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# Port Input and Output Types

Data types for input and output ports.

## Topics

### Constants

[`QCPortTypeBoolean`](/documentation/Quartz/QCPortTypeBoolean)

The port type for a Boolean value.

[`QCPortTypeIndex`](/documentation/Quartz/QCPortTypeIndex)

The port type for an index value.

[`QCPortTypeNumber`](/documentation/Quartz/QCPortTypeNumber)

The port type for a number value.

[`QCPortTypeString`](/documentation/Quartz/QCPortTypeString)

The port type for a string. The associated value can be an NSString object or any object that responds to the `-stringValue` or `-description` methods.

[`QCPortTypeColor`](/documentation/Quartz/QCPortTypeColor)

The port type for a color value.

[`QCPortTypeImage`](/documentation/Quartz/QCPortTypeImage)

The port type for an image.

[`QCPortTypeStructure`](/documentation/Quartz/QCPortTypeStructure)

The port type for a collection.


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