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L_IsTwainAvailable

Summary

Determines whether a TWAIN source is installed.

Syntax

#include "lttwn.h"

L_LTTWN_API L_BOOL L_IsTwainAvailable(hWnd)

Parameters

HWND hWnd

Handle to a window. (Internal TWAIN functions require a window handle; any valid window handle will work in this case.)

Returns

Value	Meaning
TRUE	At least one TWAIN source is installed.
FALSE	No TWAIN source is installed.

Comments

You can use this function when deciding whether to enable or disable TWAIN menu items.

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.

Example

L_INT IsTwainAvailableExample(HWND hWnd,HBITMAPLIST hBitmap) 
{ 
   L_BOOL bAvailable; 
   L_INT nRet; 
   HTWAINSESSION hSession = NULL; 
   APPLICATIONDATA AppData; 
 
   /* Check to see if TWAIN is installed */ 
   bAvailable = L_IsTwainAvailable(hWnd); 
   if (bAvailable) 
   { 
      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")); 
      AppData.uLanguage = TWLG_ENGLISH_USA; 
      AppData.uCountry  = TWCY_USA; 
      nRet = L_TwainInitSession(&hSession, &AppData); 
      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; 
}