Finding coordinates inside a window that has been scrolled

[Nathan Going]

Here’s what i am trying to do. My application call setcapture, then on the window that is clicked i would like to retrieve the coordinates inside that window. In lmousebuttondown i convert clienttoscreen, get hwnd from windowfrompoint, and then call screentoclient with the hwnd of the target window. The coordinates are the client area, but arent correct if the window is being scrolled. What can i do? Thanks

[Nibu babu thomas]

Nathan Going wrote:

The coordinates are the client area, but arent correct if the window is being scrolled. What can i do?

Use GetScrollInfo, add amount scrolled(lpsi->nPos) to retrieved client co-ordinates. Hope this helps!

Nibu thomas Microsoft MVP for VC++ Code must be written to be read, not by the compiler, but by another human being. Programming Blog: http://nibuthomas.wordpress.com

[Iain Clarke Warrior Programmer]

Just to add to the other reply. The scroll window has no actual relationship to window it is attached to. Take notepad for example. Every time you click on the up arrow on the scroll bar, the text moves by one line of text. So the amount of pixels will vary depending on the font size. Which won;t really be available to some external program. When a program uses scroll bars, and is asked to paint a window, it gets the scroll pos, and interprets that however it likes. And how they do it will be app dependent... Iain.

Iain Clarke appears because CPallini still cares.