c++ - 修改鼠标移动的问题

Question

我现在正在玩 windows hooks。我设置了一个全局低级鼠标钩子(Hook)我想反转鼠标移动。为此我有几个方法(我希望这是正确的，我的英语不是很好，抱歉)。第一个是修改lParam参数，用CallNextHookEx函数转发:

LRESULT CALLBACK MouseInvertProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    MSLLHOOKSTRUCT* ms = NULL;
    int dx = 0; //delta x
    int dy = 0; //delta y
    if(nCode == HC_ACTION)
    {
        if(wParam == WM_MOUSEMOVE)
        {
            ms = (MSLLHOOKSTRUCT*)lParam;
            dx = ms->pt.x - g_oldMousePos.x;
            dy = ms->pt.y - g_oldMousePos.y;
            ms->pt.x = ms->pt.x - 2 * dx;
            ms->pt.y = ms->pt.y - 2 * dy;
            GetCursorPos(&g_oldMousePos);

            return CallNextHookEx(g_MouseInvertHook,nCode,wParam, (LPARAM)ms);          
        }
        else
            return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
    }
    return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);            
}

但这一点作用都没有。有人知道为什么吗？
第二次尝试是使用修改后的鼠标坐标提供输入:

LRESULT CALLBACK MouseInvertProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    MSLLHOOKSTRUCT* ms = NULL;
    int dx = 0; //delta x
    int dy = 0; //delta y
    if(nCode == HC_ACTION)
    {
        if(wParam == WM_MOUSEMOVE)
        {
            ms = (MSLLHOOKSTRUCT*)lParam;
            dx = ms->pt.x - g_oldMousePos.x;
            dy = ms->pt.y - g_oldMousePos.y;
            ms->pt.x = ms->pt.x - 2 * dx;
            ms->pt.y = ms->pt.y - 2 * dy;
            GetCursorPos(&g_oldMousePos);

            if(!g_artificialma) //g_artificialma is true when i created a artificial mouse input.
            {
                g_artificialma = true;
                mouse_event(MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE, ms->pt.x, ms->pt.y, NULL, NULL);
                return 1;                           
            }
            else
            {               
                g_artificialma = false;
                return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
            }           
        }
        else
            return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
    }
    return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
}           

我想使用 g_artificialma 变量来防止无限循环，因为当我调用 mouse_event 时会调用 hookproc。
但这样一来，我的鼠标就卡在了屏幕的左上角。

最后的尝试是简单地调用 SetCursorPos 函数:

LRESULT CALLBACK MouseInvertProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    MSLLHOOKSTRUCT* ms = NULL;
    int dx = 0; //delta x
    int dy = 0; //delta y
    if(nCode == HC_ACTION)
    {
        if(wParam == WM_MOUSEMOVE)
        {
            ms = (MSLLHOOKSTRUCT*)lParam;
            dx = ms->pt.x - g_oldMousePos.x;
            dy = ms->pt.y - g_oldMousePos.y;
            ms->pt.x = ms->pt.x - 2 * dx;
            ms->pt.y = ms->pt.y - 2 * dy;
            GetCursorPos(&g_oldMousePos);

            SetCursorPos(ms->pt.x, ms->pt.y);                       
        }
        else
            return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
    }
    return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);            
}

这很好用，但是在 3d 应用程序中这会导致奇怪的鼠标移动
而且我认为这种方式真的很难看，因为我阻止了其他应用程序安装的其他 Hook 。

那么您有什么建议可以以良好的工作和干净的方式解决这个问题(也许没有 windows hooks)？

Answer 1

您的“最后一次尝试”代码在我的测试中完全没有效果:

#define _WIN32_WINNT 0x0501

#include <iostream>
#include <windows.h>
using namespace std;

HHOOK g_MouseInvertHook;
POINT g_oldMousePos;
LRESULT CALLBACK MouseInvertProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    MSLLHOOKSTRUCT* ms = NULL;
    int dx = 0; //delta x
    int dy = 0; //delta y
    if(nCode == HC_ACTION)
    {
        if(wParam == WM_MOUSEMOVE)
        {
            ms = (MSLLHOOKSTRUCT*)lParam;
            dx = ms->pt.x - g_oldMousePos.x;
            dy = ms->pt.y - g_oldMousePos.y;
            ms->pt.x = ms->pt.x - 2 * dx;
            ms->pt.y = ms->pt.y - 2 * dy;
            GetCursorPos(&g_oldMousePos);

            SetCursorPos(ms->pt.x, ms->pt.y);                       
        }
        else
            return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);
    }
    return CallNextHookEx(g_MouseInvertHook, nCode, wParam, lParam);            
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
  GetCursorPos(&g_oldMousePos);
  g_MouseInvertHook = SetWindowsHookEx(WH_MOUSE_LL, MouseInvertProc, hInstance, 0);
  MSG msg;
  while(GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return msg.wParam;
}

你能举一个应用程序的小例子(比如我的)，它只使用你的那个功能并给出你描述的结果吗？