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

#pragma comment(lib,"Kernel32.lib")
#pragma comment(lib,"shlwapi.lib")
#pragma comment(linker, "/SECTION:.shared,RWS")

using namespace std;

DWORD  dwPID;


LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    if (message == WM_DESTROY) {
        PostQuitMessage(0);
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
};
HINSTANCE hinst;

int main()
{
    Sleep(3000); //用作选择file explorer，可以用定时器代替
    CHAR lpFileName[MAX_PATH] = { 0 };
    HANDLE hProcess;
    HWND   hwnd = GetForegroundWindow();
    DWORD threadID = GetWindowThreadProcessId(hwnd, &dwPID);
    hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, false, dwPID);
    GetModuleFileNameEx(hProcess, NULL, lpFileName, _countof(lpFileName));
    PathStripPath(lpFileName);

    if (_tcscmp(_T("explorer.exe"), lpFileName) == 0) {
        _tprintf(_T("explorer window found"));
    }
    else {
        _tprintf(_T("foreground window was not explorer window"));
    }
    CloseHandle(hProcess);

    HINSTANCE hinstDLL = LoadLibrary(TEXT("DLL.dll")); //这里需要新创建的dll的路径
    HHOOK(*AttachHookProc)(DWORD);
    AttachHookProc = (HHOOK(*)(DWORD)) GetProcAddress(hinstDLL, "AttachHook");


    HHOOK HOOK = AttachHookProc(threadID);

    int err = GetLastError();//检测是否有错误

    MSG msg = {};

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

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

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

HMODULE thisModule;
HHOOK hook;
LRESULT CALLBACK LaunchListener(int nCode, WPARAM wParam, LPARAM lParam);

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

#ifdef __cplusplus    //If used by C++ code.
extern "C" {        //we need to export the C interface
#endif
    _declspec(dllexport) HHOOK AttachHook(DWORD threadID) {
        hook = SetWindowsHookEx(WH_MOUSE, LaunchListener, thisModule, threadID); 

        return hook;
    }
#ifdef __cplusplus
}
#endif
LRESULT CALLBACK LaunchListener(int nCode, WPARAM wParam, LPARAM lParam) {
    // process event here
    if (nCode >= 0)
    {
        switch (wParam & 0x0001)
        {
        case MK_LBUTTON:
            {
                MessageBox(NULL, TEXT("Click"), NULL, MB_OK);
            }
            break;
        }
    }
    
    return CallNextHookEx(NULL, nCode, wParam, lParam);
}