Vector Load and Save

To add vector load and save functionality

Start with the project you created in Creating an Empty Vector Handle and Attaching it to a Window.

1. In the solution explorer view open the Resources Files then double click on tutorial.rc

2. Select IDC_TUTORIAL under the Menu

3. Modify the Menu structure to be as the following:

   IDR_MENU1 
   &File   
   &Open with ID = IDM_OPEN   
   &Save with ID = IDM_SAVE   
   E&xit with ID = IDM_EXIT 

4. Select File->Save All from the menu.

5. Edit the _tWinMain function and change the line:

   WndClass.lpszMenuName = NULL; 

   To:

   WndClass.lpszMenuName = MAKEINTRESOURCE( IDC_TUTORIAL); 

6. Add the following lines at the beginning of the tutorial.cpp file under #include "stdafx.h"

   #include <commdlg.h> 
   #include "C:\LEADTOOLS22\Include\ltdlg.h" 

7. Add these local variables under HDC hDC; in the WndProc function:

   static OPENFILENAME OpenFileName; 
   static L_TCHAR szFileName[ _MAX_PATH ]; 
   static L_TCHAR szFileTitle[ _MAX_PATH ]; 
   static L_TCHAR *szFilter[] = { TEXT("All Files\0*.*\0") }; 
   L_INT nRet; 

8. Add these lines right after ResetView( hWnd, &Vector ); in WM_CREATE handle:

   // reset the OPENFILENAME structure   
   memset( &OpenFileName, 0, sizeof( OPENFILENAME ) );   
   OpenFileName.lStructSize = sizeof( OPENFILENAME );   
   OpenFileName.hwndOwner = hWnd;   
   OpenFileName.lpstrFilter = szFilter[ 0 ];   
   OpenFileName.lpstrFile = szFileName;   
   OpenFileName.nMaxFile = _MAX_PATH;   
   OpenFileName.lpstrFileTitle = szFileTitle;   
   OpenFileName.nMaxFileTitle = _MAX_PATH; 

9. Modify the WM_COMMAND case in WndProc to be as the following:

   case WM_COMMAND: 
   wmId    = LOWORD(wParam); 
   wmEvent = HIWORD(wParam); 
   // Parse the menu selections: 
   switch (wmId) 
   { 
      case IDM_ABOUT: 
      DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, 
      About); 
      break; 
      case IDM_OPEN: 
      OpenFileName.Flags = OFN_HIDEREADONLY; 
      if( GetOpenFileName( &OpenFileName ) ) 
      { 
         // open the vector file 
         nRet = L_VecLoadFile ( szFileName, &Vector, NULL, 
         NULL ); 
         if( nRet != SUCCESS ) 
            MessageBox( hWnd, TEXT("Cannot open file!"), 
         TEXT("Error"), MB_ICONEXCLAMATION ); 
          
         GetClientRect( hWnd, &Rect ); 
         L_VecSetViewport ( &Vector, &Rect ); 
          
         ResetView( hWnd, &Vector ); 
      } 
      break; 
      case IDM_SAVE: 
      OpenFileName.Flags = OFN_HIDEREADONLY | 
      OFN_OVERWRITEPROMPT; 
      if( GetSaveFileName( &OpenFileName ) ) 
      { 
         // save the vector file 
         nRet = L_VecSaveFile ( szFileName, &Vector, FILE_DXF, 
         NULL ); 
         if( nRet != SUCCESS ) 
            MessageBox( hWnd, TEXT("Cannot save file!"), 
         TEXT("Error"), MB_ICONEXCLAMATION ); 
      } 
      break; 
      case IDM_EXIT: 
      DestroyWindow(hWnd); 
      break; 
   default: 
      return DefWindowProc(hWnd, message, wParam, lParam); 
   } 
   break; 

10. Modify the Imports.cpp file to be as the following:

    #include "stdafx.h" 
    #if defined(WIN64) 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\x64\\Ltvkrn_x.lib") 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\x64\\Ltkrn_x.lib") 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\x64\\Ltfil_x.lib") 
    #else 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\Win32\\Ltvkrn_u.lib") 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\Win32\\Ltkrn_u.lib") 
       #pragma comment( lib, "..\\..\\..\\..\\Lib\\CDLL\\Win32\\Ltfil_u.lib") 
    #endif 

11. Compile and run the project. You will be able to view, load and save vector files as you browse your local hard disk.