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The function ssl_client_connect() takes a host name and port as arguments, and if it is successful, it returns a new SSL connection to that host on the specified port. This encapsulates all the code necessary to initiate and negotiate that connection, such that upon successful return, communication can begin immediately over the returned connection. We implement this function using the BIO method of connection handling, making our code slightly easier to read and more portable.

SSL * ssl_client_connect(const char *host, const char *port) { SSL_METHOD *my_ssl_method; SSL_CTX *my_ssl_ctx; SSL *my_ssl; BIO *my_bio; char *host_port; host_port = w_malloc(strlen(host) + strlen(port) + 2); sprintf(host_port,"%s:%s",host,port); my_ssl_method = TLSv1_client_method(); if((my_ssl_ctx = SSL_CTX_new(my_ssl_method)) == NULL) { return NULL; } if((my_ssl = SSL_new(my_ssl_ctx)) == NULL) { SSL_CTX_free(my_ssl_ctx); return NULL; } if((my_bio = BIO_new_connect(host_port)) == NULL) { SSL_free(my_ssl); w_free(host_port); return NULL; } if(BIO_do_connect(my_bio) <=0) { SSL_free(my_ssl); BIO_free(my_bio); w_free(host_port); return NULL; } SSL_set_bio(my_ssl,my_bio,my_bio); if(SSL_connect(my_ssl) <= 0) { SSL_free(my_ssl);

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The function first determines whether the product mentioned by inProductId exists in the cart referred to by the inCartId It does this by testing whether an (inCartId, inProductId) pair is in the shopping_cart table If the product is in the cart, shopping_cart_add_product updates the current product quantity in the shopping cart by adding one unit Otherwise, shopping_cart_add_product creates a new record for the product in shopping_cart with a default quantity of 1 but not before checking whether the mentioned inProductId is valid The NOW() PostgreSQL function retrieves the current date and manually populates the added_on field 4 Use the query tool to execute the following code, which creates the shopping_cart_update function in your hatshop database: -- Create shopping_cart_update function CREATE FUNCTION shopping_cart_update(CHAR(32), INTEGER[], INTEGER[]) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; inProductIds ALIAS FOR $2; inQuantities ALIAS FOR $3; BEGIN FOR i IN array_lower(inQuantities, 1)..

A developer could purchase this tool and add it to the Toolbox in the Visual Basic IDE The developer could then simply drag the resize control onto the form, and the form and the controls it contained would resize proportionally By version 60, Visual Basic had evolved into a robust and industrial-strength programming language with an extremely large and dedicated developer base Nevertheless, as strong as Visual Basic had become as a programming language, many programmers felt it had one major shortcoming They considered Visual Basic to be an object-like programming language not a true object-oriented programming language Although Visual Basic 40 gave developers the ability to create classes and to package the classes in reusable components, Visual Basic did not incorporate basic OOP features such as inheritance and method overloading Without these features, developers were severely limited in their ability to construct complex distributed software systems.

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array_upper(inQuantities, 1) LOOP IF inQuantities[i] > 0 THEN UPDATE shopping_cart SET quantity = inQuantities[i], added_on = NOW() WHERE cart_id = inCartId AND product_id = inProductIds[i]; ELSE PERFORM shopping_cart_remove_product(inCartId, inProductIds[i]); END IF; END LOOP; END; $$; The shopping_cart_update function is used when you want to update the quantity of one or more existing shopping cart items This function is called when the visitor clicks the Update button shopping_cart_update receives as parameters two array values: inProductIds and inQuantities The value of inQuantities[i] represents the new quantity for the product specified by inProductIDs[i] If inQuantities[i] is zero or less, shopping_cart_update removes the mentioned product from the shopping cart Otherwise, it updates the quantity of the product in the shopping cart and also updates added_on to accurately reflect the time the record was last modified.

w_free(host_port); return NULL; } w_free(host_port); return my_ssl; }

Updating the added_on field is particularly useful for the administration page, when you ll want to remove shopping carts that haven t been updated in a long time 5 Use the query tool to execute this code, which creates the shopping_cart_remove_product function in your hatshop database: -- Create shopping_cart_remove_product function CREATE FUNCTION shopping_cart_remove_product(CHAR(32), INTEGER).

When providing a username to the server, we could simply prompt the user for the username. However, for our purposes it would seem that assuming the username of the person who ran the client would provide for an interesting divergence into extending an application. As a result, we implement the function getUsername(), which uses the glibc functions getpwent() and getuid() to locate and return our username in the NSS passwd database.

const char *getUsername(void) { static char *username_buffer = NULL; uid_t my_uid; struct passwd *current_pwent = NULL; my_uid = getuid(); current_pwent = getpwent(); if(username_buffer != NULL) w_free(username_buffer); username_buffer = NULL; } while(current_pwent && !username_buffer) { if(current_pwent->pw_uid == my_uid) { username_buffer = (char *)w_malloc(strlen(current_pwent->pw_name) + 1); strncpy(username_buffer,current_pwent->pw_name, strlen(current_pwent->pw_name) + 1); } current_pwent = getpwent(); } endpwent(); return username_buffer; } {

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