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Thus we will need to place the callback method for SetWindowsHookEx in a module. The signature of the callback is a function that accepts three Long arguments and returns a Long. You might have to do a little poking around to discover this information, but I will just provide an empty callback stub for you.
Code helps us decide if the message is for us. The wParam argument contains the actual Windows message constant ad lParam plays the role of pointer to keyboard data.
We will only test Code for a single constant value and the lParam is actually a pointer to the keyboard data. We will come back to this in a moment. Hooking the Keyboard Now that I have the callback method—albeit an empty method—I can hook the keyboard, which means that my method will be called very early in the message handling process.
There are several other kinds of hooks. For example, you can pass constants that indicate that you want to hook the mouse, a hook for debugging, and one that is suggested as being helpful for computer-based training.
The second argument is the AddressOf our KeyboardCallback function. The third argument is the application Windows handle, and we can pass 0 for the thread ID.
The value 0 indicates that the hook is associated with all threads on the desktop. By passing 0 we are hooking the keyboard and can effectively trap keys effecting all applications. With the code we have so far the KeyboardCallback method will be called every time we press a key, whether our application has the focus or not.
The next step is to write some code in the callback that evaluates the received keyboard messages. The code is numbered for convenience, followed by a brief synopsis describing the behavior. The implementation of my KeybaordCallback procedure. If IsHooked Hookstruct Then Code, wParam, lParam Keep in mind that other programs may have keyboard hooks too.
Line 17 returns the value of CallNextHookEx. Notice that I pass it the address of the callback I grabbed when I hooked the keyboard, the code, the wParam, and lParam arguments.
On line 6 if the Code is 0 then I want to handle the message. I implemented a method IsHooked that afforded me a degree of separation between the murky API stuff and the keys I wanted to block. IsHooked is where you and I can decide what key combinations to manage manually.
Both the type and the API method are shown in listing 2. We use long integers to represent pointers, as a pointer is really just a number representing a location in memory. CopyMemory can copy information from one location in memory to a second location. Hence, we use CopyMemory to get the keyboard data from the address pointed to by lParam into our local static variable.
We are basically just copying the keyboard data here. The reason I wrote this code as I have shown you so far is that you could easily reuse this code in any context, over and over without revisiting the low-level API stuff.
It is a good idea when you are hooking low-level operations to keep track of the thing that hooked it before you did. I have to admit that since. Checking for Blocked Key Combinations Tip: Following my implementation all we have to is define IsHooked to return a Boolean that indicates if we want to handle any particular keyboard combination or not.
Listing 3 demonstrates one implementation of IsHooked.Affordable Freelance Business Plan Writers for Hire Online.
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