Question

How to compare two file times in C Win32 API

Answer 1

#include <windows.h>
#include <stdio.h>

// LONG CompareFileTime(const FILETIME* lpFileTime1, const FILETIME* lpFileTime2);

/*
typedef struct _FILETIME {
  DWORD dwLowDateTime;
  DWORD dwHighDateTime;
} FILETIME, *PFILETIME, *LPFILETIME;

// Contains a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC).

*/

int main() {
    FILETIME fileTime1, fileTime2;

    // Example: Initialize FILETIME structures with arbitrary values
    fileTime1.dwLowDateTime = 200000000;
    fileTime1.dwHighDateTime = 0;

    fileTime2.dwLowDateTime = 100000000;
    fileTime2.dwHighDateTime = 0;

    // Compare the two FILETIME structures
    LONG result = CompareFileTime(&fileTime1, &fileTime2);

    if (result < 0) {
        printf("fileTime1 < fileTime2.\n");
    }
    else if (result == 0) {
        printf("fileTime1 == fileTime2.\n");
    }
    else {
        printf("fileTime1 > fileTime2.\n");
    }

    return 0;
}



/*
run

fileTime1 > fileTime2.

*/

 

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