Getting Cursor Postion? (when clicked)

[pellison512]

Hey guys,

I'm new here, so I apologize if I'm not doing this correctly. I need some help in a game I'm making where I need to be able to see where on screen that someone clicked. I understand that the GetCursorPos function would help, but I'm still not really sure how to implement this in my code...at all. Do you think someone could help with a very basic, sample code that would be able to give the cursor position when clicked?

Thanks!

-Pat

[Duthomhas]

What framework or library are you using for your game? Win API?

[pellison512]

Yeah, I'm pretty sure

[Computergeek01]

"Spoons go in the spoon drawer. Forks go in the fork drawer and the Whiskernugen goes in the whiskernugen drawer." - Chowder

Following the logic of my cartoon hero; the the Windows questions are more accurately answered in the Windows section of the forum. The WinAPI function "GetCursorPos()" fills out a 'POINT' struct that describes the X and the Y 'coords' of the cursor at the moment it is called. You should put this in the event handler for the application, or you could provide some code if you need more specifics.

- GetCursorPos(): http://msdn.microsoft.com/en-us/library/windows/desktop/ms648390(v=vs.85).aspx

- POINT: http://msdn.microsoft.com/en-us/library/windows/desktop/dd162805(v=vs.85).aspx

[Disch]

The next question I have would be... is this an actual window? Or is this in the console?

If you are using an actual window, Windows will send you a WM_LBUTTONDOWN event when the user clicks. This event will have X,Y coords in the lparam:

// in your event handler:
case WM_LBUTTONDOWN:
    x = LOWORD(lparam);
    y = HIWORD(lparam);

http://msdn.microsoft.com/en-us/library/windows/desktop/ms645607%28v=vs.85%29.aspx


EDIT:

The advantage to this over GetCursorPos is not only that you are notified when the user clicks... but the position you get back is in client coords (ie: 0,0 is the upper left corner of your game's drawing space).

Whereas GetCursorPos() will give you the position in screen coords (ie: 0,0 is the upper left corner of the user's monitor)... so you will have to manually convert to client coords.

[Duthomhas]

I still think OP ought to have a better idea about how he is interfacing with the display. Is this console? Win32? Qt? SFML? FLTK?

[pellison512]

Thanks, Disch, that helps a lot. It is in a window, so this would definitely be good to use. May I just ask, though, and I'm very sorry because I'm pretty new at this, what the LOWORD(lparam) AND HIWORD(lparam) things are? Thanks so much for all your help.