C / C++ / MFC

#include <stdio.h>
typedef unsigned  int  DWORD32;

#pragma pack(push,4)
typedef struct
{
	char i;
	double x;
}unPacked;
#pragma pack(pop)





typedef struct {
  char i;
  double x;
}packed_structure_t;



typedef struct
{
	DWORD32
			i :8,
	    	x :23;

}bitField32;





void PrintBits(int size, unsigned char *bytes)
{
  int j=0;
  int on = 1;
  int off = 0;
  int t;
  char *b = ((char *) &bytes);
  int i;
  
  for (i=0; i<size; ++i)
  {
	 
	 printf("\nByte%d  ",j++);
	 
	 for(t=7; t>=0; --t)
		  
		if(bytes[i] & (1 << t))
			
			  printf("%d",on);
		  else
			  printf("%d",off);
  }
  printf("\n\n");
 }


int main(int argc, char *argv[])
{
  
  bitField32 s;
  unPacked n;
  packed_structure_t p;
  

 
for(;;) {
    int i;
    double x;
	


  
	printf("\n");
    printf("Type in an int and a double: ");
    scanf(" %d %lf", &i, &x);
   
	printf("\n");
    p.i=i;
    p.x=x;
	printf("Packed binary representation of a structure:\n");
	PrintBits(sizeof(p),(unsigned char*)&p);
	
   
	
	n.i=i;
	n.x=x;
	printf("Unpacked binary representation of a structure:\n");
	PrintBits(sizeof(n),(unsigned char*)&n);

	
   
	
	s.i=i;
	s.x=x;
	printf("Bit Field representation of a structure:\n");
	PrintBits(sizeof(s),(unsigned char*)&s);
	


  }

}

void pteTable::Draw(CPaintDC* dc)<br />
{<br />
   // declare/initialize brushes<br />
   CBrush  Brush;<br />
   CBrush* OldBrush;<br />
<br />
   Brush.CreateSolidBrush(RGB(0, 0, 0)); <br />
<br />
   // The docs say that this method returns a pointer to the previously CGDIObject<br />
   OldBrush = (CBrush*)dc->SelectObject(Brush); //OldBrush should be valid?<br />
<br />
   dc->Rectangle(1, 1, 100, 100);<br />
<br />
   // clean-up<br />
   dc.SelectObject(OldBrush);  //THIS IS WHERE IT CRASHES<br />
   Brush.DeleteObject();<br />
}