Retrieving Property Information by Mapi Property Tag

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MapiProperty Class represents a Mapi property, which contains:

• Name, a string represents the name of the property
• Tag, a long represents the tag of the property
• Data, a byte array represents the data of the property

Steps to Query Mail Box Status

• Create a MapiMessage instance by loading from files or stream
• Get the MapiProperty from MapiMessage.Properties by MapiPropertyTag keys
• Get the Data of the MapiProperty by method GetXXXX

Example

 [C#]

 //load from file
 MapiMessage msg = MapiMessage.FromFile(@”c:\test.msg”);

 string subject;

 //access the MapiPropertyTag.PR_SUBJECT property 
 MapiProperty prop = msg.Properties[MapiPropertyTag.PR_SUBJECT];

 //if the prop is not found, check the MapiPropertyTag.PR_SUBJECT_W (which is a unicode peer of the MapiPropertyTag.PR_SUBJECT)
 if (prop == null)
 {
   prop = msg.Properties[MapiPropertyTag.PR_SUBJECT_W];
 }

 //cannot found
 if (prop == null)
 {
   Console.WriteLine(“No property found!”);
   return;
 }

 //get the property data as string
 subject = prop.GetString();

 Console.WriteLine(“Subject:” + subject);

[VB.NET]

 ‘load from file
 Dim msg As MapiMessage =  MapiMessage.FromFile(“c:\test.msg”) 
 
 Dim subject As String
 
 ‘access the MapiPropertyTag.PR_SUBJECT property 
 Dim prop As MapiProperty =  msg.Properties(MapiPropertyTag.PR_SUBJECT) 
 
 ‘if the prop is not found, check the MapiPropertyTag.PR_SUBJECT_W (which is a unicode peer of the MapiPropertyTag.PR_SUBJECT)
 If prop Is Nothing Then
   prop = msg.Properties(MapiPropertyTag.PR_SUBJECT_W)
 End If
 
 ‘cannot found
 If prop Is Nothing Then
   Console.WriteLine(“No property found!”)
   Return
 End If
 
 ‘get the property data as string
 subject = prop.GetString()
 
 Console.WriteLine(“Subject:” + subject)