在python中发送自定义消息

.py

import win32api, win32con, win32gui
import win32gui_struct
import ctypes
from ctypes import *
GUID_DEVINTERFACE_USB_DEVICE = "{A5DCBF10-6530-11D2-901F-00C04FB951ED}"
WM_RETICULATE_SPLINES =  (win32con.WM_USER + 0x0001)
class MyWindow: 

    def __init__(self):
        win32gui.InitCommonControls()
        self.hinst = win32api.GetModuleHandle(None)
        className = 'MyWndClass'
        message_map = {
        win32con.WM_DESTROY: self.OnDestroy,
        win32con.WM_DEVICECHANGE: self.OnDeviceChange,
        win32con.WM_CREATE: self.OnCreate,
        WM_RETICULATE_SPLINES: self.RETICULATE,
        }
        className = 'MyWndClass'
        wc = win32gui.WNDCLASS()
        wc.style = win32con.CS_HREDRAW | win32con.CS_VREDRAW
        wc.lpfnWndProc = message_map
        wc.lpszClassName = className
        win32gui.RegisterClass(wc)
        style = win32con.WS_OVERLAPPEDWINDOW
        self.hwnd = win32gui.CreateWindow(className,'My win32api app',style,win32con.CW_USEDEFAULT,win32con.CW_USEDEFAULT,300,300,0,0,self.hinst,None)
        # register for a device notification - we pass our service handle
        # instead of a window handle.
        filter = win32gui_struct.PackDEV_BROADCAST_DEVICEINTERFACE(GUID_DEVINTERFACE_USB_DEVICE)
        self.hdn = win32gui.RegisterDeviceNotification(self.hwnd, filter, 4)
        win32gui.ShowWindow(self.hwnd, win32con.SW_SHOW)
        win32gui.UpdateWindow(self.hwnd)
    def OnDestroy(self, hwnd, message, wparam, lparam):
        win32gui.UnregisterDeviceNotification(self.hdn)
        win32gui.PostQuitMessage(0)
        return True
    def OnDeviceChange(self, hwnd, message, wparam, lparam):
        ctypes.windll.user32.MessageBoxW(0, "DeviceChange", "Message", 1)
        return True
    def OnCreate(self, hwnd, message, wparam, lparam):
        ctypes.windll.user32.MessageBoxW(0, "Create", "Message", 1)
        return True
    def RETICULATE(self, hwnd, message, wparam, lparam):
        x = lparam & 0xffff
        y = (lparam >> 16) & 0xffff
        print(x,y)
        return True 

w = MyWindow()
lib = cdll.LoadLibrary(r'D:\repos\Dll_5\Debug\Dll_5.dll')
res = lib.SetHook()
win32gui.PumpMessages()
lib.UnHook()

.dll

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"

#include <windows.h>
#include <stdio.h>
#include <string.h>

#define WM_RETICULATE_SPLINES (WM_USER + 0x0001)

HHOOK tHook;
HMODULE hinstDLL;
static POINT pt;

LRESULT CALLBACK meconnect(int code, WPARAM wParam, LPARAM lParam) {
//    BOOL EnableMouseInPointer = TRUE;
    if (code == HC_ACTION) {
        LPMSG data = (LPMSG)lParam;
        if (data->message == WM_LBUTTONUP) {
            PostMessage(data->hwnd, WM_RETICULATE_SPLINES, data->wParam, data->lParam);

        }
    }
    return(CallNextHookEx(tHook, code, wParam, lParam));
}
extern "C" __declspec(dllexport) BOOL SetHook()
{
    tHook = SetWindowsHookEx(WH_GETMESSAGE, meconnect, hinstDLL, 0);

    if (tHook == NULL)
        return FALSE;
    else
        return TRUE;
}
extern "C" __declspec(dllexport) BOOL UnHook()
{
    return UnhookWindowsHookEx(tHook);
}

BOOL APIENTRY DllMain(HMODULE hModule,
    DWORD  ul_reason_for_call,
    LPVOID lpReserved
)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        hinstDLL = hModule;
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}