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| communication between native c++ thread in dll and c# |
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This message was discovered on microsoft.public.dotnet.framework.interop.
Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions.
| cody |
| GOOD ANSWER |
hi i have the following scenario here:
i have a gui written in c#. the gui has to load a certain dll (written in
native c++) and call one function in it which starts a thread. this thread
runs during the whole time in the program.
the problem now is the gui has to communicate with this thread. i need to
send commands to the thread and the thread has to send results to the gui
code.
i already know how to call native code but how can i achieve this
communication after the thread has been started?
cody
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| David Stucki [MS] |
| GOOD ANSWER |
If you were doing this same thing all in C++ how would you do it? A
possibility would be one thread would signal a shared syncronization object
that the worker thread was waiting on (or checking periodically) to do
something. I would get this working in straight C++. Then the C++ code
that signals the worker thread could be wrapped in a simple exported
function call, which you can then use from the managed code.
David Stucki
Microsoft Developer Support
This posting is provided "AS IS" with no warranties, and confers no rights.
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| cody |
| GOOD ANSWER |
[Original message clipped]
oh my god this sounds very complicated. my experience in threading in c++ is
so not good.
ok, if i want to c# gui from my c++ thread i have to call a delegate. but
how can i call managed code from native c++? and what do you mean with
"shared syncronization object"?
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| Thomas Scheidegger [MVP] NETMaster (VIP) |
| GOOD ANSWER |
> how can i call managed code from native c++?
also with a delegate.
Note, the C++ callback signature must have the __stdcall
calling convention, C# only supports this one.
I have prepared a VS.NET solution that shows exactly this:
http://dnetmaster.net/source/CSharpGuiCppThread.zip
[17KB size] (USE AT YOUR OWN RISK)
It contains two projects:
'CSharpApp' a C# Windows Forms application
'CppDll' a VC++/Win32 DLL
flow:
C# GUI Button => DLL API / C++ starts worker thread
and:
C# delegate <= callback from C++ worker thread
||
form.Invoke
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C# GUI ProgressBar
finally:
C# GUI Button => DLL API / C++ stops worker thread
Just watch for deadlocks & reentrant code!
--
Thomas Scheidegger - MVP .NET - 'NETMaster'
http://www.cetus-links.org/oo_dotnet.html - http://dnetmaster.net/
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| cody |
| GOOD ANSWER |
[Original message clipped]
thank you a lot, Thomas, you are great!
cody
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| dagos dag |
| GOOD ANSWER |
hi,
thanks very much, your sample code is exelent.
I use the DLL thread with a VB application and no problems.
That's really usefull!
bye
--------------------------------
From: dagos dag
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