dev-cpp-users

[Dev-C++] Static Control Flickers

[Janos M. <ma...@fr...>]

Hello everyone,

I`m working on a project (developing with dev-cpp) what measures voltage. 
Values must update every 100 milliseconds. Thats my problem. When I update 
the static controls like LTEXT and CTEXT, it flickers. Updating with 
SetDialogItemText and SetWindowText produce the same result. If I double 
buffer the static control, create a memory bitmap and a DC, and do a TextOut 
inside the control, and BitBlt it, it works fine, doesn`t flicker. My 
problem is, I didn`t found any solution to use SetDialogItemText correctly. 
I don`t think double buffer and TextOut is the best way to avoid flicker on 
static controls, because in this case the control is unneeded, but I would 
like to use some design stuff which static controls has, and don`t want to 
rewrite it.

Any ideas?

Ps.: Sorry for my english.

Re: [Dev-C++] Static Control Flickers

[w.y. <yok...@ve...>]

Janos Makadi wrote:
> 
> I`m working on a project (developing with dev-cpp) what measures voltage.
> Values must update every 100 milliseconds. Thats my problem. When I update
> the static controls like LTEXT and CTEXT, it flickers.

I have had a similar problem with flickering when I was using DirectDraw
to display changes in the mouse position. What I did was instead of
updating every time no matter what, save the old value in a variable,
oldValue for example. Every time you get the new value:

if ( newValue != oldValue )
{
	oldValue = newValue;
	... 	// update display
}

If the value changes frequently then you will still have
some flicker, but there will be little or no flicker otherwise.