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Sometimes you can fetch web pages from other servers quite easily using the file_get_ contents() function, but it only works for pages that can be fetched with a GET request When a POST request is required, you either have to use a web form and submit it to the page in question, or, more simply, you can use mod curl, as in this plug-in This plug-in starts off by using the substr() function to truncate the string $text to 140 characters (the maximum number of characters supported by Twitter) if it s longer than that It does this to ensure that the string won t be truncated by Twitter, because later the code will check to see whether the status string of the user s most recent message is the same as $text If so, then a status update has occurred If $text was ever greater than 140 characters in length, then Twitter would truncate it before posting the Tweet, and so the returned status message would not be the same as the original $text Therefore, the plug-in ensures that Twitter never has to truncate any $text Next, the variable $url is set to the Twitter status update API page Then, all the parameters required for the call to curl_exec() are assigned their correct values, starting with setting the CURLOPT_URL option to $url and the CURLOP_CONNECTTIMEOUT option to 2 The CURLOPT_RETURNTRANSFER option is then set to 1 to prevent curl_exec() from directly outputting the result of making the POST request Instead, the result is returned by the function, in place of the normal success value of TRUE Then the CURLOP_POST option is set to 1, indicating that a POST request is to be made, and the CURLOPT_POSTFIELDS option is given the string "status=$text", while CURLOPT_ USERPWD is given the value "$user:$pass" to set up the login details Finally, curl_exec() is called, passing the handle $curl_handle, which was created at the start, and then curl_close() is called to close the connection The result of the call is now in $result This will be FALSE for failure, or on success it will be a string of XML data containing the result returned by the called URL If the Tweet was successful, there will be various elements in the XML, but notably the <text> field will contain the contents of the most recent status update (or Tweet) To examine this field, a new XML object is created from $result in $xml using the simplexml_load_string() function If it cannot be created, then the value FALSE is returned, otherwise the object property $xml->text is compared with the value of $text, and if they are the same, the Tweet was successful and a value of TRUE is returned Otherwise, FALSE is returned to indicate failure.

This listing is more complicated than listing 10.5, although a large amount of the code is about managing the surface for the camera preview. The first line is the start of an implementation of the method onKeyDown B, which checks to see whether the center key on the dpad was pressed. If it was, we set up the creation of a file, and by using the ImageCaptureCallback, which we ll define in listing 10.7, we create an Outputstream to write our image data to C, including not only the image but the filename and other metadata. Next, we call the method takePicture() and pass to it the three callbacks mShutterCallback, mPictureCallbackRaw, and camDemo. mPictureCallbackRaw is our raw image and camDemo writes the image to a file on the SD card D, as you can see in the following listing.

The pwmout documentation in the manual includes formulas to compute the values of period and duty cycle for the specific waveform you want to generate, but it s easier to use the Pwmout Wizard in the Programming Editor; just choose PICAXE | Wizards | Pwmout in the menu structure Be sure to select the clock speed that you re using, or the wizard s values will be way off the mark

To send a Tweet to your Twitter account, just call the plug-in like this:

public class ImageCaptureCallback implements PictureCallback { private OutputStream filoutputStream; public ImageCaptureCallback(OutputStream filoutputStream) { this.filoutputStream = filoutputStream; } public void onPictureTaken(byte[] data, Camera camera) { try { this.filoutputStream.write(data); this.filoutputStream.flush(); this.filoutputStream.close(); } catch(Exception ex) { ex.printStackTrace(); } } }

Here, the class implements the PictureCallback interface and provides two methods. The constructor creates a stream to write data to, and the second method, onPictureTaken, takes binary data and writes to the SD card as a JPEG.

$user $pass $text $result = = = = 'twitteruser'; 'twitterpass'; 'Hello world'; PIPHP_SendTweet($user, $pass, $text);