// 保存采集信息
private void save_info(object sender, EventArgs e)
{
string[] content = { textBox1.Text, textBox2.Text, textBox3.Text, textBox4.Text };
write2csv writer = new write2csv();
writer.start(info_csv, content, title);
string Message_str = String.Format("刚才输入的xpath信息已保存至\"{0}\"", info_csv);
log.LogMessage(display_box, Message_str);
}
/// <summary>
/// 爬取一条数据,先调用"价格采集.exe",无效时,调用phantomjs_crawl.start
/// 前者速度快,后者通用性强
/// </summary>
/// <param name="goods_name">商品名</param>
/// <param name="goods_unit">单位</param>
/// <param name="goods_url">链接</param>
/// <param name="price_xpath">价格的xpath</param>
public void one_crawl(string goods_name, string goods_unit, string goods_url, string price_xpath)
{
// 调用
string[] args = { goods_name, goods_unit, goods_url, price_xpath };
string status_code = StartProcess(exe_path, args); // 调用外部的exe
// 判断错误原因
string status_info = "";
if ((status_code == "0") || (status_code == "1"))
{
if (status_code == "0")
{
status_info = "成功获取数据";
}
else
{
status_info = "'采集数据.exe'获取数据失败,该数据位于渲染后的网页上";
}
}
else
{
status_info = "网址链接打开失败,返回码:" + status_code;
}
string price_csv = "./商品价格/" + goods_name + ".csv";
// python没有获取到数据时
if (status_code != "0")
{
log.LogNormal(display_box, status_info);
log.LogNormal(display_box, "开始使用C#的phantomjs爬虫");
phantomjs_crawl crawl = new phantomjs_crawl();
string price = crawl.xpath_crwal(goods_url, price_xpath); // 网址,xpath
if (price == "NULL")
{
log.LogError(display_box, "C#的phantomjs爬虫也未成功得到" + goods_name + "的数据");
return; // phantomjs.exe也失败了,就退出当前函数
}
string[] price_title = { "日期", "价格", "单位" };
///判断是否有最新价格
bool is_exist_newest = false; // 初始化,"最新价格不存在"
if (File.Exists(price_csv)) // 存在该文件时
{
//获取已有最新价格
string[] lines = File.ReadAllLines(price_csv);
string[] data0 = lines[lines.Length - 1].Split('\"'); // 拆分
List <string> data_1 = new List <string>(data0);
string[] data = data_1.Where(p => (p != ",") & (p != " ") & (p != "")).ToArray(); // 去除数组中的逗号,空格,空值
if (price == data[1])
{
is_exist_newest = true;
}
}
if (price != "")
{
log.LogNormal(display_box, "成功获取渲染后的网页数据,价格为:");
if (is_exist_newest == false)
{
DateTime dt = DateTime.Now;
string date_str = String.Format("{0:d}", dt);
string[] content = { date_str, price, goods_unit }; // 日期,价格,单位
write2csv writer = new write2csv();
writer.start("./商品价格/" + goods_name + ".csv", content, price_title);
log.LogMessage(display_box, "今日价格为:" + price + ",已保存到'商品价格'文件夹");
}
else
{
log.LogMessage(display_box, "最新价格已存在,无需重复写入.今日价格为:" + price + goods_unit);
}
}
else
{
log.LogError(display_box, "获取失败");
}
}
}