win2pdfd.exe pagecount "sourcefile"
Returns number of PDF pages from “sourcefile”. If the “sourcefile” file name contains spaces, it must be enclosed with quotation marks. The "sourcefile" can be a local file path, or an web address (URL) to an existing PDF.
From the Windows CMD prompt, the page count can be referenced using the built-in %ERRORLEVEL% environment variable. This can be referenced from other Win2PDF command line options in a batch file.
From PowerShell, the page count can be referenced using $LASTEXITCODE.
Returns 0 if an error occurs.