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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Read or Write Binary Large OBjects</title>
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193
194<div class="main">
195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h1>Module blob Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<p class="navigation-index">[<a href="#BlobToImage">BlobToImage</a> &bull; <a href="#FileToImage">FileToImage</a> &bull; <a href="#GetBlobProperties">GetBlobProperties</a> &bull; <a href="#ImageToBlob">ImageToBlob</a> &bull; <a href="#ImageToFile">ImageToFile</a> &bull; <a href="#ImagesToBlob">ImagesToBlob</a> &bull; <a href="#InjectImageBlob">InjectImageBlob</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="BlobToImage">BlobToImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]200<div class="doc-section">
201
202<p>BlobToImage() implements direct to memory image formats. It returns the blob as an image.</p>
203
204<p>The format of the BlobToImage method is:</p>
205
206<pre class="code">
207 Image *BlobToImage(const ImageInfo *image_info,const void *blob,
208 const size_t length,ExceptionInfo *exception)
209</pre>
210
211<p>A description of each parameter follows:</p>
212
213<h5>image_info</h5>
214<p>the image info.</p>
215
216<h5>blob</h5>
217<p>the address of a character stream in one of the image formats understood by ImageMagick.</p>
218
219<h5>length</h5>
220<p>This size_t integer reflects the length in bytes of the blob.</p>
221
222<h5>exception</h5>
223<p>return any errors or warnings in this structure.</p>
224
225 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]226<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="FileToImage">FileToImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]227<div class="doc-section">
228
229<p>FileToImage() write the contents of a file to an image.</p>
230
231<p>The format of the FileToImage method is:</p>
232
233<pre class="code">
234 MagickBooleanType FileToImage(Image *,const char *filename)
235</pre>
236
237<p>A description of each parameter follows:</p>
238
239<h5>image</h5>
240<p>the image.</p>
241
242<h5>filename</h5>
243<p>the filename.</p>
244
245 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]246<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="GetBlobProperties">GetBlobProperties</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]247<div class="doc-section">
248
249<p>GetBlobProperties() returns information about an image blob.</p>
250
251<p>The format of the GetBlobProperties method is:</p>
252
253<pre class="code">
254 const struct stat *GetBlobProperties(const Image *image)
255</pre>
256
257<p>A description of each parameter follows:</p>
258
259<h5>image</h5>
260<p>the image.</p>
261
262 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]263<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImageToBlob">ImageToBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]264<div class="doc-section">
265
cristyda16f162011-02-19 23:52:17 +0000[diff] [blame^]266<p>ImageToBlob() implements direct to memory image formats. It returns the image as a formatted blob and its length. The magick member of the Image structure determines the format of the returned blob (GIF, JPEG, PNG, etc.). This method is the equivalent of WriteImage(), but writes the formatted "file" to a memory buffer rather than to an actual file.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]267
268<p>The format of the ImageToBlob method is:</p>
269
270<pre class="code">
271 unsigned char *ImageToBlob(const ImageInfo *image_info,Image *image,
272 size_t *length,ExceptionInfo *exception)
273</pre>
274
275<p>A description of each parameter follows:</p>
276
277<h5>image_info</h5>
278<p>the image info.</p>
279
280<h5>image</h5>
281<p>the image.</p>
282
283<h5>length</h5>
284<p>This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.</p>
285
286<h5>exception</h5>
287<p>return any errors or warnings in this structure.</p>
288
289 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]290<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImageToFile">ImageToFile</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]291<div class="doc-section">
292
293<p>ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.</p>
294
295<p>The format of the ImageToFile method is:</p>
296
297<pre class="code">
298 MagickBooleanType ImageToFile(Image *image,char *filename,
299 ExceptionInfo *exception)
300</pre>
301
302<p>A description of each parameter follows:</p>
303
304<h5>image</h5>
305<p>the image.</p>
306
307<h5>filename</h5>
308<p>Write the image to this file.</p>
309
310<h5>exception</h5>
311<p>return any errors or warnings in this structure.</p>
312
313 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]314<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImagesToBlob">ImagesToBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]315<div class="doc-section">
316
317<p>ImagesToBlob() implements direct to memory image formats. It returns the image sequence as a blob and its length. The magick member of the ImageInfo structure determines the format of the returned blob (GIF, JPEG, PNG, etc.)</p>
318
319<p>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.</p>
320
321<p>The format of the ImagesToBlob method is:</p>
322
323<pre class="code">
324 unsigned char *ImagesToBlob(const ImageInfo *image_info,Image *images,
325 size_t *length,ExceptionInfo *exception)
326</pre>
327
328<p>A description of each parameter follows:</p>
329
330<h5>image_info</h5>
331<p>the image info.</p>
332
333<h5>images</h5>
334<p>the image list.</p>
335
336<h5>length</h5>
337<p>This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.</p>
338
339<h5>exception</h5>
340<p>return any errors or warnings in this structure.</p>
341
342 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]343<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="InjectImageBlob">InjectImageBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]344<div class="doc-section">
345
346<p>InjectImageBlob() injects the image with a copy of itself in the specified format (e.g. inject JPEG into a PDF image).</p>
347
348<p>The format of the InjectImageBlob method is:</p>
349
350<pre class="code">
351 MagickBooleanType InjectImageBlob(const ImageInfo *image_info,
352 Image *image,Image *inject_image,const char *format,
353 ExceptionInfo *exception)
354</pre>
355
356<p>A description of each parameter follows:</p>
357
358<h5>image_info</h5>
359<p>the image info..</p>
360
361<h5>image</h5>
362<p>the image.</p>
363
364<h5>inject_image</h5>
365<p>inject into the image stream.</p>
366
367<h5>format</h5>
368<p>the image format.</p>
369
370<h5>exception</h5>
371<p>return any errors or warnings in this structure.</p>
372
373 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]374
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