typedef struct _LTWAINPROPERTIES 
   L_UINT uStructSize; 
   L_BOOL bPaperSource; 
   L_INT nMaxNumOfPages; 
   L_INT nDuplexScanning; 
   DATATRANSFER DataTransfer; 

The LTWAINPROPERTIES structure provides information about the available TWAIN properties.

Member Description
uStructSize Size of this structure in bytes, for versioning. Use the sizeof() macro to calculate this value.
bPaperSource Flag that indicates whether to use the Auto - Feed capability of the selected TWAIN source. Possible values are:
  Value Meaning
  TRUE Use the Auto - Feed capability.
  FALSE Do not use the Auto - Feed capability.
nMaxNumOfPages The maximum number of pages to get from the TWAIN source. (If the function updates this field to -1, it means that the number of pages is unlimited.)
nDuplexScanning (Read only) Gets the type of duplex scanning. Possible values are (according to the TWAIN 1.9 specification):
  Value Meaning
  TWDX_NONE No duplex used.
  TWDX_1PASSDUPLEX 1 pass duplex.
  TWDX_2PASSDUPLEX 2 pass duplex.
ImageRes A structure of type IMAGERESOLUTION that contains image resolution data for the TWAIN source.
DataTransfer A structure of type DATATRANSFER that contains data transfer information for the TWAIN source.
ImageEff A structure of type IMAGEEFFECTS that contains image effects information for the TWAIN source.


pLTWAINPROPERTIES is a pointer to an LTWAINPROPERTIES structure. Where the function parameter type is pLTWAINPROPERTIES, you can declare an LTWAINPROPERTIES variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pLTWAINPROPERTIES variable is necessary only if your program requires a pointer.

LTWAINPROPERTIES is used with the L_TwainGetProperties and L_TwainSetProperties functions.

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