Multiple Select Dropdown List with AJAX can be used to dynamically create multiple Select lists with data from a MySQL table. When the user chooses an option from the Select list, it calls an Ajax function which accesses a PHP file, which will return another Select dropdown according to the option selected.
The STX ExecPipe library provides a convenient C++ interface to execute child programs connected via pipes. It is a front-end to the system calls fork(), pipe(), select(), and execv() and hides all the complexity of these low-level functions. It allows a program to build a sequence of connected children programs with the input and output of the pipe sequence redirected to a file, string, or file descriptor. The library also allows custom asynchronous data processing classes to be inserted into the pipe or placed at the source or sink of the sequence.