- Qt 6.9
- Qt D-Bus
- QDBus Namespace
- Qt 6.9.3 Reference Documentation

# QDBus Namespace

The QDBus namespace contains miscellaneous identifiers used throughout the Qt D-Bus module. More...

Header: | `#include <QDBus>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS DBus)` `target_link_libraries(mytarget PRIVATE Qt6::DBus)`
qmake: | `QT += dbus`

## Types

enum | CallMode { NoBlock, Block, BlockWithGui, AutoDetect }

## Detailed Description

## Type Documentation

### enum QDBus::CallMode

This enum describes the various ways of placing a function call. The valid modes are:

Constant | Value | Description
--- | --- | ---
`QDBus::NoBlock` | `0` | Place the call but don't wait for the reply (the reply's contents will be discarded).
`QDBus::Block` | `1` | Don't use an event loop to wait for a reply, but instead block on network operations while waiting. This means the user-interface may not be updated until the function returns.
`QDBus::BlockWithGui` | `2` | Use the Qt event loop to wait for a reply. This means that the user-interface will stay responsive (processing input events), but it also means other events may happen, like signal delivery and other D-Bus method calls.
`QDBus::AutoDetect` | `3` | Automatically detect if the called function has a reply.

When using BlockWithGui, applications must be prepared for reentrancy in any function.