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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.
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.
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?
>>> 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).
Hmmm, try again!
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.
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)
Thanks Novacain and Adrian.