int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR pScmdline, int iCmdshow)
In this line, are these statements about the call parameters correct?
HINSTANCE is a class and hInstance and hPrevInstance are objects, PSTR is a class and pScmdline is an object and int is a class and iCmdshow is an object ?
Firstly, an object is a location in memory having a value and possibly referenced by an identifier. An object can be a variable, a data structure, or a function.
A class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions, methods).
int WINAPI WinMain:
- it's the function used as EntryPoint of Win32 projects.
HINSTANCE = Handle INSTANCE:
- it's a void pointer(void, int, bool... are types), not a class, is the base address of the module in memory.
hInstance and hPrevInstance:
- are parameters of the WinMain function, hInstance is the handle to the current instance of the application, and the hPrevInstance is a handle to the previous instance of the application, hPrevInstance is always NULL. yes, this is an object because it's in some location in the memory.
PSTR:
- it's a pointer of a 8bit string
pScmdline:
- The command line for the application. it's also an object.
int:
- Is a type not a class.
iCmdshow:
- it controls how the window is to be shown (minimized, maximized, hidden...), it's an object of a type.
see this question about the difference between types and class: What is the difference between Type and Class?
HINSTANCE is void * which is not a class, neither is int a class. They are types.
Please see this link for a definition of these types.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx
