C++ 简单的打印日志代码片段

int print_log1(const wchar_t* text)
{
    if(0 == debug_log)
    {
        return 0;
    }
    std::string str = LPCTSTR2string(text);

    return print_log2(str);
}

int print_log2(const std::string text)
{

    if(0 == debug_log)
    {
        return 0;
    }
    int len = text.length() ;
    char* cstr = new char[128];
    int i;
    for( i=0;i<text.length();i++)
        cstr[i] = text[i];
    cstr[i] = '\0';
    char end[2] = {'\r','\0'};
    //首先判断文件是否存在，如果不存在则创建，并在开头加入0xfeff;如果存在则直接写入
    FILE* fp;
    fopen_s(&fp, logFilePath2, "at");
    if (fp != NULL)
    {

        SYSTEMTIME st;
        GetLocalTime(&st);
        char buf[128] = { 0 };
        sprintf_s(buf, 128, "%04d%02d%02d %02d:%02d:%02d:%03d    ", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
        fwrite(buf, strlen(buf), 1, fp);
        //fwrite(text, sizeof(wchar_t), wcslen(text), fp);
        //fwrite(text, strlen(text), 1, fp);
        fwrite(cstr, i+1, 1, fp);

        fwrite(end, strlen(end), 1, fp);
        //fflush(fp);
        fclose(fp);

    }
    delete[]cstr; 
    cstr=NULL;
    return 1;
}