Struct x11rb::protocol::xproto::GetPropertyReply

source ·

pub struct GetPropertyReply {
    pub format: u8,
    pub sequence: u16,
    pub length: u32,
    pub type_: u32,
    pub bytes_after: u32,
    pub value_len: u32,
    pub value: Vec<u8>,
}

Expand description

Fields

format - Specifies whether the data should be viewed as a list of 8-bit, 16-bit, or 32-bit quantities. Possible values are 8, 16, and 32. This information allows the X server to correctly perform byte-swap operations as necessary.
type - The actual type of the property (an atom).
bytes_after - The number of bytes remaining to be read in the property if a partial read was performed.
value_len - The length of value. You should use the corresponding accessor instead of this field.

Fields§

§format: u8§sequence: u16§length: u32§type_: u32§bytes_after: u32§value_len: u32§value: Vec<u8>

Implementations§

source §

impl GetPropertyReply

source

pub fn value8(&self) -> Option<impl Iterator<Item = u8>>

Iterate over the contained value if its format is 8.

This function checks if the format member of the reply is 8. If it it is not, None is returned. Otherwise and iterator is returned that interprets the value in this reply as type u8.

Examples

Successfully iterate over the value:

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 8,
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 2, 3, 4],
};

// This is the actual example: Iterate over the value.
let mut iter = reply.value8().unwrap();
assert_eq!(iter.next(), Some(1));
assert_eq!(iter.next(), Some(2));
assert_eq!(iter.next(), Some(3));
assert_eq!(iter.next(), Some(4));
assert_eq!(iter.next(), None);

An iterator is only returned when the format is correct. The following example shows this.

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 42, // Not allowed in X11, but used for the example
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 2, 3, 4],
};
assert!(reply.value8().is_none());

source

pub fn value16(&self) -> Option<impl Iterator<Item = u16>>

Iterate over the contained value if its format is 16.

This function checks if the format member of the reply is 16. If it it is not, None is returned. Otherwise and iterator is returned that interprets the value in this reply as type u16.

Examples

Successfully iterate over the value:

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 16,
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 1, 2, 2],
};

// This is the actual example: Iterate over the value.
let mut iter = reply.value16().unwrap();
assert_eq!(iter.next(), Some(257));
assert_eq!(iter.next(), Some(514));
assert_eq!(iter.next(), None);

An iterator is only returned when the format is correct. The following example shows this.

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 42, // Not allowed in X11, but used for the example
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 2, 3, 4],
};
assert!(reply.value16().is_none());

source

pub fn value32(&self) -> Option<impl Iterator<Item = u32>>

Iterate over the contained value if its format is 32.

This function checks if the format member of the reply is 32. If it it is not, None is returned. Otherwise and iterator is returned that interprets the value in this reply as type u32.

Examples

Successfully iterate over the value:

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 32,
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 2, 2, 1],
};

// This is the actual example: Iterate over the value.
let mut iter = reply.value32().unwrap();
assert_eq!(iter.next(), Some(16908801));
assert_eq!(iter.next(), None);

An iterator is only returned when the format is correct. The following example shows this.

// First, we have to 'invent' a GetPropertyReply.
let reply = x11rb_protocol::protocol::xproto::GetPropertyReply {
    format: 42, // Not allowed in X11, but used for the example
    sequence: 0,
    length: 0, // This value is incorrect
    type_: 0, // This value is incorrect
    bytes_after: 0,
    value_len: 4,
    value: vec![1, 2, 3, 4],
};
assert!(reply.value32().is_none());