Get a Fast Twain Scan from a Scanner

Take the following steps to get fast twain scan using the LEADTOOLS Fast TWAIN features:

1.	Create a new directory in the LTWINxxx\EXAMPLES\DLL directory called EZTWN2.
2.	Copy everything in the EZFUNC directory into the EZTWN2 directory.
3.	Rename the EZFunc.c file to be EZFunc.cpp.
4.	Remove the EXFunc.cpp from the project and add the EZFunc.cpp in its place.
5.	Compile the project as it is and run EZFUNC32.exe to familiarize yourself with the basic program. You can run the exe file from the MS-DOS prompt, or set the image file to load through the Project->Settings->Debug->Program Arguments menu.
6.	On the Insert menu, select Files into Project. Add the lttw2_n.lib file to the project from the LTWINxxx\LIB directory.
7.	Define the following global variables in EZFUNC.CPP in the EZTWN directory:

HTWAINSESSION hSession = NULL;
FASTCONFIG BestConfig;

8.	In the project workspace go to the resources tab. Add a menu ("MAIN_MENU") to the application with the following menu items:
	ID	Caption
	IDM_SELECT_SOURCE	Select Source
	IDM_FIND_FAST_CONFIG	Find Fast Config
	IDM_ACQUIRE_FAST_CONFIG	Acquire Fast Config
9.	In the InitApplication function change the line:

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

to be

wcWindowClass.lpszMenuName = TEXT("MAIN_MENU");

10.	In the EZFunc.cpp add the following includes:

#include "resource.h"
#include "LTWINxxx\Include\ltTw2.h"

11.	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;

12.	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"));

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

L_TwainEndSession(&hSession);

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

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

15.	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;

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

case ID 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;

17.	Add the following definition in the top of the EZFunc.cpp file, and before any include statement:

#define USE_NEWTWAIN

18.	Compile and test the program.