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 ander #include "stdafx.h"

#include <commdlg.h> 
#include "C:\LEADTOOLS 19\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\\Lvkrn_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\\Lvkrn_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.

Help Version 19.0.2017.10.27

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LEADTOOLS Vector C API Help

Introduction

Version History

LEADTOOLS Vector Features

Redistributables/Files To Be Included With Your Application