구차니의 잡동사니 모음

$ cat uuid.c

#include <uuid/uuid.h>

#include <stdio.h>

void main()

{

        uuid_t out;

        uuid_generate_random(out);

        printf("%x",out);

}

$ gcc uuid.c -luuid

 typedef unsigned char uuid_t[16];

Description

 Shifts the bits in the first operand (destination operand) to the left or right by the number of bits specified in the second operand (count operand). Bits shifted beyond the destination operand boundary are first shifted into the CF flag, then discarded. At the end of the shift operation, the CF flag contains the last bit shifted out of the destination operand. The destination operand can be a register or a memory location. The count operand can be an immediate value or the CL register. The count is masked to 5 bits (or 6 bits if in 64-bit mode and REX.W is used). The count range is limited to 0 to 31 (or 63 if 64-bit mode and REX.W is used). A special opcode encoding is provided for a count of 1. The shift arithmetic left (SAL) and shift logical left (SHL) instructions perform the same operation; they shift the bits in the destination operand to the left (toward more significant bit locations). For each shift count, the most significant bit of the destination operand is shifted into the CF flag, and the least significant bit is cleared (see Figure 7-7 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1).

 The shift arithmetic right (SAR) and shift logical right (SHR) instructions shift the bits of the destination operand to the right (toward less significant bit locations). For each shift count, the least significant bit of the destination operand is shifted into the CF flag, and the most significant bit is either set or cleared depending on the instruction type. The SHR instruction clears the most significant bit (see Figure 7-8 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1); the SAR instruction sets or clears the most significant bit to correspond to the sign (most significant bit) of the original value in the destination operand. In effect, the SAR instruction fills the empty bit position’s shifted value with the sign of the unshifted value (see Figure 7-9 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1). 

case 4:

packet[4] = (val >> 24) & 0xFF;

0115687B  mov         ebx,ecx  

0115687D  sar         ebx,18h  

01156880  mov         byte ptr [edi+4],bl  

packet[5] = (val >> 16) & 0xFF;

01156883  mov         ebx,ecx  

01156885  sar         ebx,10h  

01156888  mov         byte ptr [edi+5],bl  

packet[6] = (val >> 8) & 0xFF;

0115688B  mov         ebx,ecx  

0115688D  sar         ebx,8  

01156890  mov         byte ptr [edi+6],bl  

packet[7] = (val) & 0xFF;

01156893  mov         byte ptr [edi+7],cl  

break;

01156896  jmp         $LN11+54h (11568A8h)  

break; 

char * const a;

means that the pointer is constant and immutable but the pointed data is not.

You could use const_cast(in C++) or c-style cast to cast away the constness in this case as data itself is not constant.

const char * a;

means that the pointed data cannot be written to using the pointer a. Using a const_cast(C++) or c-style cast to cast away the constness in this case causes Undefined Behavior. 

POSITION GetFirstSelectedItemPosition( ) const; 

int GetNextSelectedItem(

   POSITION& pos 

) const; 

m_slidervertical.SetBuddy(&m_ChartCtrl, FALSE);

m_slidervertical.SetRange(-10, 10);

slidervertical.SetTicFreq( 1 );

m_slidervertical.SetPos(0); 

reg->Create(IDD_CHL_REG);

reg->ShowWindow(SW_HIDE); 

reg->Create(IDD_CHL_REG, CWnd::GetDesktopWindow()); 

reg->ShowWindow(SW_HIDE);

CRegister(CWnd* pParent = NULL);   // 표준 생성자입니다.

CRegister::CRegister(CWnd* pParent /*=NULL*/) : CDialogEx(CRegister::IDD, pParent) { }

HWND WINAPI GetParent(

  _In_ HWND hWnd

); 

#include "parent.h"

((CparentDlg*)GetParent())->parent_fuction();

#include "child.h"

reg = new Cchild(this);

if(reg)

{

reg->Create(IDD_CHLREG);

reg->ShowWindow(SW_HIDE);

}