L_TwainGetCapability

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainGetCapability (hSession, pCapability, uFlags)

HTWAINSESSION hSession;	/* handle to an existing TWAIN session */
pTW_CAPABILITY pCapability;	/* pointer to a structure */
L_UINT uFlags;	/* optional flags */

Gets the specified capability value(s).

Parameter	Description
hSession	Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession function.
pCapability	Pointer to a TW_CAPABILITY structure that references the required capability. This structure must be allocated and it will be filled with data corresponding to the required capability to get.
uFlags	Flags that indicate the capability values to get. Possible values are:
	Value	Meaning
	LTWAIN_CAPABILITY_GETCURRENT	[3] Get the current value.
	LTWAIN_CAPABILITY_GETDEFAULT	[4] Get the default value.
	LTWAIN_CAPABILITY_GETVALUES	[5] Get all available values.

Returns

SUCCESS	The function was successful.
! = SUCCESS	An error occurred. Refer to Return Codes.

Comments

This function must be called after L_TwainStartCapsNeg is called and before L_TwainEndCapsNeg is called.

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.

See Also

Function:	L_TwainStartCapsNeg, L_TwainEndCapsNeg, L_TwainSetProperties, L_TwainGetProperties, L_TwainSetCapability, L_TwainInitSession, L_TwainEndSession.
Topics:	Getting and Setting Capabilities
	TWAIN Functionality: Capability Functions.

Example

 L_INT TwainGetCapabilityExample(HTWAINSESSION g_hSession)
{
   L_INT nRet;
   TW_CAPABILITY twCap;
   // Fill the TW_CAPABILITY structure with values
   twCap.Cap = ICAP_XFERMECH;
   twCap.ConType = TWON_DONTCARE16;
   nRet = L_TwainGetCapability (g_hSession, &twCap, LTWAIN_CAPABILITY_GETCURRENT);
   if (nRet != SUCCESS) 
   {
      MessageBox (NULL, TEXT("Failed to get capability"), TEXT("ERROR"), MB_OK);
      return nRet;
   }
   nRet = L_TwainFreeContainer(&twCap);
   if(nRet != SUCCESS)
      return nRet;
  
   return SUCCESS;
}