zpl 预览html,在将它发送到Zebra打印机之前，使用.NET WinForm打印预览ZPL II命令
我需要能够在我的应用程序中显示标签。所以我联系了Fiddler并弄清楚通信是什么来获得标签的图像。
我让它在LinqPad中运行。 HTTP的东西可以清理一下，但我想我会发布代码供其他人使用：
void Main()
{
string printerIpAddress = "10.92.0.167";
string zpl="^XA^CFD^CVY^PON^FWN^LS0^LT0^LH15,17^FS^FO0,2^FO14,3^FH^FDHi^FS^XZ";
// post the data to the printer
var imageName = PostZplAndReturnImageName(zpl, printerIpAddress);
// Get the image from the printer
var image = LoadImageFromPrinter(imageName, printerIpAddress);
Console.WriteLine(image);
}
public static string PostZplAndReturnImageName(string zpl, string printerIpAddress)
{
string response = null;
// Setup the post parameters.
string parameters = "data="+ zpl;
parameters = parameters + "&" + "dev=R";
parameters = parameters + "&" + "oname=UNKNOWN";
parameters = parameters + "&" + "otype=ZPL";
parameters = parameters + "&" + "prev=Preview Label";
parameters = parameters + "&" + "pw=";
// Post to the printer
response = HttpPost("http://"+ printerIpAddress +"/zpl", parameters);
// Parse the response to get the image name. This image name is stored for one retrieval only.
HtmlAgilityPack.HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(response);
var imageNameXPath = "/html[1]/body[1]/div[1]/img[1]/@alt[1]";
var imageAttributeValue = doc.DocumentNode.SelectSingleNode(imageNameXPath).GetAttributeValue("alt","");
// Take off the R: from the front and the .PNG from the back.
var imageName = imageAttributeValue.Substring(2);
imageName = imageName.Substring(0,imageName.Length - 4);
// Return the image name.
return imageName;
}
public static string HttpPost(string URI, string Parameters)
{
System.Net.WebRequest req = System.Net.WebRequest.Create(URI);
req.Proxy = new System.Net.WebProxy();
//Add these, as we're doing a POST
req.ContentType = "application/x-www-form-urlencoded";
req.Method = "POST";
//We need to count how many bytes we're sending.
//Post'ed Faked Forms should be name=value&
byte [] bytes = System.Text.Encoding.ASCII.GetBytes(Parameters);
req.ContentLength = bytes.Length;
System.IO.Stream os = req.GetRequestStream();
os.Write (bytes, 0, bytes.Length); //Push it out there
os.Close ();
System.Net.WebResponse resp = req.GetResponse();
if (resp== null) return null;
System.IO.StreamReader sr =
new System.IO.StreamReader(resp.GetResponseStream());
return sr.ReadToEnd().Trim();
}
public static Image LoadImageFromPrinter(string imageName, string printerIpAddress)
{
string url = "http://"+ printerIpAddress +"/png?prev=Y&dev=R&oname="+ imageName +"&otype=PNG";
var response = Http.Get(url);
using (var ms = new MemoryStream(response))
{
Image image = Image.FromStream(ms);
return image;
}
}
public static class Http
{
public static byte[] Get(string uri)
{
byte[] response = null;
using (WebClient client = new WebClient())
{
response = client.DownloadData(uri);
}
return response;
}
}这有以下参考文献：
HtmlAgilityPack
System.Drawing
System.Net以及以下用途：
HtmlAgilityPack
System.Drawing
System.Drawing.Imaging
System.Net注意：我找不到与串行/非IP地址打印机通信的方法。 (虽然这并不意味着没有办法。)