Four hack in one

C#

You know, you paint or spray something the Graphics on screen monitor i.e. display. Then want fresh screen that to get rid of it. Here some hacks::

HACK 1&4

Instead: 

[StructLayout(LayoutKind.Sequential)]

public struct RECT

        {

public int Left;

            public int Top;

            public int Right;

            public int Bottom;

        }

add there constructor function so you can the “new” it like this:

RECT rECT= new RECT(100, 100, 100, 100);

Constructor I mean like this:

[StructLayout(LayoutKind.Sequential)] 

public struct RECT

        {

       

            private int Left;

            private int Top;

            private int Right;

            private int Bottom;

         

            public RECT(int left, int top, int right, int bottom) {

            Left=left;

            Top=top;

            Right=right;

            Bottom=bottom;

                }

        }

HACK 2

Instead this way to over load using “IntPtr lpRect”

[DllImport("user32.dll")]

        static extern bool InvalidateRect(IntPtr hWnd, IntPtr lpRect, bool bErase);

.... and then later:

InvalidateRect(IntPtr.Zero, IntPtr.Zero, true);

That above it refresh whole screen, use “ref RECT lpRect” instead “IntPtr lpRect” like this:

[DllImport("user32.dll")]

static extern bool InvalidateRect(IntPtr hWnd, ref RECT lpRect, bool bErase);

.... Now! You can fresh certain Rectangular instead it all.

RECT rECT= new RECT(100, 100, 100, 100);

InvalidateRect(IntPtr.Zero, ref rECT, true);

HACK 3

You can use same numbers at Rectangle and RECT this way

new Rectangle(400, 450, 192, 180)

new RECT(400, 450, 192+400, 180+450)

You see other need upper right corner and width and high, and the other just need the bounds.

That [StructLayout(LayoutKind.Sequential)]

means or it not like mean nothing, it is just like, you know cargo cult I mean there no particular reason to add it. It little bit the robustivines.