Thread: Centering a Window

In CreateWindowEx, is there a way to automatically center the window to the screen no matter what resolution of the machine?

Here's what I use:

Code:

CreateWindowEx(0,WNDCLS,WNDTTL,WS_BORDER | 
WS_SYSMENU | WS_VISIBLE,
GetSystemMetrics(SM_CXSCREEN)/2-160,
GetSystemMetrics(SM_CYSCREEN)/2-120,
320,240,NULL,NULL,hInstMain,NULL)

Just expounding on what Fordy was saying. The param's that are in bold get the system width and height (respectively) then divide each by 2 (center of the screen) then subtract half the width/height of the window.

[code]
int width = 100; //...now you just change this for each program...
int height = 100; //...ditto...

int screenX = GetSystemMetrics(SM_CYSCREEN);
int screenY = GetSystemMetrics(SM_CXSCREEN);

int xCtr = (screenX / 2) - (width / 2);
int yCtr = (screenY/ 2) - (height / 2);


CreateWindowEx(0,WNDCLS,WNDTTL,WS_BORDER | WS_SYSMENU | WS_VISIBLE,
xCtr,
yCtr,
width,
height,
NULL,NULL,hInstMain,NULL)
[code]

I always prefered:

Code:

/* Function CenterWindow(), Centers Window */
VOID CenterWindow(HWND hwnd, HWND hwndParent, int Width, int Height)
{

	/* Variables */
	RECT rc;

	/* If Parent Window Is Set As Null, Get The Desktop Window */
	if(hwndParent == NULL)
	{

		hwndParent = GetDesktopWindow();

	}

	/* Get Parent Client Area Measurements */
	GetClientRect(hwndParent, &rc);

	/* Center The Window */
	MoveWindow(
		hwnd,
		(rc.right - rc.left - Width) / 2,
		(rc.bottom - rc.top - Height) / 2,
		Width,
		Height,
		TRUE
	);

	return;

}

Usage for a main window 800 x 600 would be:

CenterWindow(hwnd, NULL, 800, 600);

Usage for a child window 400 x 400 would be:

CenterWindow(hwndChild, hwndParent, 400, 400);

Hope it helps.