[Tips] ?: Operator and ?? Operator

Use "if" condition:
if (condition)
  result = t;
else
  result = f;

if (obj != null)
  result = obj;
else
  result = something;


Use "?:" operator
result = condition ? t : f;


Use "??" operator
result = obj ?? something;

[How to] Memory Allocate

If we want to dynamic allocate N bytes of memory.
And then, reallocate it to X bytes. After all, release it.


In the case of C/C++:
char* bp = malloc(sizeof(char) * N);
bp = realloc(bp, sizeof(char) * X);
free(bp);

[How to] Color of A Point on The Screen

using System.Drawing;
using System.Drawing.Drawing2D;

Bitmap bitmap = new Bitmap(1, 1);
Graphics g = Graphics.FromImage(bitmap);


Give a point that you want
g.CopyFromScreen(this.Location, new Point(0, 0), new Size(1, 1));


This is what you needed
Color result = bitmap.GetPixel(0, 0);