/// <summary>
/// This is used to get the content of a specific topic file if it is open in an editor so that the
/// current content is displayed for it in the topic previewer control.
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event arguments</param>
private void ucTopicPreviewer_TopicContentNeeded(object sender, TopicContentNeededEventArgs e)
{
TopicEditorWindow topicEditor;
foreach (IDockContent content in this.DockPanel.Documents)
{
topicEditor = content as TopicEditorWindow;
if (topicEditor != null && topicEditor.Filename.Equals(e.TopicFilename, StringComparison.OrdinalIgnoreCase))
{
e.TopicContent = topicEditor.FileContent;
}
}
}
/// <summary>
/// This is used to get the content of a specific topic file if it is open in an editor so that the
/// current content is displayed for it in the topic previewer control.
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event arguments</param>
private void ucTopicPreviewer_TopicContentNeeded(object sender, TopicContentNeededEventArgs e)
{
ThreadHelper.ThrowIfNotOnUIThread();
IVsPersistDocData persistDocData;
IVsTextStream srpStream;
IntPtr docData = IntPtr.Zero;
uint cookie = 0;
int hr = VSConstants.E_FAIL;
IVsRunningDocumentTable rdt = Utility.GetServiceFromPackage <IVsRunningDocumentTable,
SVsRunningDocumentTable>(true);
if (rdt == null)
{
return;
}
try
{
// Getting a read lock on the document. This must be released later.
hr = rdt.FindAndLockDocument((uint)_VSRDTFLAGS.RDT_ReadLock, e.TopicFilename, out IVsHierarchy hier,
out uint itemid, out docData, out cookie);
if (ErrorHandler.Failed(hr) || docData == IntPtr.Zero)
{
return;
}
persistDocData = Marshal.GetObjectForIUnknown(docData) as IVsPersistDocData;
// Try to get the Text lines
IVsTextLines srpTextLines = persistDocData as IVsTextLines;
if (srpTextLines == null)
{
// Try getting a text buffer provider first
if (persistDocData is IVsTextBufferProvider srpTextBufferProvider)
{
hr = srpTextBufferProvider.GetTextBuffer(out srpTextLines);
}
}
if (ErrorHandler.Succeeded(hr))
{
srpStream = srpTextLines as IVsTextStream;
if (srpStream != null)
{
if (srpStream is IVsBatchUpdate srpBatchUpdate)
{
ErrorHandler.ThrowOnFailure(srpBatchUpdate.FlushPendingUpdates(0));
}
hr = srpStream.GetSize(out int lBufferSize);
if (ErrorHandler.Succeeded(hr))
{
IntPtr dest = IntPtr.Zero;
try
{
// GetStream() returns Unicode data so we need to double the buffer size
dest = Marshal.AllocCoTaskMem((lBufferSize + 1) * 2);
ErrorHandler.ThrowOnFailure(srpStream.GetStream(0, lBufferSize, dest));
// Get the contents
e.TopicContent = Marshal.PtrToStringUni(dest);
}
finally
{
if (dest != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(dest);
}
}
}
}
}
}
finally
{
if (docData != IntPtr.Zero)
{
Marshal.Release(docData);
}
if (cookie != 0)
{
ErrorHandler.ThrowOnFailure(rdt.UnlockDocument((uint)_VSRDTFLAGS.RDT_ReadLock, cookie));
}
}
}