Question

function readMemory(ptr, size)
{
    $.post("readMemory.php", { ptr : ptr, size : size}, function(data)
    {

    });     

    //return "data"
}

Hi, I just want to get data variable as return of readMemory function. Is there any proper way to do this?

Answer 1

The best thing to do is use a callback:

function readMemory(ptr, size, callback)
{
    $.post("readMemory.php", { ptr : ptr, size : size}, function(data)
    {
        callback(data, ptr, size);
    });     
}

(Note that we have ptr and size being passed to callback as well as data; this is usually good practice.)

So code you were expecting to use readMemory like this:

var data = readMemory(ptr, 100);
doSomethingWith(data);
doSomethingElseWith(data);

…will instead look like this:

readMemory(ptr, 100, function(data) {
    doSomethingWith(data);
    doSomethingElseWith(data);
});

This is because your readMemory function only starts the POST operation; it returns before the operation completes (the operation is asynchronous).