Network Programming in .NET

In a world of email, sometimes a letter caries more weight. It is more likely to be read, and has a nice physical quality to it. Docmail offers an automated service to send PDFs as physical mail to an address automatically, and here’s some C# code to show how it’s done.

1. Create a new project, and make a service reference to https://www.cfhdocmail.com/LiveAPI/DMWS.asmx – call the reference ServiceReference2
2. Importantly: modify your app.config changing the binding to say maxReceivedMessageSize=”2147483647″  like follows;
   

   <?xml version=”1.0″ encoding=”utf-8″ ?>
   <configuration>
   <startup>
   <supportedRuntime version=”v4.0″ sku=”.NETFramework,Version=v4.5″ />
   </startup>
   <system.serviceModel>
   <bindings>
   <basicHttpBinding>
   <binding name=”DMWSSoap” maxReceivedMessageSize=”2147483647″ >
   <security mode=”Transport” />

   </binding>
   <binding name=”DMWSSoap1″ maxReceivedMessageSize=”2147483647″/>
   </basicHttpBinding>
   </bindings>
   <client>
   <endpoint address=”https://www.cfhdocmail.com/LiveAPI/DMWS.asmx&#8221;
   binding=”basicHttpBinding” bindingConfiguration=”DMWSSoap”
   contract=”ServiceReference2.DMWSSoap” name=”DMWSSoap”

   >
   </endpoint>
   </client>
   </system.serviceModel>
   </configuration>

3. Ensure you’ve got a username and password with Docmail, as I’ve omitted this from the code, and the postal address is obscured.
   

   using System;
   using System.IO;

   namespace Docmail
   {
   class Program
   {
   static void Main()
   {
   // Need reference to https://www.cfhdocmail.com/LiveAPI/DMWS.asmx
   // put maxReceivedMessageSize=”2147483647″ into the binding
   SendFile(“email@gmail.com”,”password”);
   }

   //(where ServiceReference2 is the root namespace for the web service reference)
   private static void SendFile(string sUsr, string sPwd)
   {
   var bFile = File.ReadAllBytes(@”C:\Users\Fiach\Documents\MBCloud Invoice.pdf”);
   var oService = new ServiceReference2.DMWSSoapClient();
   var oSAH = new ServiceReference2.ServiceAuthHeader
   {
   Username = sUsr,
   Password = sPwd
   };
   var oMailing = new ServiceReference2.Mailing();
   var oAddress = new ServiceReference2.Address();
   oMailing.MailingDescription = “Test mail.”;
   oMailing.IsBlackAndWhite = false;
   oMailing.IsDuplex = false;
   oMailing.AddressNameFormat = “T”;
   {
   oAddress.Title = “MR”;
   oAddress.FirstName = “Bob”;
   oAddress.Surname = “Jones”;
   oAddress.JobTitle = “”;
   oAddress.FullName = “Bon Jones”;
   oAddress.Address1 = “10 Main Street”;
   oAddress.Address2 = “London”;
   oAddress.Address3 = “SW1 444”;
   oAddress.Address4 = “England”;
   oAddress.Address5 = “(UK)”;
   }
   //add address to mailing
   var oAddresses = new ServiceReference2.Address[1];
   oAddresses.SetValue(oAddress, oAddresses.Length – 1);
   oMailing.Addresses = oAddresses;
   var oTemplate = new ServiceReference2.Template();
   {
   oTemplate.FileData = bFile;
   oTemplate.FileName = “tsftfile.pdf”;
   oTemplate.TemplateName = “TemplateName”;
   oTemplate.AddressedDocument = true;
   }
   //add template to mailing
   var oTemplates = new ServiceReference2.Template[1];
   oTemplates.SetValue(oTemplate, oTemplates.Length – 1);
   oMailing.Templates = oTemplates;
   //Save mailing
   var oMailingResult = oService.SaveMailing(oSAH, oMailing);
   if (!oMailingResult.Success) throw new Exception(string.Format(“Mailing error: {0}”, oMailingResult.FailureMessage));
   //Create a proof of the mailing
   var oProof = oService.GetProof(oSAH, oMailingResult.MailingGUID, true);
   var iSecondCount = 0;
   //Loop for 3 mins waiting for a proof
   while ((iSecondCount < 180) && oProof.Success && !oProof.ProofReady)
   {
   //Sleep for 5 seconds
   System.Threading.Thread.Sleep(1000);
   oProof = oService.GetProof(oSAH, oMailingResult.MailingGUID, true);
   iSecondCount += 1;
   }
   if (!oProof.Success | !oProof.ProofReady) throw new Exception(“Proof not ready within 3 mins”);
   //Place the order
   var oOrderResult = oService.PlaceOrder(oSAH, oMailingResult.MailingGUID, “”);
   if (!oOrderResult.Success) throw new Exception(string.Format(“PlaceOrder error: {0}”, oOrderResult.FailureMessage));
   }
   }
   }

Need to remember when to renew a SSL cert?, here’s some handy code in c#

using System;
using System.Net;
using System.Security.Cryptography.X509Certificates;

namespace CheckSSL
{
class Program
{
static void Main(string[] args)
{
//Do webrequest to get info on secure site
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(“https://www.avatarapi.com&#8221;);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
response.Close();

//retrieve the ssl cert and assign it to an X509Certificate object
X509Certificate cert = request.ServicePoint.Certificate;

//convert the X509Certificate to an X509Certificate2 object by passing it into the constructor
X509Certificate2 cert2 = new X509Certificate2(cert);

string cn = cert2.GetIssuerName();
string cedate = cert2.GetExpirationDateString();

Console.WriteLine(cn);
Console.WriteLine(cedate);

Console.ReadLine();
}
}
}

Yes, I just got an apple watch, and the first thing I want to do with it, is to learn to program on it. so, apart from a simple “Hello World” app. I wanted to create a very simple companion app for a bitcoin app (https://itunes.apple.com/gb/app/get-bitcoin/id1072062149?mt=8)  – which just looks up the BTC / USD exchange rate and shows it on the watch.

So, here’s the code;

@interface InterfaceController()

@property (unsafe_unretained, nonatomic) IBOutlet WKInterfaceLabel *lblHello;

@end

@implementation InterfaceController

– (void)awakeWithContext:(id)context {

    [super awakeWithContext:context];

    // Configure interface objects here.

     [self.lblHello setText:@”Loading…”];

    // make request to https://blockchain.info/tobtc?currency=USD&value=1

    NSURL *url = [NSURL URLWithString:@”https://blockchain.info/tobtc?currency=USD&value=1&#8243;];

    NSError* error;

    NSString *content = [NSString stringWithContentsOfURL:url encoding:NSASCIIStringEncoding error:&error];

    // Check for network errors

    if (error)

    {

       [self.lblHello setText:@”Network error”];

       return;

    }

    // Get reciprocal

    float fRate = [content floatValue];

    float fReciprocal = 1 / fRate;

    

    NSString *str = [NSString stringWithFormat:@”$%.2lf”, fReciprocal];

    

    [self.lblHello setText:str];

}