LTWAINPROPERTYQUERY

typedef struct _LTWAINPROPERTYQUERY 
{ 
   L_UINT uStructSize; 
   L_UINT uType; 
   union 
   { 
      pTW_ONEVALUE pltwOneValue; 
      pTW_RANGE pltwRange; 
      pTW_ENUMERATION pltwEnumeration; 
      pTW_ARRAY pltwArray; 
   }; 
} LTWAINPROPERTYQUERY,  * pLTWAINPROPERTYQUERY; 

The LTWAINPROPERTYQUERY structure provides information about the capability properties.

Members

L_UINT uStructSize

Size of the LTWAINPROPERTYQUERY structure, in bytes, for versioning. Use the sizeof() operator to calculate the value.

L_UINT uType

Holds the type of pointer to use from the union. Possible values are (according to the TWAIN specification):

pltwOneValue

Pointer to a TW_ONEVALUE structure.

pltwRange

Pointer to a TW_RANGE structure.

pltwEnumeration

Pointer to a TW_ENUMERATION structure.

pltwArray

Pointer to a TW_ARRAY structure.

Comments

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

LTWAINPROPERTIES is allocated by the LTwain::QueryProperty function and freed by LTwain::FreePropQueryStructure function.