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C# SendMessage string with WM_COPYDATA

I need a code example of a working SendMessage api call in C# which sends a string, and also a WndProc example of how it is received and turned into a string again. Im tired of fighting this. Also, how to send a simple integer would also be a plus..

rsriprac

Hello,

Have you seen this post?

http://www.dotnet247.com/247reference/msgs/43/217002.aspx

They suggest to pass strings via WM_COPYDATA and not use SendMessage for string. Heres to decoding:

http://www.dotnet247.com/247reference/msgs/7/35565.aspx

-Ram

c03dn

ASKER

WM_COPYDATA would be used in with SendMessage, as it would have been the actual message code. None of the sites really made me wiser, I need a code example.. both send and receive.

rsriprac

How about the source from here:

http://www.codeproject.com/threads/ipc_wmcopy.asp

-Ram

c03dn

ASKER

That's c++.. for one, it's using CSTRING. I need a full c# sample with the dll imports and all.

c03dn

ASKER

I can't even send a simple integer. Even though my lparam parameter in SendMessage is int, the message received has an IntPtr. How do I get the integer value? .toInt32() doesn't give me the right value. I am guessing it is a pointer to a memory adress, and how do I work with that? Do I need to use unsafe?

c03dn

ASKER

I found a suitable solution at:
http://www.mail-archive.com/dotnet@discuss.develop.com/msg01837.html

ASKER CERTIFIED SOLUTION

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