler

8,217
1
20
33

sscanf_s: format string '%d' requires an argument of type 'int *', but variadic argument 4 has type 'WORD *'

2 Answers2

sscanf_s: format string '%d' requires an argument of type 'int ', but variadic argument 4 has type 'WORD '