Can someone explain me this code?

Question

1.00/5 (1 vote)

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This is code is not descriptive enough for beginners like me please help.

What I have tried:

import win32con
import win32api
import win32gui
import sys
import time

def log_info(msg):
    """ Prints """
    print msg
    f = open("c:\\test.log", "a")
    f.write(msg + "\n")
    f.close()

def wndproc(hwnd, msg, wparam, lparam):
    log_info("wndproc: %s" % msg)

if __name__ == "__main__":
    log_info("*** STARTING ***")
    hinst = win32api.GetModuleHandle(None)
    wndclass = win32gui.WNDCLASS()
    wndclass.hInstance = hinst
    wndclass.lpszClassName = "testWindowClass"
    messageMap = { win32con.WM_QUERYENDSESSION : wndproc,
                   win32con.WM_ENDSESSION : wndproc,
                   win32con.WM_QUIT : wndproc,
                   win32con.WM_DESTROY : wndproc,
                   win32con.WM_CLOSE : wndproc }

    wndclass.lpfnWndProc = messageMap

    try:
        myWindowClass = win32gui.RegisterClass(wndclass)
        hwnd = win32gui.CreateWindowEx(win32con.WS_EX_LEFT,
                                     myWindowClass, 
                                     "testMsgWindow", 
                                     0, 
                                     0, 
                                     0, 
                                     win32con.CW_USEDEFAULT, 
                                     win32con.CW_USEDEFAULT, 
                                     win32con.HWND_MESSAGE, 
                                     0, 
                                     hinst, 
                                     None)
    except Exception, e:
        log_info("Exception: %s" % str(e))


    if hwnd is None:
        log_info("hwnd is none!")
    else:
        log_info("hwnd: %s" % hwnd)

    while True:
        win32gui.PumpWaitingMessages()
        time.sleep(1)

Posted 26-Jul-21 20:26pm

Member 14925860

Updated 26-Jul-21 22:23pm

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OriginalGriff · Answer 1 · 2021-07-26T20:30:00

Solution 1

Do you have any idea how much work explaining code line by line is?
Every single line needs a paragraph of explanation! For example:

int next = r.Next();

Create a new variable called "next" which can hold a integer value. From the previously declared Random instance "r", call the "Next" method to get a new random number, and assign it to the "next" variable.

Can you imagine how long it would take us to explain even a very short code fragment like your example, line by line?

No. It is not going to happen. If you have a specific problem, then ask a question about it. But think first - would you want to sit down for 45 minutes and type up a line-by-line description for no good reason?

Posted 26-Jul-21 20:30pm

OriginalGriff

Comments

Member 14925860 27-Jul-21 2:52am

@OriginalGriff Just a single line of description will do, like int next; --> /*Declare an integer with name next*/

OriginalGriff 27-Jul-21 3:08am

Oh, so now you know how to read a line of code and explain it?
OK. Explain to me what this line of code does in a one line comment:

        hwnd = win32gui.CreateWindowEx(win32con.WS_EX_LEFT,
                                     myWindowClass, 
                                     "testMsgWindow", 
                                     0, 
                                     0, 
                                     0, 
                                     win32con.CW_USEDEFAULT, 
                                     win32con.CW_USEDEFAULT, 
                                     win32con.HWND_MESSAGE, 
                                     0, 
                                     hinst, 
                                     None)

Member 14925860 27-Jul-21 4:02am

It creates a window

OriginalGriff 27-Jul-21 4:34am

So if you can work that out for yourself, what is stopping you doing the rest?
Or do you think that "creates a window" is a little ... um ... incomplete?

Richard MacCutchan · Answer 2 · 2021-07-26T22:23:00

Solution 2

Quote:
This is code is not descriptive enough for beginners like me

And that is a very good reason why you should keep away from it. If you want to learn Python then go to The Python Tutorial — Python 3.9.6 documentation[^].

Posted 26-Jul-21 22:23pm

Richard MacCutchan