CStringW buff;
while (file->ReadString(buff)) {
    buff.Trim();
    if (buff.IsEmpty()) {
        continue;
    }
	double a;
    WCHAR sep;
    int num = 0; // This one isn't really used just assigned a new value
    int hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2;
    WCHAR msStr1[5] = {0}, msStr2[5] = {0};
    int c = swscanf_s(buff, L"%d%c%d%c%d%4[^-] --> %d%c%d%c%d%4s\n",
                      &hh1, &sep, sizeof(WCHAR), &mm1, &sep, sizeof(WCHAR),
                      &ss1, msStr1, _countof(msStr1),
                      &hh2, &sep, sizeof(WCHAR), &mm2, &sep, sizeof(WCHAR),
                      &ss2, msStr2, _countof(msStr2));
 
    ...
}

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