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在VC中为应用程序添加图形超链接功能

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本实例通过定义一个CmapHyperLink类实现了图像的超链接功能

作者：刘涛来源：天极开发 2007年10月16日

关键字：

三、程序代码

/////////////////////////////////////////////////////////////////////////
//MapHyperLink.h , MapHyperLink.cpp
#if !defined(AFX_HYPERLINK_H__D1625061_574B_11D1_ABBA_00A0243D1382__INCLUDED_)
#define AFX_HYPERLINK_H__D1625061_574B_11D1_ABBA_00A0243D1382__INCLUDED_
#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

// CHyperLink window
class CMapHyperLink : public CStatic
{
　// Construction/destruction
　public:
　　CMapHyperLink();
　　virtual ~CMapHyperLink();
　public:
　　void SetURL(CString strURL);
　　CString GetURL() const;
　　void SetTipText(CString strURL);
　　CString GetTipText() const;
　　void SetVisited(BOOL bVisited = TRUE);
　　BOOL GetVisited() const;
　　void SetLinkCursor(HCURSOR hCursor);
　　HCURSOR GetLinkCursor() const;
　　void SetAutoSize(BOOL bAutoSize = TRUE);
　　BOOL GetAutoSize() const;
　　// Overrides
　　// ClassWizard generated virtual function overrides
　　//{{AFX_VIRTUAL(CHyperLink)
　　　public:
　　　　virtual BOOL PreTranslateMessage(MSG* pMsg);
　　　protected:
　　　　virtual void PreSubclassWindow();
　　//}}AFX_VIRTUAL
　　// Implementation
　protected:
　　HINSTANCE GotoURL(LPCTSTR url, int showcmd);
　　void ReportError(int nError);
　　LONG GetRegKey(HKEY key, LPCTSTR subkey, LPTSTR retdata);
　　void PositionWindow();
　　void SetDefaultCursor();
　　// Protected attributes
　protected:
　　BOOL m_bOverControl; // cursor over control?
　　BOOL m_bVisited; // Has it been visited?
　　BOOL m_bAdjustToFit; // Adjust window size to fit text?
　　CString m_strURL; // hyperlink URL
　　CString m_strTipText; // TipTool control' text
　　HCURSOR m_hLinkCursor; // Cursor for hyperlink
　　CToolTipCtrl m_ToolTip; // The tooltip
　protected: // Generated message map functions
　　//{{AFX_MSG(CHyperLink)
　　　afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
　　　afx_msg void OnMouseMove(UINT nFlags, CPoint point);
　　//}}AFX_MSG
　　afx_msg void OnClicked();
　　DECLARE_MESSAGE_MAP()
};
#endif

///////////////////////////////////////////////////////////// MapHyperLink.cpp
#include "stdafx.h"
#include "MapHyperLink.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define TOOLTIP_ID 1

CMapHyperLink::CMapHyperLink()
{
　m_hLinkCursor = NULL; // No cursor as yet
　m_bOverControl = FALSE; // Cursor not yet over control
　m_bVisited = FALSE; // Hasn't been visited yet.
　m_bAdjustToFit = TRUE; // Resize the window to fit the text?
　m_strURL.Empty();
　m_strTipText.Empty();
}

CMapHyperLink::~CMapHyperLink()
{}

BEGIN_MESSAGE_MAP(CMapHyperLink, CStatic)
//{{AFX_MSG_MAP(CMapHyperLink)
　ON_CONTROL_REFLECT(STN_CLICKED, OnClicked)
　ON_WM_SETCURSOR()
　ON_WM_MOUSEMOVE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

// CMapHyperLink message handlers
BOOL CMapHyperLink::PreTranslateMessage(MSG* pMsg)
{
　m_ToolTip.RelayEvent(pMsg);
　return CStatic::PreTranslateMessage(pMsg);
}

void CMapHyperLink::OnClicked()
{
　int result = (int)GotoURL(m_strURL, SW_SHOW);
　m_bVisited = (result > HINSTANCE_ERROR);
　if (!m_bVisited) {
　　MessageBeep(MB_ICONEXCLAMATION); // Unable to follow link
　　ReportError(result);
　} else
　SetVisited(); // Repaint to show visited colour
}

void CMapHyperLink::OnMouseMove(UINT nFlags, CPoint point)
{
　CStatic::OnMouseMove(nFlags, point);
　if (m_bOverControl) // Cursor is currently over control
　{
　　CRect rect;
　　GetClientRect(rect);
　　if (!rect.PtInRect(point))
　　{
　　　m_bOverControl = FALSE;
　　　ReleaseCapture();
　　　RedrawWindow();
　　　return;
　　}
　}
　else // Cursor has just moved over control
　{
　　m_bOverControl = TRUE;
　　RedrawWindow();
　　SetCapture();
　}
}

BOOL CMapHyperLink::OnSetCursor(CWnd* /*pWnd*/, UINT /*nHitTest*/, UINT /*message*/)
{
　if (m_hLinkCursor)
　{
　　::SetCursor(m_hLinkCursor);
　　return TRUE;
　}
　return FALSE;
}

void CMapHyperLink::PreSubclassWindow()
{
　// We want to get mouse clicks via STN_CLICKED
　DWORD dwStyle = GetStyle();
　::SetWindowLong(GetSafeHwnd(), GWL_STYLE, dwStyle | SS_NOTIFY);
　SetDefaultCursor(); // Try and load up a "hand" cursor
　// Create the tooltip
　CRect rect;
　GetClientRect(rect);
　m_ToolTip.Create(this);
　if (m_strTipText.IsEmpty())
　{
　　m_strTipText = m_strURL;
　}
　m_ToolTip.AddTool(this, m_strTipText, rect, TOOLTIP_ID);
　CStatic::PreSubclassWindow();
}

////////////////////////////////////////////// CMapHyperLink operations
void CMapHyperLink::SetURL(CString strURL)
{
　m_strURL = strURL;
　if (::IsWindow(GetSafeHwnd())) {
　　PositionWindow();
　　if (m_strTipText.IsEmpty())
　　{
　　　m_strTipText = strURL;
　　}
　　m_ToolTip.UpdateTipText(m_strTipText, this, TOOLTIP_ID);
　}
}

CString CMapHyperLink::GetURL() const
{
　return m_strURL;
}

void CMapHyperLink::SetTipText(CString strTipText)
{
　m_strTipText = strTipText;
　if (::IsWindow(GetSafeHwnd())) {
　　PositionWindow();
　　m_ToolTip.UpdateTipText(m_strTipText, this, TOOLTIP_ID);
　}
}

CString CMapHyperLink::GetTipText() const
{
　return m_strTipText;
}

void CMapHyperLink::SetVisited(BOOL bVisited /* = TRUE */)
{
　m_bVisited = bVisited;
　if (::IsWindow(GetSafeHwnd()))
　　Invalidate();
}

BOOL CMapHyperLink::GetVisited() const
{
　return m_bVisited;
}

void CMapHyperLink::SetLinkCursor(HCURSOR hCursor)
{
　m_hLinkCursor = hCursor;
　if (m_hLinkCursor == NULL)
　　SetDefaultCursor();
}

HCURSOR CMapHyperLink::GetLinkCursor() const
{
　return m_hLinkCursor;
}

void CMapHyperLink::SetAutoSize(BOOL bAutoSize /* = TRUE */)
{
　m_bAdjustToFit = bAutoSize;
　if (::IsWindow(GetSafeHwnd()))
　　PositionWindow();
}

BOOL CMapHyperLink::GetAutoSize() const
{
　return m_bAdjustToFit;
}

// Move and resize the window so that the window is the same size
void CMapHyperLink::PositionWindow()
{
　if (!::IsWindow(GetSafeHwnd()) || !m_bAdjustToFit)
　　return;
　// Get the current window position
　CRect rect;
　GetWindowRect(rect);
　CWnd* pParent = GetParent();
　if (pParent)
　　pParent->ScreenToClient(rect);
　CRect rectMap;
　GetClientRect(rectMap);
　// Get the text justification via the window style
　DWORD dwStyle = GetStyle();
　// Recalc the window size and position based on the text justification
　if (dwStyle & SS_CENTERIMAGE)
　　rect.DeflateRect(0, (rect.Height() - rectMap.Height())/2);
　else
　　rect.bottom = rect.top + rectMap.Height();
　　if (dwStyle & SS_CENTER)
　　　rect.DeflateRect((rect.Width() - rectMap.Width())/2, 0);
　　else if (dwStyle & SS_RIGHT)
　　　rect.left = rect.right - rectMap.Width();
　　else // SS_LEFT = 0, so we can't test for it explicitly
　　　rect.right = rect.left + rectMap.Width();
　　　// Move the window
　　SetWindowPos(NULL, rect.left, rect.top, rect.Width(), rect.Height(), SWP_NOZORDER);
}

/////////////////////////////////////////////////// CMapHyperLink implementation
void CMapHyperLink::SetDefaultCursor()
{
　if (m_hLinkCursor == NULL) // No cursor handle - load our own
　{
　　// Get the windows directory
　　CString strWndDir;
　　GetWindowsDirectory(strWndDir.GetBuffer(MAX_PATH), MAX_PATH);
　　strWndDir.ReleaseBuffer();
　　strWndDir += _T("\\winhlp32.exe");
　　// This retrieves cursor #106 from winhlp32.exe, which is a hand pointer
　　HMODULE hModule = LoadLibrary(strWndDir);
　　if (hModule) {
　　　HCURSOR hHandCursor = ::LoadCursor(hModule, MAKEINTRESOURCE(106));
　　　if (hHandCursor)
　　　　m_hLinkCursor = CopyCursor(hHandCursor);
　　}
　　FreeLibrary(hModule);
　}
}

LONG CMapHyperLink::GetRegKey(HKEY key, LPCTSTR subkey, LPTSTR retdata)
{
　HKEY hkey;
　LONG retval = RegOpenKeyEx(key, subkey, 0, KEY_QUERY_VALUE, &hkey);
　if (retval == ERROR_SUCCESS) {
　　long datasize = MAX_PATH;
　　TCHAR data[MAX_PATH];
　　RegQueryValue(hkey, NULL, data, &datasize);
　　lstrcpy(retdata,data);
　　RegCloseKey(hkey);
　}
　return retval;
}

void CMapHyperLink::ReportError(int nError)
{
　CString str;
　switch (nError) {
　　case 0:
　　　str = "The operating system is out\nof memory or resources."; break;
　　case SE_ERR_PNF:
　　　str = "The specified path was not found."; break;
　　case SE_ERR_FNF:
　　　str = "The specified file was not found."; break;
　　case ERROR_BAD_FORMAT:
　　　str = "The .EXE file is invalid\n(non-Win32 .EXE or error in .EXE image)."; break;
　　case SE_ERR_ACCESSDENIED:
　　　str = "The operating system denied\naccess to the specified file."; break;
　　case SE_ERR_ASSOCINCOMPLETE:
　　　str = "The filename association is\nincomplete or invalid."; break;
　　case SE_ERR_DDEBUSY:
　　　str = "The DDE transaction could not\nbe completed because other DDE transactions\nwere being processed."; break;
　　case SE_ERR_DDEFAIL:
　　　str = "The DDE transaction failed."; break;
　　case SE_ERR_DDETIMEOUT:
　　　str = "The DDE transaction could not\nbe completed because the request timed out."; break;
　　case SE_ERR_DLLNOTFOUND:
　　　str = "The specified dynamic-link library was not found."; break;
　　case SE_ERR_NOASSOC:
　　　str = "There is no application associated\nwith the given filename extension."; break;
　　case SE_ERR_OOM:
　　　str = "There was not enough memory to complete the operation."; break;
　　case SE_ERR_SHARE:
　　　str = "A sharing violation occurred. ";
　　default:
　　　str.Format("Unknown Error (%d) occurred.", nError); break;
　}
　str = "Unable to open hyperlink:\n\n" + str;
　AfxMessageBox(str, MB_ICONEXCLAMATION | MB_OK);
}

HINSTANCE CMapHyperLink::GotoURL(LPCTSTR url, int showcmd)
{
　TCHAR key[MAX_PATH + MAX_PATH];
　// First try ShellExecute()
　HINSTANCE result = ShellExecute(NULL, _T("open"), url, NULL,NULL, showcmd);
　// If it failed, get the .htm regkey and lookup the program
　if ((UINT)result <= HINSTANCE_ERROR) {
　　if (GetRegKey(HKEY_CLASSES_ROOT, _T(".htm"), key) == ERROR_SUCCESS) {
　　　lstrcat(key, _T("\\shell\\open\\command"));
　　　if (GetRegKey(HKEY_CLASSES_ROOT,key,key) == ERROR_SUCCESS) {
　　　　TCHAR *pos;
　　　　pos = _tcsstr(key, _T("\"%1\""));
　　　　if (pos == NULL) { // No quotes found
　　　　　pos = strstr(key, _T("%1")); // Check for %1, without quotes
　　　　　if (pos == NULL) // No parameter at all...
　　　　　　pos = key+lstrlen(key)-1;
　　　　　else
　　　　　　*pos = '\0'; // Remove the parameter
　　　　}
　　　　else
　　　　　*pos = '\0'; // Remove the parameter
　　　　　lstrcat(pos, _T(" "));
　　　　　lstrcat(pos, url);
　　　　　result = (HINSTANCE) WinExec(key,showcmd);
　　　}
　　}
　}
　return result;
}
/////////////////////////////////////////////////////////////////////////////////////

BOOL CTestDlg::OnInitDialog()
{
　CDialog::OnInitDialog();
　// Set the icon for this dialog. The framework does this automatically
　// when the application's main window is not a dialog
　SetIcon(m_hIcon, TRUE); // Set big icon
　SetIcon(m_hIcon, FALSE); // Set small icon
　//设置图形的超链接
　m_MapHyperLink1.SetURL("www.yesky.com");
　m_MapHyperLink1.SetTipText("欢迎访问天极网");
　// TODO: Add extra initialization here
　return TRUE; // return TRUE unless you set the focus to a control
}

　　四、小结

　　本实例通过介绍如何实现超链接功能，介绍了工具提示、动态地从可执行文件中加载图标、使用外壳函数ShellExecute（）等知识，甚至还包括注册表的操作等内容，应该说虽然程序比较简单，但包含的内容还是比较丰富的。最后，运行此程序，将在对话框上显示"天极网"的首页链接，在图像上点鼠标左键后将自动进入天极网首页，效果很理想。

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