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# QDBus Namespace Reference
[QtDBus module]

The QDBus namespace contains miscellaneous identifiers used throughout the QtDBus library. More...

     #include <QDBus>

### Types

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

## Detailed Description

The QDBus namespace contains miscellaneous identifiers used throughout the QtDBus library.

## 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.