Struct GetPropertyRequest

pub struct GetPropertyRequest {
    pub delete: bool,
    pub window: u32,
    pub property: u32,
    pub type_: u32,
    pub long_offset: u32,
    pub long_length: u32,
}

Gets a window property.

Gets the specified property from the specified window. Properties are for example the window title (WM_NAME) or its minimum size (WM_NORMAL_HINTS). Protocols such as EWMH also use properties - for example EWMH defines the window title, encoded as UTF-8 string, in the _NET_WM_NAME property.

TODO: talk about type

TODO: talk about delete

TODO: talk about the offset/length thing. what’s a valid use case?

Fields

• window - The window whose property you want to get.
• delete - Whether the property should actually be deleted. For deleting a property, the specified type has to match the actual property type.
• property - The property you want to get (an atom).
• type - The type of the property you want to get (an atom).
• long_offset - Specifies the offset (in 32-bit multiples) in the specified property where the data is to be retrieved.
• long_length - Specifies how many 32-bit multiples of data should be retrieved (e.g. if you set long_length to 4, you will receive 16 bytes of data).

Errors

• Window - The specified window does not exist.
• Atom - property or type do not refer to a valid atom.
• Value - The specified long_offset is beyond the actual property length (e.g. the property has a length of 3 bytes and you are setting long_offset to 1, resulting in a byte offset of 4).

See

• InternAtom: request
• xprop: program

Example

/*
 * Prints the WM_NAME property of the window.
 *
 */
void my_example(xcb_connection_t *c, xcb_window_t window) {
    xcb_get_property_cookie_t cookie;
    xcb_get_property_reply_t *reply;

    /* These atoms are predefined in the X11 protocol. */
    xcb_atom_t property = XCB_ATOM_WM_NAME;
    xcb_atom_t type = XCB_ATOM_STRING;

    // TODO: a reasonable long_length for WM_NAME?
    cookie = xcb_get_property(c, 0, window, property, type, 0, 0);
    if ((reply = xcb_get_property_reply(c, cookie, NULL))) {
        int len = xcb_get_property_value_length(reply);
        if (len == 0) {
            printf("TODO\\n");
            free(reply);
            return;
        }
        printf("WM_NAME is %.*s\\n", len,
               (char*)xcb_get_property_value(reply));
    }
    free(reply);
}

Fields

delete: bool

window: u32

property: u32

type_: u32

long_offset: u32

long_length: u32

Implementations

impl GetPropertyRequest

pub fn serialize(self) -> ([Cow<'static, [u8]>; 1], Vec<OwnedFd>)

Serialize this request into bytes for the provided connection

Trait Implementations

impl Clone for GetPropertyRequest

fn clone(&self) -> GetPropertyRequest

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GetPropertyRequest

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for GetPropertyRequest

fn default() -> GetPropertyRequest

Returns the “default value” for a type.

impl ReplyRequest for GetPropertyRequest

type Reply = GetPropertyReply

The kind of reply that this request generates.

impl Request for GetPropertyRequest

const EXTENSION_NAME: Option<&'static str> = None

The protocol name of the extension that this request belongs to, or None for core requests

fn serialize(self, _major_opcode: u8) -> (Vec<u8>, Vec<OwnedFd>)

Serialize this request into its X11 protocol wire representation.

impl Copy for GetPropertyRequest