Message Constructor (Object^, IMessageFormatter^)
Initializes a new instance of the Message class using the specified formatter to serialize the specified object into the body of the message.
Assembly: System.Messaging (in System.Messaging.dll)
Parameters
- body
-
Type:
System::Object^
The object to be serialized into the body of the message.
- formatter
-
Type:
System.Messaging::IMessageFormatter^
A IMessageFormatter that specifies the formatter with which to serialize the message body.
Use this overload to create a new instance of the Message class that contains the Body specified by the body parameter and that uses any valid formatter to serialize the body. The body parameter is any object that can be serialized, such as a text string, a structure object, a class instance, or an embedded object. If you change the Body or Formatter property at any time before calling Send, the message will be serialized according to the new property value.
The XmlMessageFormatter is loosely coupled, so it is not necessary to have the same object type on the sender and receiver when using this format. The ActiveXMessageFormatter and BinaryMessageFormatter serialize the data into binary representation. The ActiveXMessageFormatter is used when sending or receiving COM components.
The following table shows initial property values for an instance of Message.
Property | Initial value |
|---|---|
AcknowledgeType.None | |
null | |
0 | |
true | |
Microsoft Base Cryptographic Provider version 1.0 | |
CryptoProviderType.RSA_FULL | |
The body parameter. | |
Stream.null | |
0 | |
Guid.Empty | |
An empty string ("") | |
A zero-length array of bytes | |
A zero-length array of bytes | |
EncryptionAlgorithm.RC2 | |
A zero-length array of bytes | |
The formatter parameter. | |
HashAlgorithm.MD5 | |
An empty string ("") | |
MessagePriority.Normal | |
false | |
null | |
A zero-length array of bytes | |
Message.InfiniteTimeout | |
Message.InfiniteTimeout | |
null | |
false | |
false | |
false | |
false | |
false |
#using <system.dll> #using <system.messaging.dll> #using <system.drawing.dll> using namespace System; using namespace System::Messaging; using namespace System::Drawing; using namespace System::IO; /// <summary> /// Provides a container class for the example. /// </summary> ref class MyNewQueue { public: //************************************************* // Creates a new queue. //************************************************* static void CreateQueue( String^ queuePath ) { try { if ( !MessageQueue::Exists( queuePath ) ) { MessageQueue::Create( queuePath ); } else { Console::WriteLine( "{0} already exists.", queuePath ); } } catch ( MessageQueueException^ e ) { Console::WriteLine( e->Message ); } } //************************************************* // Sends an image to a queue, using the BinaryMessageFormatter. //************************************************* void SendMessage() { try { // Create a new bitmap. // The file must be in the \bin\debug or \bin\retail folder, or // you must give a full path to its location. Image^ myImage = Bitmap::FromFile( "SentImage::bmp" ); // Connect to a queue on the local computer. MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" ); Message^ myMessage = gcnew Message( myImage,gcnew BinaryMessageFormatter ); // Send the image to the queue. myQueue->Send( myMessage ); } catch ( ArgumentException^ e ) { Console::WriteLine( e->Message ); } return; } //************************************************* // Receives a message containing an image. //************************************************* void ReceiveMessage() { try { // Connect to the a queue on the local computer. MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" ); // Set the formatter to indicate body contains an Order. myQueue->Formatter = gcnew BinaryMessageFormatter; // Receive and format the message. Message^ myMessage = myQueue->Receive(); Bitmap^ myImage = static_cast<Bitmap^>(myMessage->Body); // This will be saved in the \bin\debug or \bin\retail folder. myImage->Save( "ReceivedImage::bmp", System::Drawing::Imaging::ImageFormat::Bmp ); } catch ( MessageQueueException^ ) { // Handle Message Queuing exceptions. } // Handle invalid serialization format. catch ( InvalidOperationException^ e ) { Console::WriteLine( e->Message ); } catch ( IOException^ e ) { // Handle file access exceptions. } // Catch other exceptions as necessary. return; } }; //************************************************* // Provides an entry point into the application. // // This example sends and receives a message from // a queue. //************************************************* int main() { // Create a new instance of the class. MyNewQueue^ myNewQueue = gcnew MyNewQueue; // Create a queue on the local computer. MyNewQueue::CreateQueue( ".\\myQueue" ); // Send a message to a queue. myNewQueue->SendMessage(); // Receive a message from a queue. myNewQueue->ReceiveMessage(); return 0; }
Available since 1.1