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POmoving data between processes
 

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    <p>The reason I ask this is widows do not support a good method to communicate between processes. So I want to create a DLL for a communications point between windows processes. A thread is owned by a process and cannot be given to another process. Each thread has a stack of its own. If a DLL is loaded (loadlibray) and a DLL function is called that asks windows for memory. Am I write to think the thread is still being owned by the same process and allocates memory into that same process. </p> <p>So I’m thinking can I turn to assembly to reallocate a small memory block to another process. Create a critical section, copy the data over to another (already created) memory block and return to the original block to its original process with out up setting windows. Has any one done that before. Or is thier a better way.</p> <p>Best regards, Lex Dean.</p> <hr> <p>I see other methods that mite be quite fast but I would like a very fast method that has little over head. Pipes and internet will obviously work but are not the best option yet simple to implement (thanks to offer such suggestions guys). I want to send quite a few 500 byte blocks at quite regular intervals sometimes. I like WM_COPYDATA because it looks fast, my biggest question that I have been looking all over the internet is:- GetCurrentProcess and DuplicateHandle to get the real handle. Finding the other process. And using messages to set up memory and then use WM_COPYDATA. I only need two messages a) the pointer and size b) the data has been copied. I get my application process easy ‘GetCurrentProcess’ except it’s a pseudo handle, that’s always $FFFFFFE. I need the real process handle and no body on the internet gives an example of DuplicateHandle. That’s what’s got me stumped. Can you show me an example of DuplicateHandle as that’s what’s got me stumped? </p> <p>I do not like turning to a form to get a handle as one application dose not always have a current form. I do not like turning to a form to get a handle as one application dose not always have a current form. In Delphi I have seen message sending with TSpeedButton to set up a simple fast communication methods between applications that most probably uses about 80 instructions I guess. And so I still thinking to think dll’s. The example Mads Elvheim sent is on that same line as what I already know. I'm still willing to understand any other options of using my own *.Dll Because my applications important to me can simply register/unregister on the *.DLL its own process rather than searching all the time to see if a process is current. It’s how I manage memory with a *.DLL between process but I’m not told about. To me DLL’s are not hard to implement to me as I already have one of my own in operation. </p> <p>The real bottom line is access to windows to create a good option. As I’m very open to idea’s. Even the assembly instructions for between processes or a windows call. But I do not what to get court crashing windows ether by doing things illegal. So please show an example of what you have done that is to my needs. That is fast and I’m interested as I most probably will use it anyway. </p>
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    1. COWhy have you created yet another new account to ask your question? You really do not need to do that. Simply create an OpenID account once and use that to login the next time. You just need to pick an OpenID provider that makes it easy to login. I have found a google account to be the easiest. When you are presented with the login dialog on stack overflow just click the Google image and that should be all you have to do, especially if you told Google and your browser to remember you (keep you logged in).
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    2. CO"is thier a better way" - a better way for **what**?
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