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LTwain::IsAvailable

Summary

Determines whether a TWAIN source is installed.

Syntax

#include "ltwrappr.h"

virtual L_BOOL LTwain::IsAvailable()

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 LTwain__IsAvailableExample(HWND hWnd, HBITMAPLIST hBitmap) 
 
{ 
   L_BOOL            bAvailable; 
   L_INT             nRet; 
   LTwain            MyClass; 
   APPLICATIONDATA   AppData; 
 
   /* Check to see if TWAIN is installed */ 
 
   bAvailable = MyClass.IsAvailable(); 
 
   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")); 
      AppData.uLanguage = TWLG_ENGLISH_USA; 
      AppData.uCountry = TWCY_USA; 
      nRet = MyClass.InitSession(&AppData);  
 
      if (nRet != SUCCESS)  
 
         return nRet; 
 
      nRet = MyClass.AcquireList(hBitmap, NULL, LTWAIN_SHOW_USER_INTERFACE); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      nRet = MyClass.EndSession(); 
      if(nRet != SUCCESS) 
         return nRet; 
 
   } 
 
   return SUCCESS; 
}