DTwainCompressedTransfer::IsCompressionTypeSupported

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Syntax

 

bool DTwainCompressedTransfer::IsCompressionTypeSupported( DTwainCompressionType & CT ) const;

 

 

Comments

 

 

Returns true if the compression type CT is supported by the attached DTwainSource.  Attaching a Twain Source is discussed in the DTwainBufferedTransfer and DTwainSourceMode overviews.

 

The various values of CT are as follows:

 

COMPRESS_NONE

No compression (all Twain Sources must support "no compresion").

COMPRESS_PACKBITS    

Compression using PackBits format.

COMPRESS_GROUP31D    

Compression using Group 3 encoding.

COMPRESS_GROUP31DEOL

Compression using Group 3 encoding.

COMPRESS_GROUP32D

Compression using Group 3 encoding.

COMPRESS_GROUP4

Compression using Group 4 encoding.

COMPRESS_JPEG

Compression using JPEG encoding.

COMPRESS_LZW

Compression using LZW encoding.

COMPRESS_JBIG

Compression using JBIG encoding.

COMPRESS_PNG

Compression using PNG encoding.

COMPRESS_RLE4

Compression using Run Length encoding.

COMPRESS_RLE8

Compression using Run Length encoding.

COMPRESS_BITFIELDS

Compression using Bitfields encoding.