PreviewHandler is an interface for a custom handler that can be passed into DocumentPreviewCache GetBitmap.
|int||DOCUMENT_PREVIEW_RESULT_CANCEL||The request was cancelled before it was processed.|
|int||DOCUMENT_PREVIEW_RESULT_FAILURE||The thumbnail could not be retrieved.|
|int||DOCUMENT_PREVIEW_RESULT_PACKAGE_ERROR||Failure due to encountering a PDF package|
|int||DOCUMENT_PREVIEW_RESULT_POSTPONED||The request was a duplicate of another finished request|
|int||DOCUMENT_PREVIEW_RESULT_PREVIOUS_CRASH||Abort this render because we've crashed on this file previously|
|int||DOCUMENT_PREVIEW_RESULT_SECURITY_ERROR||Failure due to password restriction.|
|int||DOCUMENT_PREVIEW_RESULT_SUCCESS||Successful retrieval of the thumbnail.|
The request was cancelled before it was processed.
The thumbnail could not be retrieved.
Failure due to encountering a PDF package
The request was a duplicate of another finished request
Abort this render because we've crashed on this file previously
Failure due to password restriction.
Successful retrieval of the thumbnail.