Class: QgsProcessingParameterFile

class qgis.core.QgsProcessingParameterFile

Bases: QgsProcessingParameterDefinition, QgsFileFilterGenerator

An input file or folder parameter for processing algorithms.

New in version 3.0.

QgsProcessingParameterFile(name: str, description: str = ‘’, behavior: QgsProcessingParameterFile.Behavior = QgsProcessingParameterFile.File, extension: str = ‘’, defaultValue: Any = None, optional: bool = False, fileFilter: str = ‘’) Constructor for QgsProcessingParameterFile.

The extension argument allows for specifying a file extension associated with the parameter (e.g. “html”). Use fileFilter for a more flexible approach which allows for multiple file extensions. Only one of extension or fileFilter should be specified, if both are specified then fileFilter takes precedence.

QgsProcessingParameterFile(QgsProcessingParameterFile)

Methods

asPythonString	param outputType:
asScriptCode	rtype: str
behavior	Returns the parameter behavior (e.g. File or Folder).
checkValueIsAcceptable	param input:
clone	rtype: QgsProcessingParameterDefinition
createFileFilter	rtype: str
defaultGuiValueFromSetting	Default gui value for an algorithm parameter from settings
extension	Returns any specified file extension for the parameter.
fileFilter	Returns the file filter string for file destinations compatible with this parameter.
fromScriptCode	Creates a new parameter using the definition from a script code.
fromVariantMap	param map:
setBehavior	Sets the parameter behavior (e.g. File or Folder).
setExtension	Sets a file extension for the parameter.
setFileFilter	Sets the file filter string for file destinations compatible with this parameter.
toVariantMap	rtype: Dict[str, Any]
type	rtype: str
typeName	Returns the type name for the parameter class.

Attributes

File
Folder

class Behavior

Bases: int

File = 0

Folder = 1

asPythonString(self, outputType: QgsProcessing.PythonOutputType = QgsProcessing.PythonQgsProcessingAlgorithmSubclass) → str

Parameters:

outputType (QgsProcessing.PythonOutputType = QgsProcessing.PythonQgsProcessingAlgorithmSubclass) –

Return type:

str

asScriptCode(self) → str

Return type:

str

behavior(self) → QgsProcessingParameterFile.Behavior

Returns the parameter behavior (e.g. File or Folder).

See also

setBehavior()

Return type:

QgsProcessingParameterFile.Behavior

checkValueIsAcceptable(self, input: Any, context: QgsProcessingContext = None) → bool

Parameters:

• input (Any) –

• context (QgsProcessingContext = None) –

Return type:

bool

clone(self) → QgsProcessingParameterDefinition

Return type:

QgsProcessingParameterDefinition

createFileFilter(self) → str

Return type:

str

defaultGuiValueFromSetting(self) → Any

Default gui value for an algorithm parameter from settings

Returns:

default value from settings or invalid QVariant if there is no default value defined in the settings

New in version 3.34.

extension(self) → str

Returns any specified file extension for the parameter.

Note

See fileFilter() for a more flexible approach.

See also

setExtension()

Return type:

str

fileFilter(self) → str

Returns the file filter string for file destinations compatible with this parameter.

See also

setFileFilter()

See also

extension()

New in version 3.10.

Return type:

str

fromScriptCode(name: str, description: str, isOptional: bool, definition: str, behavior: QgsProcessingParameterFile.Behavior = QgsProcessingParameterFile.File) → QgsProcessingParameterFile

Creates a new parameter using the definition from a script code.

Parameters:

• name (str) –

• description (str) –

• isOptional (bool) –

• definition (str) –

• behavior (QgsProcessingParameterFile.Behavior = QgsProcessingParameterFile.File) –

Return type:

QgsProcessingParameterFile

fromVariantMap(self, map: Dict[str, Any]) → bool

Parameters:

map (Dict[str) –

Return type:

bool

setBehavior(self, behavior: QgsProcessingParameterFile.Behavior)

Sets the parameter behavior (e.g. File or Folder).

See also

behavior()

Parameters:

behavior (QgsProcessingParameterFile.Behavior) –

setExtension(self, extension: str)

Sets a file extension for the parameter.

Calling this method resets any existing fileFilter().

Note

See setFileFilter() for a more flexible approach.

See also

extension()

Parameters:

extension (str) –

setFileFilter(self, filter: str)

Sets the file filter string for file destinations compatible with this parameter.

Calling this method resets any existing extension() setting.

See also

fileFilter()

See also

setExtension()

New in version 3.10.

Parameters:

filter (str) –

toVariantMap(self) → Dict[str, Any]

Return type:

Dict[str, Any]

type(self) → str

Return type:

str

typeName() → str

Returns the type name for the parameter class.

Return type:

str