CType 编辑

All data types declared using the js-ctypes API are represented by CType objects. These objects have assorted methods and properties that let you create objects of these types, find out information about them, and so forth. The specific properties and methods on each object vary depending on the data type represented.

There are several kinds of types:

Primitive types

These are typical unstructured data, such as the predefined types listed in Predefined data types.

Big integer types

The Int64 and UInt64 types provide access to 64-bit integer values, which JavaScript doesn't currently support.

PointerType

These represent pointers to data in memory.

FunctionType

These represent callable C functions.

StructType

These represent C structures.

ArrayType

These represent C arrays.

Method overview

Methods available on all CType objects

Properties

Properties of all CType objects

These properties are available on all CType objects.

Methods available on all CType objects

array()

Returns a new CType representing an array of elements of the type on which it was called.

CType array(
  [n]
};

Parameters

n Optional

The number of elements in the declared array type. If this parameter is left out, the array's size is indeterminate.

Return value

A CType representing the data type "array of this type". This is the same as calling ctypes.ArrayType(the_type[, n]).

toSource()

Returns a JavaScript expression that evaluates to a CType describing the same C type as this object.

String toSource();

Parameters

None.

Return value

A JavaScript expression that evaluates to a CType describing the same C type as this object.

Example

ctypes.uint32_t.toSource() returns "ctypes.uint32_t".

toString()

Returns a string identifying the type. The format of this string is "type " + name.

String toString();

Parameters

None.

Return value

A string identifying the data type.

See Also

• ArrayType
• FunctionType
• PointerType
• StructType
• Type conversion