LWia::IsAvailable

#include "ltwrappr.h"

virtual L_BOOL LWia::IsAvailable(uWiaVersion)

L_UINT uWiaVersion;

WIA version you wish to use

Determines whether a WIA source is installed.

Parameter	Description
uWiaVersion	The WIA version to be used. Possible values are:
	Value	Meaning
	WiaVersion1	[1] Use WIA version 1.
	WiaVersion2	[2] Use WIA version 2.

Returns

TRUE	At least one WIA source is installed.
FALSE	No WIA source is installed.

Comments

This feature is available in LEADTOOLS version 16 or higher.

Use this function when deciding whether to enable or disable WIA menu items.

Required DLLs and Libraries

LTWIA

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

class CMyWIA : public LWia 
{ 
public: 
   L_INT AcquireCallBack(pBITMAPHANDLE pBitmap, L_TCHAR * pszFilename, L_UINT32 uPercent, L_UINT32 uFlags); 
}; 
L_INT CMyWIA::AcquireCallBack(pBITMAPHANDLE pBitmap, L_TCHAR * pszFilename, L_UINT32 uPercent, L_UINT32 uFlags) 
{ 
   UNREFERENCED_PARAMETER(pBitmap); 
   UNREFERENCED_PARAMETER(pszFilename); 
   UNREFERENCED_PARAMETER(uPercent); 
   UNREFERENCED_PARAMETER(uFlags); 
   // You can do here any processing to the bitmap 
   return WIA_SUCCESS; 
} 
L_INT LWIA__IsAvailableExample(L_UINT uWiaVersion) 
{ 
   CMyWIA               MyClass; 
   LWIAACQUIREOPTIONS   AcquireOpts; 
   L_BOOL               bAvailable; 
   L_INT                nRet; 
   /* Check to see if user passed WIA version is installed */ 
   bAvailable = MyClass.IsAvailable(uWiaVersion); 
   if (bAvailable) 
   { 
      nRet = MyClass.InitSession(uWiaVersion); 
      if (nRet != SUCCESS) 
         return nRet; 
      nRet = MyClass.SelectDeviceDlg(WiaDeviceTypeDefault, L_WIA_SELECT_DEVICE_NODEFAULT); 
      if (nRet != SUCCESS) 
         return nRet; 
      /* Initialize and fill the required fields from the LWIAACQUIREOPTIONS structure */ 
      memset(&AcquireOpts, 0, sizeof(LWIAACQUIREOPTIONS)); 
      AcquireOpts.uStructSize = sizeof(LWIAACQUIREOPTIONS); 
      AcquireOpts.uMemBufSize = 64 * 1024; 
      AcquireOpts.bDoubleBuffer = TRUE; 
      MyClass.EnableCallBack (TRUE); 
      nRet = MyClass.Acquire(L_WIA_DEVICE_DIALOG_USE_COMMON_UI, 
      &AcquireOpts, 
      NULL, 
      NULL, 
      NULL); 
      if (nRet != SUCCESS) 
         return nRet; 
      nRet = MyClass.EndSession(); 
      if (nRet != SUCCESS) 
         return nRet; 
   } 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

LEADTOOLS WIA C++ Class Library Help

Introduction

Version History

Getting Started

Files To Be Included With Your Application

Quick Reference

Tutorials

Classes and Function References

Functions:	LWia::Acquire, LWia::AcquireToFile, LWia::AcquireSimple, Class Members
Topics:	Programming with LEADTOOLS Windows Image Acquisition (WIA) Functions
	WIA Functionality: Property Functions