Hacking: How to Make Your Own Keylogger in C++ Programming Language by Alan T. Norman

Author:Alan T. Norman
Language: eng
Format: azw3, epub
Published: 2017-02-24T08:00:00+00:00

Just so we know, the little figure above was just written to introduce a new variable type, which we will definitely use later on. The variable type is char. This variable type holds characters such as a dollar sign, a single letter like the one on Line 13 above etc. It is usually utilized with single quotation marks.

Finally, let us go into pointers and files, after which we will start writing our codes for a Keylogger.

Pointers and Files

Pointers:

Basically, a pointer in not just C++ but in other programming languages is used in showing the memory locations of variables. Let us analyze the little program above to help us understand how pointers are used.

Codes from Line 1 to 6 serve the same purpose they have always served in previous codes we have written. A variable num of type int is declared on Line 9. Since a pointer discloses the memory location of a variable, there has to be a variable whose location declared. On Line 10, the pointer is declared. This is done by using a variable type, same as that of the variable, whose location is to be established, followed by an asterisk and finally the name of the pointer. The pointer can have any name, ptr was used in above program.

Now, one Line 9, the pointer is told to point to the variable num. This is done by typing the name of the pointer (ptr) and equating it to an ampersand sign (&) and the variable name (num) with no space in-between. On line 13, a COut statement is written to output num (which we set earlier to a value of 10) and ptr, which will display the memory location of num. As seen in the figure above, on running the code, it displays the value contained in num (10) together with the memory location of the variable (0x28ff18).

Note that on Line 13, if we wanted the pointer to print to console the value contained in the variable, we could simply have put an asterisk before ptr as shown in the figure below.

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