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This function reads the value of specified parameter. The parameter has to be of type filename. If this is not the case error code is returned. It is possible to enter empty string (without accepting default value). By default entering string "" (two doublequotes) sets value of given string parameter to an empty string. If PIL_EMPTY_STRING environment variable is defined then its value is taken as an empty string equivalent.

Bryan Irby 2004-10-05