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NAME

blob - Read or Write Binary Large OBjects

SYNOPSIS

MagickBooleanType BlobToFile( char *filename, const void *blob, const size_t length, ExceptionInfo *exception );

Image * BlobToImage( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );

void DestroyBlob( Image *image );

unsigned char * DetachBlob( BlobInfo *blob_info );

unsigned char * FileToBlob( const char *filename, size_t *length, ExceptionInfo *exception );

MagickBooleanType GetBlobError( const Image *image );

FILE * GetBlobFileHandle( const Image *image );

void GetBlobInfo( BlobInfo *blob_info );

unsigned char * GetBlobStreamData( const Image *image );

StreamHandler GetBlobStreamHandler( const Image *image );

unsigned char * ImageToBlob( const ImageInfo *image_info, Image *image, size_t *length, ExceptionInfo *exception );

MagickBooleanType ImageToFile( Image *image, char *filename, ExceptionInfo *exception );

unsigned char * ImagesToBlob( const ImageInfo *image_info, Image *images, size_t *length, ExceptionInfo *exception );

MagickBooleanType IsBlobExempt( const Image *image );

MagickBooleanType IsBlobSeekable( const Image *image );

MagickBooleanType IsBlobTemporary( const Image *image );

Image * PingBlob( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );

MagickBooleanType SetBlobExempt( const Image *image, const MagickBooleanType exempt );

FUNCTION DESCRIPTIONS

BlobToFile

BlobToFile() writes a blob to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.

The format of the BlobToFile method is:

MagickBooleanType BlobToFile ( char *filename, const void *blob, const size_t length, ExceptionInfo *exception );

A description of each parameter follows:

filename:
Write the blob to this file.

blob:
The address of a blob.

length:
This length in bytes of the blob.

exception:
Return any errors or warnings in this structure.

BlobToImage

BlobToImage() implements direct to memory image formats. It returns the blob as an image.

The format of the BlobToImage method is:

Image *BlobToImage ( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );

A description of each parameter follows:

image_info:
The image info.

blob:
The address of a character stream in one of the image formats understood by ImageMagick.

length:
This size_t integer reflects the length in bytes of the blob.

exception:
Return any errors or warnings in this structure.

DestroyBlob

DestroyBlob() deallocates memory associated with a blob.

The format of the DestroyBlob method is:

void DestroyBlob ( Image *image );

A description of each parameter follows:

image:
The image.

DetachBlob

DetachBlob() detaches a blob from the BlobInfo structure.

The format of the DetachBlob method is:

unsigned char *DetachBlob ( BlobInfo *blob_info );

A description of each parameter follows:

blob_info:
Specifies a pointer to a BlobInfo structure.

FileToBlob

FileToBlob() returns the contents of a file as a blob. It returns the file as a blob and its length. If an error occurs, NULL is returned.

The format of the FileToBlob method is:

unsigned char *FileToBlob ( const char *filename, size_t *length, ExceptionInfo *exception );

A description of each parameter follows:

blob:
FileToBlob() returns the contents of a file as a blob. If an error occurs NULL is returned.

filename:
The filename.

length:
This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.

exception:
Return any errors or warnings in this structure.

GetBlobError

GetBlobError() returns MagickTrue if the blob associated with the specified image encountered an error.

The format of the GetBlobError method is:

MagickBooleanType GetBlobError ( const Image *image );

A description of each parameter follows:

image:
The image.

GetBlobFileHandle

GetBlobFileHandle() returns the file handleassociated with the image blob.

The format of the GetBlobFile method is:

FILE *GetBlobFileHandle ( const Image *image );

A description of each parameter follows:

image:
The image.

GetBlobInfo

GetBlobInfo() initializes the BlobInfo structure.

The format of the GetBlobInfo method is:

void GetBlobInfo ( BlobInfo *blob_info );

A description of each parameter follows:

blob_info:
Specifies a pointer to a BlobInfo structure.

GetBlobStreamData

GetBlobStreamData() returns the stream data for the image.

The format of the GetBlobStreamData method is:

unsigned char *GetBlobStreamData ( const Image *image );

A description of each parameter follows:

image:
The image.

GetBlobStreamHandler

GetBlobStreamHandler() returns the stream handler for the image.

The format of the GetBlobStreamHandler method is:

StreamHandler GetBlobStreamHandler ( const Image *image );

A description of each parameter follows:

image:
The image.

ImageToBlob

ImageToBlob() implements direct to memory image formats. It returns the image as a blob and its length. The magick member of the Image structure determines the format of the returned blob ( GIF, JPEG, PNG, etc. )

The format of the ImageToBlob method is:

unsigned char *ImageToBlob ( const ImageInfo *image_info, Image *image, size_t *length, ExceptionInfo *exception );

A description of each parameter follows:

image_info:
The image info..

image:
The image.

length:
This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.

exception:
Return any errors or warnings in this structure.

ImageToFile

ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.

The format of the ImageToFile method is:

MagickBooleanType ImageToFile ( Image *image, char *filename, ExceptionInfo *exception );

A description of each parameter follows:

image:
The image.

filename:
Write the image to this file.

exception:
Return any errors or warnings in this structure.

ImagesToBlob

ImagesToBlob() implements direct to memory image formats. It returns the image sequence as a blob and its length. The magick member of the Image structure determines the format of the returned blob ( GIF, JPEG, PNG, etc. )

Note, some image formats do not permit multiple images to the same image stream (e.g. JPEG). in this instance, just the first image of the sequence is returned as a blob.

The format of the ImagesToBlob method is:

unsigned char *ImagesToBlob ( const ImageInfo *image_info, Image *images, size_t *length, ExceptionInfo *exception );

A description of each parameter follows:

image_info:
The image info..

images:
The image list.

length:
This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.

exception:
Return any errors or warnings in this structure.

IsBlobExempt

IsBlobExempt() returns true if the blob is exempt.

The format of the IsBlobExempt method is:

MagickBooleanType IsBlobExempt ( const Image *image );

A description of each parameter follows:

image:
The image.

IsBlobSeekable

IsBlobSeekable() returns true if the blob is seekable.

The format of the IsBlobSeekable method is:

MagickBooleanType IsBlobSeekable ( const Image *image );

A description of each parameter follows:

image:
The image.

IsBlobTemporary

IsBlobTemporary() returns true if the blob is temporary.

The format of the IsBlobTemporary method is:

MagickBooleanType IsBlobTemporary ( const Image *image );

A description of each parameter follows:

image:
The image.

PingBlob

PingBlob() returns all the attributes of an image or image sequence except for the pixels. It is much faster and consumes far less memory than BlobToImage ( ) . On failure, a NULL image is returned and exception describes the reason for the failure.

The format of the PingBlob method is:

Image *PingBlob ( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );

A description of each parameter follows:

image_info:
The image info.

blob:
The address of a character stream in one of the image formats understood by ImageMagick.

length:
This size_t integer reflects the length in bytes of the blob.

exception:
Return any errors or warnings in this structure.

SetBlobExempt

SetBlobExempt() sets the blob exempt status.

The format of the SetBlobExempt method is:

MagickBooleanType SetBlobExempt ( const Image *image, const MagickBooleanType exempt );

A description of each parameter follows:

image:
The image.

exempt:
Set to true if this blob is exempt from being closed.
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