QPx_ValidateImporter

QPx_ValidateImporter(importerRef; importerRef):error
	importerRef	Longint	Reference to a graphics importer instance
	validFlag	Longint	Validation result
	error	Longint	Error result

Calls a graphics importer instance to check if its associated image source (file or BLOB) contains valid image data.

The graphics importer instance is specified by importerRef. If importerRef does not refer to an existing graphics importer instance, the qpx_paramErr error code is returned.

The result of validation is returned in the validFlag parameter. A value of 0 means that the data is invalid; valid data return a value of 1.

ATTENTION Not all importers implement this call. If the specified importer does not, this command will return the qpx_badCompSel error. This doesn't mean that the image data are valid – or that they are not.

Example

   // Validate the importer

C_LONGINT($error)
C_LONGINT($valid)

C_LONGINT(gQPixImporter)

$error:=QPx_ValidateImporter (gQPixImporter;$valid)

Case of 
   : ($error=qpx_noErr)
      
         // $valid contains 0 or 1
      
   : ($error=qpx_badCompSel)
      
         //Importer does not support validation
      
   Else 
      
         // Handle the error
      
End case 

Related commands