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CFStringGetDoubleValue(_:)

Returns the primary double value represented by a string.

Declaration

func CFStringGetDoubleValue(_ str: CFString!) -> Double

Parameters

  • str:

    A string that represents a double value. The only allowed characters are the ASCII digit characters (ASCII 0x30 - 0x39), the plus sign (ASCII 0x2B), the minus sign (ASCII 0x2D), and the period character (ASCII 0x2E).

Return Value

The double value represented by str, or 0.0 if there is a scanning error (if the string contains disallowed characters or does not represent a double value).

Discussion

Consider the following example:

double val = CFStringGetDoubleValue(CFSTR("0.123"));

The variable val in this example would contain the value 0.123 after the function is called.

See Also

Getting Numeric Values