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):

Value Meaning
TWON_ONEVALUE The container is of type TW_ONEVALUE and only the pltwOneValue pointer is used.
TWON_RANGE The container is of type TW_RANGE and only the pltwRange pointer is used.
TWON_ONEVALUE The container is of type TW_ENUMERATION and only the pltwEnumeration pointer is used.
TWON_ONEVALUE The container is of type TW_ARRAY and only the pltwArray pointer is used.

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.

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LEADTOOLS TWAIN C++ Class Library Help

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© 1991-2021 LEAD Technologies, Inc. All Rights Reserved.