Get a Fast Twain Scan from a Scanner

Note: The purpose of this TWAIN tutorial is to provide you a quick and easy way to generate a TWAIN program. For more in depth TWAIN programming, refer to the TWAIN demo.

To acquire a FAST TWAIN scan using LEADTOOLS:

1.	Create a new directory in the \Examples\CDLL directory called TwainTutorial2
2.	Copy everything in the SimpleLoad directory into the TwainTutorial2 directory.
3.	Compile the project as it is and run SimpleLoad.exe to familiarize yourself with the basic program.
4.	In the Imports.cpp, add the following lines:

#if defined(WIN64)

…

#else

…

#pragma comment(lib, "..\\..\\..\\Lib"L_VER_DESIGNATOR"\\CDLL\\Win32\\Lttwn_u.lib")

#endif // #if defined(WIN64)

5.	Add the following line in StdAfx.h in the TwainTutorial2 directory:

#include "..\..\..\include\lttwn.h"

6.	Define the following global variables in Ezfunc.h in the TwainTutorial2 directory:

HTWAINSESSION hSession;
FASTCONFIG BestConfig;

Also, add the following defines:

#define IDM_SELECT_SOURCE 200

#define IDM_FIND_FAST_CONFIG 201

#define IDM_ACQUIRE_FAST_CONFIG 202

7.	Edit EZFUNC.RC file in the TwainTutorial directory and add the following lines:

#include "EZFUNC.H"

MAIN_MENU MENU

BEGIN

MENUITEM "Select Source" IDM_SELECT_SOURCE

MENUITEM "Find Fast Config" IDM_FIND_FAST_CONFIG

MENUITEM "Acquire Fast Config" IDM_ACQUIRE_FAST_CONFIG

END

8.	In the InitApplication function change the line:

wcWindowClass.lpszMenuName = NULL; /* No menu */

to be

wcWindowClass.lpszMenuName = TEXT("MAIN_MENU");

9.	In the MainWndProc function and before the handling of the WM_PALETTECHANGED message add the following code:

   case WM_COMMAND:
      {
         switch (LOWORD(wParam))
         {
         case IDM_SELECT_SOURCE:
            {
            }
            break;
         case IDM_FIND_FAST_CONFIG:
            {
            }
            break;
         case IDM_ACQUIRE_FAST_CONFIG:
            {
            }
            break;
         }
      }
      break;

10.	In the WM_CREATE message handler add the following code at the end of it (after SendMessage (hWnd, WM_QUERYNEWPALETTE, 0, 0L);):

APPLICATIONDATA AppData;
AppData.uStructSize = sizeof(APPLICATIONDATA);
AppData.hWnd = hWnd;
lstrcpy (AppData.szManufacturerName, TEXT("LEAD Technologies, Inc."));
lstrcpy (AppData.szAppProductFamily, TEXT("LEAD Test Applications"));
lstrcpy (AppData.szVersionInfo, TEXT("Version 1.0"));
lstrcpy (AppData.szAppName, TEXT("TWAIN Test Application"));
nRet = L_TwainInitSession(&hSession, &AppData);
if (nRet != SUCCESS)
return FALSE;

/* Unlock Document support.
Note that this is a sample key, which will not work in your toolkit. */
L_UnlockSupport(L_SUPPORT_DOCUMENT, TEXT("TestKey"));

11.	In the WM_DESTROY message handler add the following code at the end of it (before the PostQuitMessage (0);):

L_TwainEndSession(&hSession);

12.	In the IDM_SELECT_SOURCE menu handler add the following code:

case IDM_SELECT_SOURCE:
   {
      nRet = L_TwainSelectSource(hSession, NULL);
   }
   break;

13.	In the IDM_FIND_FAST_CONFIG menu handler add the following code:

case IDM_FIND_FAST_CONFIG:
   {
      pFASTCONFIG pTestConfigs = NULL;
      L_INT       nTestConfigsCount = 0;

      nRet = L_TwainFindFastConfig(hSession,
                                   TEXT("c:\\temp"),
                                   LTWAIN_SHOW_USER_INTERFACE | LTWAIN_USE_THREAD_MODE,
                                   8, 5, NULL, 0,
                                   &pTestConfigs,
                                   &nTestConfigsCount,
                                   &BestConfig,
                                  sizeof(FASTCONFIG),
                                   NULL,
                                   NULL);
      if (nRet == SUCCESS)
         MessageBox(hWnd, TEXT("Find Fast Configuration process completed"), TEXT("Fast Config"), MB_OK);
      else
         MessageBox(hWnd, TEXT("An error occurred during the Finding Fast Configuration process."), TEXT("Fast Config"), MB_OK);
   }
   break;

14.	In the IDM_ACQUIRE_FAST_CONFIG menu handler add the following code:

case IDM_ACQUIRE_FAST_CONFIG:
   {
      nRet = L_TwainAcquireMulti(hSession,
                                 TEXT("c:\\temp\\testconfig.tif"),
                                 LTWAIN_SHOW_USER_INTERFACE | LTWAIN_USE_THREAD_MODE,
                                 BestConfig.uTransferMode,
                                 BestConfig.nFileFormat,
                                 BestConfig.nBitsPerPixel,
                                 TRUE,
                                 BestConfig.ulBufferSize,
                                 TRUE,
                                 NULL,
                                 NULL);
      if (nRet == SUCCESS)
         MessageBox(hWnd, TEXT("Image acquisition using the Fast TWAIN Configuration is completed."), TEXT("Fast Config"), MB_OK);
      else
         MessageBox(hWnd, TEXT("An error occurred while acquiring images using the Fast TWAIN Configuration."), TEXT("Fast Config"), MB_OK);
   }
   break;

15.	Compile and test the program.