4

我需要在 PDF 报告中包含一个 highcharts 图表。但是如何获得 export.highcharts.com 生成的图像/png?这就是我到目前为止所做的:

单击按钮时,将触发此 ajax 请求:

$.ajax({
   url: "Home/Teste",
   type: "POST",
   dataType: "html",
   data: { svgParam: myChart.getSVG() },
   success: function (data) {
       doStuff(data);
}});

在服务器上,我收到请求并按如下方式处理:

[HttpPost]
[ValidateInput(false)]
public void Teste(string svgParam)
{
    // Create a request using a URL that can receive a post. 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://export.highcharts.com/");
    // Set the Method property of the request to POST.
    request.Method = "POST";

    // Create POST data and convert it to a byte array.
    string postData = string.Format("filename={0}&type={1}&width={2}&sgv={3}", "chart", "image/png", 1270, Server.UrlEncode(svgParam));

    byte[] byteArray = Encoding.UTF8.GetBytes(postData);

    // Set the ContentType property of the WebRequest.
    request.ContentType = "application/x-www-form-urlencoded; multipart/form-data";

    //User agent is based in a normal export.js request
    request.UserAgent = @"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0";

    // Set the ContentLength property of the WebRequest.
    request.ContentLength = byteArray.Length;
    // Get the request stream.
    Stream dataStream = request.GetRequestStream();
    // Write the data to the request stream.
    dataStream.Write(byteArray, 0, byteArray.Length);
    // Close the Stream object.
    dataStream.Close();
    // Get the response.
    WebResponse response = request.GetResponse();

    HttpWebResponse webResponse = (HttpWebResponse)request.GetResponse();
    //This is here just to read the response.
    string msg;
    using (StreamReader sReader = new StreamReader(webResponse.GetResponseStream()))
    {
        msg = sReader.ReadToEnd();
    }
}

svgParam 是一个 html 字符串,内容如下:"

我在 asp.net 中得到这个 svgParam 没有问题。但是 export.highcharts.com 的响应总是一样的,就好像 te svg 没有发送一样:

<body>
    <div id="top">
        <a href="http://www.highcharts.com" title="Highcharts Home Page"
            id="logo"><img alt="Highcharts Home Page"
            src="resources/Highcharts-icon-160px.png" border="0"></a>
        <h1>Highcharts Export Server</h1>
    </div>
    <div id="wrap">
        <h3>Oops..,</h3>
        <p>The manadatory svg POST parameter is undefined.</p>
    </div>
</body>

为了测试,我在我的应用程序中创建了另一个方法来接收这个 WebRequest,如下所示:

[HttpPost]
[ValidateInput(false)]
public void Teste2(string filename, string type, string width, string svg)
{
    string whereIsMySvg = svg;
}

接收文件名、类型和宽度参数。但是 svg 是空的。我尝试编码,不编码,序列化为 json 字符串,更改内容类型......什么都没有,svg 参数永远不会到达目的地。

有任何想法吗?

4

1 回答 1

7

如果您复制并粘贴了代码,并且这不是印刷错误,则您在发送到导出服务器的请求参数中拼错了“svg”。你有“sgv”。

于 2013-03-26T05:15:52.357 回答