C / C++ / MFC

<br />
void FillBuffer(void)<br />
{<br />
	CString str;<br />
	<br />
	char Bit = 0;<br />
	char Byte = 0;<br />
	char Mask = 0;<br />
	char Buf = '0';<br />
<br />
<br />
	m_CardNumber.GetWindowTextA(str);<br />
	str.MakeUpper();<br />
	<br />
	for(int i = 0;i<sizeof(Card.Data);i++)<br />
	{<br />
		Card.Data[i] = 0x00; //make sure to clear buffer..<br />
	}<br />
<br />
	int MaxLength;<br />
<br />
	switch(PrevFormat)<br />
	{<br />
		case HEX: //Read in hex store in binary<br />
			{<br />
				MaxLength = 10;<br />
<br />
				if(str.GetLength() < 10)<br />
					MaxLength = str.GetLength();<br />
<br />
				for(int i = 0;<MaxLength;i++)<br />
				{<br />
					switch(str.GetAt(i))<br />
					{<br />
					case '0':<br />
						Mask = 0;<br />
						break;<br />
					case '1':<br />
						Mask = 1;<br />
						break;<br />
					case '2':<br />
						Mask = 2;<br />
						break;<br />
					case '3':<br />
						Mask = 3;<br />
						break;<br />
					case '4':<br />
						Mask = 4;<br />
						break;<br />
					case '5':<br />
						Mask = 5;<br />
						break;<br />
					case '6':<br />
						Mask = 6;<br />
						break;<br />
					case '7':<br />
						Mask = 7;<br />
						break;<br />
					case '8':<br />
						Mask = 8;<br />
						break;<br />
					case '9':<br />
						Mask = 9;<br />
						break;<br />
					case 'A':<br />
						Mask = 10;<br />
						break;<br />
					case 'B':<br />
						Mask = 11;<br />
						break;<br />
					case 'C':<br />
						Mask = 12;<br />
						break;<br />
					case 'D':<br />
						Mask = 13;<br />
						break;<br />
					case 'E':<br />
						Mask = 14;<br />
						break;<br />
					case 'F':<br />
						Mask = 15;<br />
						break;<br />
					};<br />
					if(Bit%2 == 0 || Bit == 0)<br />
					{<br />
						Mask = Mask << 4;<br />
					}<br />
					<br />
					Card.Data[Byte] = Card.Data[Byte]|Mask;<br />
			<br />
					Bit++;<br />
<br />
					if(Bit%2 == 0)<br />
					{<br />
						Byte++;<br />
					}<br />
<br />
<br />
				}<br />
				break; //Break HEX				<br />
			}<br />
		case BIN: // read binary string, store in binary buffer<br />
			{<br />
				MaxLength = 40;<br />
<br />
				if(str.GetLength() < 40)<br />
					MaxLength = str.GetLength();<br />
<br />
				for(int i = 0;i<MaxLength;i++)<br />
				{<br />
					Buf = str.GetAt(i);<br />
					Bit++;<br />
					<br />
					if(Buf == '1')<br />
					{<br />
						Mask = 1;<br />
						Mask = Mask << ((Bit % 8 > 0) ? ( 8 - (Bit % 8) ) : 0);<br />
						Card.Data[Byte] = Card.Data[Byte] | Mask;<br />
					}<br />
<br />
					if(Bit%8 == 0)<br />
					{<br />
						Byte++;<br />
					}<br />
				}<br />
				break; //Break BIN<br />
			}<br />
		case DEC:<br />
			{<br />
<br />
				//How to handle this?<br />
<br />
				break; //Break DEC<br />
			}<br />
                default:<br />
                                break;<br />
<br />
	};<br />
	<br />
<br />
}<br />
<br />

<br />
/*Copy strings*/<br />
#include "stdafx.h"<br />
#include <iostream><br />
using namespace std;<br />
<br />
/*Achieve via array*/<br />
void copy_array(char from[], char to[])<br />
{<br />
	int i = 0;<br />
	while(from[i] != '\0')<br />
	{<br />
		to[i] = from[i];<br />
		i++;		<br />
	}<br />
	to[i] = '\0';<br />
}<br />
<br />
/*Achieve via pointer*/<br />
void copy_pointer(char *from, char *to)<br />
{<br />
	while((*to++ = *from++) != '\0');<br />
}<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
	char *from = "c plus plus";<br />
	char *to = "oooooooooooooooo";<br />
	//copy_array(from, to);<br />
	copy_pointer(from, to);//Here: Test.exe Department of 0x00411536 unhandled exception: <br />
			   //0xC0000005: Write Access Violation occurs when the <br />
			   //position of 0x00417ac8,Why?	<br />
<br />
	cout << to << endl;<br />
<br />
	return 0;<br />
}<br />