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\API 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\\API\\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. |