C / C++ / MFC

// file1.cpp
...
char* pchTest("test");
...
// file2.cpp
extern char* pchTest;
...

// CommonSettings.h
...
// unsigned char X1[16]; // no "declaration" needed
...

// Main.cpp
...
unsigned char X1[16]; // a "real" instance
...

// BC.cpp
...
extern unsigned char X1[16]; // a "shared" instance
...

// RS.cpp
...
extern unsigned char X1[16]; // a "shared" instance as well
...

#pragma once
...
// instead of
// #ifndef _HH_
// #define _HH_
// ...
// #endif

// CommonSettings.h
#pragma once
...
typedef struct s {
  int m_iVar1;
  int m_iVar2;
} myS;
typedef UCHAR myBuffer[16];
...

// file1.cpp
...
#include "CommonSettings.h"
...
myBuffer ownBuffer; // an own instance of UCHAR[16] for this file
...

// file2.cpp
...
#include "CommonSettings.h"
...
myS ownS = {0}; // an own instance of the struct myS for this file

shivanandgupta wrote:

i got proper exception in case of "Creordset::dynaset".

case WM_PAINT:
  hdc = BeginPaint(hWnd, &ps);
  paint_line(hWnd, hdc, 0, 0, 400, 400, 5, RGB(255,0,0));
  EndPaint(hWnd, &ps);
  break;