Check a base quickbooks COM connection via a simple C# program 27.02.20

/*
 Example: 
 <?xml version="1.0"?><?qbxml version="2.0"?><QBXML><QBXMLMsgsRq onError="stopOnError"><CustomerAddRq requestID="1"><CustomerAdd><Name>fooo2</Name><Phone>6666666666666</Phone></CustomerAdd></CustomerAddRq></QBXMLMsgsRq></QBXML>
 
*/
using System;
using System.Xml;
using Interop.QBXMLRP2;
namespace customer
{
  class MainClass
  {
    public static String Build_xml(String name, String phone)
    {
      XmlDocument doc = new XmlDocument();
      doc.AppendChild(doc.CreateXmlDeclaration("1.0",null, null));
      doc.AppendChild(doc.CreateProcessingInstruction("qbxml", "version=\"2.0\""));

XmlElement qbXML = doc.CreateElement("QBXML");
      doc.AppendChild(qbXML);

XmlElement qbXMLMsgsRq = doc.CreateElement("QBXMLMsgsRq");
      qbXML.AppendChild(qbXMLMsgsRq);
      qbXMLMsgsRq.SetAttribute("onError", "stopOnError");
      
      XmlElement custAddRq = doc.CreateElement("CustomerAddRq");
      qbXMLMsgsRq.AppendChild(custAddRq);
      custAddRq.SetAttribute("requestID", "1");
      
      XmlElement custAdd = doc.CreateElement("CustomerAdd");
      custAddRq.AppendChild(custAdd);

custAdd.AppendChild(doc.CreateElement("Name")).InnerText=name;
      custAdd.AppendChild(doc.CreateElement("Phone")).InnerText=phone;
      String xml_str = doc.OuterXml;

return xml_str;
    }
    
    public static String Send_xml(String xml_str)
    {
      RequestProcessor2 rp = null;
      string ticket = null;
      string response = null;
      
      try
      {
        rp = new RequestProcessor2();
        rp.OpenConnection("", "client_customer" );
        ticket = rp.BeginSession("", QBFileMode.qbFileOpenDoNotCare );
        response = rp.ProcessRequest(ticket, xml_str);

}
      
      catch( System.Runtime.InteropServices.COMException ex )
      {
       return "COM Error Description = " +ex.Message + "COM error" ;  
      }
      
      finally
      {
        if( ticket != null )
        {
          rp.EndSession(ticket);
        }
        if( rp != null )
        {
          rp.CloseConnection();
        }
      }

return response;
    }
    
    
    
    public static String Parse_xml(String response)
    {
      String message = "";  
      XmlDocument doc = new XmlDocument();
      doc.LoadXml(response);
      XmlNodeList node_list = doc.GetElementsByTagName("CustomerAddRs");
      if(node_list.Count == 1) //it's always true, since we added a single Customer 
      {
        System.Text.StringBuilder msg = new System.Text.StringBuilder();
        XmlAttributeCollection rs_attr = node_list.Item(0).Attributes;
        //get the status Code, info and Severity
        string status_code = rs_attr.GetNamedItem("statusCode").Value;
        string status_serverity = rs_attr.GetNamedItem("statusSeverity").Value;
        string status_msg = rs_attr.GetNamedItem("statusMessage").Value;
        msg.AppendFormat( "statusCode = {0}, statusSeverity = {1}, statusMessage = {2}",status_code, status_serverity, status_msg );

//get the CustomerRet node for detailed info

//a CustomerAddRs contains max one childNode for "CustomerRet"
        XmlNodeList node_list2 = node_list.Item(0).ChildNodes;
        if( node_list2.Count == 1 && node_list2.Item(0).Name.Equals("CustomerRet") )
        {
          XmlNodeList node_list3 = node_list2.Item(0).ChildNodes ;

foreach( XmlNode i in node_list3 )
          {
            if( i.Name.Equals( "ListID" ) )
            {
              msg.AppendFormat("\r\nCustomer ListID = {0}", i.InnerText);
            }
            else if ( i.Name.Equals( "Name" ) )
            {
              msg.AppendFormat("\r\nCustomer Name = {0}", i.InnerText );
            }
            else if( i.Name.Equals( "FullName" ) )
            {
              msg.AppendFormat("\r\nCustomer FullName = {0}", i.InnerText );
            }
          }
        } // End of customerRet

message = msg.ToString();
        } //End of customerAddRs

return message;
    }
    
    
    public static void Main(string[] args)
    {

String xml_str = Build_xml("Foo","666666666");
      String response = Send_xml(xml_str);
      String message = Parse_xml(response);
     
     
      Console.WriteLine("Send Message: \n");
      Console.WriteLine(xml_str + "\n");

Console.WriteLine("Receive Message: \n");
      Console.WriteLine(response);
      
      Console.WriteLine("Parse Message: \n");
      Console.WriteLine(message);
      
    }
  }
}

https://developer.intuit.com/app/developer/qbdesktop/docs/develop/communicating-with-quickbooks

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Check a base quickbooks COM connection via a simple C# program 27.02.20

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