Each UI controls holds different types of information in it thus the exchange of data should be in different types of variables. These APIs have a common format of arguments and the dialog window handle is the first argument and then the control ID. There are Win32 API to retrieve values from the UI controls. These child controls are identified by an control identification number or control ID. This mechanism is called dialog data exchange in Win32/MFC programming practices.Ī dialog window is a top-level window and dialog UI controls like button, editbox, checkbox, combobox, radio buttons, list box are child windows. Again when we require to take input from the user, we display dialogs, and the input is given to the user interfaces and then exchanged to the variables. Programming variables types like a string, integer, boolean etc are exchanged to the graphical user interface for display purposes. So we use a graphical dialog box or form window for the interactions and exchanges.
Graphical user interface-based programmings like Win32 programming using C and MFC programming with C++, cannot use the console for user interaction. These two functions primarily act as the data exchange routine in console-based C applications. The input from the user is taken from the console using scanf() function. The output of the variable to the user is generally done through printf() which basically converts data type to a string and then displays it in the text console. In C/C++ programming, we hold data in a variable and they are processed in the program.
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