通过HTTP POST下载的文件，我要去哪里错了？ [英] Downloading a file via an HTTP Post, where am I going wrong?

问题描述

我试图通过使用的此页面作为参考，我想不通我要去的地方错了。

I am trying to download a report from Datacash via an HTTP post using this page as a reference and I can't figure out where I am going wrong.

我的。方法如下：

private static void DownloadDatacashData(int howManyDays)
{
    string post, url, group, user, password, startDate, endDate, type, csvFile;

    url = "https://reporting.datacash.com/reporting2/csvlist?";

    group = "123456";
    user = "autoreport";
    password = "foobar";
    startDate = DateTime.Now.AddDays(howManyDays).ToString("yyyy-MM-dd");
    endDate = DateTime.Now.ToString("yyyy-MM-dd");
    type = "stl";

    post = String.Format(@"group={0}&user={1}&password={2}&start_date={3}&end_date={4}&type={5}", group, user, password, startDate, endDate, type);

    var request = (HttpWebRequest)WebRequest.Create(url);
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version11;
    request.Method = "POST";
    request.ContentLength = 0;

    var postBytes = Encoding.ASCII.GetBytes(post);

    request.ContentType = "application/x-www-form-urlencoded";
    request.ContentLength = postBytes.Length;
    var requestStream = request.GetRequestStream();

    requestStream.Write(postBytes, 0, postBytes.Length);
    requestStream.Close();

    var response = (HttpWebResponse)request.GetResponse();

    var sr = new StreamReader(response.GetResponseStream());
    csvFile = sr.ReadToEnd();
    sr.Close();

    var sw = new StreamWriter("C:\\foo\\bar.csv", false);
    sw.Write(csvFile);
    sw.Flush();
    sw.Close();
}

首先，执行岗位。但是，我总是得到一个文件回来文本错误：未找到报表类型。如果我更改URL，我得到一个错误，所以这个URL绝对是响应HTTP职位。我曾试图与和没有？在初始的URL，和有和没有？在后字符串的开始。

First of all, the post is performed. But I always get a file back with the text "Error: Report type not found". If I change the URL, I get an error so this URL is definitely responding to HTTP post. I have tried this with and without the ? in the initial URL, and with and without the ? at the start of the post string.

我已经尝试与Datacash的技术支持取得联系，他们不能帮助我。我给他们送去我使用的代码和所有我回来是，有没有什么错在他们的结局。

I have already tried to get in touch with Datacash's technical support and they couldn't help me. I sent them the code I am using and all I got back was that there wasn't anything wrong on their end.

的凭据是正确的，密码是一个组合字母和数字（无特殊字符）。

The credentials are correct, the password is a combination of letters and numbers (no special characters).

我知道这不是你们中许多人将已经使用datacash但是看着我的代码和信息的这里，有什么明显错误？与我在做什么？我兜兜转转。

I know that not many of you will have used datacash but looking at my code and the information here, is there anything obviously wrong with what I am doing? I am going around in circles.

三江源

推荐答案

您的代码似乎太复杂了这样的事情。尽量简化：

Your code seems way too complicated for something like this. Try simplifying:

private static void DownloadDatacashData(int howManyDays)
{
    var url = "https://reporting.datacash.com/reporting2/csvlist";
    using (var client = new WebClient())
    {
        var values = new NameValueCollection
        {
            { "group", "123456" },
            { "user", "autoreport" },
            { "password", "foobar" },
            { "start_date", DateTime.Now.AddDays(howManyDays).ToString("yyyy-MM-dd") },
            { "end_date", DateTime.Now.ToString("yyyy-MM-dd") },
            { "type", "stl" },
        };
        byte[] result = client.UploadValues(url, values);
        File.WriteAllBytes("C:\\foo\\bar.csv", result);
    }
}

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