The EncoderParameterValueType enumeration specifies data types for image codec (encoder/decoder) parameters. An element of this enumeration is assigned to the Type data member of an EncoderParameter structure.

 

C++ Syntax

 

typedef enum {

EncoderParameterValueTypeByte = 1,

EncoderParameterValueTypeASCII = 2,

EncoderParameterValueTypeShort = 3,

EncoderParameterValueTypeLong = 4,

EncoderParameterValueTypeRational = 5,

EncoderParameterValueTypeLongRange = 6,

EncoderParameterValueTypeUndefined = 7,

EncoderParameterValueTypeRationalRange = 8,

EncoderParameterValueTypePointer = 9

} EncoderParameterValueType;

 

FreeBASIC 语法

 

enum

EncoderParameterValueTypeByte = 1

EncoderParameterValueTypeASCII = 2

EncoderParameterValueTypeShort = 3

EncoderParameterValueTypeLong = 4

EncoderParameterValueTypeRational = 5

EncoderParameterValueTypeLongRange = 6

EncoderParameterValueTypeUndefined = 7

EncoderParameterValueTypeRationalRange = 8

EncoderParameterValueTypePointer = 9

end enum

 

常数

 

EncoderParameterValueTypeByte

 

Specifies that the parameter is an 8-bit unsigned integer.

 

EncoderParameterValueTypeASCII

 

Specifies that the parameter is a null-terminated character string.

 

EncoderParameterValueTypeShort

 

Specifies that the parameter is a 16-bit unsigned integer.

 

EncoderParameterValueTypeLong

 

Specifies that the parameter is a 32-bit unsigned integer.

 

EncoderParameterValueTypeRational

 

Specifies that the parameter is an array of two, 32-bit unsigned integers. The pair of integers represents a fraction. The first integer in the pair is the numerator, and the second integer in the pair is the denominator.

 

EncoderParameterValueTypeLongRange

 

Specifies that the parameter is an array of two, 32-bit unsigned integers. The pair of integers represents a range of numbers. The first integer is the smallest number in the range, and the second integer is the largest number in the range.

 

EncoderParameterValueTypeUndefined

 

Specifies that the parameter is an array of bytes that can hold values of any type.

 

EncoderParameterValueTypeRationalRange

 

Specifies that the parameter is an array of four, 32-bit unsigned integers. The first two integers represent one fraction, and the second two integers represent a second fraction. The two fractions represent a range of rational numbers. The first fraction is the smallest rational number in the range, and the second fraction is the largest rational number in the range.

 

EncoderParameterValueTypePointer

 

Specifies that the parameter is a pointer to a block of custom metadata.