WCF and Email Attachments

First off I want to apologize for being away so long. It has been a crazy ride to say the least.

So a colleague of mine ran into an issue with WCF and emailing attachments and asked for help. In this block of code below it would always fail at:

Attachment attachment = new Attachment(fileAttachment.ContentStream, fileAttachment.Name);”     The error is : “Value cannot be null.
Parameter name: stream”

 

 

 
EmailSendInput emailSendInput = new EmailSendInput
                {
                    Attachments = new List<Attachment>(),
                    Body = model.Body,
                    To = new List<string> { model.EmailTo },
                    From = model.EmailFrom,
                    Subject = model.EmailSubject
                };

                if (model.Files != null)
                {
                    foreach (var currAttachment in model.Files)
                    {
                        if (currAttachment != null && currAttachment.ContentLength > 0)
                        {
                            // the filename needs to be nice looking
                            string fileName =
                                currAttachment.FileName.Substring(
                                    currAttachment.FileName.LastIndexOf(@”\”, System.StringComparison.Ordinal) + 1,
                                    currAttachment.FileName.Length
                                    – currAttachment.FileName.LastIndexOf(@”\”, System.StringComparison.Ordinal) – 1);

                            var attachment = new Attachment(currAttachment.InputStream, fileName);
                            emailSendInput.Attachments.Add(attachment);
                        }
                    }
                }

                B2BMortgageDataServiceAgent b2BMortgageDataServiceAgent = new B2BMortgageDataServiceAgent();
                EmailSendResponse emailSendResponse = b2BMortgageDataServiceAgent.SendEmail(emailSendInput);
                if (!emailSendResponse.Success)
                {
                    throw new Exception(emailSendResponse.Message);
                }
            }

public EmailSendResponse SendEmail(EmailSendInput input)
        {
            EmailSendResponse retVal = new EmailSendResponse();
            try
            {
               
                string smtpServer = “”
                string smtpPort = “”

                using (var client = new SmtpClient(smtpServer, Convert.ToInt32(smtpPort)))
                {
                    var mail = new MailMessage
                    {
                        From = new MailAddress(input.From),
                        Subject = input.Subject,
                        Body = input.Body
                    };
                    input.To.ForEach(t => mail.To.Add(t));

                    if (input.Attachments != null && input.Attachments.Count > 0)
                    {
                        foreach (var fileAttachment in input.Attachments)
                        {
                            //Code Crashes here
                            Attachment attachment = new Attachment(fileAttachment.ContentStream, fileAttachment.Name);
                            mail.Attachments.Add(attachment);
                        }
                    }

                    client.Send(mail);
                }

                retVal.Success = true;
            }
            catch (Exception exception)
            {
                retVal.Success = false;
                LogUtil.LogException(exception);

            
                retVal.Message = exception.ToString();
            }

            return retVal;
        }

and then the contract:

[DataContract]
    public class EmailSendInput
    {
        [DataMember]
        public string From { get; set; }

        [DataMember]
        public List<string> To { get; set; }

        [DataMember]
        public string Subject { get; set; }

        [DataMember]
        public string Body { get; set; }

        [DataMember]
        public List<Attachment> Attachments { get; set; }

    }

Implemented as:

public EmailSendResponse SendEmail(EmailSendInput input)
         {
             try
             {
                 return this.dataAgent.SendEmail(input);
             }
             catch (Exception e)
             {
                 this.logger.LogException(e, 2);
                 throw new FaultException(“An error occured in SendEmail. Error details : ” + this.BuildMessage(e));
             } 
         }

and the Email response:

[DataContract]
    public class EmailSendResponse
    {
        [DataMember]
        public bool Success { get; set; }

        [DataMember]
        public string Message { get; set; }
    }

So now we have the problem. I basically had to recreate his datamember for attachment in the contract EmailSendInput to a

public List<EmailEncodedAttachment> Attachments { get; set; }

and added a new contract called EmailEncodedAttachment and process how he was handling the attachment differently. I’ve also included the MVC controller calls in case it might help you as well.

 

SOLUTION:

[DataContract]
    public class EmailSendInput
    {
        [DataMember]
        public string From { get; set; }

        [DataMember]
        public List<string> To { get; set; }

        [DataMember]
        public string Subject { get; set; }

        [DataMember]
        public string Body { get; set; }

        [DataMember]
        public List<EmailEncodedAttachment> Attachments { get; set; }

    }

 

[DataContract]
    public class EmailEncodedAttachment
    {
        [DataMember]
        public string Base64Attachment;

        [DataMember]
        public string Name;

        /// <summary>
        /// One of the System.Net.Mime.MediaTypeNames
        /// </summary>
        [DataMember]
        public string MediaType;
    }
}
                retVal.Message = exception.ToString();
            }

            return retVal;
        }

 

public EmailSendResponse SendEmail(EmailSendInput input)
        {
            EmailSendResponse retVal = new EmailSendResponse();
            try
            {
               
                string smtpServer = ConfigurationManager.AppSettings[“SmtpServer”] ?? “url”;
                string smtpPort = ConfigurationManager.AppSettings[“SmtpPort”] ?? “portnum”;

                using (var client = new SmtpClient(smtpServer, Convert.ToInt32(smtpPort)))
                {
                    var mail = new MailMessage
                    {
                        From = new MailAddress(input.From),
                        Subject = input.Subject,
                        Body = input.Body
                    };
                    input.To.ForEach(t => mail.To.Add(t));

                    if (input.Attachments != null && input.Attachments.Count > 0)
                    {
                        foreach (var fileAttachment in input.Attachments)
                        {
                            mail.Attachments.Add(this.CreateAttachment(fileAttachment));
                        }
                    }

                    client.Send(mail);
                }

                retVal.Success = true;
            }
            catch (Exception exception)
            {
                retVal.Success = false;
                LogUtil.LogException(exception);
             
                retVal.Message = exception.ToString();
            }

            return retVal;
        }

 

The MVC controller action calls the service like so:

EmailSendInput emailSendInput = new EmailSendInput
                {
                    Attachments = new List<EmailEncodedAttachment>(),
                    Body = model.Body,
                    To = new List<string> { model.EmailTo },
                    From = model.EmailFrom,
                    Subject = model.EmailSubject
                };

                if (model.Files != null)
                {
                    foreach (var file in model.Files)
                    {
                        if (file != null && file.ContentLength > 0)
                        {
                            // the filename needs to be nice looking
                            string prettyFileName =
                                file.FileName.Substring(
                                    file.FileName.LastIndexOf(@”\”, System.StringComparison.Ordinal) + 1,
                                    file.FileName.Length
                                    – file.FileName.LastIndexOf(@”\”, System.StringComparison.Ordinal) – 1);

                            var attachment = this.CreateAttachment(prettyFileName, file.InputStream);
                            emailSendInput.Attachments.Add(attachment);
                        }
                    }
                }

                B2BMortgageDataServiceAgent b2BMortgageDataServiceAgent = new B2BMortgageDataServiceAgent();
                EmailSendResponse emailSendResponse = b2BMortgageDataServiceAgent.SendEmail(emailSendInput);
                if (!emailSendResponse.Success)
                {
                    throw new Exception(emailSendResponse.Message);
                }

 

and finally the encoding method which makes this possible:

private EmailEncodedAttachment CreateAttachment(string fileName, Stream stream)
        {
            EmailEncodedAttachment att = new EmailEncodedAttachment
            {
                Name = fileName,
                MediaType = System.Net.Mime.MediaTypeNames.Text.Plain
            };

            byte[] buffer = new byte[stream.Length];
            stream.Read(buffer, 0, (int)stream.Length);
            att.Base64Attachment = Convert.ToBase64String(buffer);

            return att;
        }

 

There you have it folks. I hope you have a great Sunday!

Get or Write Image Metadata with C#

Good morning! it’s always fun when old code gets to get used again. And it gave me an opportunity to convert this snippet to C#. Basically what we are trying to do is write or get metadata to an image. As those folks who commented on the previous post noted, this code will not remove existing metadata. It is a problem I still have not found a solution for however. If any of you know the answer please let us know! Anyway here it is converted and still useable after all this time.

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.Reflection;
using System.IO;
public class clsReadMetaData
{

public ImageMetadata ReadEXIFMetadata(string filepath)
{
FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);
Image image__1 = Image.FromStream(fs);
PropertyItem[] imagePropertyItems = image__1.PropertyItems;
ImageMetadata imageMetadata = new ImageMetadata();
foreach (PropertyItem pi in imagePropertyItems)
{
switch ((EXIFProperty)pi.Id)
{
case EXIFProperty.Title:
imageMetadata.Title = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Title = Encoding.UTF32.GetString(pi.Value)
break;
case EXIFProperty.Author:
imageMetadata.Author = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Author = Encoding.UTF8.GetString(pi.Value)
break;
case EXIFProperty.Keywords:
imageMetadata.Keywords = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Keywords = Encoding.UTF8.GetString(pi.Value)
break;
case EXIFProperty.Comments:
imageMetadata.Comments = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Comments = Encoding.UTF8.GetString(pi.Value)
break;
default:
break;
}
}
fs.Close();
return imageMetadata;
}
public void SaveEXIFMetadata(Image image, ImageMetadata metadata, string filepath)
{
SaveEXIFMetadataProperty(image, EXIFProperty.Title, metadata.Title, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Author, metadata.Author, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Keywords, metadata.Keywords, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Comments, metadata.Comments, filepath);
}
private void SaveEXIFMetadataProperty(Image image, EXIFProperty property, string propertyValue, string filepath)
{
PropertyItem propertyItem = CreatePropertyItem();
propertyItem.Id = Convert.ToInt32(property);
// Type=1 means Array of Bytes.
propertyItem.Type = 2;
propertyItem.Len = propertyValue.Length;
//propertyItem.Value = Encoding.Unicode.GetBytes(propertyValue)
propertyItem.Value = Encoding.UTF8.GetBytes(propertyValue);
image.SetPropertyItem(propertyItem);
image.Save(filepath);
}
private PropertyItem CreatePropertyItem()
{
System.Reflection.ConstructorInfo ci = typeof(PropertyItem).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public, null, new Type[0], null);
return (PropertyItem)ci.Invoke(null);
}
}
public enum EXIFProperty
{
Title = 40091,
Author = 40093,
Keywords = 40094,
Comments = 40092
}
public class ImageMetadata
{
private string _title = string.Empty;
private string _author = string.Empty;
private string _keywords = string.Empty;
private string _comments = string.Empty;
public ImageMetadata()
{
this._title = string.Empty;
this._author = string.Empty;
this._keywords = string.Empty;
this._comments = string.Empty;
}
public ImageMetadata(string title, string author, string keywords, string comments)
{
this._title = title;
this._author = author;
this._keywords = keywords;
this._comments = comments;
}
public string Title
{
get
{
return this._title;
}
set
{
this._title = value;
}
}
public string Author
{
get
{
return this._author;
}
set
{
this._author = value;
}
}
public string Keywords
{
get
{
return this._keywords;
}
set
{
this._keywords = value;
}
}
public string Comments
{
get
{
return this._comments;
}
set
{
this._comments = value;
}
}
}

Join me on Facebook

Encryption and Decryption of strings with C#

Well I am checking out the Beale Street Historic District for the first time in Memphis, TN tonight. I have heard a lot about it since my arrival here so am excited to get to go. I think it will be fun.

Of course this would come up. I had written this previously in vb.net and I had the opportunity to use it again today. Of course in doing so, I discovered a bad coding practice violation I had committed. I had failed to return a value in my function’s Catch block of my code. C# doesn’t let you off the hook so easily and will bug you till you fix it. As noted previously, topic is encryption and decryption of strings. It is straightforward but you might find it useful. Simply pass in the string you want to encrypt/decrypt and the key you want to use.

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class Crypto
{
    private static TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
    private static MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
    public static byte[] MD5Hash(string value)
    {
        return MD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(value));
    }
    public static string Encrypt(string stringToEncrypt, string key)
    {
        DES.Key = Crypto.MD5Hash(key);
        DES.Mode = CipherMode.ECB;
        byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(stringToEncrypt);
        return Convert.ToBase64String(DES.CreateEncryptor().TransformFinalBlock(Buffer, 0, Buffer.Length));
    }
    public static string Decrypt(string encryptedString, string key)
    {
        try
        {
            DES.Key = Crypto.MD5Hash(key);
            DES.Mode = CipherMode.ECB;
            byte[] Buffer = Convert.FromBase64String(encryptedString);
            return ASCIIEncoding.ASCII.GetString(DES.CreateDecryptor().TransformFinalBlock(Buffer, 0, Buffer.Length));
        }
        catch (Exception ex)
        {
            MessageBox.Show(“Invalid Key”, “Decryption Failed”, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }
// Inserted the following ‘return’ since all code paths must return a value in C#:
        return null;
    }
}

And now it’s usage…..

public class Form1
{
    private void Button1_Click(object sender, System.EventArgs e)
    {
        string key = Microsoft.VisualBasic.Interaction.InputBox(“Enter a Key:”, “”, “”, -1, -1);
        Label1.Text = Crypto.Encrypt(TextBox1.Text, key);
        TextBox1.Clear();
    }
    private void Button2_Click(object sender, System.EventArgs e)
    {
        string key = Microsoft.VisualBasic.Interaction.InputBox(“Enter a Key:”, “”, “”, -1, -1);
        TextBox1.Text = Crypto.Decrypt(Label1.Text, key);
    }

    }

Join me on Facebook

Create Computer Account in Active Directory and add it to Domain with C#

I was asked to convert this code from my original post to C# by a friend who obviously didn’t want to do it himself. There was one conversion issue along the way I also fixed which is why I suspect he didn’t convert it himself. In other news, my assimilation into Memphis, TN is going well. I am slowly becoming accustomed to the heat and humidity and am trying to fight off the urge to eat everything in sight because the food is just amazing if a tad bit unhealthy. I finally am getting my car fixed and am looking forward to getting out and seeing this town for myself. Let’s hope it will be a lot of fun. Ok back to what you came here for. Here you go…..

DirectoryEntry Entry = new DirectoryEntry(“LDAP://” + ActiveDirectoryTree.SelectedNode.Name, strDomain + “\\” + strUser, strPass, AuthenticationTypes.Secure);
            string ComputerName = null;
            string CompSystem = null;
            int ComputerCount = ComputerList.Items.Count;
            int i = 0;
            for (i = 0; i <= ComputerCount – 1; i++)
            {
                CompSystem = ComputerList.Items(i).Text;
                DirectoryEntry ComputerEntry = Entry.Children.Add(“CN=” + CompSystem + “”, “Computer”);
                ComputerEntry.Properties(“sAMAccountName”).Value = “” + CompSystem + “”;
                ComputerEntry.CommitChanges();
                int exp = Convert.ToInt32(ComputerEntry.Properties(“UserAccountControl”).Value);
                ComputerEntry.Properties(“UserAccountControl”).Value = exp | 0x1;
                ComputerEntry.CommitChanges();
                int val = Convert.ToInt32(ComputerEntry.Properties(“UserAccountControl”).Value);
                ComputerEntry.Properties(“UserAccountControl”).Value = val & ~0x2;
                ComputerEntry.CommitChanges();
                ComputersCreated.Text = ComputersCreated.Text + CompSystem + Environment.NewLine;
                ComputerEntry.Close();
                ComputerEntry.Dispose();
            }
            ComputersCreated.Text = ComputersCreated.Text + “——————————” + Environment.NewLine;
            Entry.Close();
            Entry.Dispose();

and to add to the domain:

string[] args = new string[5];
string[] args2 = new string[3];

// The one difference from the vb.net version. Commented this declaration since looping variables in ‘foreach’

//loops are declared in the ‘foreach’ header in C#:
//            ManagementObject comp = null;

            ManagementObjectCollection comps = null;
            ManagementClass clsComps = new ManagementClass(“Win32_ComputerSystem”);

            comps = clsComps.GetInstances();

            foreach (ManagementObject comp in comps)
            {
               // this == used to join the domain
               args[0] = “DOMAIN to join”;
               args[1] = “Password”;
               args[2] = “User with domain privs”;
               args[3] = “Specify OU Here (ou=test,dc=domain,dc=com)”;
               args[4] = “1”;
                UInt32 retVal = 0;

                retVal = comp.InvokeMethod(“JoinDomainOrWorkgroup”, args);

                retval2 = Convert.ToString(retVal);
                if (retval2 == “0”)
                {
                MessageBox.Show(“Welcome to the domain”);
                    Close();
                }
                else
                {

End If

             }

Join me on Facebook

Convert Visio Pages to Images in vb.net

I have been fooling around with Visio automation since attempting to help a friend with a project that did so. In the course of this I did this code snippet to convert the Visio page to an image. The code loops through and takes each page and converts it to an image. Pretty basic. I have not posted in a while and my apologies to those of you who were wondering….

Here is the code….

Sub SaveAsImage()
‘ creates an invisible Visio instance, opens a document, then
‘ saves all pages in the document as jpg images using
‘ page name and page number as file name
 
    Dim vsoApp As Visio.Application
    Dim vsoDoc As Visio.Document
    Dim PathName As String, jpgName As String
    Dim pg As Visio.Page
  
    Set vsoApp = CreateObject(“Visio.InvisibleApp”)
    ‘ SET PATH/FILENAME BELOW TO VSD ON YOUR SYSTEM
    Set vsoDoc = vsoApp.Documents.Open(“c:\TEST\test.vsd”)
  
    PathName = vsoApp.Documents(1).Path      ‘ Set pathname to that of first document
           
    For Each pg In vsoApp.ActiveDocument.Pages
        jpgName = PathName & Format(pg.Index, “0#”) & ” ” & pg.Name & “.jpg”
        pg.Export jpgName
    Next
   
    vsoDoc.Close
    vsoApp.Quit
    Set vsoDoc = Nothing
    Set vsoApp = Nothing
 
End Sub

Write Microsoft Word Document Header and Footer with C#

Again I am rewriting some of the more popular entries in this blog as C#. It’s good exercise for me and good for you because you get the code another way. Well at least that’s the theory! This entry writes to the header and footer of a document in Microsoft Word The vb.net version was here. The only downside to all of this is that this is only tested against Office 2010. The old version I had Office 2000, XP and 2003 on my machine. Essentially however it is the same code. If you have any questions of course please feel free to leave a comment or email me.

public void WriteHeaderandFooterinWordDocument()
{
Word.Document oDoc = new Word.Document();
oDoc.Application.Visible = true;
oDoc.Content.Application.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekCurrentPageHeader;// = Convert.ToInt32(Word.WdSeekView.wdSeekCurrentPageHeader);
oDoc.Content.Application.Selection.TypeText(“Martens “);
oDoc.Content.Application.Selection.Fields.Add(oDoc.Content.Application.Selection.Range, Word.WdFieldType.wdFieldEmpty, “PAGE”);
oDoc.Content.Application.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekMainDocument;
oDoc.Content.Application.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekCurrentPageFooter;
oDoc.Content.Application.Selection.TypeText(“Martens”);
oDoc.Content.Application.ActiveWindow.ActivePane.View.SeekView = Word.WdSeekView.wdSeekMainDocument;
}

I’m on Facebook