c++ win32 add a hyperlink to a dialog - c++

Question

I would like to add an About dialog to my Win32 application (developed using C++). How can I add a hyperlink to the dialog? I'm loading the dialog from a resource file (.rc). Is it possible to define this functionality from the .rc file?
My .rc file now looks like this:
IDD_ABOUTBOX DIALOGEX 0, 0, 218, 118
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU | DS_CENTER
CAPTION "About My App"
FONT 8, "MS Shell Dlg"
BEGIN
ICON IDI_APP_ICON,IDC_STATIC,13,88,15,15
LTEXT "MY url http://www.myurl.com",IDC_STATIC,15,6,194,24,SS_NOPREFIX
DEFPUSHBUTTON "OK",IDOK,95,98,50,14,WS_GROUP
END

Answer 1

You can use a SysLink Control on Windows XP or above.
You can define it from the .rc file like this:
In resource.rc:
CONTROL "<a>Link</a>",IDC_SYSLINK1,"SysLink",WS_TABSTOP,7,7,53,12
In resource.h:
#define IDC_SYSLINK1 1001

Answer 2

Best way to do the highlighting without any external libraries, still looks and feels the same way any control would do it, even makes the mouse cursor into a finger pointing icon.
/* Start of HyperLink URL */
#define PROP_ORIGINAL_FONT TEXT("_Hyperlink_Original_Font_")
#define PROP_ORIGINAL_PROC TEXT("_Hyperlink_Original_Proc_")
#define PROP_STATIC_HYPERLINK TEXT("_Hyperlink_From_Static_")
#define PROP_UNDERLINE_FONT TEXT("_Hyperlink_Underline_Font_")
LRESULT CALLBACK _HyperlinkParentProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK _HyperlinkProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
static void CreateHyperLink(HWND hwndControl);
/* End of HyperLink URL */
static void CreateHyperLink(HWND hwndControl)
{
// Subclass the parent so we can color the controls as we desire.
HWND hwndParent = GetParent(hwndControl);
if (NULL != hwndParent)
{
WNDPROC pfnOrigProc = (WNDPROC)GetWindowLong(hwndParent, GWL_WNDPROC);
if (pfnOrigProc != _HyperlinkParentProc)
{
SetProp(hwndParent, PROP_ORIGINAL_PROC, (HANDLE)pfnOrigProc);
SetWindowLong(hwndParent, GWL_WNDPROC, (LONG)(WNDPROC)_HyperlinkParentProc);
}
}
// Make sure the control will send notifications.
DWORD dwStyle = GetWindowLong(hwndControl, GWL_STYLE);
SetWindowLong(hwndControl, GWL_STYLE, dwStyle | SS_NOTIFY);
// Subclass the existing control.
WNDPROC pfnOrigProc = (WNDPROC)GetWindowLong(hwndControl, GWL_WNDPROC);
SetProp(hwndControl, PROP_ORIGINAL_PROC, (HANDLE)pfnOrigProc);
SetWindowLong(hwndControl, GWL_WNDPROC, (LONG)(WNDPROC)_HyperlinkProc);
// Create an updated font by adding an underline.
HFONT hOrigFont = (HFONT)SendMessage(hwndControl, WM_GETFONT, 0, 0);
SetProp(hwndControl, PROP_ORIGINAL_FONT, (HANDLE)hOrigFont);
LOGFONT lf;
GetObject(hOrigFont, sizeof(lf), &lf);
lf.lfUnderline = TRUE;
HFONT hFont = CreateFontIndirect(&lf);
SetProp(hwndControl, PROP_UNDERLINE_FONT, (HANDLE)hFont);
// Set a flag on the control so we know what color it should be.
SetProp(hwndControl, PROP_STATIC_HYPERLINK, (HANDLE)1);
}
LRESULT CALLBACK _HyperlinkParentProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
WNDPROC pfnOrigProc = (WNDPROC)GetProp(hwnd, PROP_ORIGINAL_PROC);
switch (message)
{
case WM_CTLCOLORSTATIC:
{
HDC hdc = (HDC)wParam;
HWND hwndCtl = (HWND)lParam;
BOOL fHyperlink = (NULL != GetProp(hwndCtl, PROP_STATIC_HYPERLINK));
if (fHyperlink)
{
LRESULT lr = CallWindowProc(pfnOrigProc, hwnd, message, wParam, lParam);
SetTextColor(hdc, RGB(0, 0, 192));
return lr;
}
break;
}
case WM_DESTROY:
{
SetWindowLong(hwnd, GWL_WNDPROC, (LONG)pfnOrigProc);
RemoveProp(hwnd, PROP_ORIGINAL_PROC);
break;
}
}
return CallWindowProc(pfnOrigProc, hwnd, message, wParam, lParam);
}
LRESULT CALLBACK _HyperlinkProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
WNDPROC pfnOrigProc = (WNDPROC)GetProp(hwnd, PROP_ORIGINAL_PROC);
switch (message)
{
case WM_DESTROY:
{
SetWindowLong(hwnd, GWL_WNDPROC, (LONG)pfnOrigProc);
RemoveProp(hwnd, PROP_ORIGINAL_PROC);
HFONT hOrigFont = (HFONT)GetProp(hwnd, PROP_ORIGINAL_FONT);
SendMessage(hwnd, WM_SETFONT, (WPARAM)hOrigFont, 0);
RemoveProp(hwnd, PROP_ORIGINAL_FONT);
HFONT hFont = (HFONT)GetProp(hwnd, PROP_UNDERLINE_FONT);
DeleteObject(hFont);
RemoveProp(hwnd, PROP_UNDERLINE_FONT);
RemoveProp(hwnd, PROP_STATIC_HYPERLINK);
break;
}
case WM_MOUSEMOVE:
{
if (GetCapture() != hwnd)
{
HFONT hFont = (HFONT)GetProp(hwnd, PROP_UNDERLINE_FONT);
SendMessage(hwnd, WM_SETFONT, (WPARAM)hFont, FALSE);
InvalidateRect(hwnd, NULL, FALSE);
SetCapture(hwnd);
}
else
{
RECT rect;
GetWindowRect(hwnd, &rect);
POINT pt = { LOWORD(lParam), HIWORD(lParam) };
ClientToScreen(hwnd, &pt);
if (!PtInRect(&rect, pt))
{
HFONT hFont = (HFONT)GetProp(hwnd, PROP_ORIGINAL_FONT);
SendMessage(hwnd, WM_SETFONT, (WPARAM)hFont, FALSE);
InvalidateRect(hwnd, NULL, FALSE);
ReleaseCapture();
}
}
break;
}
case WM_SETCURSOR:
{
// Since IDC_HAND is not available on all operating systems,
// we will load the arrow cursor if IDC_HAND is not present.
HCURSOR hCursor = LoadCursor(NULL, IDC_HAND);
if (NULL == hCursor)
hCursor = LoadCursor(NULL, IDC_ARROW);
SetCursor(hCursor);
return TRUE;
}
}
return CallWindowProc(pfnOrigProc, hwnd, message, wParam, lParam);
}
Here is how to use it:
CreateHyperLink(GetDlgItem(Dialog_HWND_GOES_HERE, STATIC_TEXT_IDENIFIER_GOES_HERE));
Where the static label can get clicked in the main dialogs subclass do something like this..
if (HIWORD(wParam) == BN_CLICKED) { //Buttons, checkboxs, labels, static labels clicked
switch (LOWORD(wParam))
{
case STATIC_TEXT_IDENIFIER_GOES_HERE:
ShellExecute(NULL, "open", "http://www.google.com", NULL, NULL, SW_SHOWNORMAL);
break;
}
}