c - 如何在 Windows 文本编辑器上阻止打印功能(CTRL + P)？

Question

我想在 Windows 平台上针对特定应用程序阻止打印功能 (CTRL + P)。我正在使用键盘钩子(Hook)来做。我能够检测到 CTRL + P 但我无法阻止它。在 CTRL + P 的情况下，我从 Hook 程序返回，但应用程序仍然收到此消息并处理打印。

LRESULT __declspec(dllexport)__stdcall  CALLBACK KeyboardProc(
    int nCode,
    WPARAM wParam,
    LPARAM lParam)
{
    FILE* f1;
    static WPARAM wPrevParam;

    if (((DWORD)lParam & 0x40000000) && (HC_ACTION == nCode))
    {
        if ((wParam == VK_SPACE) || (wParam == VK_RETURN) || (wParam == VK_CONTROL) || (wParam >= 0x2f) && (wParam <= 0x100))
        {
            char ch;
            f1 = fopen("d:\\report.txt", "a+");
            if (wParam == VK_CONTROL)
            {
                if (wPrevParam == 0x50)// 0x50 = P
                {
                    const char* text = "CTRL-P detected.";
                    fwrite(text, strlen(text), 1, f1);
                    fclose(f1);
                    wParam = 0;
                    lParam = 0;
                    return 1;
                }

                const char *text = "CTRL";
                fwrite(text, strlen(text), 1, f1);
                fprintf(f1, "%02X\n", (unsigned char)wParam);
            }
            else
            {
                wPrevParam = wParam;
            }

            fclose(f1);
        }

    }

    LRESULT RetVal = CallNextHookEx(hkb, nCode, wParam, lParam);

    return  RetVal;

}

Answer 1

I want to block printing functionality(CTRL + P) on windows platform for specific applications. I am doing it using keyboard hook. I am able to detect CTRL + P but I am not able to stop it.

这会在 WH_KEYBOARD_LL Hook 中阻止 [Ctrl] + "P"... 但不会阻止通过 [File] [Print] 或其他方式打印当然... =>/p>

    LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
    {
        DWORD dwKey = 0;
        if (HC_ACTION == nCode)
        {
            KBDLLHOOKSTRUCT *pkbdll = (KBDLLHOOKSTRUCT*)lParam;
            dwKey = pkbdll->vkCode;
            BOOL bCtlDown = GetKeyState(VK_CONTROL) < 0;
            if (bCtlDown && dwKey == 'P')
            {           
                Beep(6000, 10);
                return 1;
            }
        }
        return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
    }