QT键盘钩子拦截按键并显示到QListWidget

项目需要拦截键盘按键并记录下来，如果只需要记录界面激活状态下的按键信息，只需要设置grabKeyboard()，就可以在virtual void

keyPressEvent(QKeyEvent *ev);
virtual void keyReleaseEvent(QKeyEvent *ev);

#include <windows.h>
HHOOK key_hook=nullptr;
MacroDialog *g_MacroDlg = nullptr;
DWORD g_oldKeyCode=0;
DWORD g_oldKeyFlag=0;
LRESULT CALLBACK KeyboardProc(int code, WPARAM wparam, LPARAM lparam)
{   
    //if(lparam>0)    
    PKBDLLHOOKSTRUCT l=(PKBDLLHOOKSTRUCT)lparam;    
    g_MacroDlg->OnHookKey(l->vkCode,l->flags);   
    return CallNextHookEx(nullptr, code, wparam, lparam);
}
//开始记录的时候
register_key_hookvoid MacroDialog::register_key_hook()
{  
    if(key_hook)
        return;  
 key_hook = SetWindowsHookEx(WH_KEYBOARD_LL,KeyboardProc,nullptr,0);
}
//记录完unregister_key_hookvoid MacroDialog::unregister_key_hook()
{ 
    UnhookWindowsHookEx(key_hook); 
    key_hook = nullptr;
}
//定义
QListWidget *m_MacroList;    
m_MacroList =new QListWidget(this);    
m_MacroList->setGeometry(276, 144, 271, 266);   
m_MacroList->setViewMode(QListView::ListMode);    
m_MacroList->setIconSize(QSize(20,20));    
m_MacroList->setSpacing(1);    
m_MacroList->setMovement(QListView::Free);    
m_MacroList->setFlow(QListView::TopToBottom);  
//设置样式，直接在函数中设置    
m_MacroList->setStyleSheet("QListWidget{border:0px solid gray; color:black; }"                               
                           "QListWidget::Item:hover{background:skyblue; }"                               
                           "QListWidget::item:selected{background:lightgray; color:red; }"                               
                           "QListWidget::item:selected:!active{border-width:0px; background:lightgreen; }"                               
                          );                               
void MacroDialog::OnHookKey(DWORD dwVCode, DWORD dwFlag)
{    
    //屏蔽掉按键按下重复发送的keydown的值    
    if(g_oldKeyCode == dwVCode && g_oldKeyFlag == dwFlag)        
        return;    
    g_oldKeyCode = dwVCode;    
    g_oldKeyFlag = dwFlag;    
    labelFocus->setFocus();    
    QString str;    
    TCHAR char_str[255];    
    GetKeyNameText(MapVirtualKey(dwVCode,0)<<16,char_str,sizeof (char_str));    
    QString ret = QString::fromWCharArray(char_str);   
    QListWidgetItem *item =new QListWidgetItem();    
    if(dwFlag==0)    
    {        
        item->setIcon(QIcon(":/skin/key_down.png"));    
    }    
    else    
    {        
        item->setIcon(QIcon(":/skin/key_up.png"));    
    }        
    //WillListItem为自己封装的继承于QWidget的类，目的是自己对要设置的item的Widget进行布局    
    WillListItem *m_Item = new WillListItem();    
    m_Item->SetLabel(ret);    
    //item->setFlags(Qt::NoItemFlags);    
    m_MacroList->addItem(item);    
    m_MacroList->setItemWidget(item,m_Item);    
    m_MacroList->setCurrentRow(m_MacroList->count()-1);
}

效果如图：