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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
  "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>blob - Read or Write Binary Large OBjects</title>
<link rel="stylesheet" type="text/css" href="../magick.css">
</head>

<body marginheight="1" marginwidth="1" topmargin="1" leftmargin="1">
<a name="top"></a> 
<table border="0" cellpadding="0" cellspacing="0" summary="Masthead" width="100%">
<tbody>
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<P><a name="__index__"></a></P>
<!-- INDEX BEGIN -->

<ul>

	<li><a href="#name">NAME</a></li>
	<li><a href="#synopsis">SYNOPSIS</a></li>
	<li><a href="#function_descriptions">FUNCTION DESCRIPTIONS</a></li>
	<ul>

		<li><a href="#attachblob">AttachBlob</a></li>
		<li><a href="#blobtofile">BlobToFile</a></li>
		<li><a href="#blobtoimage">BlobToImage</a></li>
		<li><a href="#cloneblobinfo">CloneBlobInfo</a></li>
		<li><a href="#destroyblob">DestroyBlob</a></li>
		<li><a href="#detachblob">DetachBlob</a></li>
		<li><a href="#filetoblob">FileToBlob</a></li>
		<li><a href="#getbloberror">GetBlobError</a></li>
		<li><a href="#getblobfilehandle">GetBlobFileHandle</a></li>
		<li><a href="#getblobinfo">GetBlobInfo</a></li>
		<li><a href="#getblobstreamdata">GetBlobStreamData</a></li>
		<li><a href="#getblobstreamhandler">GetBlobStreamHandler</a></li>
		<li><a href="#imagetoblob">ImageToBlob</a></li>
		<li><a href="#imagetofile">ImageToFile</a></li>
		<li><a href="#isblobexempt">IsBlobExempt</a></li>
		<li><a href="#isblobseekable">IsBlobSeekable</a></li>
		<li><a href="#isblobtemporary">IsBlobTemporary</a></li>
		<li><a href="#pingblob">PingBlob</a></li>
		<li><a href="#referenceblob">ReferenceBlob</a></li>
		<li><a href="#setblobexempt">SetBlobExempt</a></li>
	</ul>

</ul>
<!-- INDEX END -->

<hr />
<P>
</P>
<h1><a name="name">NAME</a></h1>
<P>blob - Read or Write Binary Large OBjects</P>
<P>
</P>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<P>void  <strong>AttachBlob</strong>( BlobInfo *blob_info, const void *blob, const size_t length );</P>
<P>MagickBooleanType  <strong>BlobToFile</strong>( char *filename, const void *blob, const size_t length, ExceptionInfo *exception );</P>
<P>Image * <strong>BlobToImage</strong>( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );</P>
<P>BlobInfo * <strong>CloneBlobInfo</strong>( const BlobInfo *blob_info );</P>
<P>void  <strong>DestroyBlob</strong>( Image *image );</P>
<P>unsigned char * <strong>DetachBlob</strong>( BlobInfo *blob_info );</P>
<P>unsigned char * <strong>FileToBlob</strong>( const char *filename, size_t *length, ExceptionInfo *exception );</P>
<P>MagickBooleanType  <strong>GetBlobError</strong>( const Image *image );</P>
<P>FILE * <strong>GetBlobFileHandle</strong>( const Image *image );</P>
<P>void  <strong>GetBlobInfo</strong>( BlobInfo *blob_info );</P>
<P>unsigned char * <strong>GetBlobStreamData</strong>( const Image *image );</P>
<P>StreamHandler  <strong>GetBlobStreamHandler</strong>( const Image *image );</P>
<P>unsigned char * <strong>ImageToBlob</strong>( const ImageInfo *image_info, Image *image, size_t *length, ExceptionInfo *exception );</P>
<P>MagickBooleanType  <strong>ImageToFile</strong>( Image *image, char *filename, ExceptionInfo *exception );</P>
<P>MagickBooleanType  <strong>IsBlobExempt</strong>( const Image *image );</P>
<P>MagickBooleanType  <strong>IsBlobSeekable</strong>( const Image *image );</P>
<P>MagickBooleanType  <strong>IsBlobTemporary</strong>( const Image *image );</P>
<P>Image * <strong>PingBlob</strong>( const ImageInfo *image_info, const void *blob, const size_t length, ExceptionInfo *exception );</P>
<P>BlobInfo  <strong>ReferenceBlob</strong>( BlobInfo *blob_info );</P>
<P>MagickBooleanType  <strong>SetBlobExempt</strong>( const Image *image, const MagickBooleanType exempt );</P>
<P>
</P>
<hr />
<h1><a name="function_descriptions">FUNCTION DESCRIPTIONS</a></h1>
<P>
</P>
<h2><a name="attachblob">AttachBlob</a></h2>
<blockquote>AttachBlob() attaches a blob to the <A HREF="types.html#BlobInfo">BlobInfo</A> structure. </blockquote><P>The format of the AttachBlob method is:</P>
<blockquote>void AttachBlob ( <A HREF="types.html#BlobInfo">BlobInfo</A> *blob_info, const void *blob, const size_t length ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_blob_info_3a">blob_info:</a></strong><br />
</dt>
<DD>
Specifies a pointer to a BlobInfo structure.
</dd>
<P></P>
<dt><strong><a name="item_o_blob_3a">blob:</a></strong><br />
</dt>
<DD>
The address of a character stream in one of the image formats understood by ImageMagick.
</dd>
<P></P>
<dt><strong><a name="item_o_length_3a">length:</a></strong><br />
</dt>
<DD>
This size_t integer reflects the length in bytes of the blob.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="blobtofile">BlobToFile</a></h2>
<blockquote>BlobToFile() writes a blob to a file. It returns MagickFalse if an error occurs otherwise MagickTrue. </blockquote><P>The format of the BlobToFile method is:</P>
<blockquote>MagickBooleanType BlobToFile ( char *filename, const void *blob, const size_t length, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_filename_3a">filename:</a></strong><br />
</dt>
<DD>
Write the blob to this file.
</dd>
<P></P>
<dt><strong>blob:</strong><br />
</dt>
<DD>
The address of a blob.
</dd>
<P></P>
<dt><strong>length:</strong><br />
</dt>
<DD>
This length in bytes of the blob.
</dd>
<P></P>
<dt><strong><a name="item_o_exception_3a">exception:</a></strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="blobtoimage">BlobToImage</a></h2>
<blockquote>BlobToImage() implements direct to memory image formats. It returns the blob as an image. </blockquote><P>The format of the BlobToImage method is:</P>
<blockquote><A HREF="types.html#Image">Image</A> *BlobToImage ( const <A HREF="types.html#ImageInfo">ImageInfo</A> *image_info, const void *blob, const size_t length, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_image_info_3a">image_info:</a></strong><br />
</dt>
<DD>
The image info.
</dd>
<P></P>
<dt><strong>blob:</strong><br />
</dt>
<DD>
The address of a character stream in one of the image formats understood by ImageMagick.
</dd>
<P></P>
<dt><strong>length:</strong><br />
</dt>
<DD>
This size_t integer reflects the length in bytes of the blob.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="cloneblobinfo">CloneBlobInfo</a></h2>
<blockquote>CloneBlobInfo() makes a duplicate of the given blob info structure, or if blob info is NULL, a new one. </blockquote><P>The format of the CloneBlobInfo method is:</P>
<blockquote><A HREF="types.html#BlobInfo">BlobInfo</A> *CloneBlobInfo ( const <A HREF="types.html#BlobInfo">BlobInfo</A> *blob_info ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_clone_info_3a">clone_info:</a></strong><br />
</dt>
<DD>
Method CloneBlobInfo returns a duplicate of the given blob info, or if blob info is NULL a new one.
</dd>
<P></P>
<dt><strong><a name="item_o_quantize_info_3a">quantize_info:</a></strong><br />
</dt>
<DD>
a structure of type info.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="destroyblob">DestroyBlob</a></h2>
<blockquote>DestroyBlob() deallocates memory associated with a blob. </blockquote><P>The format of the DestroyBlob method is:</P>
<blockquote>void DestroyBlob ( <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_image_3a">image:</a></strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="detachblob">DetachBlob</a></h2>
<blockquote>DetachBlob() detaches a blob from the <A HREF="types.html#BlobInfo">BlobInfo</A> structure. </blockquote><P>The format of the DetachBlob method is:</P>
<blockquote>unsigned char *DetachBlob ( <A HREF="types.html#BlobInfo">BlobInfo</A> *blob_info ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>blob_info:</strong><br />
</dt>
<DD>
Specifies a pointer to a BlobInfo structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="filetoblob">FileToBlob</a></h2>
<blockquote>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. </blockquote><P>The format of the FileToBlob method is:</P>
<blockquote>unsigned char *FileToBlob ( const char *filename, size_t *length, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>blob:</strong><br />
</dt>
<DD>
<code>FileToBlob()</code> returns the contents of a file as a blob.  If an error occurs NULL is returned.
</dd>
<P></P>
<dt><strong>filename:</strong><br />
</dt>
<DD>
The filename.
</dd>
<P></P>
<dt><strong>length:</strong><br />
</dt>
<DD>
This pointer to a size_t integer sets the initial length of the blob.  On return, it reflects the actual length of the blob.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getbloberror">GetBlobError</a></h2>
<blockquote>GetBlobError() returns MagickTrue if the blob associated with the specified image encountered an error. </blockquote><P>The format of the GetBlobError method is:</P>
<blockquote>MagickBooleanType GetBlobError ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getblobfilehandle">GetBlobFileHandle</a></h2>
<blockquote>GetBlobFileHandle() returns the file handleassociated with the image blob. </blockquote><P>The format of the GetBlobFile method is:</P>
<blockquote>FILE *GetBlobFileHandle ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getblobinfo">GetBlobInfo</a></h2>
<blockquote>GetBlobInfo() initializes the <A HREF="types.html#BlobInfo">BlobInfo</A> structure. </blockquote><P>The format of the GetBlobInfo method is:</P>
<blockquote>void GetBlobInfo ( <A HREF="types.html#BlobInfo">BlobInfo</A> *blob_info ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>blob_info:</strong><br />
</dt>
<DD>
Specifies a pointer to a BlobInfo structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getblobstreamdata">GetBlobStreamData</a></h2>
<blockquote>GetBlobStreamData() returns the stream data for the image. </blockquote><P>The format of the GetBlobStreamData method is:</P>
<blockquote>unsigned char *GetBlobStreamData ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getblobstreamhandler">GetBlobStreamHandler</a></h2>
<blockquote>GetBlobStreamHandler() returns the stream handler for the image. </blockquote><P>The format of the GetBlobStreamHandler method is:</P>
<blockquote><A HREF="types.html#StreamHandler">StreamHandler</A> GetBlobStreamHandler ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="imagetoblob">ImageToBlob</a></h2>
<blockquote>ImageToBlob() implements direct to memory image formats. It returns the image as a blob and its length. The magick member of the <A HREF="types.html#Image">Image</A> structure determines the format of the returned blob ( GIF, JPEG, PNG, etc. ) </blockquote><P>The format of the ImageToBlob method is:</P>
<blockquote>unsigned char *ImageToBlob ( const <A HREF="types.html#ImageInfo">ImageInfo</A> *image_info, <A HREF="types.html#Image">Image</A> *image, size_t *length, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image_info:</strong><br />
</dt>
<DD>
The image info..
</dd>
<P></P>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>length:</strong><br />
</dt>
<DD>
This pointer to a size_t integer sets the initial length of the blob.  On return, it reflects the actual length of the blob.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="imagetofile">ImageToFile</a></h2>
<blockquote>ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue. </blockquote><P>The format of the ImageToFile method is:</P>
<blockquote>MagickBooleanType ImageToFile ( <A HREF="types.html#Image">Image</A> *image, char *filename, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>filename:</strong><br />
</dt>
<DD>
Write the image to this file.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="isblobexempt">IsBlobExempt</a></h2>
<blockquote>IsBlobExempt() returns true if the blob is exempt. </blockquote><P>The format of the IsBlobExempt method is:</P>
<blockquote>MagickBooleanType IsBlobExempt ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="isblobseekable">IsBlobSeekable</a></h2>
<blockquote>IsBlobSeekable() returns true if the blob is seekable. </blockquote><P>The format of the IsBlobSeekable method is:</P>
<blockquote>MagickBooleanType IsBlobSeekable ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="isblobtemporary">IsBlobTemporary</a></h2>
<blockquote>IsBlobTemporary() returns true if the blob is temporary. </blockquote><P>The format of the IsBlobTemporary method is:</P>
<blockquote>MagickBooleanType IsBlobTemporary ( const <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="pingblob">PingBlob</a></h2>
<blockquote>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. </blockquote><P>The format of the PingBlob method is:</P>
<blockquote><A HREF="types.html#Image">Image</A> *PingBlob ( const <A HREF="types.html#ImageInfo">ImageInfo</A> *image_info, const void *blob, const size_t length, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image_info:</strong><br />
</dt>
<DD>
The image info.
</dd>
<P></P>
<dt><strong>blob:</strong><br />
</dt>
<DD>
The address of a character stream in one of the image formats understood by ImageMagick.
</dd>
<P></P>
<dt><strong>length:</strong><br />
</dt>
<DD>
This size_t integer reflects the length in bytes of the blob.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="referenceblob">ReferenceBlob</a></h2>
<blockquote>ReferenceBlob() increments the reference count associated with the pixel blob returning a pointer to the blob. </blockquote><P>The format of the ReferenceBlob method is:</P>
<blockquote><A HREF="types.html#BlobInfo">BlobInfo</A> ReferenceBlob ( <A HREF="types.html#BlobInfo">BlobInfo</A> *blob_info ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>blob_info:</strong><br />
</dt>
<DD>
The blob_info.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="setblobexempt">SetBlobExempt</a></h2>
<blockquote>SetBlobExempt() sets the blob exempt status. </blockquote><P>The format of the SetBlobExempt method is:</P>
<blockquote>MagickBooleanType SetBlobExempt ( const <A HREF="types.html#Image">Image</A> *image, const MagickBooleanType exempt ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_exempt_3a">exempt:</a></strong><br />
</dt>
<DD>
Set to true if this blob is exempt from being closed.
</dd>
</dl>


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