National Instruments Image Acqusition Software NI-IMAQdx Manual De Usuario

© National Instruments Corporation

The following value types are compatible for any given attribute type.

The bolded compatible value type indicates the native value type. For 
example, use a 32-bit unsigned integer value type when dealing with a 
32-bit unsigned integer attribute type. Optionally, use a signed 64-bit 
integer, double precision floating point, or string when dealing with a 32-bit 
unsigned integer attribute type.

Each attribute has a read access and a write access. Use the Is Attribute 
Readable function to query read access for a given attribute. Use the Is 
Attribute Writable function to query write access for a given attribute. 
Some attributes are only settable before configuring the acquisition, while 
other attributes can be changed at any time.

Most attributes have a specific range of valid values. Use the Get Attribute 
Minimum, Get Attribute Maximum, and Get Attribute Increment 
functions to query the range of numeric attribute types. Use the Enumerate 
Attribute Values function to query the range of enumerated types. String, 
bool, and command attributes do not have a range.

Table 3-3.  Attribute Types and Compatible Value Types

U32

U32, I64, F64, String

I64

U32, I64, F64, String

F64

U32, I64, F64, String

String

Enum

U32, I64, F64, String, EnumItem

Bool

U32, I64, F64, String, Bool

Command

U32, I64, F64, String, Bool