SendMessage and PostMessage

[Pryabu]

In which scenario,Sendmessage and Postmessage should be used? Thanks,

[_Superman_]

You can send a standard Windows message or a user defined message using both SendMessage and PostMessage. SendMessage will wait for the message handler to complete the action, whereas PostMessage will simply queue the message to the target window's message queue. These APIs can be use to send messages to any window whether in the same process or not.

«_Superman_»
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Microsoft MVP (Visual C++)

Polymorphism in C

[rp_suman]

PostMessage places a message in the window's message queue and then returns without waiting for the corresponding window to process the message. The SendMessage function calls the window procedure directly and does not return until that window procedure has processed the message.

-- "Programming is an art that fights back!"

[Pryabu]

thanks. I want to know in which case we should use sendmessage and postmessage functions?

[_Superman_]

There can be many uses. One such use is for simple interprocess communication like sending a WM_CLOSE message to an external application. Another frequently used scenario is when you declare your own custom messages like WM_USER + 1 or WM_APP + 1.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

[Pryabu]

thanks

[KarstenK]

as others wrote ist right. I use PostMessage more for better user experience because it is non-blocking. SendMessage only for critical message. It works like a callback.

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