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To complete our collection of memory management wrappers, we add two more functions. First, we add the function w_free_all(), which walks the list of allocated memory and deallocates the memory itself as well as the associated memory in the list. This provides us with a catchall function we can call to ensure that memory we may have neglected to free is returned to the heap. The next function, w_memory_init(), is to be called prior to using any of the other memory wrapper functions. This function initializes the global variables that the w_malloc() and w_free() functions use and registers the w_free_all() function to be called at program termination by using the atexit() system call. After a call to w_memory_init(), anytime our program exits normally, by either returning 0 or calling exit(EXIT_SUCCESS), the w_free_all() function is called to ensure we clean up all allocated memory.

Even though you can t execute the page yet, it s worth taking a look at the new elements the new template contains. The admin_product.tpl template contains a single form with the enctype="multipart/form-data" attribute. This attribute is needed for uploading product pictures, and works in conjunction with the HTML code that enables file uploading: ... <input name="ImageUpload" type="file" value="Upload" /> <input type="submit" name="Upload" value="Upload" /><br /> ... At the end of the admin_product.tpl template file, you ll find a similar piece of code used for uploading the thumbnail image of the product: ... <input name="ThumbnailUpload" type="file" value="Upload" /> <input type="submit" name="Upload" value="Upload" /><br /> ... The reaction to clicking these Upload buttons is implemented in the init() method from the AdminProduct class (in presentation/smarty_plugins/function.load_admin_product.php): // If uploading a product picture ... if (isset ($_POST['Upload'])) { /* Check whether we have write permission on the product_images folder */ if (!is_writeable(SITE_ROOT . '/product_images/')) { echo "Can't write to the product_images folder"; exit; } // If the error code is 0, the first file was uploaded ok if ($_FILES['ImageUpload']['error'] == 0) { /* Use the move_uploaded_file PHP function to move the file from its temporary location to the product_images folder */ move_uploaded_file($_FILES['ImageUpload']['tmp_name'], SITE_ROOT . '/product_images/' . $_FILES['ImageUpload']['name']); // Update the product's information in the database

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void w_free_all(void) { memory_list *temp = NULL; while(memory_list_head) { free(memory_list_head->address);

Catalog::SetImage($this->mProductId, $_FILES['ImageUpload']['name']); } // If the error code is 0, the second file was uploaded ok if ($_FILES['ThumbnailUpload']['error'] == 0) { // Move the uploaded file to the product_images folder move_uploaded_file($_FILES['ThumbnailUpload']['tmp_name'], SITE_ROOT . '/product_images/' . $_FILES['ThumbnailUpload']['name']); // Update the product's information in the database Catalog::SetThumbnail($this->mProductId, $_FILES['ThumbnailUpload']['name']); } } The $_FILES superglobal variable is a two-dimensional array that stores information about your uploaded file (or files). If the $_FILES['ImageUpload']['error'] variable is set to 0, then the main image of the product has uploaded successfully and must be handled. The $_FILES['ImageUpload']['tmp_name'] variable stores the temporary file name of the uploaded file on the server, and the $_FILES['ImageUpload']['name'] variable stores the name of the file as specified when uploaded to the server.

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Note A complete description of the $_FILES superglobal is available at http://www.php.net/

temp = memory_list_head->next; free(memory_list_head); memory_list_head = temp; } } void w_memory_init(void) { static int state = 0; if(state != 0) return; state = 1; memory_list_head = NULL; global_memory_count = 0; atexit(w_free_all); }

The next wrapper functions we implement are openssl_init() and openssl_destroy(). These functions allow us to encapsulate the necessary steps in loading and unloading the OpenSSL library, as we discussed in 10. The openssl_init() function also takes on the process of seeding the PRNG within OpenSSL by reading ENTROPY_SIZE bytes from the kernel device /dev/random. We also register the openssl_destroy() function with a call to atexit() to ensure that our process cleans up after itself upon exiting.

The move_uploaded_file PHP function is used to move the file from the temporary location to the product_images folder: /* Use the move_uploaded_file PHP function to move the file from its temporary location to the product_images folder */ move_uploaded_file($_FILES['ImageUpload']['tmp_name'], SITE_ROOT . '/product_images/' . $_FILES['ImageUpload']['name']); After uploading a product picture, the file name must be stored in the database (otherwise, the file upload has no effect): // Update the product's information in the database Catalog::SetImage($this->mProductId, $_FILES['ImageUpload']['name']); As you can see, it s pretty simple to handle file uploads with PHP.

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