Atempting to use Foxit Quick PDF Library without a license key, with an expired trial license key or with an invalid license key, will result in the follow functions being being blocked:
- DAOpenFile
- GetInformation
- LoadFromStream
- LoadFromString
- MergeDocument
- NewDocument
- SaveToFile
- SaveToString
- SecurityInfo
- EncryptFile
- DecryptFile
- AnalyseFile
- MergeFiles
- MergeStreams
- MergeFileListFast
- ExtractFilePageContent
- ExtractFilePageText
- ExtractFilePages
- GetFileMetadata
Check the result of the UnlockKey function
In order to reduce any confusion, you should check the result of the UnlockKey function before doing anything else. If the function returns a 0 then this means that the license key is either missing, expired or invalid, if the function returns a 1 then this means that the license key is valid and you will be able to access the full functionality of the library.