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QueryDisplayConfig Summary and Scenarios

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This section applies only to Windows 7 and later, and Windows Server 2008 R2 and later versions of Windows operating system.

The following sections summarize how a caller uses the QueryDisplayConfig CCD function and provide scenarios for using QueryDisplayConfig.

QueryDisplayConfig Summary

The caller can use QueryDisplayConfig to enumerate any of the following information:

  • All of the individual paths that are possible for the current set of connected monitors. The caller can then combine the paths to construct possible topologies.

  • All of the paths that are currently active.

  • The active paths as they are currently defined in the persistence database for the set of connected displays.

  • The source and target mode along with orientation, scaling, layout, and connector type on a per-path basis.

  • The hot-key options that the current topology maps to.

QueryDisplayConfig Scenarios

QueryDisplayConfig is called in the following scenarios:

  • The display control panel applet calls QueryDisplayConfig to populate the Control Panel's user interface with the current applied topology when the Control Panel first starts. The current applied topology includes those displays on which forced projection is enabled.

  • The display control panel applet calls QueryDisplayConfig to enumerate all of the possible paths to populate the multimon drop-down box.

  • Before the Control Panel user interface starts, the display hot key calls QueryDisplayConfig to obtain the display option (that is, clone, internal, external, or extended) that is currently set.

  • A third party application might call QueryDisplayConfig to query the current settings that are stored in the database for the set of connected displays.