需要在APP 代码中添加hock

class CTestApp : public CWinApp
{
public:CTestApp();HHOOK m_hHook;
// 重写
public:static LRESULT CALLBACK GetMessageProc(int nCode, WPARAM wParam, LPARAM lParam);virtual BOOL InitInstance();DECLARE_MESSAGE_MAP()virtual int ExitInstance();
};

```cpp
#include "stdafx.h"#ifdef _DEBUG
#define new DEBUG_NEW
#endifBEGIN_MESSAGE_MAP(CTestApp, CWinApp)
END_MESSAGE_MAP()// CTestApp 构造CTestApp::CTestApp()
{// TODO:  在此处添加构造代码，// 将所有重要的初始化放置在 InitInstance 中
}// 唯一的一个 CTestApp 对象CTestApp theApp;// CTestApp 初始化LRESULT CALLBACK CTestApp::GetMessageProc(int nCode, WPARAM wParam, LPARAM lParam)
{AFX_MANAGE_STATE(AfxGetStaticModuleState());LPMSG lpMsg = (LPMSG)lParam;if (AfxGetApp()->PreTranslateMessage(lpMsg)){lpMsg->message = WM_NULL;lpMsg->lParam = 0L;lpMsg->wParam = 0;}// Passes the hook information to the next hook procedure in// the current hook chain.return ::CallNextHookEx(theApp.m_hHook, nCode, wParam, lParam);
}BOOL CTestApp::InitInstance()
{CWinApp::InitInstance();AfxEnableControlContainer();BOOL bol = AfxOleInit();//初始化控件环境 AfxEnableControlContainer(); HRESULT rs = CoInitialize(NULL);m_hHook = ::SetWindowsHookEx(WH_GETMESSAGE,GetMessageProc,AfxGetInstanceHandle(),GetCurrentThreadId());return TRUE;
}int CTestApp::ExitInstance()
{// TODO:  在此添加专用代码和/或调用基类UnhookWindowsHookEx((HHOOK)m_hHook);return CWinApp::ExitInstance();
}

在实际对话框代码中先定义：

CToolTipCtrl m_ToolTip;

在适当的地方初始化

if (m_ToolTip.m_hWnd == NULL)
{m_ToolTip.Create(this);m_ToolTip.Activate(TRUE);m_ToolTip.SetTipBkColor(RGB(255, 255, 255));m_ToolTip.AddTool(GetDlgItem(IDC_ALG_TOOL_COMBO), _T(""));m_ToolTip.AddTool(GetDlgItem(IDC_COMBO_IMAGE), _T(""));
}

重写PreTranslateMessage

BOOL CTestDialog::PreTranslateMessage(MSG* pMsg)
{// TODO:  在此添加专用代码和/或调用基类switch (pMsg->message){case WM_MOUSEMOVE:m_ToolTip.RelayEvent(pMsg);break;default:break;}// 不要对消息拦截,按实际情况处理return FALSE;
}