Programmatically Attach File to InfoPath

Hi Devs,
If you want to Programmaticall add attachment to your infopath file. Use the Following Function :


private void btnSelect_Click(object sender, EventArgs e)
{
dlgOpen.ShowDialog();
txtFile.Text = dlgOpen.FileName;
string[] str = txtFile.Text.Split('\\');
fileName = str[str.GetUpperBound(0)].ToString();
}
private void btnAttach_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream(txtFile.Text, FileMode.Open);
byte[] fileBuffer = new byte[fs.Length];
fs.Read(fileBuffer, 0, (int)fs.Length);
fs.Close();
// To Fetch the Node
string xmlFilePath = @"E:\Infopath\Form\template.xml";
XMLManager.XMLSearchHelper xmlSrch = new XMLManager.XMLSearchHelper();
xmlSrch.XMLFile = xmlFilePath;
XmlNode n1 = xmlSrch.GetValue("/my:myFields");
XmlDocument myDoc = new XmlDocument();
XmlDocument doc = new XmlDocument();
myDoc.Load(xmlFilePath);
doc.Load(xmlFilePath);
XmlElement attachmentElement = myDoc.CreateElement("FileAttachment");
//Import the last book node from doc2 into the original document.
XmlNode newattach = doc.ImportNode(myDoc.DocumentElement.LastChild,true);
int namebufferlen = fileName.Length * 2;
byte[] namebuffer = new byte[namebufferlen];
byte[] filecontent = new byte[fileBuffer.Length + 24 + namebufferlen];
byte[] filesize = BitConverter.GetBytes((uint)fileBuffer.Length);
byte[] filenamelength = BitConverter.GetBytes((uint)namebufferlen / 2);
filecontent[0] = 199;
filecontent[1] = 73;
filecontent[2] = 70;
filecontent[3] = 65;
filecontent[4] = 20;
filecontent[5] = 0;
filecontent[6] = 0;
filecontent[7] = 0;
filecontent[8] = 1;
filecontent[9] = 0;
filecontent[10] = 0;
filecontent[11] = 0;
filecontent[12] = 0;
filecontent[13] = 0;
filecontent[14] = 0;
filecontent[15] = 0;
filecontent[16] = filesize[0];
filecontent[17] = filesize[1];
filecontent[18] = filesize[2];
filecontent[19] = filesize[3];
filecontent[20] = filenamelength[0];
filecontent[21] = filenamelength[1];
filecontent[22] = filenamelength[2];
filecontent[23] = filenamelength[3];
UnicodeEncoding.Unicode.GetBytes(fileName + "\0", 0, fileName.Length + 1, filecontent, 24);
for (int i = 0; i < fileBuffer.Length; i++)
{
filecontent[24 + namebufferlen + i] = fileBuffer[i];
}
string s = Convert.ToBase64String(filecontent);
attachmentElement.InnerText = s;
myDoc.DocumentElement.SelectSingleNode("my:myFields/my:Req",XMLManager.XMLSearchHelper.nameSpcMgr).AppendChild(attachmentElement);
//n1.AppendChild(attachmentElement);
myDoc.Save(@"C:\Output.xml");
}
}