我正在使用以下 C# 代码通过 Box view API 上传、转换和下载 .pptx 文件。
var boxViewID = "";
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
String url_ = @"https://upload.view-api.box.com/1/documents";
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url_);
wr.ContentType = "multipart/form-data; boundary=" + boundary;
wr.Headers.Add("Authorization:Token " + "MY_CODE"/*Configuration.BoxViewAPIKey*/);
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
wr.Timeout = 1000000;
wr.SendChunked = true;
DateTime start = DateTime.Now;
Exception exc = null;
Stream rs = wr.GetRequestStream();
try
{
rs.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; non_svg=\"true\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
string header = string.Format(headerTemplate,"file", file, contentType);
Console.WriteLine(header);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
rs.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[40960];
int bytesRead = 0;
int totalSent = 0;
int totalLength = (int)fileStream.Length;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
totalSent += bytesRead;
var percent = new decimal(100.0 * totalSent / totalLength);
if (progress != null)
{
progress("Box processing", percent);
}
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
}
catch(Exception ex)
{
exc = ex;
}
DateTime end = DateTime.Now;
int seconds = (int)(end - start).TotalSeconds;
if(seconds>=0)
{
if(exc!=null)
{
throw exc;
}
}
byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
rs.Write(trailer, 0, trailer.Length);
rs.Close();
WebResponse wresp = null;
try
{
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
var res = reader2.ReadToEnd();
var docRes = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, string>>(res);
if (docRes["id"] != null)
boxViewID = docRes["id"];
}
catch (Exception ex)
{
if (wresp != null)
{
wresp.Close();
wresp = null;
}
}
finally
{
wr = null;
}
return boxViewID;
指定“non_svg”参数应该为演示文稿中的每张幻灯片创建 .png 图像（而不是 .svg + .html 对）。但是，API 似乎忽略了这部分请求，我总是得到 svg 文件。知道我在做什么错吗？谢谢！
