Calling a COM Component Directly From C#

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Calling a COM component directly from C#

Calling a COM component directly from C#

15,April,2011

This post title could be using SMTPsvg.Mailer component in c# code too:-). Recently, we had to call a COM component from C# code. The COM component in question was SMTPsvg.Mailer. Sample code in classic ASP was available. The easiest way to do this method is using Interop. But we were not in a situation to generate interop libraries. We also learned this could have been easier had we used vb.net instead of c#. On further investigation we found two links that helped us to solve the issue:

- http://blogcastrepository.com/blogs/hamzakhalid/archive/2006/11/20/2657.aspx
- http://www.codeproject.com/KB/cs/CallMethodNameInString.aspx?msg=2609468#xx2609468xx

Sample code showing usage of SMTPsvg.Mailer in c# (you might need to change values in BOLD in the code below).


object objMailer = null;
System.Type m_MailerType = System.Type.GetTypeFromProgID("SMTPsvg.Mailer");
objMailer=System.Activator.CreateInstance(m_MailerType);
m_MailerType.InvokeMember("FromName", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {"FROM_NAME"});
m_MailerType.InvokeMember("FromAddress", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {"FROM_EMAIL"});
m_MailerType.InvokeMember("RemoteHost", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {"REMOTE_HOST_NAME"});
m_MailerType.InvokeMember("Subject", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {“YOUR_SUBJECT”});
m_MailerType.InvokeMember("BodyText", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {“MAIL_BODY”});
m_MailerType.InvokeMember("ContentType", System.Reflection.BindingFlags.SetProperty, null, objMailer, new object[] {" Text/HTML "});//Content type, set to Text/HTML for HTML mail need not set this for text mails
m_MailerType.InvokeMember("AddRecipient", System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public, null, objMailer, new object[] {“RECEPIENT_NAME”,”RECEPIENT_ADDRESS”); // name value pairs
bool bReturn = (bool)m_MailerType.InvokeMember("SendMail", System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public, null, objMailer, null);

Be aware that the above method is likely to be slow, but still might be useful in some cases.