获取光标位置和 hwnd 的低级鼠标钩子

Question

我有一个简短的问题。我从 MSDN 创建了一个标准 window 和 window api，创建了一个 window 站点。我想让程序做的是更改 window 当我按下键盘上的某个键时鼠标光标所在的标题。为此，我安装了一个低级鼠标挂钩，如下所示：

LRESULT CALLBACK LowLevelMouseProc(__in  int nCode, __in  WPARAM wParam, __in  LPARAM lParam) {
    MSLLHOOKSTRUCT* p = (MSLLHOOKSTRUCT*)lParam;
    HWND hiWnd = WindowFromPoint(p->pt); //Get a handle to the top-most window
    ScreenToClient(hiWnd, &p->pt); //Converts the cursor position from screen to the specified window
    char buf[33];

    switch (wParam) {

    case WM_MOUSEMOVE:
        snprintf(buf, sizeof(buf) - 1, "X:%ld, Y:%ld", p->pt.x, p->pt.y); //Put the cursor coordinates into a char buffer
        SendMessage(hiWnd, WM_SETTEXT, 0, (LPARAM)buf); //Send a message to the other window to change the title
        break;
    }
    return CallNextHookEx(0, nCode, wParam, lParam);
}

调用鼠标挂钩后，只有我的程序会更改文本。另外，文字是一堆汉字，不是一两个，而是一堆这样的：

藡覶 跾 瑍痸碚 齫儽戃 羭聧蔩, 圪妀 跾 鶀嚵巆 堔埧娾 爂犤繵 摿斠榱 軥軱逴 潫 徖梜, 薍薝

我是否必须弄乱前景 window 而获得背景 window？或者 window 当前鼠标位置在哪里？我假设

ScreenToClient(hiWnd, &p->pt)

感谢大家的帮助！

Answer 1

What I want the program to do is change the title of the window the mouse cursor is at when i press a key on the keyboard

那你为什么要使用 mouse hook 而不是 keyboard hook？在键盘挂钩中，您可以使用 GetCursorPos() 获取当前鼠标屏幕位置。

至于你的实际问题，你没有检查以确保 WindowFromPoint() 甚至根本没有找到 window，你没有将正确对齐的内存指针传递给 WM_SETTEXT，并且您没有考虑目标 window 是 Ansi 还是 Unicode。

尝试更像这样的东西：

键盘挂钩：

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    if ((nCode == HC_ACTION) && (wParam == WM_KEYUP))
    {
        KBDLLHOOKSTRUCT* p = (KBDLLHOOKSTRUCT*)lParam;
        if (p->vkCode == ...) // whatever key you are looking for
        {
            POINT pt;
            GetCursorPos(&pt);

            HWND hiWnd = WindowFromPoint(pt);
            if (hiWnd)
            {
                ScreenToClient(hiWnd, &pt);

                if (IsWindowUnicode(hiWnd))
                {
                    LPWSTR buf = (LPWSTR) GlobalAlloc(GMEM_FIXED, 33 * sizeof(WCHAR));
                    if (buf)
                    {
                        snwprintf(buf, 33, L"X:%ld, Y:%ld", pt.x, pt.y);
                        SendMessageW(hiWnd, WM_SETTEXT, 0, (LPARAM)buf);
                        GlobalFree(buf);
                    }
                }
                else
                {
                    LPSTR buf = (LPSTR) GlobalAlloc(GMEM_FIXED, 33);
                    if (buf)
                    {
                        snprintf(buf, 33, "X:%ld, Y:%ld", pt.x, pt.y);
                        SendMessageA(hiWnd, WM_SETTEXT, 0, (LPARAM)buf);
                        GlobalFree(buf);
                    }
                }
            }
        }
    }

    return CallNextHookEx(0, nCode, wParam, lParam);
}

鼠标挂钩：

LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    if ((nCode == HC_ACTION) && (wParam == WM_MOUSEMOVE))
    {
        MSLLHOOKSTRUCT* p = (MSLLHOOKSTRUCT*)lParam;

        HWND hiWnd = WindowFromPoint(p->pt);
        if (hiWnd)
        {
            POINT pt = p->pt;
            ScreenToClient(hiWnd, &pt);

            if (IsWindowUnicode(hiWnd))
            {
                LPWSTR buf = (LPWSTR) GlobalAlloc(GMEM_FIXED, 33 * sizeof(WCHAR));
                if (buf)
                {
                    snwprintf(buf, 33, L"X:%ld, Y:%ld", pt.x, pt.y);
                    SendMessageW(hiWnd, WM_SETTEXT, 0, (LPARAM)buf);
                    GlobalFree(buf);
                }
            }
            else
            {
                LPSTR buf = (LPSTR) GlobalAlloc(GMEM_FIXED, 33);
                if (buf)
                {
                    snprintf(buf, 33, "X:%ld, Y:%ld", pt.x, pt.y);
                    SendMessageA(hiWnd, WM_SETTEXT, 0, (LPARAM)buf);
                    GlobalFree(buf);
                }
            }
        }
    }

    return CallNextHookEx(0, nCode, wParam, lParam);
}

获取光标位置和 hwnd 的低级鼠标钩子

Low level mouse hook getting cursor position and hwnd

c

winapi

mouse-hook