Get a Fast Twain Scan from a Scanner

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

1.	Start Microsoft Visual Studio.
2.	Select the File->New menu option, click the "Project" menu.
3.	From "Project Types" select "Other Languages" to expand it, then select "Visual C++" to expand it, then select "MFC". From the right window select "MFC Application".
4.	In the Project Name dialog box, enter "TwainTutor2".
5.	In the Location dialog box, use the "Examples\ClassLibrary\MSVC" directory of your LEAD installation. For example, if you installed LEADTOOLS in "C:\LEADTOOLS 19\", enter "C:\LEADTOOLS 19\Examples\ClassLibrary\MSVC", then Click OK. Then click "Next".
6.	Choose "Dialog based" and click "Finish".
7.	Click on the "Solution Explorer" tab, and then click on the "TwainTutor2" project to expand it. Click on the Header files, then Open "TwainTutor2.h".
8.	Add the following line immediately before the class CTwainTutor2App declaration, (keep in mind, you may have to change the path to where the header files reside):

#include "..\..\..\..\include\ClassLib\ltwrappr.h"

9.	Click on the "Class View" tab.
10.	Click to open the "TwainTutor2" classes branch.
11.	Click "CTwainTutor2App", and then double click the CTwainTutor2App(void) constructor.
12.	Add the following lines after `//TODO: add construction code here`:

LBase::LoadLibraries(LT_ALL_LEADLIB);   
L_TCHAR * pszLicenseFile = L"Replace this with the path to the LEADTOOLS license file";   
L_TCHAR * pszDeveloperKey = L"Replace this with your developer key";   
LSettings::SetLicenseFile(pszLicenseFile, pszDeveloperKey);

13.	Create a new file called Imports.cpp in place it beside your project files.
	a.	In the Project Workspace, click the Solution Explorer tab.
	b.	Double-click the TwainTutor2 folder to open it.
	c.	Right-click the Source files folder and select Add New item.
	d.	Expand Visual C++ tree, if it is not already expanded.
	e.	Select Code from the sub tree.
	f.	Select C++ File (.cpp) from the right window.
	g.	In the name text box, specify Imports.cpp.
	h.	Click the Add button.
	i.	Double-click the imports.cpp in the solution Explorer and add the following lines:

#include "StdAfx.h"   
#if defined(WIN64)    
      
#else   
   #pragma comment(lib, "..\\..\\..\\..\\Lib\\CDLL\\Win32\\Ltwvc_u.lib")   
#endif // #if defined(WIN64)

14.	Click on the "Solution Explorer" tab.
15.	Double-click the "TwainTutor2" folder to open it.
16.	Double-click the "Header Files" folder to open it. Then double click "TwainTutor2Dlg.h" file to open it.
17.	Add the following class declaration before CTwainTutor2Dlg class.

class LMyTwain : public LTwain 
{ 
   LEAD_DECLAREOBJECT(LMyTwain); 
public: 
   LMyTwain(); 
   virtual ~LMyTwain(); 
   virtual L_INT BitmapCallBack(pBITMAPHANDLE pBitmap); 
};

18.	Click on the "Solution Explorer" tab.
19.	Double-click the "TwainTutor2" folder to open it.
20.	Double-click the "Source Files" folder to open it. Then double click "TwainTutor2Dlg.cpp" file to open it.
21.	Add the following class:

LEAD_IMPLEMENTOBJECT(LMyTwain); 
LMyTwain::LMyTwain() 
{ 
   EnableCallBack(TRUE); 
} 
LMyTwain::~LMyTwain() 
{ 
} 
L_INT LMyTwain::BitmapCallBack(pBITMAPHANDLE pBitmap) 
{ 
   //Copy the acquired bitmap here 
   return SUCCESS; 
}

22.	Click on the "Class View" tab.
23.	Right click "CTwainTutor2Dlg" and select Add "Add Variable..."
24.	For Variable Type enter LMyTwain, and for Variable Declaration put m_MyTwain. Leave Access as "Public" and click OK.
25.	Click to open the CTwainTutor2Dlg branch. Double click the OnInitDialog() function and add the following code after line:
	`//TODO: Add extra initialization here`

   APPLICATIONDATA AppData;    
   memset(&AppData, 0, sizeof(APPLICATIONDATA));    
   AppData.hWnd = m_hWnd;    
   AppData.uStructSize = sizeof(AppData);    
   lstrcpy(AppData.szManufacturerName, _T("LEAD Technologies, Inc."));    
   lstrcpy(AppData.szAppProductFamily, _T("LEAD Test Applications"));   
   lstrcpy(AppData.szVersionInfo, _T("Version 1.0"));   
   lstrcpy(AppData.szAppName, _T("TWAIN Test Application"));   
   m_MyTwain.InitSession(&AppData);

26.	Right click the CTwainTutor2Dlg branch, and choose "Properties".
27.	From the "Properties" window toolbar, click on the Messages icon.
	Then click on the empty area beside the item "WM_DESTROY" and choose OnDestroy.
28.	Add the following code after the opening bracket {:

   m_MyTwain.EndSession();   
   LBase::UnloadLibraries(LT_ALL_LEADLIB);

29.	Click on the "Class View" tab.
30.	Right click "CTwainTutor2Dlg" and select Add "Add Variable..."
31.	For Variable Type enter FASTCONFIG, and for Variable Declaration put m_BestConfig. Leave Access as "Public" and click OK.
32.	Click on the "Solution Explorer" tab.
33.	Double-click the "TwainTutor2" folder to open it.
34.	Double-click the "Resource Files" folder to open it. Then double click "TwainTutor2.rc" file to open it, then double click "Dialog", and then double click "IDD_TWAINTUTOR2_DIALOG"
35.	Now, drag and drop 3 buttons, and change their properties as follows:
		ID	Caption
	Button1	IDC_SELECT_SOURCE	Select Source
	Button2	IDC_FIND_FAST_CONFIG	Find Fast Config
	Button3	IDC_ACQUIRE_FAST_CONFIG	Acquire Fast Config
36.	From View menu, select "Other Windows" menu, then select "Resource View" menu, then select Dialog, and select "IDD_TWAINTUTOR2_DIALOG"
37.	Double click on "Select Source" button, and add the following code:

   m_MyTwain.SelectSource(NULL);

38.	From View menu, select "Other Windows" menu, then select "Resource View" menu, then select Dialog, and select "IDD_TWAINTUTOR2_DIALOG"
39.	Double click on "Find Fast Config" button, and add the following code:

   pFASTCONFIG pTestConfigs = NULL;    
   L_INT       nTestConfigsCount = 0;    
   L_INT       nRet;    
   nRet = m_MyTwain.FindFastConfig(TEXT("c:\\temp"),   
                                   LTWAIN_SHOW_USER_INTERFACE | LTWAIN_USE_THREAD_MODE,    
                                   8, 5, NULL, 0,    
                                   &pTestConfigs,    
                                   &nTestConfigsCount,    
                                   &m_BestConfig,    
                                   sizeof(FASTCONFIG));    
   if (nRet == SUCCESS)    
      AfxMessageBox(TEXT("Find Fast Configuration process completed"));   
   else   
      AfxMessageBox(TEXT("An error occurred during the Finding Fast Configuration process."));

40.	From View menu, select "Other Windows" menu, then select "Resource View" menu, then select Dialog, and select "IDD_TWAINTUTOR2_DIALOG"
41.	Double click on "Acquire Fast Config" button, and add the following code:

   L_INT nRet;    
   nRet = m_MyTwain.FastAcquire(TEXT("c:\\temp\\testconfig.tif"),   
                                 LTWAIN_SHOW_USER_INTERFACE | LTWAIN_USE_THREAD_MODE,    
                                 m_BestConfig.uTransferMode,    
                                 m_BestConfig.nFileFormat,    
                                 m_BestConfig.nBitsPerPixel,    
                                 TRUE,    
                                 m_BestConfig.ulBufferSize,    
                                 TRUE);    
   if (nRet == SUCCESS)    
      AfxMessageBox(TEXT("Image acquisition using the Fast TWAIN Configuration is completed."));    
   else   
      AfxMessageBox(TEXT("An error occurred while acquiring images using the Fast TWAIN Configuration."));

42.	Compile and test the program.

Help Version 19.0.2017.10.27

LEADTOOLS TWAIN C++ Class Library Help

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LEADTOOLS TWAIN Features

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