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This is a simple hyperlink control that can be plugged into any dialog. There are already
a few examples of this in circulation (PJ Naughter, and one from Paul DiLascia from MSJ)
but none had all the features that I wanted. I have used the
GotoURL function by Stuart
Patterson in the Aug 97 WDJ. It is more robust than a simple
ShellExecute, and I have
modified it to be a little more Unicode friendly.
The hyperlink is initially coloured blue, but changes colour when the cursor
is over it, and after the user has clicked on it. The cursor that appears when
the mouse pointer is over the link can easily be set using
as can the link colours and underlining. The default cursor is a small pointing
hand (cursor #106 from the winhlp32.exe file - Thanks to Paul DiLascia of MSJ for
that one). There is also a tooltip for the link that dispalys the underlying URL
of the control.
The link has three underline modes which are set using
CHyperLink::ulHover - Underline appears when cursor is over link
CHyperLink::ulNone - No underline
CHyperLinkulAlways - Link is always underlined
To use the hyperlink control, just create a static control (eg
and attach it to a member variable of type
CHyperLink. The URL for the link is
taken as the caption of the static control unless otherwise specified. If no
caption for the control is specified then it is set as the URL. If neither exists,
then a debug assertion occurs.
The control can auto-size itself to fit the size of the caption (to preserve
a true hyperlink look and feel). The resizing will honour the
The control is very simple. The button click and colour notifications are
handled by the control, and appropriate fonts and colours selected according
to the state of the link. The only tricky bit is handling the button click.
In order to do this the static control must have the
SS_NOTIFY bit set and
ON_CONTROL_REFLECT handler for the
STN_CLICKED message is installed.
To actually follow the link,
ShellExecute is called to open the URL,
but if this fails, then the registry is examined in order to find a likely
candidate for .htm files. If one is found then this it is launched with the
hope that it can handle the URL string supplied. In any case, an error message
is displayed on failure.
Operations for CHyperLink:
void SetURL(CString strURL);
void SetColours(COLORREF crLinkColour, COLORREF crVisitedColour
COLORREF crHoverColour = -1);
void SetVisited(BOOL bVisited = TRUE);
void SetLinkCursor(HCURSOR hCursor);
void SetUnderline(int nUnderline = CHyperLink::ulHover);
void SetAutoSize(BOOL bAutoSize = TRUE);
Note on SetColour: This allows
the unvisited/visited and hover colours to be specifed. If the Hover colour (the
colour the link appears when the cursor is over it) is -1, then the system
highlight colour is used.
29 Feb 2000 - P. Shaffer standard font modification
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He's been programming way too long and has been, in various guides, an astrophysicist, mechanic, mathematician, physicist, breeder of carnivorous plants, hydrologist, geomorphologist, defence intelligence researcher and then, when all that got a bit rough on the nerves, a serial entrepreneur.
Chris has programmed everything from FORTRAN on a CRAY to Python on a Pi, but generally leans on TypeScript, C#, and SQL for the front, middle and back bits of his applications. His current focus is on ensuring developers know enough about Artificial Intelligence to be dangerous.