问题描述
- Windows编程如何监听鼠标是否被一直按下
-
//这个函数用来处理 鼠标和键盘的事件 void OnWindowMessage( HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam ) { switch (message) { case WM_LBUTTONDOWN: MessageBox(NULL, "检测到鼠标事件", "这个是标题", 0); bIsMouseDown = true; break; case WM_LBUTTONUP: bIsMouseDown = false; break; case WM_KEYDOWN: break; } }我想按下鼠标左键不松开一直弹出MessageBox，松开左键不再弹出。上面代码的效果是点击左键不松开只弹出一次对话框。这个该怎么实现呢？
解决方案
void OnWindowMessage( HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam ) {
switch (message)
{
case WM_LBUTTONDOWN:
bIsMouseDown = true;
whilebIsMouseDown bLBTNDown)
{
MessageBox(NULL, "检测到鼠标事件", "这个是标题", 0);
}
break;
case WM_LBUTTONUP:
bIsMouseDown = false;
break;
case WM_KEYDOWN:
break;
}
}
解决方案二：
- void OnWindowMessage( HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam ) {
switch (message)
{
case WM_LBUTTONDOWN:
bIsMouseDown = true;
while(bIsMouseDown)
{
MessageBox(NULL, "检测到鼠标事件", "这个是标题", 0);
}
break;
case WM_LBUTTONUP:
bIsMouseDown = false;
break;
case WM_KEYDOWN:
break;
}
}
解决方案三：
- void OnWindowMessage( HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam ) {
switch (message)
{
case WM_LBUTTONDOWN:
bIsMouseDown = true;
while(bIsMouseDown)
{
MessageBox(NULL, "检测到鼠标事件", "这个是标题", 0);
}
break;
case WM_LBUTTONUP:
bIsMouseDown = false;
break;
case WM_KEYDOWN:
break;
}
}
解决方案四：
// LeftButtonDownDlg.cpp : 实现文件
//
#include "stdafx.h"
#include "LeftButtonDown.h"
#include "LeftButtonDownDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
static BOOL bIsMouseDown = FALSE;
HWND m_hWnd;
HHOOK hhookMs = NULL;//钩子句柄
LRESULT CALLBACK LowLevelMouseProc (INT nCode, WPARAM wParam, LPARAM lParam);//钩子回调函数
BOOL UninstallKbHook();//注销钩子
BOOL InstallKbHook();//注册钩子
// 用于应用程序“关于”菜单项的 CAboutDlg 对话框
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// 对话框数据
enum { IDD = IDD_ABOUTBOX };
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持
// 实现
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()
// CLeftButtonDownDlg 对话框
CLeftButtonDownDlg::CLeftButtonDownDlg(CWnd* pParent /*=NULL*/)
: CDialog(CLeftButtonDownDlg::IDD, pParent)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
InstallKbHook( );
}
void CLeftButtonDownDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CLeftButtonDownDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
// ON_WM_LBUTTONUP()
END_MESSAGE_MAP()
// CLeftButtonDownDlg 消息处理程序
BOOL CLeftButtonDownDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// 将“关于...”菜单项添加到系统菜单中。
// IDM_ABOUTBOX 必须在系统命令范围内。
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
// 执行此操作
SetIcon(m_hIcon, TRUE); // 设置大图标
SetIcon(m_hIcon, FALSE); // 设置小图标
// TODO: 在此添加额外的初始化代码
return TRUE; // 除非将焦点设置到控件，否则返回 TRUE
}
void CLeftButtonDownDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// 如果向对话框添加最小化按钮，则需要下面的代码
// 来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
// 这将由框架自动完成。
void CLeftButtonDownDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
// 使图标在工作区矩形中居中
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CLeftButtonDownDlg::OnQueryDragIcon()
{
return static_cast(m_hIcon);
}
LRESULT CALLBACK LowLevelMouseProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
MSLLHOOKSTRUCT *pkbhs = (MSLLHOOKSTRUCT *)lParam;
char strMsg[100] = {0};
switch (nCode)
{
case HC_ACTION:
{
if((wParam == WM_LBUTTONUP))
{
bIsMouseDown = FALSE;
}
}
default:
break;
}
return CallNextHookEx (NULL, nCode, wParam, lParam);
}
BOOL InstallKbHook( )
{
if (hhookMs )
UninstallKbHook();
hhookMs = SetWindowsHookEx(WH_MOUSE_LL,
(HOOKPROC)LowLevelMouseProc, AfxGetApp()->m_hInstance, NULL);
return(hhookMs != NULL);
}
BOOL UninstallKbHook()
{
BOOL fOk = FALSE;
if (hhookMs ) {
fOk = UnhookWindowsHookEx(hhookMs );
hhookMs = NULL;
}
return(fOk);
}
UINT PostMessagBox(LPVOID lpData)
{
HWND tmp = (HWND)lpData;
while(bIsMouseDown)
{
PostMessage(tmp, 0x1234, 0, 0);
Sleep(1000);
}
return 0;
}
static int i = 0;
LRESULT CLeftButtonDownDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
// TODO: 在此添加专用代码和/或调用基类
switch (message)
{
case WM_LBUTTONDOWN:
bIsMouseDown = TRUE;
m_hWnd = GetSafeHwnd();
AfxBeginThread(PostMessagBox, m_hWnd);
break;
case 0x1234:
CString csInfo;
i++;
csInfo.Format("i = %d", i);
MessageBox(csInfo);
return TRUE;
}
return CDialog::WindowProc(message, wParam, lParam);
}
解决方案五：
可以使用HOOK来监听。