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当应用程序不在焦点时,如何使应用程序检测到 Kay press?[已解决] 当应用程序窗口没有聚焦时,我需要在插入键按下时启动计时器并在再次按下时停止。 谁能告诉我源代码或一些基于 MFC 的示例?我知道 MFC 没有那种成员,但是在 MFC 中实现的正确源代码看起来如何? 如何通过按键启动计时器?

  // MainHamsterDlg.cpp : implementation file

        #include "stdafx.h"
        #include "MainHamsterDlg.h"

        // MainHamsterDlg dialog
        IMPLEMENT_DYNAMIC(MainHamsterDlg, CDialogEx)

        MainHamsterDlg::MainHamsterDlg(CWnd* pParent)
            : CDialogEx(MainHamsterDlg::IDD, pParent)
        {

        }

        void MainHamsterDlg::DoDataExchange(CDataExchange* pDX)
        {
            CDialogEx::DoDataExchange(pDX);
        }


        BEGIN_MESSAGE_MAP(MainHamsterDlg, CDialogEx)
            ON_WM_TIMER()
        END_MESSAGE_MAP()


        HHOOK _hook;
        KBDLLHOOKSTRUCT kbdStruct;

        LRESULT __stdcall HookCallback(int nCode, WPARAM wParam, LPARAM lParam)
        {
            if (nCode >= 0)
            {
                // the action is valid: HC_ACTION.
                if (wParam == WM_KEYUP)
                {
                    kbdStruct = *((KBDLLHOOKSTRUCT*)lParam);
                    // a key (non-system) is pressed.
                    if (kbdStruct.vkCode == VK_INSERT)
                    {
                       SetTimer(NULL, 0, 0, NULL); <<<----- this don't starts timer 
                    }
                }
            }
           return CallNextHookEx(_hook, nCode, wParam, lParam);
        }

        void SetHook()
        {
            if (!(_hook = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, NULL, 0)))
            {
                MessageBox(NULL, "Failed to install hook!", "Error", MB_ICONERROR);
            }
        }

        void ReleaseHook()
        {
            UnhookWindowsHookEx(_hook);
        }

        BOOL MainHamsterDlg::OnInitDialog()
        { SetHook();

            //SetTimer(0, 0, NULL); <<<------- this starts timer 
            CDialogEx::OnInitDialog();

            return TRUE;
        }

        void MainHamsterDlg::OnTimer(UINT nIDEvent)
        {
        //do something
              CDialog::OnTimer(nIDEvent);
        }
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1 回答 1

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你可以使用SetWindowsHookEx

这允许您为任何回调创建全局挂钩。

于 2013-06-10T20:16:22.897 回答