THPDFJobProcessor.Execute
Runs a complete file-job described by JSON text and returns the results as JSON
class function Execute(const JobJSON: AnsiString): AnsiString; static;
The unit is HPDFDocJobs; the job text is limited to 4 MiB and its operations array to 1024 entries
Each element of the operations array is dispatched to ExecuteOperation, and the returned document collects one result object per operation
An empty or non-object job behaves as an empty operation list