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+<html><head>
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+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="../sqlite.css" rel="stylesheet">
+<title>Read Data From A BLOB Incrementally</title>
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+<!-- keywords: sqlite3_blob_read -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Read Data From A BLOB Incrementally</h2>
+</div>
+<blockquote><pre>
+int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);
+</pre></blockquote>
+<p>
+This function is used to read data from an open <a href="../c3ref/blob.html">BLOB handle</a> into a
+caller-supplied buffer. N bytes of data are copied into buffer Z
+from the open BLOB, starting at offset iOffset.</p>
+
+<p>If offset iOffset is less than N bytes from the end of the BLOB,
+<a href="../rescode.html#error">SQLITE_ERROR</a> is returned and no data is read.  If N or iOffset is
+less than zero, <a href="../rescode.html#error">SQLITE_ERROR</a> is returned and no data is read.
+The size of the blob (and hence the maximum value of N+iOffset)
+can be determined using the <a href="../c3ref/blob_bytes.html">sqlite3_blob_bytes()</a> interface.</p>
+
+<p>An attempt to read from an expired <a href="../c3ref/blob.html">BLOB handle</a> fails with an
+error code of <a href="../rescode.html#abort">SQLITE_ABORT</a>.</p>
+
+<p>On success, sqlite3_blob_read() returns SQLITE_OK.
+Otherwise, an <a href="../rescode.html">error code</a> or an <a href="../rescode.html#extrc">extended error code</a> is returned.</p>
+
+<p>This routine only works on a <a href="../c3ref/blob.html">BLOB handle</a> which has been created
+by a prior successful call to <a href="../c3ref/blob_open.html">sqlite3_blob_open()</a> and which has not
+been closed by <a href="../c3ref/blob_close.html">sqlite3_blob_close()</a>.  Passing any other pointer in
+to this routine results in undefined and probably undesirable behavior.</p>
+
+<p>See also: <a href="../c3ref/blob_write.html">sqlite3_blob_write()</a>.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+