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Thread: Use specific port on a client QTcpSocket

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    Default Use specific port on a client QTcpSocket

    I'm trying to set it up so that when a client connects to a server, the client uses a specified port. Right now the client uses a random port. It looked like binding would work, but it didn't change anything it still used a random port. Is there a way to force the client to use a specific port? I'm using Windows 10, Visual Studio 2013, and Qt 5.4.1 64-bit. If you need something like a sample of the code, let me know. It's kind of a pain. My work computer doesn't have internet, so I have to burn it to a CD, carry it over, and transfer to the computer that has internet. But if it will help, I'm willing to do it.

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    Default Re: Use specific port on a client QTcpSocket

    Why do you need the client to use a specified port? This is not usually desired as the port might be in use by some other software. You should be able to use bind() to do this unless your OS prevents you from binding to a specific port (e.g. ports lower than 1024 are usually reserved).
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    Default Re: Use specific port on a client QTcpSocket

    For whatever reason, IT department asked for it if possible. I used the following code but it doesn't seem to work.


    Qt Code:
    1. .h
    2. QTcpSocket *m_pSocketClient;
    3.  
    4. .cpp
    5. m_pSocketClient = new QTcpSocket(this);
    6. m_pSocketClient->bind(Specified Address, Specified Port);
    7. m_pSocketClient->connectToHost(Server Address, Server Port);
    To copy to clipboard, switch view to plain text mode 


    It still uses a random port. What am I doing wrong?

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    Default Re: Use specific port on a client QTcpSocket

    What is the port you're trying to bind to? Does bind() return true? Note, you might need to force a flag for reusing the port, otherwise you won't be able to bind the socket shortly (e.g. minutes) after the previous connection using that port is closed.
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    Default Re: Use specific port on a client QTcpSocket

    It's returning true. For testing purposes I'm using port 33336. The chances of that one being used are slim. I've tried all the possible flags, and none of them made a difference. It still uses a random port

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