winapi - non-sense file timestamps?

Question

I can't seem to get a reliable timestamp using winapi functions. For example:

int main(int argc, char *argv[])
{
HANDLE file;
BY_HANDLE_FILE_INFORMATION finfo;
SYSTEMTIME systime;

file = CreateFile("test.txt",GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
GetFileInformationByHandle(file,&finfo);
FileTimeToSystemTime(&finfo.ftLastWriteTime, &systime);
printf("  %s   %02d:%02d:%02d %d/%d/%d\n", "test.txt",  systime.wHour,systime.wMinute,systime.wSecond,systime.wDay,systime.wMonth,systime.wYear);
}

gives non-sense on all my files like:

test.txt   00:03:30 33/5/3

wDay seems to have values outside of range 1-31 and the times and dates are totally wrong. All other values in the BY_HANDLE_FILE_INFORMATION like name and size are correct, and in I full code I check for errors from all functions, but they all return passed. Anyone know what I am doing wrong?

Greg Hewgill Greg Hewgill · Accepted Answer · 2009-04-30T00:21:46

I think the problem is your use of filesize.QuadPart. Try removing that from both the format string and the argument list, and see if it works.

If that helps, then look up the correct format string to use for a 64-bit quantity in printf().

winapi - non-sense file timestamps?

1 Answers