PointerType 编辑
PointerType represents C pointer.
Syntax
Returns a new CType object describing a new pointer data type.
CType PointerType( type );
Parameters
type- Specifies the type to which the pointer type points. This can be any
CTypeobject to declare the new type as a pointer to that type.
Return value
A CType object describing the newly created data type.
Exceptions thrown
Examples
Creating a type "pointer to 32-bit integer" looks like this:
var intPtrType = new ctypes.PointerType(ctypes.int32_t);
Properties
| Property | Type | Description |
targetType | CType | The type of object the pointer points to. Read only. |
Properties inherited from CType
These properties are available on all CType objects.
| Property | Type | Description |
name | String | The type's name. Read only. For primitive types, this is just the name of the corresponding C type. For structure and opaque pointer types, this is simply the string that was passed to the constructor. For other function, pointer, and array types, this should be a valid C type expression. |
ptr | CType | Returns a CType representing the data type "pointer to this type". This is the result of calling ctypes.PointerType(the_type). Read only. |
size | Number | The size of the type, in bytes. This is the same value as the C ctypes.void_t.size is undefined. |
Method overview
Methods inherited from CType
CType array([n]) |
String toSource() |
String toString() |
PointerType CData Syntax
CData pointertype();
pointertype is PointerType CType.Return value
A CData representing the newly allocated pointer.
PointerType CData Properties
| Property | Type | Description |
contents | CData | Reading this property returns a CData object referring to the pointed-to contents of the object. Writing to this value writes the C conversion of the data into the pointed-to memory. If converting the data fails, a TypeError exception is thrown. |
Properties inherited from CData
| Property | Type | Description |
constructor | CType | The data type of the ctypes.void_t or an array type with an unspecified length. |
value | object | The JavaScript equivalent of the CData object's value. This will throw a TypeError exception if the value can't be converted. |
PointerType CData Method_overview
bool isNull() |
Methods inherited from CData
|
String toSource() |
String toString() |
PointerType CData Methods
isNull()
Determines whether or not the pointer's value is null.
bool isNull();
Parameters
None.
Return value
true if the pointer's value is null, otherwise false.
See Also
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