Re: How to select a lot of files

"Drew" <dam@dam.com> ha scritto nel messaggio
news:u5tE23L0IHA.2084@TK2MSFTNGP06.phx.gbl...


Hi,

I found an old post I wrote in this newsgroup, with a sample code that may
interest you:

[subject] CFileDialog failure
[date] 2007, October 19th

<code>

//------------------------------------------------------------------
// Given the file list from Open file dialog in multi-select mode,
// parses it and prints its content to the user.
//------------------------------------------------------------------
void CTestDlg::ProcessFileList( LPCTSTR fileList )
{
   ASSERT( fileList != NULL );

   //
   // Parse file list from CFileDialog,
   // and build a string list from it
   //
   LPCTSTR pstr = fileList;
   std::vector< CString > strings;
   while ( true )
   {
       if ( *pstr == _T('\0') && *(pstr+1) == _T('\0') )
       {
           break;
       }

       // Ciao 0
       // 1234 5
       // *
       // 0123 4
       strings.push_back( CString(pstr) );
       pstr += (_tcslen(pstr) + 1);
   }

   //
   // Build a message with the file names
   //
   CString msg;
   msg = _T("*** Selected files ***\n\n");
   msg += _T("Path : ") + strings.at(0); // First string is path name
   msg += _T("\n\n");
   for ( size_t i = 1; i < strings.size(); i++ )
   {
       msg += strings.at(i);
       msg += _T("\n");
   }
   AfxMessageBox( msg );

}

//------------------------------------------------------------------
// Tests Open file dialog in multi-select mode.
//------------------------------------------------------------------
void CTestDlg::OnBnClickedButton1()
{
   // Max files in list (including folder path)
   const int MaxFileCount = 50;

   // Max TCHARs per file
   const int MaxFilePath = MAX_PATH;

   // Calculate approx size for the given number of max files.
   // The "+1" is for the terminating NUL (_T('\0')) character.
   const int MaxFileBuffer = MaxFileCount * MaxFilePath + 1;
// const int MaxFileBuffer = 30; // TEST for small buffer

   // Buffer for file names
   std::vector< TCHAR > fileNamesBuffer(MaxFileBuffer);

   // File dialog object, dynamically allocated
   // at each loop iteration
   CFileDialog * fileDlg = NULL;
   while ( true )
   {
       // Allocate a new file dialog object
       ASSERT( fileDlg == NULL );
       fileDlg = new CFileDialog(
           TRUE, // Open file dialog
           NULL, // No default extension
           NULL, // Initial file name
           OFN_HIDEREADONLY | OFN_ALLOWMULTISELECT,
           _T("All files (*.*)|*.*||"), // Filter
           this // Parent
       );

       // Hook our buffer to file dialog structure
       fileDlg->GetOFN().lpstrFile = &(fileNamesBuffer[0]);
       fileDlg->GetOFN().nMaxFile = (DWORD) fileNamesBuffer.size();

       // Clear buffer content, so we don't see garbage
       // from the previous iteration
       // (if the previous iteration failed).
       ::ZeroMemory( &(fileNamesBuffer[0]),
           fileNamesBuffer.size() * sizeof(TCHAR) );

       // Run the dialog-box
       INT_PTR result = fileDlg->DoModal();

       // Avoid memory leaks
       delete fileDlg;
       fileDlg = NULL;

       // Check result
       if ( result == IDCANCEL )
       {
           // Failure or user pressed Cancel?
           DWORD dw = ::CommDlgExtendedError();
           if ( dw & FNERR_BUFFERTOOSMALL )
           {
               // Failure due to few buffer memory;
               // tell that to the user
               AfxMessageBox( _T("Too many files selected.") );

               // Do another iteration
               continue;
           }

           // User pressed cancel, or other error.
           // Quit loop.
           break;
       }

       // User pressed OK:
       // Show selected files and quit loop.
       ProcessFileList( &(fileNamesBuffer[0]) );
       break;
   }

}

</code>

HTH,
Giovanni