C / C++ / MFC

<br />
CFile(LPCTSTR lpszFileName, UINT nOpenFlags);<br />

<br />
CFile f;<br />
CFileException e;<br />
char* pFileName = "test.dat";<br />
if( !f.Open( pFileName, CFile::modeCreate | CFile::modeWrite, &e ) )<br />
   {<br />
#ifdef _DEBUG<br />
   afxDump << "File could not be opened " << e.m_cause << "\n";<br />
#endif<br />
   }<br />
<br />
//A second example for CFile::Open.<br />
//This console program uses CFile to copy binary files.<br />
<br />
#include <afx.h><br />
#include <afxwin.h><br />
#include <iostream><br />
<br />
using namespace std;<br />
<br />
CWinApp theApp;<br />
<br />
int main(int argc, char *argv[])<br />
{<br />
   if (!AfxWinInit(GetModuleHandle(NULL), NULL, GetCommandLine(), 0))<br />
   {<br />
      cout << "panic: MFC couldn't initialize!" << endl;<br />
      return 1;<br />
   }<br />
<br />
   // constructing these file objects doesn't open them<br />
<br />
   CFile sourceFile;<br />
   CFile destFile;<br />
<br />
   // see that we have a reasonable number of arguments<br />
<br />
   if (argc != 3)<br />
   {<br />
      cout << "usage: " << argv[0];<br />
      cout << " <source> <dest>" << endl;<br />
      cout << endl;<br />
      return 1;<br />
   }<br />
<br />
   // we'll use a CFileException object to get error information<br />
<br />
   CFileException ex;<br />
<br />
   // open the source file for reading<br />
<br />
   if (!sourceFile.Open(argv[1],<br />
      CFile::modeRead | CFile::shareDenyWrite, &ex))<br />
   {<br />
      // complain if an error happened<br />
      // no need to delete the ex object<br />
<br />
      TCHAR szError[1024];<br />
      ex.GetErrorMessage(szError, 1024);<br />
      cout << "Couldn't open source file: ";<br />
      cout << szError;<br />
      return 1;<br />
   }<br />
   else<br />
   {<br />
      if (!destFile.Open(argv[2], CFile::modeWrite |<br />
            CFile::shareExclusive | CFile::modeCreate, &ex))<br />
      {<br />
         TCHAR szError[1024];<br />
         ex.GetErrorMessage(szError, 1024);<br />
         cout << "Couldn't open source file: ";<br />
         cout << szError;<br />
<br />
         sourceFile.Close();<br />
         return 1;<br />
      }<br />
<br />
      BYTE buffer[4096];<br />
      DWORD dwRead;<br />
<br />
      // Read in 4096-byte blocks,<br />
      // remember how many bytes were actually read,<br />
      // and try to write that many out. This loop ends<br />
      // when there are no more bytes to read.<br />
<br />
      do<br />
      {<br />
         dwRead = sourceFile.Read(buffer, 4096);<br />
         destFile.Write(buffer, dwRead);<br />
      }<br />
      while (dwRead > 0);<br />
<br />
      // Close both files<br />
<br />
      destFile.Close();<br />
      sourceFile.Close();<br />
   }<br />
<br />
   return 0;<br />
}<br />

P Gibson wrote:

Any recommendations as to what to use, or any examples available would be most appreciated.

P Gibson wrote:

so some source code for comparing is required that is fast (and accurate) as some files maybe more than 5MB in size, but usually will be several hundred KB.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

nripun wrote:

When i check marked the Numbers in the Edit Box properties only +ve integers could be entered.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

<br />
template < typename   T > class DataList<br />
{<br />
 public:<br />
AddNode(const T val) // Input data must be read only<br />
{<br />
  // some codes<br />
  // val="v";<br />
}<br />
  // some more functions<br />
};<br />
<br />
<br />
IN Main function <br />
<br />
LPCSTR str = "Hello";  // Const char string<br />
DataList< char *> data; // Data list for char strings<br />
data.AddNode((char*)str);     // Add the string<br />

template < typename   T > class DataList<br />
{<br />
public:<br />
AddNode(const T val)  // Input data must be read only<br />
{<br />
  // some codes<br />
*val='a';<br />
}<br />
// some more functions<br />
};<br />
<br />
<br />
In Main function <br />
<br />
LPCSTR str = "Hello";  // Const char string<br />
DataList<const char *> data; // Data list for char strings<br />
data.AddNode(str);   <br />

LPSTR str = "Hello"; // Const char string       <br />
str[1] = 'a';