(TIP) The method to convert 4 bytes array to float

If you have 4 byte array, for example buffer[4], you can change the byte buffer to float.


union BitConvert{
float f;
unsigned long ul;

unsigned char a,b,c,d;
a = buffer[0];
b = buffer[1];
c = buffer[2];
d = buffer[3];

BitConvert EX;
EX.ul = (a << 24)  | (b << 16) | (c << 8) | d;
// or EX.ul = (d << 24) | ( c << 16)  | (b << 8) | a; (It is depend on your plaform.)

There is float value in the "EX.f".

Thank you~. ^^

(TIP) The mean of CR, LF in the serial communication

The mean of the , is like that... in the serial communication.

LF = 10 = 0x0A = '\n'
CR = 13 = 0x0d = '\r'

Thanks you. ^^


How to install OpenGL in Window OS and Visula C++ 2008

You can download OpenCV 3.7 version on this web address http://www.opengl.org/resources/libraries/glut/glut37.zip
The Zip file has below files.

1) You have to copy these file into right directories.

x86  (32bit)
glut32.dll   = C:\Windows\System32
glut.dll       = C:\Windows\System32

x64 (62bit)
glut32.dll   = C:\Windows\sysWOW64
glut.dll       = C:\Windows\sysWOW64

glut.h        = C:\Program Files\Microsoft SDKs\Windows\v6.0A\Include\gl

glut.lib      = C:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib
glut32.lib = C:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib

※  If you met some errors, Copy files additional folder.
C:\Program Files\Microsoft Visual Studio 9.0\VC\lib
C:\Program Files\Microsoft Visual Studio 9.0\VC\include
copy glut.lib, glut32.lib and glut.h into additional folders.

2) Visual Studio Setting
Linker->input, Additional Dependencies -> opengl32.lib glu32.lib glut32.lib

This is example source code.

void Draw()

    glColor3f(1.0f, 0.0f, 1.0f);
        glVertex3f(-0.5f, 0.5f, 0.5f);
        glVertex3f(0.5f, 0.5f, 0.5f);
        glVertex3f(0.5f, -0.5f, 0.5f);
        glVertex3f(-0.5f, -0.5f, 0.1f);


void main()

This setting process is normal course, but I met the this errors message in the Visual Studio 2008.
1>NeMo.obj : error LNK2001: __imp____glutCreateWindowWithExit@8 μ™ΈλΆ€ 기호λ₯Ό 확인할 수 μ—†μŠ΅λ‹ˆλ‹€.
1>C:\Users\mare\Documents\λ„€μ΄νŠΈμ˜¨ 받은 파일\NeMo\Debug\NeMo.exe : fatal error LNK1120: 1개의 확인할 수 μ—†λŠ” μ™ΈλΆ€ μ°Έμ‘°μž…λ‹ˆλ‹€.

SO, I have solved this problem. I made OpenGL Folder at C:\OpenGL. The Folder has DLL, Lib, Header sub-folders. (DownLoad)

I have done directory setting in the Visual Studio options.
And you have to change #include <~> to #include "~" on the source code.

I want to suceess to complie OpneGL Project on your machine.
Thanks you.