C / C++ / MFC

case WM_MOVING:
	{
		LPRECT lprc = (LPRECT)lParam;

		RECT WD;//get width and height of window - WD = WindowDimensions
		GetWindowRect(hwndDlg,&WD);
		WD.right -= WD.left;//Width
		WD.bottom -= WD.top;//Height

		RECT VDR;//VDR = VisibleDesktopRect
		SystemParametersInfo(SPI_GETWORKAREA,0,&VDR,0);

		if(lprc->left <= VDR.left + 5 &&
			lprc->left >= VDR.left - 5)//Left
		{
			lprc->left = VDR.left;
			lprc->right = lprc->left + WD.right;
		}

		if(lprc->top <= VDR.top + 5 &&
			lprc->top >=  VDR.top - 5)//Top
		{
			lprc->top = VDR.top;
			lprc->bottom = lprc->top + WD.bottom;
		}

		if(lprc->right >= VDR.right - 5 &&
			lprc->right <= VDR.right + 5)//Right
		{
			lprc->right = VDR.right;
			lprc->left = lprc->right - WD.right;
		}

		if(lprc->bottom >= VDR.bottom - 5 &&
			lprc->bottom <= VDR.bottom + 5)//Bottom
		{
			lprc->bottom = VDR.bottom;
			lprc->top = lprc->bottom - WD.bottom;
		}

		int HalfHeight = ((VDR.bottom - VDR.top) / 2) - (WD.bottom / 2);
		int HalfWidth = ((VDR.right - VDR.left) / 2) - (WD.right / 2 ); 

		if ((lprc->top >= HalfHeight - 5 && lprc->top <= HalfHeight) ||
			(lprc->top <= HalfHeight + 5 && lprc->top >= HalfHeight))//Center Up-Down
		{
			lprc->top = HalfHeight;
			lprc->bottom = lprc->top + WD.bottom;
		}

		if ((lprc->left >= HalfWidth - 5 && lprc->left <= HalfWidth) ||
			(lprc->left <= HalfWidth + 5 && lprc->left >= HalfWidth))//Center Left-Right
		{
			lprc->left = HalfWidth;
			lprc->right = lprc->left + WD.right;
		}

		return TRUE;
	} break;

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int name;<br />
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TextOut(hdc,x,y,"text",strlen("text");