Let’s see an example where I am assuming “mathlibrary.dll” is a DLL that has many functions to perform the mathematical operation like addition, subtraction…etc. If we require any one of the function, then we must create a function pointer which has the same prototype of the calling ...
The “*” (asterisk) operator is a pointer to a variable. Compare Address’ Code Using pointers allows us to pass variables into functions, and then manipulate the values of these variables inside the function, and have them persist after the function is out of scope. Without pointers, this ...
What the&operator does is retrieve the lvalue (address) ofk, even thoughkis on the right hand side of the assignment operator '=', and copies that to the contents of our pointer ptr. Now, ptr is said to "point to"k. Bear with us now, there is only one more operator we need to ...
As a program runs, calling one function after another, it continuously pushes data onto the stack and pops data off the stack. As a result, the address stored in the stack pointer register is constantly changing. When a new data element is pushed onto the top of a stack, the stack point...
function to associate a file pointer with a file descriptor. this allows you to use familiar file operations like fread() or fwrite() on the file pointer instead of using lower level read and write operations directly on the file descriptor. can i perform simultaneous read and write operations...
In this case, the function signature is a pointer to an integer. ctypes will allow you to specify this using the following code: Python >>> add_one = add_lib.add_one >>> add_one.argtypes = [ctypes.POINTER(ctypes.c_int)] In this code, you’re setting the function signature to...
AtlAxGetHostReturns theIUnknowninterface pointer of the host object connected to a window. AtlAxWinInitInitializes the control-hosting code. AtlAxWinTermUninitializes the control-hosting code. TheHWNDparameters in the first three functions must be an existing window of (almost) any type. If you cal...
Buried deep in the System V Application Binary Interface document for the AMD64 Architecture, there is a footnote on page 24 that says, “%r10is used for passing a function’s static chain pointer.” What is a static chain pointer?
What is a program counter (PC)? The program counter, also known as the instruction pointer or simply PC, is a fundamental component of a computer's central processing unit (CPU). It is a special register that keeps track of the memory address of the next instruction to be executed in a...
For example, if you have bound the themousemoveevent and a user is wildly waving their pointer around the screen, it’s not a good idea to translate each mouse move event into a client event. Instead, you should define an interval at which the mouse position should be sent and if the ...