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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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213<div class="main">
214
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]215<h1>Module blob Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]216<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]217
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]218<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]219<div class="doc-section">
220
221<p>BlobToImage() implements direct to memory image formats. It returns the blob as an image.</p>
222
223<p>The format of the BlobToImage method is:</p>
224
225<pre class="code">
226 Image *BlobToImage(const ImageInfo *image_info,const void *blob,
227 const size_t length,ExceptionInfo *exception)
228</pre>
229
230<p>A description of each parameter follows:</p>
231
232<h5>image_info</h5>
233<p>the image info.</p>
234
235<h5>blob</h5>
236<p>the address of a character stream in one of the image formats understood by ImageMagick.</p>
237
238<h5>length</h5>
239<p>This size_t integer reflects the length in bytes of the blob.</p>
240
241<h5>exception</h5>
242<p>return any errors or warnings in this structure.</p>
243
244 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]245<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]246<div class="doc-section">
247
248<p>FileToImage() write the contents of a file to an image.</p>
249
250<p>The format of the FileToImage method is:</p>
251
252<pre class="code">
253 MagickBooleanType FileToImage(Image *,const char *filename)
254</pre>
255
256<p>A description of each parameter follows:</p>
257
258<h5>image</h5>
259<p>the image.</p>
260
261<h5>filename</h5>
262<p>the filename.</p>
263
264 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]265<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]266<div class="doc-section">
267
268<p>GetBlobProperties() returns information about an image blob.</p>
269
270<p>The format of the GetBlobProperties method is:</p>
271
272<pre class="code">
273 const struct stat *GetBlobProperties(const Image *image)
274</pre>
275
276<p>A description of each parameter follows:</p>
277
278<h5>image</h5>
279<p>the image.</p>
280
281 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]282<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]283<div class="doc-section">
284
cristyda16f162011-02-19 23:52:17 +0000[diff] [blame]285<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]286
287<p>The format of the ImageToBlob method is:</p>
288
289<pre class="code">
290 unsigned char *ImageToBlob(const ImageInfo *image_info,Image *image,
291 size_t *length,ExceptionInfo *exception)
292</pre>
293
294<p>A description of each parameter follows:</p>
295
296<h5>image_info</h5>
297<p>the image info.</p>
298
299<h5>image</h5>
300<p>the image.</p>
301
302<h5>length</h5>
303<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>
304
305<h5>exception</h5>
306<p>return any errors or warnings in this structure.</p>
307
308 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]309<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]310<div class="doc-section">
311
312<p>ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.</p>
313
314<p>The format of the ImageToFile method is:</p>
315
316<pre class="code">
317 MagickBooleanType ImageToFile(Image *image,char *filename,
318 ExceptionInfo *exception)
319</pre>
320
321<p>A description of each parameter follows:</p>
322
323<h5>image</h5>
324<p>the image.</p>
325
326<h5>filename</h5>
327<p>Write the image to this file.</p>
328
329<h5>exception</h5>
330<p>return any errors or warnings in this structure.</p>
331
332 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]333<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]334<div class="doc-section">
335
336<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>
337
338<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>
339
340<p>The format of the ImagesToBlob method is:</p>
341
342<pre class="code">
343 unsigned char *ImagesToBlob(const ImageInfo *image_info,Image *images,
344 size_t *length,ExceptionInfo *exception)
345</pre>
346
347<p>A description of each parameter follows:</p>
348
349<h5>image_info</h5>
350<p>the image info.</p>
351
352<h5>images</h5>
353<p>the image list.</p>
354
355<h5>length</h5>
356<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>
357
358<h5>exception</h5>
359<p>return any errors or warnings in this structure.</p>
360
361 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]362<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]363<div class="doc-section">
364
365<p>InjectImageBlob() injects the image with a copy of itself in the specified format (e.g. inject JPEG into a PDF image).</p>
366
367<p>The format of the InjectImageBlob method is:</p>
368
369<pre class="code">
370 MagickBooleanType InjectImageBlob(const ImageInfo *image_info,
371 Image *image,Image *inject_image,const char *format,
372 ExceptionInfo *exception)
373</pre>
374
375<p>A description of each parameter follows:</p>
376
377<h5>image_info</h5>
378<p>the image info..</p>
379
380<h5>image</h5>
381<p>the image.</p>
382
383<h5>inject_image</h5>
384<p>inject into the image stream.</p>
385
386<h5>format</h5>
387<p>the image format.</p>
388
389<h5>exception</h5>
390<p>return any errors or warnings in this structure.</p>
391
392 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]393
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