L_TwainInitSession2

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainInitSession2(phSession, pAppData, uFlags)

Initializes the TWAIN session.

Returns

Comments

L_TwainInitSession2 (or L_TwainInitSession) must be called before calling any other LEADTOOLS TWAIN toolkit functions.

When the handle to the TWAIN session is no longer needed, free it by calling L_TwainEndSession. Every call to L_TwainInitSession2 requires a call to L_TwainEndSession when the session is no longer needed.

When passing LTWAIN_INIT_USE_THUNKSERVER to uFlags, it detects and interacts with a 32-bit TWAIN driver or device from a 64-bit process application.
Pass this value only when using a TWAIN device that does not have a 64-bit driver and the operating system is 64-bit. When using the THUNK server be sure to include in the distributables for the application all dependency files listed in the Using the LEADTOOLS THUNK Utility with TWAIN.

TWAIN Specification Support

LEADTOOLS TWAIN toolkits support both the TWAIN 1.9 and the TWAIN 2.x specifications. By default the toolkit will check whether the current selected TWAIN data source is TWAIN 2.x compliant and try to load the TWAIN 2.x DLL (TWAINDSM.DLL) if it exists in the system. The TWAIN version will be TWAIN_VERSION2".

If that fails or if the scanner is not compatible with TWAIN 2.x, the toolkit will try to start TWAIN 1.9 (Twain_32.DLL) from your system. The TWAIN version will be TWAIN_VERSION1".

You can also override the default behavior and explicitly set which version of TWAIN the selected device will use. To do so, call L_TwainSetVersion and pass “TWAIN_VERSION1” to use version 1.9, or “TWAIN_VERSION2” to use version 2.x. For more information, refer to Setting which TWAIN Specification Version to use and Managing the TWAIN Source.

Call L_TwainGetVersion to determine which TWAIN specification is currently being used by the LEADTOOLS TWAIN toolkit.                  

Required DLLs and Libraries

LTTWN
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files to be Included with your Application.

L_INT TwainInitSession2Example(HWND hWnd,HBITMAPLIST hBitmap) 
{ 
   L_INT nRet; 
   L_BOOL bAvailable; 
   HTWAINSESSION hSession = NULL; 
   APPLICATIONDATA AppData; 
   /* Check to see if TWAIN is installed */ 
   bAvailable = L_IsTwainAvailable(hWnd); 
   if (bAvailable) 
   { 
      AppData.hWnd = hWnd; 
      AppData.uStructSize = sizeof(APPLICATIONDATA); 
      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_TwainInitSession2(&hSession, &AppData, LTWAIN_INIT_MULTI_THREADED); 
      if (nRet != SUCCESS) 
         return nRet; 
      nRet = L_TwainAcquireList(hSession, hBitmap, NULL, LTWAIN_SHOW_USER_INTERFACE); 
      if(nRet != SUCCESS) 
         return nRet; 
      nRet = L_TwainEndSession(&hSession); 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
   return SUCCESS; 
}