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Asked: 2026-05-28T00:04:55+00:00

I’ve written a simple console application using windows sockets to work as a proxy

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I’ve written a simple console application using windows sockets to work as a proxy between a server and a client. I decided to make a graphical interface for watching all the in/outgoing packets real time (like a very simple wireshark).

The connection between the server and the client runs on a different thread than the message loop. When the server/client sends a packet, I would like that to be displayed (for example added to a simple text control) immediately.

But since I can not access the forms from other thread than the thread where the message loop is I dont know how to handle this.

I’ve found several solutions in:
– Managed c++
– C++/CLI
– C#,
but not any without using .NET platform. (I really new to this GUI topic so I am not even sure you can use windows forms without .NET)

Maybe QT + C++ could handle this problem, but any other solution than that? If not is it possible to write a wrapper in C# / Java for the native C++ code?

There must be many applications written in C/C++ which using a GUI, what is the general way to do that?

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1 Answer

  1. Editorial Team

    You are absolutely correct that you cannot access a window in a different thread. The proper way to handle this to post a message using the ::PostMessage Win32 API command (or, if you are using a wrapper library around Win32, whatever function in that wrapper that eventually calls PostMessage). Here’s a useful link from Microsoft regarding message queues:
    http://msdn.microsoft.com/en-us/library/windows/desktop/ms644928(v=vs.85).aspx

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