qt实现全局热键（win下）

文章目录

• • • • • 1. 注册热键
        • 2. 实现QAbstractNativeEventFilter，重载nativeEventFilter，在此方法中处理WM_HOTKEY消息
        • 3. QApplication中安装NativeEventFilter
        • 0. 流程解析

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1. 注册热键

BOOL RegisterHotKey( 
  HWND hWnd, 
  int id, 
  UINT fsModifiers, 
  UINT vk 
);
//https://docs.microsoft.com/en-us/previous-versions/aa922958(v=msdn.10)

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2. 实现QAbstractNativeEventFilter，重载nativeEventFilter，在此方法中处理WM_HOTKEY消息

#include <windows.h>
class WinEventFilter:public QAbstractNativeEventFilter{
public:
    bool nativeEventFilter(const QByteArray &eventType, void *message, long *result){
        if(eventType == "windows_generic_MSG") {
             MSG *msg = static_cast<MSG *>(message);
             if(msg->message == WM_HOTKEY) {
			     //处理热键消息
                 UINT fuModifiers = (UINT) LOWORD(msg->lParam);
                 UINT uVirtKey = (UINT) HIWORD(msg->lParam);
                 //虚拟键码查询 https://docs.microsoft.com/zh-cn/windows/win32/inputdev/virtual-key-codes
                 //消息各字段含义 https://docs.microsoft.com/en-us/previous-versions/aa931321(v=msdn.10)?redirectedfrom=MSDN
             }
         }
         return false;//返回false消息继续向上传递，返回true消息不继续向上传递
    }
};

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3. QApplication中安装NativeEventFilter

#include <windows.h>
QApplication a(argc, args);
a.installNativeEventFilter(new WinEventFilter);

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0. 流程解析

调用win32api RegisterHotKey后，注册热键。按下注册过的热键就会产生WM_HOTKEY消息。
重载QAbstractNativeEventFilter处理WM_HOTKEY消息。
QApplication安装此NativeEventFilter即可全局监听消息