C# 如何从HTTP流组装pdf？
我正在使用第三方html到pdf转换（DocRaptor）。你把你的HTML发布到他们的网站上，他们用PDF回复。他们提供给您的启动程序代码工作正常，但它会将文件放入硬盘。我修改了他们的代码，让它通过浏览器下载文件。因此，我100%相信从HTTP响应中获得的数据是好数据。我似乎无法将它重新组合成一个可用的文件 我有理由相信问题在于我如何处理responseStream数据。一旦我进入试一试阶段，一切似乎都出了问题。我对c#和web编程非常陌生，因此我非常感谢这里的so用户提供一些指导。谢谢这是我的密码C# 如何从HTTP流组装pdf？,c#,asp.net,http,pdf-generation,C#,Asp.net,Http,Pdf Generation,我正在使用第三方html到pdf转换（DocRaptor）。你把你的HTML发布到他们的网站上，他们用PDF回复。他们提供给您的启动程序代码工作正常，但它会将文件放入硬盘。我修改了他们的代码，让它通过浏览器下载文件。因此，我100%相信从HTTP响应中获得的数据是好数据。我似乎无法将它重新组合成一个可用的文件 我有理由相信问题在于我如何处理responseStream数据。一旦我进入试一试阶段，一切似乎都出了问题。我对c#和web编程非常陌生，因此我非常感谢这里的so用户提供一些指导。谢谢这是我
string postData = String.Format(PostFormat,
(string.IsNullOrEmpty(DocumentContent) ? "document_url" : "document_content"),
HttpUtility.UrlEncode(string.IsNullOrEmpty(DocumentContent) ? DocumentURL : DocumentContent),
HttpUtility.UrlEncode(Name),
HttpUtility.UrlEncode(type),
HttpUtility.UrlEncode(Test.ToString().ToLower()),
HttpUtility.UrlEncode(Strict),
HttpUtility.UrlEncode(PrinceOptions));
var byteArray = Encoding.UTF8.GetBytes(postData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(DocRaptorUrl);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
using (var dataStream = request.GetRequestStream()) { dataStream.Write(byteArray, 0, byteArray.Length); }
System.IO.Stream stream = null;
try
{
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
var filepath = @"C:\Users\David\Downloads\UberwriterUSRReport.pdf";
HttpContext.Current.Response.ContentType = "application/pdf";
// let the browser know how to open the PDF document, attachment or inline, and the file name
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=UberwriterUSRReport.pdf"));
stream = new System.IO.FileStream(filepath, System.IO.FileMode.Create);
CopyStream(responseStream, stream);
long bytestToRead = stream.Length;
while (bytestToRead > 0)
{
if (HttpContext.Current.Response.IsClientConnected)
{
byte[] buffer = new Byte[10000];
int length = stream.Read(buffer, 0, 10000);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
HttpContext.Current.Response.Flush();
bytestToRead = bytestToRead - length;
}
else
{
bytestToRead = -1;
}
}
}
}
}
您是否打算在将文件发送到浏览器之前将其保存到硬盘？因为这就是你现在（错误地）所做的 最好是将write操作包含在using语句中，因为我看不到您在任何地方关闭流：
stream = new System.IO.FileStream(filepath, System.IO.FileMode.Create);
CopyStream(responseStream, stream);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
var filepath = @"C:\Users\David\Downloads\UberwriterUSRReport.pdf";
HttpContext.Current.Response.ContentType = "application/pdf";
// let the browser know how to open the PDF document, attachment or inline, and the file name
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=UberwriterUSRReport.pdf"));
using (var stream = new System.IO.FileStream(filepath, System.IO.FileMode.Create)) {
CopyStream(responseStream, stream);
}
using (var readstream = new System.IO.FileStream(filepath, System.IO.FileMode.Read)) {
CopyStream(readstream, HttpContext.Current.Response.OutputStream);
}
}
}
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
// let the browser know how to open the PDF document, attachment or inline, and the file name
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=UberwriterUSRReport.pdf"));
CopyStream(responseStream, HttpContext.Current.Response.OutputStream);
}
}
您是否打算在将文件发送到浏览器之前将其保存到硬盘？因为这就是你现在（错误地）所做的 最好是将write操作包含在using语句中，因为我看不到您在任何地方关闭流：
stream = new System.IO.FileStream(filepath, System.IO.FileMode.Create);
CopyStream(responseStream, stream);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
var filepath = @"C:\Users\David\Downloads\UberwriterUSRReport.pdf";
HttpContext.Current.Response.ContentType = "application/pdf";
// let the browser know how to open the PDF document, attachment or inline, and the file name
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=UberwriterUSRReport.pdf"));
using (var stream = new System.IO.FileStream(filepath, System.IO.FileMode.Create)) {
CopyStream(responseStream, stream);
}
using (var readstream = new System.IO.FileStream(filepath, System.IO.FileMode.Read)) {
CopyStream(readstream, HttpContext.Current.Response.OutputStream);
}
}
}
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
// let the browser know how to open the PDF document, attachment or inline, and the file name
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=UberwriterUSRReport.pdf"));
CopyStream(responseStream, HttpContext.Current.Response.OutputStream);
}
}
非常感谢斯蒂芬让我走上了正确的道路。我进一步完善了实施。我有更多需要的代码。我只希望用户点击一个按钮，将HTML发布到DocRaptor.com网站，让他们用生成的PDF进行响应，并将该文件作为下载显示在浏览器中。下面是在Azure上测试的最终实现代码
try
{
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
//var filepath = @"C:\Users\David\Downloads\UberwriterUSRReport.pdf";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ContentType = "application/pdf";
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("atachment; filename=UberwriterUSRReport.pdf"));
HttpContext.Current.Response.BufferOutput = true;
CopyStream(responseStream, HttpContext.Current.Response.OutputStream);
}
}
}
非常感谢斯蒂芬让我走上了正确的道路。我进一步完善了实施。我有更多需要的代码。我只希望用户点击一个按钮，将HTML发布到DocRaptor.com网站，让他们用生成的PDF进行响应，并将该文件作为下载显示在浏览器中。下面是在Azure上测试的最终实现代码
try
{
using (HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse())
{
using (System.IO.Stream responseStream = httpResponse.GetResponseStream())
{
//var filepath = @"C:\Users\David\Downloads\UberwriterUSRReport.pdf";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ContentType = "application/pdf";
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("atachment; filename=UberwriterUSRReport.pdf"));
HttpContext.Current.Response.BufferOutput = true;
CopyStream(responseStream, HttpContext.Current.Response.OutputStream);
}
}
}
谢谢你的想法，它成功了。我承认我不知道为什么。我必须在你的建议中修改一件事才能使它生效。我没有使用FileMode.Read，而是使用FileMode.Open。当我为你的解决方案编写代码时，“阅读”不是我的选择。很高兴看到它起作用了。我必须承认我是用心做的，所以我并不奇怪会出现这样的错误：）它在本地对我有效，但我只是将它发布到Azure和一个网站上。我认为文件路径是个问题。我是否可以接收responseStream并将其直接发送到浏览器，就好像它是下载的文件一样？这就是我真正想要的。我只想让用户点击按钮，生成一个PDF文件，并在客户端显示为下载。是的，第二个代码段应该可以做到这一点。谢谢你的创意，它成功了。我承认我不知道为什么。我必须在你的建议中修改一件事才能使它生效。我没有使用FileMode.Read，而是使用FileMode.Open。当我为你的解决方案编写代码时，“阅读”不是我的选择。很高兴看到它起作用了。我必须承认我是用心做的，所以我并不奇怪会出现这样的错误：）它在本地对我有效，但我只是将它发布到Azure和一个网站上。我认为文件路径是个问题。我是否可以接收responseStream并将其直接发送到浏览器，就好像它是下载的文件一样？这就是我真正想要的。我只想让用户点击按钮，生成一个PDF，然后在客户端显示为下载