C / C++ / MFC

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//those 2 handle are obtained into main program<br />
HANDLE source=CreateFile("header", GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, NULL, NULL);<br />
HANDLE destination=CreateFile(filename_save, GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_ALWAYS, NULL, NULL);<br />
bool AppendToBeginOfFile(HANDLE source, HANDLE destination)<br />
{<br />
	DWORD source_size=0,<br />
		  destination_size=0,<br />
		  BRs=0,<br />
		  BRd=0,<br />
		  BW=0;<br />
	char *tmp1=NULL,<br />
		 *tmp2=NULL;<br />
	if((source == NULL) && (destination == NULL)) return false;<br />
	<br />
	source_size=GetFileSize(source, NULL);<br />
	destination_size=GetFileSize(destination, NULL);<br />
<br />
	tmp1=(char*)malloc(source_size*sizeof(char));<br />
	tmp2=(char*)malloc(destination_size*sizeof(char));<br />
<br />
	<br />
bool k=ReadFile(destination, tmp2, destination_size, &BRd, NULL);<br />
	DWORD l=GetLastError();<br />
	k=ReadFile(source, tmp1, source_size, &BRs, NULL);<br />
	l=GetLastError();<br />
	if((BRs < source_size) || (BRd < destination_size)) return false;<br />
<br />
	SetFilePointer(destination, 0 , 0 ,FILE_BEGIN);<br />
	WriteFile(destination, source, source_size, &BW, NULL);<br />
}<br />

CFile fileFrom,fileTo;
CString strFrom,strTo;

//get both paths


int nOpen = fileFrom.Open(strFileArray[uFile],CFile::modeRead|CFile::shareDenyWrite);
if(!nOpen)
  return;
unsigned long nLength = file.GetLength();
BYTE* pBytes = new BYTE[nLength];
if(!pBytes)
  return;
fileFrom.Read(pBytes,nLength);
fileFrom.Close();

if(fileTo.Open(strTo,CFile::modeCreate | CFile::modeWrite,&ex))
{
	fileTo.Write(pBytes,nLength);
	fileTo.Close();
}

delete [] pBytes;