com port, graphing, win32

This is a discussion on com port, graphing, win32 within the Windows Programming forums, part of the Platform Specific Boards category; Hi, I am working on a project that needs me to grab information from a com port (the info will ...

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    com port, graphing, win32

    Hi,
    I am working on a project that needs me to grab information from a com port (the info will be in decimal form, not binary) and put those numbers into a graph. BTW, This is for windows. I want the program to have a gui i.e. a "start" button when the information from the com port is needed. Does anyone have any suggestions on how to go about doing this. I have never grabbed information from a com port before... Thank you.

  2. #2
    It's full of stars adrianxw's Avatar
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    You can get a handle to the various I/O ports with the CreateFile() API routine, look it up in the help, particulaly the section dealing with "communication resources".

    Once you have a handle, you can use any of the handle based I/O routines to read and write the port.
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    Thank you adrian.
    I checked google and found help on how to open the port then write from it. I hink i understand what to do. but still have questions.
    After i get that data and write it to a file or whatever, then i will be able to make a graph out of it? BTW, the information comming in is"speed" and "force" so i need these decimal numbers to be put into a graph. Is that difficult to do?

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    It's full of stars adrianxw's Avatar
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    >>> Is that difficult to do?

    Depends, for me, no! I don't know what standard of programming you are at, but a basic X-Y scatter plot or similar is pretty straight forward.

    Describe in a little more detail how you wish the results to appear, it's a bit vague at the moment. Whatever, I'm sure we'll be able to do it.

    The attached file is just about as basic a Windows program as you can make. Have a look at it, and possibly lookup SetPixel() for plotting points, (although they will be very small, and probably not the best solution - but it gives you some idea of the task).
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    It's full of stars adrianxw's Avatar
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    Hmmm, try again!
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    well, basically i want the data to show up in a line graph with two different color lines. x=force and y=speed (the two variables needed) that is all i need really. I just want to be able to save the graph and to be able to print it off on paper.

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    Look at PolyLine(), CreateCompatibleDC() CreateCompatibleBitmap(), SelectObject() , CreateSolidBrush(), TextOut() ect

    convert the floats to ints with a factor (ie *100 for two decimal places).

    Will need to calculate a scale based on the area you have on screen (to draw in).
    remember y increases as you go down the screen

    or

    Set a world transform (that is, arbitary set the axis and scale on the HDC based on the range of values you have to graph)
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    Thanks Novacain and Adrian.

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