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Sending data while pushbutton is down?

Posted on 1999-01-14
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Last Modified: 2013-11-20
I am using a CButton pushbutton on a VC++5 formview app.  I want to send data to the serial port while I keep the button down and it must stop to send when I release the button. I have sorted out sending data to the serial port.  How can I send it WHILE THE BUTTON IS DOWN?
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Question by:heinv
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by:heinv
ID: 1327658
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koskia earned 90 total points
ID: 1327659
I guess you map both WM_LBUTTONDOWN and WM_LBUTTONUP, what you need to do is just send your data while you're in the OnLButtonDown() function, and check every X time, if a WM_LBUTTONUP message was recieved by the window, the function for that is PeekMessage:

void CMyButton::OnLButtonDown(UINT nFlags, CPoint point)
{
    bool IsUp = false;
    LPMSG pMsg;

    SetCapture();
    while (!IsUp)
    {
        if (PeekMessage(pMsg, m_hWnd, WM_LBUTTONUP,
        WM_LBUTTONUP, PM_NOREMOVE))
                IsUp = true;
        else
                SendSomeData();
    }
}

It's pretty self explanatory, but I'll explain anyway,
PeekMessage function checks if there are any messages of a given range in the windows queue,
the first parameter is a pointer to a message function (you don't really need that because you're only interested in 1 message).
if there are no messages of the given range, the function return 0, and you only have to check this return value.

the second parameter is a handle to the window (m_hWnd is a public member of every CWnd derived class)

the second and third parameters are the first and last message in a range of messages.
the last parameter is a flag, which indicates if a found message should be removed from the queue.

you check each X milliseconds, and send some more data, no simpler than that.
       
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