win32-WH_KEYBOARD的使用

我们使用WH_KEYBOARD来禁用记事本的ALT的按键

.cpp

#include <Windows.h>
#include <stdio.h>
#include <tchar.h>

unsigned long GetTargetThreadIdFromWindow(const char* className, const char* windowName)
{
    HWND targetWnd;
    HANDLE hProcess;
    unsigned long processID = 0;

    targetWnd = FindWindow(className, windowName);
    return GetWindowThreadProcessId(targetWnd, &processID);
}

int main() {
    unsigned long threadID = GetTargetThreadIdFromWindow("Notepad", "renote.txt - Notepad");
    printf("TID: %i", threadID);
    
    HINSTANCE hinst = LoadLibrary(_T("Mydll.dll"));

    if (hinst) {
        typedef void (*Install)(unsigned long);
        typedef void (*Uninstall)();

        Install install = (Install)GetProcAddress(hinst, "install");
        Uninstall uninstall = (Uninstall)GetProcAddress(hinst, "uninstall");

        install(threadID);

        MSG msg = {};

        while (GetMessage(&msg, NULL, 0, 0)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        uninstall();
    }

    return 0;
}

.mydll

// dllmain.cpp : Defines the entry point for the DLL application.
#include "pch.h"
#include <windows.h>
#include <iostream>
#include <stdio.h>

HINSTANCE hinst;
#pragma data_seg(".shared")
HHOOK hhk;
#pragma data_seg()

LRESULT CALLBACK wireKeyboardProc(int code, WPARAM wParam, LPARAM lParam) {
    if (code >= 0)
    {       
        switch (wParam)
        {
             case VK_MENU:
             {
                 return 1;
             }
        }
    }
    return CallNextHookEx(hhk, code, wParam, lParam);
}

extern "C" __declspec(dllexport) void install(unsigned long threadID) {
    hhk = SetWindowsHookEx(WH_KEYBOARD, wireKeyboardProc, hinst, threadID);
}
extern "C" __declspec(dllexport) void uninstall() {
    UnhookWindowsHookEx(hhk);
}

BOOL WINAPI DllMain(__in HINSTANCE hinstDLL, __in  DWORD fdwReason, __in  LPVOID lpvReserved) {
    hinst = hinstDLL;
    return TRUE;
}