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我有一个快速的问题。我使用 MSDN 中的窗口 api 创建了一个标准窗口，创建了一个窗口站点。我希望程序做的是更改当我按下键盘上的键时鼠标光标所在窗口的标题。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);
}

调用鼠标钩子后，只有我的程序会更改文本。还有，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窗口而获得背景窗口？还是当前鼠标位置所在的窗口？我会假设

ScreenToClient(hiWnd, &p->pt)

谢谢你们的帮助！

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1 回答 1

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我想要程序做的是更改当我按下键盘上的键时鼠标光标所在的窗口的标题

那你为什么用鼠标钩而不是键盘钩呢？在键盘挂钩中，您可以使用GetCursorPos()来获取当前鼠标屏幕位置。

至于您的实际问题，您根本没有检查以确保WindowFromPoint()甚至找到了一个窗口，您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窗口是 Ansi 还是 Unicode。

尝试更多类似的东西：

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);
}
于 2015-08-21T01:10:11.623 回答