I got how to SendMessage to another process. Now I am trying to understand how to receive the message on my other process. I know how to extract my items from de COPYDATASTRUCTURE but what is the method that is called on my other process. I found a lot of stuff on how to read the received data but never how to implement it. So basically, what function/event is called when an application receives a message from SendMessage()? You must know here that I have full control on both process.
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What kind of application are you developing ? Dialog based, MDI, SDI ? – csanchez Nov 19 '12 at 17:44
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I am working on a dialog based application using MFC, I explain what it does here http://stackoverflow.com/questions/13455475/how-to-send-a-byte-array-to-another-process-in-c – Jean-François Deschênes Nov 19 '12 at 18:03
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1Have you seen this example ? http://www.codeproject.com/Articles/115/Inter-Process-Communication-using-WM_COPYDATA – csanchez Nov 19 '12 at 18:19
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The send message from another process is exactly like any send message received from the same process: Specifically the window procedure for the window the message is sent to is called with the message as parameters just as you would receive a WM_PAINT or any other op-sys message.
Elemental
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So I just have to declare a function like LRESULT CALLBACK MainWndProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam) and that function will be triggered when receiving a message am I right? – Jean-François Deschênes Nov 19 '12 at 15:45
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Consider reading this blog post, containing sample code:
Using WM_COPYDATA to marshal message parameters since the window manager otherwise doesn't know how
(You simply handle WM_COPYDATA in the receiver WndProc.)
Mr.C64
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