---
name: "xcb_res_query_resource_bytes"
section: "3"
platform: "linux"
package: "libxcb"
version: "1.17.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/xcb_res_query_resource_bytes"
---

# xcb\_res\_query\_resource\_bytes(3)

## NAME

xcb\_res\_query\_resource\_bytes -

## SYNOPSIS

**#include \<xcb/res.h\>**

### Request function

xcb\_res\_query\_resource\_bytes\_cookie\_t **xcb\_res\_query\_resource\_bytes**(xcb\_connection\_t \**conn*, uint32\_t *client*, uint32\_t *num\_specs*, const xcb\_res\_resource\_id\_spec\_t \**specs*);

### Reply datastructure

```

typedef struct xcb_res_query_resource_bytes_reply_t {
    uint8_t  response_type;
    uint8_t  pad0;
    uint16_t sequence;
    uint32_t length;
    uint32_t num_sizes;
    uint8_t  pad1[20];
} xcb_res_query_resource_bytes_reply_t;
```

### Reply function

xcb\_res\_query\_resource\_bytes\_reply\_t \***xcb\_res\_query\_resource\_bytes\_reply**(xcb\_connection\_t \**conn*, xcb\_res\_query\_resource\_bytes\_cookie\_t *cookie*, xcb\_generic\_error\_t \*\**e*);

### Reply accessors

int **xcb\_res\_query\_resource\_bytes\_sizes\_length**(const xcb\_res\_query\_resource\_bytes\_reply\_t \**reply*);

xcb\_res\_resource\_size\_value\_iterator\_t **xcb\_res\_query\_resource\_bytes\_sizes\_iterator**(const xcb\_res\_query\_resource\_bytes\_reply\_t \**reply*);\

## REQUEST ARGUMENTS

- *conn*

  The XCB connection to X11.

- *client*

  TODO: NOT YET DOCUMENTED.

- *num\_specs*

  TODO: NOT YET DOCUMENTED.

- *specs*

  TODO: NOT YET DOCUMENTED.

## REPLY FIELDS

- *response\_type*

  The type of this reply, in this case *XCB\_RES\_QUERY\_RESOURCE\_BYTES*. This field is also present in the *xcb\_generic\_reply\_t* and can be used to tell replies apart from each other.

- *sequence*

  The sequence number of the last request processed by the X11 server.

- *length*

  The length of the reply, in words (a word is 4 bytes).

- *num\_sizes*

  TODO: NOT YET DOCUMENTED.

## DESCRIPTION

## RETURN VALUE

Returns an *xcb\_res\_query\_resource\_bytes\_cookie\_t*. Errors have to be handled when calling the reply function *xcb\_res\_query\_resource\_bytes\_reply*.

If you want to handle errors in the event loop instead, use *xcb\_res\_query\_resource\_bytes\_unchecked*. See **[xcb-requests(3)](/xcb-requests/3.md)** for details.

## ERRORS

This request does never generate any errors.

## SEE ALSO

## AUTHOR

Generated from res.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.