public static DisplayTopology GetDisplayTopology()
{
uint numPathArrayElements = 0;
uint numModeInfoArrayElements = 0;
NativeMethods.GetDisplayConfigBufferSizes( QueryDisplayFlags.DatabaseCurrent, out numPathArrayElements, out numModeInfoArrayElements );
var pathArray = new DisplayConfigPathInfo[numPathArrayElements];
var modeArray = new DisplayConfigModeInfo[numModeInfoArrayElements];
DisplayConfigTopologyId displayTopology;
NativeMethods.QueryDisplayConfig( QueryDisplayFlags.DatabaseCurrent, out numPathArrayElements, pathArray, out numModeInfoArrayElements, modeArray, out displayTopology );
switch( displayTopology ) {
case DisplayConfigTopologyId.External: return DisplayTopology.External;
case DisplayConfigTopologyId.Internal: return DisplayTopology.Internal;
case DisplayConfigTopologyId.Extend: return DisplayTopology.Extend;
}
return DisplayTopology.Clone;
}
/// <summary>
/// This method can be used in order to filter out specific paths that we are interested,
/// a long with their corresponding paths.
/// </summary>
/// <param name="pathType"></param>
/// <param name="topologyId"></param>
/// <returns></returns>
public static IEnumerable<DisplayConfigPathWrap> GetPathWraps(
QueryDisplayFlags pathType,
out DisplayConfigTopologyId topologyId)
{
topologyId = DisplayConfigTopologyId.Zero;
int numPathArrayElements;
int numModeInfoArrayElements;
var status = Wrapper.GetDisplayConfigBufferSizes(
pathType,
out numPathArrayElements,
out numModeInfoArrayElements);
if (status != StatusCode.Success)
{
// TODO; POSSIBLY HANDLE SOME OF THE CASES.
var reason = string.Format("GetDisplayConfigBufferSizesFailed() failed. Status: {0}", status);
throw new Exception(reason);
}
var pathInfoArray = new DisplayConfigPathInfo[numPathArrayElements];
var modeInfoArray = new DisplayConfigModeInfo[numModeInfoArrayElements];
// topology ID only valid with QDC_DATABASE_CURRENT
var queryDisplayStatus = pathType == QueryDisplayFlags.DatabaseCurrent
? Wrapper.QueryDisplayConfig(
pathType,
ref numPathArrayElements, pathInfoArray,
ref numModeInfoArrayElements, modeInfoArray, out topologyId)
: Wrapper.QueryDisplayConfig(
pathType,
ref numPathArrayElements, pathInfoArray,
ref numModeInfoArrayElements, modeInfoArray);
//////////////////////
if (queryDisplayStatus != StatusCode.Success)
{
// TODO; POSSIBLY HANDLE SOME OF THE CASES.
var reason = string.Format("QueryDisplayConfig() failed. Status: {0}", queryDisplayStatus);
throw new Exception(reason);
}
var list = new List<DisplayConfigPathWrap>();
foreach (var path in pathInfoArray)
{
var outputModes = new List<DisplayConfigModeInfo>();
foreach (var modeIndex in new[]
{
path.sourceInfo.modeInfoIdx,
path.targetInfo.modeInfoIdx
})
{
if (modeIndex < modeInfoArray.Length)
outputModes.Add(modeInfoArray[modeIndex]);
}
list.Add(new DisplayConfigPathWrap(path, outputModes));
}
return list;
}
/// <summary>
/// Initializes new structure. Having constructor for struct makes it immutable.
/// </summary>
/// <param name="path"></param>
/// <param name="modeInfo"></param>
public DisplayConfigPathWrap(DisplayConfigPathInfo path,
IEnumerable<DisplayConfigModeInfo> modeInfo) : this()
{
Path = path;
Modes = modeInfo;
}
