Question

我只是想按照一定的顺序写一个数月的数月。

  std::fstream fin(file, std::ios::in | std::ios::binary | std::ios::ate);
    if (fin.good())
    {
        fin.seekg(0, fin.end);
        int size_stream = (unsigned int)fin.tellg(); fin.seekg(0, fin.beg);
        int pos = (unsigned int)fin.tellg();
        //........................<sending the file in blocks  
        while (true)
        {
            if (size_stream > 64000)
            {
                fin.read(buf, 63999);
                buf[64000] = '\0';
                CString strText(buf);
                SendFileContent(userKey,
                    (LPCTSTR)strText);
                size_stream = size_stream - 63999;
                pos = pos + 63999;
                fin.seekg(pos, std::ios::beg);
            }
            else
            {
                fin.read(buf, size_stream);
                buf[size_stream] = '\0';
                CString strText(buf);
                SendFileContent(userKey,
                    (LPCTSTR)strText); break;
            }
        }

然后像这样写入数组：

                                string January = "January";
                                string February = "February";
                                string March = "March";
                                string April = "April";
                                string May = "May";
                                string June = "June";
                                string July = "July";
                                string August = "August";
                                string September = "September";
                                string October = "October";
                                string November = "November";
                                string December = "December";

sortedmonths在另一个cs表中初始化。已排序的月份数组的大小为1022，因为这是读入的月数。

为什么这不起作用？我用Google搜索了空引用异常，但没有发现任何与写入数组有关的内容。

Answer 1

analyzer.sortedmonths为空。你必须初始化它：

analyzer.sortedmonths = new string[12];

写入数组时出现空引用异常。 C＃

1 个答案: