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4<title>CoolTrayIcon, ver. 4.3.1</title>
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23
24<a name='Top'><h1>CoolTrayIcon, ver. 4.3.1</h1>
25
26
27<a href='#Properties'>[Properties]</a> <a href='#Methods'>[Methods]</a> <a href='#Events'>[Events]</a>
28<br>
29<a href='#Hints'>[Hints]</a> <a href='#Bugs'>[Known Bugs]</a> <a href='#Comments'>[Comments]</a>
30<br>
31
32
33<p>
34CoolTrayIcon is a tray icon component. It allows you to easily implement tray icons
35in your own applications, with various appearances and behaviors.
36</p>
37
38<!--
39<p>
40CoolTrayIcon can be used in a service. See my <a href='#Service'>developer remarks</a> on services.
41</p>
42-->
43
44
45<a name='Properties'></a><h2>Properties</h2>
46
47<table cellpadding='2' cellspacing='2' border='0' width='100%'>
48<tr>
49 <td class='name' valign='top'>Icon</td>
50 <td class='desc' valign='top'><span class='declaration'>property Icon: TIcon;</span><br>
51 The icon to display in the tray. This icon is 16x16 pixels and 256 colors (16 colors
52 in Win9x and NT). If you use an icon file (*.ico) containing more than one icon,
53 Delphi will use the first icon. If it's not 16x16 it will be scaled, which probably
54 won't look good.<br>
55<!--
56 <b>NOTE:</b> Assigning a new TIcon object to Icon will cause the icon in the tray
57 to redraw. However, this is not the case if you change Icon through the TIcon.Assign
58 method, or change it through TIcon.Handle. In those cases you must call the method
59 Refresh (see below) to redraw it.
60-->
61 </td>
62 <td class='default' valign='top' nowrap><br></td>
63</tr>
64<tr>
65 <td class='name' valign='top'>IconVisible</td>
66 <td class='desc' valign='top'><span class='declaration'>property IconVisible: Boolean;</span><br>
67 Whether to display the icon. This property has no effect in design mode.</td>
68 <td class='default' valign='top' nowrap>Default false</td>
69</tr>
70<tr>
71 <td class='name' valign='top'>Hint</td>
72 <td class='desc' valign='top'><span class='declaration'>type THintString = ShortString;<br>
73 property Hint: THintString;</span><br>
74 The tray icon's hint (max 128 chars), which is displayed when you move the mouse cursor
75 over the tray icon. Use &#35;13 as a separator in multi-line hints.<br>
76 <b>NOTE:</b> WinNT doesn't appear to support multi-line hints.<br>
77 <b>NOTE:</b> On some older Windows versions (before IE 5) the hint is max 64 chars.<br>
78 <b>NOTE:</b> The time until the hint window closes is determined by Windows,
79 so don't bother trying to change the interval, because you can't. Setting
80 Application.HintPause and Application.HintHidePause has no effect.
81 </td>
82 <td class='default' valign='top' nowrap><br></td>
83</tr>
84<tr>
85 <td class='name' valign='top'>ShowHint</td>
86 <td class='desc' valign='top'><span class='declaration'>property ShowHint: Boolean;</span><br>
87 Whether to show the hint.</td>
88 <td class='default' valign='top' nowrap>Default true</td>
89</tr>
90<tr>
91 <td class='name' valign='top'>PopupMenu</td>
92 <td class='desc' valign='top'><span class='declaration'>property PopupMenu: TPopupMenu;</span><br>
93 The popup menu you want to display when the icon is clicked.</td>
94 <td class='default' valign='top' nowrap>Default true</td>
95</tr>
96<tr>
97 <td class='name' valign='top'>LeftPopup</td>
98 <td class='desc' valign='top'><span class='declaration'>property LeftPopup: Boolean;</span><br>
99 Whether you want the popup menu to pop up when you click the left mouse button.
100 Default is false, meaning only the right button will work.<br>
101 <b>NOTE:</b> LeftPopup must be false (or the popup menu unassigned) if you want to
102 double click the tray icon without displaying the popup menu.
103 LeftPopup must be false if you want CoolTrayIcon to handle a menu that has a default
104 menu item.</td>
105 <td class='default' valign='top' nowrap>Default false</td>
106</tr>
107<tr>
108 <td class='name' valign='top'>Enabled</td>
109 <td class='desc' valign='top'><span class='declaration'>property Enabled: Boolean;</span><br>
110 Works like Enabled for other controls, enabling/disabling keyboard and mouse input.
111 Useful when you want to temporarily disable the popup menu, say while you are displaying
112 an about box or some other modal window.</td>
113 <td class='default' valign='top' nowrap>Default true</td>
114</tr>
115<tr>
116 <td class='name' valign='top'>IconList</td>
117 <td class='desc' valign='top'><span class='declaration'>property IconList: TCustomImageList;</span><br>
118 An ImageList containing icons. If it contains other images than icons, the tray icon
119 won't change when using CycleIcons, but no error occurs.<br>
120 <b>NOTE:</b> When you assign to IconList IconIndex is set to 0.<br>
121 <b>NOTE:</b> In D2 and D3 the property is of type TImageList in stead of TCustomImageList.</td>
122 <td class='default' valign='top' nowrap><br></td>
123</tr>
124<tr>
125 <td class='name' valign='top'>IconIndex</td>
126 <td class='desc' valign='top'><span class='declaration'>property IconIndex: Integer;</span><br>
127 The current icon in the assigned iconlist (or 0 if no iconlist is assigned).</td>
128 <td class='default' valign='top' nowrap><br></td>
129</tr>
130<tr>
131 <td class='name' valign='top'>CycleIcons</td>
132 <td class='desc' valign='top'><span class='declaration'>property CycleIcons: Boolean;</span><br>
133 Animates the tray icon by cycling through all the icons stored in IconList and assigning them
134 to Icon. When you set CycleIcons to true, it will begin with the first icon in IconList.<br>
135 <b>NOTE:</b> CycleIcons can be true even though you have no IconList.
136 No cycling will occur in that case, but the cycle timer is still active, which will consume
137 some resources.</td>
138 <td class='default' valign='top' nowrap>Default false</td>
139</tr>
140<tr>
141 <td class='name' valign='top'>CycleInterval</td>
142 <td class='desc' valign='top'><span class='declaration'>property CycleInterval: Cardinal;</span><br>
143 The time interval in milisecs. before selecting a new icon from IconList.</td>
144 <td class='default' valign='top' nowrap><br></td>
145</tr>
146<tr>
147 <td class='name' valign='top'>DesignPreview</td>
148 <td class='desc' valign='top'><span class='declaration'>property DesignPreview: Boolean;</span><br>
149 Enables you to preview the tray icon in design mode. You can watch what the icon looks like,
150 see its hint, enable/disable it, test the popupmenu, and animate it via CycleIcons.<br>
151 <b>NOTE:</b> Set DesignPreview to false to avoid the design time icon appearing when you run
152 your program. This is only a problem in the Delphi IDE, not in the finished exe-file.
153 I couldn't find a way to kill the design icon in run-time, so you'll have to do it yourself.<br>
154 <b>NOTE:</b> Setting DesignPreview in run-time has no effect.</td>
155 <td class='default' valign='top' nowrap>Default false</td>
156</tr>
157<tr>
158 <td class='name' valign='top'>Handle</td>
159 <td class='desc' valign='top'><span class='declaration'>property Handle: HWND;</span><br>
160 The tray icon's handle.</td>
161 <td class='default' valign='top' nowrap><br></td>
162</tr>
163<!--
164<tr>
165 <td class='name' valign='top'>WindowHandle</td>
166 <td class='desc' valign='top'><span class='declaration'>property WindowHandle: HWND;</span><br>
167 The tray icon's window handle.</td>
168 <td class='default' valign='top' nowrap><br></td>
169</tr>
170-->
171<tr>
172 <td class='name' valign='top'>WantEnterExitEvents</td>
173 <td class='desc' valign='top'><span class='declaration'>property WantEnterExitEvents: Boolean;</span><br>
174 Whether you would like to receive the OnMouseEnter and OnMouseExit events.
175 These events require an internal timer to be active, so if you have no use for them
176 set WantEnterExitEvents to false to minimize resource usage.</td>
177 <td class='default' valign='top' nowrap>Default false</td>
178</tr>
179<tr>
180 <td class='name' valign='top'>Behavior</td>
181 <td class='desc' valign='top'><span class='declaration'>type TBehavior = (bhWin95, bhWin2000);<br>
182 property Behavior: TBehavior;</span><br>
183 This property does not affect the tray icon's behavior in any visible way.
184 It determines which messages are dispatched to the application when the user interacts
185 with the tray icon (specifically, right mouse clicks result in a WM_RBUTTONDOWN followed
186 by a WM_RBUTTONUP message in Win95 mode, but in Win2000 mode a WM_CONTEXTMENU, NIN_SELECT,
187 or NIN_KEYSELECT message is dispatched. For details, see the Remarks section on
188 <a href='http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/Shell/reference/functions/shell_notifyicon.asp'>this page</a>).<br>
189 Probably the only case where you should consider changing the value of this property, is
190 when you send messages to the tray icon programmatically, using PostMessage or SendMessage.<br>
191 <b>NOTE:</b> This property is public, not published.</td>
192 <td class='default' valign='top' nowrap>Default bhWin95</td>
193</tr>
194<tr>
195 <td class='name2' valign='top'>MinimizeToTray</td>
196 <td class='desc' valign='top'><i>This property applies only when the owner of the
197 tray icon component is a form.</i><br>
198 <span class='declaration'>property MinimizeToTray: Boolean;</span><br>
199 Whether you want to hide the main form instead of minimizing it. The form will hide
200 and the tray icon will show.</td>
201 <td class='default' valign='top' nowrap>Default false</td>
202</tr>
203</table>
204
205
206
207<a name='Methods'></a><h2>Methods</h2>
208
209<table cellpadding='2' cellspacing='2' border='0' width='100%'>
210<tr>
211 <td class='name' valign='top'>Refresh</td>
212 <td class='desc' valign='top'><span class='declaration'>function Refresh: Boolean;</span><br>
213 Redraws the tray icon.
214<!--
215 May be necessary when changing the icon, depending on how you do it (see above).
216-->
217 You probably don't need to ever call this method.
218 </td>
219 <td class='default' valign='top'>Returns true or false</td>
220</tr>
221<tr>
222 <td class='name' valign='top'>ShowBalloonHint</td>
223 <td class='desc' valign='top'><span class='declaration'>type TBalloonHintIcon = (bitNone, bitInfo, bitWarning, bitError);<br>
224 type TBalloonHintTimeOut = 10..60;<br>
225 function ShowBalloonHint(Title: String; Text: String; IconType: TBalloonHintIcon; TimeoutSecs: TBalloonHintTimeOut): Boolean;</span><br>
226 Shows a balloon hint (a kind of "sticky" popup hint).<br>
227 <b>NOTE:</b> Balloon hints are available in WinME, Win2000, and WinXP only.
228 Calling this method in other Windows versions has no effect.<br>
229 <b>NOTE:</b> You can use up to 64 chars for the title and up to 255 chars for the text.
230 The hint is visible for 10-60 seconds, or until the user clicks it (or until you
231 programmatically hide it). You cannot show a balloon hint if the tray icon is not showing,
232 and hiding the tray icon hides any balloon hint.<br>
233 <b>NOTE:</b> The HideBalloonHint method is automatically called by ShowBalloonHint,
234 so you don't get multiple balloon hints.</td>
235 <td class='default' valign='top'>Returns true or false</td>
236</tr>
237<tr>
238 <td class='name' valign='top'>HideBalloonHint</td>
239 <td class='desc' valign='top'><span class='declaration'>function HideBalloonHint: Boolean;</span><br>
240 Hides the balloon hint (if any).</td>
241 <td class='default' valign='top'>Returns true or false</td>
242</tr>
243<tr>
244 <td class='name' valign='top'>PopupAtCursor</td>
245 <td class='desc' valign='top'><span class='declaration'>procedure PopupAtCursor;</span><br>
246 Pops up the associated popupmenu (if any). This method is usually called automatically
247 in response to an OnClick event, but you can call it manually if you want the popupmenu
248 to appear at other times. The menu will appear at the current cursor coordinates.</td>
249 <td class='default' valign='top'><br></td>
250</tr>
251<tr>
252 <td class='name' valign='top'>BitmapToIcon</td>
253 <td class='desc' valign='top'><span class='declaration'>function BitmapToIcon(const Bitmap: TBitmap; const Icon: TIcon; MaskColor: TColor): Boolean;</span><br>
254 Renders and returns an existing icon based on the bitmap given as parameter.
255 The bitmap should be 16x16 pixels. Specify a color to be shown transparently or clNone
256 for no transparency.<br>
257 <b>NOTE:</b> Bitmaps that are not exactly 16x16 will be scaled up or down.</td>
258 <td class='default' valign='top'>Returns true or false</td>
259</tr>
260<tr>
261 <td class='name' valign='top'>GetTooltipHandle</td>
262 <td class='desc' valign='top'><span class='declaration'>function GetTooltipHandle: HWND;</span><br>
263 All tray icons share the same tooltip window (the hint popup).
264 This method returns the tooltip handle.</td>
265 <td class='default' valign='top'>Returns handle or 0 if error</td>
266</tr>
267<tr>
268 <td class='name' valign='top'>GetBalloonHintHandle</td>
269 <td class='desc' valign='top'><span class='declaration'>function GetBalloonHintHandle: HWND;</span><br>
270 All applications share the same balloon hint (if supported by the Windows version).
271 This method returns the balloon hint handle.</td>
272 <td class='default' valign='top'>Returns handle or 0 if error</td>
273</tr>
274<tr>
275 <td class='name' valign='top'>GetClientIconPos</td>
276 <td class='desc' valign='top'><span class='declaration'>function GetClientIconPos(X, Y: Integer): TPoint;</span><br>
277 Returns the cursor position <i>inside</i> the tray icon.
278 Will return coordinates between (-1,-1) and (16,16).
279 You would expect the coordinates to vary between 0 and 15, but Windows adds a border
280 1 pixel wide to all tray icons, which is appparently considered to be part of the tray icons.
281 Depending on whether the tray icon has other tray icons as neighbours to the left, right,
282 top, or bottom, the border is inserted as Windows sees fit.
283 So in other words, <i>this method is not exact</i>. You should expect a variation of 2 pixels.
284 If anyone sees a way to patch this, let me know.</td>
285 <td class='default' valign='top'>Returns position in a TPoint</td>
286</tr>
287<tr>
288 <td class='name2' valign='top'>ShowMainForm</td>
289 <td class='desc' valign='top'><i>This method applies only when the owner of the
290 tray icon component is a form.</i><br>
291 <span class='declaration'>procedure ShowMainForm;</span><br>
292 Shows the main form.<br>
293 <b>NOTE:</b> It is important that you use this method when displaying the form,
294 as it contains important calls that affect how the form and the application display
295 themselves. See the demo app.</td>
296 <td class='default' valign='top'><br></td>
297</tr>
298<tr>
299 <td class='name2' valign='top'>HideMainForm</td>
300 <td class='desc' valign='top'><i>This method applies only when the owner of the
301 tray icon component is a form.</i><br>
302 <span class='declaration'>procedure HideMainForm;</span><br>
303 Hides the main form.</td>
304 <td class='default' valign='top'><br></td>
305</tr>
306<tr>
307 <td class='name2' valign='top'>ShowTaskbarIcon</td>
308 <td class='desc' valign='top'><i>This method applies only when the owner of the
309 tray icon component is a form.</i><br>
310 <span class='declaration'>procedure ShowTaskbarIcon;</span><br>
311 Shows the application's taskbar icon (not to be confused with the tray icon).<br>
312 <td class='default' valign='top'><br></td>
313</tr>
314<tr>
315 <td class='name2' valign='top'>HideTaskbarIcon</td>
316 <td class='desc' valign='top'><i>This method applies only when the owner of the
317 tray icon component is a form.</i><br>
318 <span class='declaration'>procedure HideTaskbarIcon;</span><br>
319 Hides the application's taskbar icon (not to be confused with the tray icon).<br>
320 <b>NOTE:</b> If you display a child form the taskbar icon will become visible again
321 automatically. This is standard Windows behavior.</td>
322 <td class='default' valign='top'><br></td>
323</tr>
324</table>
325
326
327
328<a name='Events'></a><h2>Events</h2>
329
330<table cellpadding='2' cellspacing='2' border='0' width='100%'>
331<tr>
332 <td class='name' valign='top'>OnClick</td>
333 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
334 Works like the similar event for window controls.<br>
335 <b>NOTE:</b> The Click event corresponds to a MouseDown followed by a MouseUp.
336 If no DblClick event is assigned the Click event fires immediately (ie. after
337 the MouseUp). Otherwise it will wait for a small period of time to see if the
338 user clicks again, in which case we have a double click. If no DblClick event
339 is assigned a double click will actually cause the Click event to fire.
340 This is intentional.</td>
341</tr>
342<tr>
343 <td class='name' valign='top'>OnDblClick</td>
344 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
345 Works like the similar event for window controls.</td>
346</tr>
347<tr>
348 <td class='name' valign='top'>OnMouseDown</td>
349 <td class='desc' valign='top'><span class='declaration'>TMouseEvent;</span><br>
350 Works like the similar event for window controls.</td>
351</tr>
352<tr>
353 <td class='name' valign='top'>OnMouseUp</td>
354 <td class='desc' valign='top'><span class='declaration'>TMouseEvent;</span><br>
355 Works like the similar event for window controls.</td>
356</tr>
357<tr>
358 <td class='name' valign='top'>OnMouseMove</td>
359 <td class='desc' valign='top'><span class='declaration'>TMouseMoveEvent;</span><br>
360 Works like the similar event for window controls.</td>
361</tr>
362<tr>
363 <td class='name' valign='top'>OnMouseEnter</td>
364 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
365 Fired after the cursor enters the tray icon. Requires
366 the WantEnterExitEvents property to be true.</td>
367</tr>
368<tr>
369 <td class='name' valign='top'>OnMouseExit</td>
370 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
371 Fired after the cursor leaves the tray icon. Requires
372 the WantEnterExitEvents property to be true.</td>
373</tr>
374<tr>
375 <td class='name' valign='top'>OnCycle</td>
376 <td class='desc' valign='top'><span class='declaration'>procedure(Sender: TObject; NextIndex: Integer) of object;</span><br>
377 Fired just before the icon changes via CycleIcons.
378 Returns the next index in the assigned imagelist.</td>
379</tr>
380<tr>
381 <td class='name' valign='top'>OnBalloonHintShow</td>
382 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
383 Fired after the balloon hint shows itself. This doesn't have to occur immediately
384 after you call the ShowBalloonHint method. In case another application is already
385 showing a balloon hint, your application must wait for it to close before it gets
386 to show the balloon hint itself. This event will tell you when it has shown the hint.</td>
387</tr>
388<tr>
389 <td class='name' valign='top'>OnBalloonHintHide</td>
390 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
391 Fired after the balloon hint closes because another application needs to show a
392 balloon hint, or because you called either the ShowBalloonHint or the
393 HideBalloonHint method.</td>
394</tr>
395<tr>
396 <td class='name' valign='top'>OnBalloonHintTimeout</td>
397 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
398 Fired after the balloon hint closes because it timed out.</td>
399</tr>
400<tr>
401 <td class='name' valign='top'>OnBalloonHintClick</td>
402 <td class='desc' valign='top'><span class='declaration'>TNotifyEvent;</span><br>
403 Fired when the user clicks the balloon hint.</td>
404</tr>
405<tr>
406 <td class='name2' valign='top'>OnMinimizeToTray</td>
407 <td class='desc' valign='top'><i>This event applies only when the owner of the
408 tray icon component is a form.</i><br>
409 <span class='declaration'>TNotifyEvent;</span><br>
410 Fired when the application is about to minimize to tray. Useful if you want to do special
411 processing, like animation effects, when the app. gets minimized (hidden).<br>
412 <b>NOTE:</b> MinimizeToTray must be true for this event to fire.</td>
413</tr>
414<tr>
415 <td class='name2' valign='top'>OnStartup</td>
416 <td class='desc' valign='top'><i>This event applies only when the owner of the
417 tray icon component is a form.</i><br>
418 <span class='declaration'>procedure(Sender: TObject; var ShowMainForm: Boolean) of object;</span><br>
419 Fired initially at application startup when the main form is about to display.
420 Set the ShowMainForm parameter to false if you don't want the form to display.<br>
421 <b>NOTE:</b> May fire multiple times for an MDI form (once for every child form
422 created at startup).<br>
423 <b>NOTE:</b> This event occurs before the form's OnCreate method (if used with a form).<br>
424 <b>NOTE:</b> Replaces the StartMinimized property found in earlier versions.</td>
425</tr>
426</table>
427
428
429
430<a name='Hints'></a><h2>Hints</h2>
431
432<ul>
433<li><b>How do I start my app. with the tray icon visible and the main form invisible?</b><br>
434At design time set IconVisible to true and set the form's Visible property to false.
435Set the ShowMainForm parameter to false in the OnStartup event. See the StartHidden demo.
436</li>
437
438<li><b>What is the proper way to restore the form?</b><br>
439ALWAYS use the method ShowMainForm! This method contains important calls that affect
440how the form and the application display themselves. Simply setting the form visible
441or calling Application.Restore is not enough. A common symptom is the form with tabpages
442that don't update themselves because ShowMainForm wasn't used.
443</li>
444
445<li><b>I used the OnStartup event to hide the form, but I can still see a quick flash on
446the taskbar when the app. is starting?</b><br>
447If it bothers you you can set the Application.ShowMainForm property in the main
448project source, like this:
449 <pre> .....
450 Application.Initialize;
451 Application.ShowMainForm := False;
452 .....</pre>
453</li>
454
455<li><b>Why does the tray icon not appear in my NT/2000/XP service app.?</b><br>
456Set the service's Interactive property to true and set IconVisible to true.
457See also the <a href='#Bugs'>bugs</a> section concerning services in NT4.
458</li>
459
460<li><b>I want multiple tray icons in my app.?</b><br>
461Just create a CoolTrayIcon object for each tray icon you want. The component is optimized
462to share resources between the tray icons.
463</li>
464
465<li><b>How do I send a message to the tray icon through code?</b><br>
466Use PostMessage or SendMessage and specify the message as the LParam parameter.
467Here's an example of sending a WM_LBUTTONDOWN message, invoking the tray icon's
468OnMouseDown event:
469 <pre> PostMessage(CoolTrayIcon1.Handle, WM_TRAYNOTIFY, Integer(CoolTrayIcon1), WM_LBUTTONDOWN);</pre>
470</li>
471
472<li><b>I want to hide ALL windows, including dialogs and popup forms?</b><br>
473Minimize the app. before calling HideMainForm, like this:
474 <pre>
475 Application.Minimize;
476 CoolTrayIcon1.HideMainForm;</pre>
477</li>
478
479<li><b>I want to override the "hide inactive tray icons" feature in WinXP?</b><br>
480I don't know exactly how to do this, but try refreshing the tray icon at regular
481intervals. Anyway, it's not a good idea to override standard Windows behavior.
482</li>
483
484<li><b>When does the OnStartup event occur?</b><br>
485The OnStartup event occurs before the owner form's OnCreate event.
486</li>
487</ul>
488
489
490
491<a name='Bugs'></a><h2>Known Bugs</h2>
492
493<ul>
494<!--
495<li>Someone complains the component's hint will not show when CycleIcons is true.
496This happens in WinME. I've been unable to reproduce this error, but please tell me if
497you get it.
498</li>
499-->
500<!--
501<li>CoolTrayIcon has previously had a bug that prevented the user from logging off
502unless he manually terminated the application CoolTrayIcon was used in.
503This should be fixed by now, but if not, please tell me.
504</li>
505-->
506<li>The tray icon may disappear in NT4 if it is used in an interactive service and
507you log off, then log back on. I've been trying to fix this, but have so far been
508unsuccessful.
509An explanation for why the problem occurs can be found
510<a href='http://support.microsoft.com/default.aspx?scid=kb;EN-US;q238721'>here</a>.
511(BTW: some service packs, like SP6 seem to fix this problem).
512</li>
513
514<li>Some people report that the balloon hint events never fire. This is a Win2000 issue.
515It doesn't appear to matter which service pack, Internet Explorer version, or comctl32.dll
516version you use. This makes me suspect that Win2000 simply does not support these events.
517</li>
518
519<li>Occasionally someone reports that an application using CoolTrayIcon prevents the
520user from logging off or shutting down until he manually terminates the application.
521I've more or less come to the conclusion that this is not a bug in CoolTrayIcon.
522More likely it's a bug in some other third party component. At least it seems
523people always get this error when they use CoolTrayIcon together with other
524third party components. If you get this error try removing the other components
525one at a time and see if that doesn't solve the problem (or even simpler - run my
526demo app. and see if it has the problem). Afterwards, if you still have reason to
527believe CoolTrayIcon is the problem, don't hesitate to tell me, but please perform
528this simple test of exclusion first. (NOTE: It would seem various components in
529Delphi's FastNet collection have this problem - independently of CoolTrayIcon).
530<br><br>
531Also make sure you use CoolTrayIcon correctly. If your app. &quot;closes to tray&quot;
532(goes to the tray when the user clicks the form's close button) you need to handle
533the WM_QUERYENDSESSION message manually, or the app. (unsurprisingly) won't terminate
534when Windows shuts down. See the source in the CoolTrayTest demo for a solution.
535</li>
536
537<li>One person has reported that the default icon that is created when you add a
538CoolTrayIcon component to your application is invalid. You get a runtime error:
539&quot;Error reading CoolTrayIcon1.Icon.Data: The parameter is incorrect.&quot;.
540I've not had anyone else report this, but please tell me if it happens to you.
541To get around it, simply assign an icon to the Icon property.
542</li>
543</ul>
544
545
546
547<a name='Comments'></a><h2>Comments</h2>
548
549The CoolTrayIcon component is <i>freeware</i>. Feel free to use and improve it,
550but <i>please include all original files if you redistribute the zip-file</i>.
551If you have any comments or corrections to the component I would very much like
552to hear them. A lot of Delphi programmers have already told me they like the
553component and use it, which is a huge boost for my ego. Thanks a lot, guys -
554especially those of you who gave suggestions and pointed out the bugs.
555</p>
556
557<p>
558If you use the component some credit somewhere in your app. would be a nice gesture,
559but it is not a requirement.
560</p>
561
562<p>
563The component should work on any Windows platform (Win9x, ME, NT, 2000, XP).
564If you experience any problems related to the operating system you use, please tell me.
565Also, it should work in Delphi 3 and up (Delphi 2?) and C++Builder 3 and up.
566Again, tell me if I'm wrong.
567</p>
568
569<p>
570<a name='Service'></a><b>A word about services:</b> CoolTrayIcon does not require its
571owner to be a form. This allows you to use it for non-windowed apps. such as services.
572Some of the properties, methods, and events don't make sense without a form, but rather
573than creating a superclass without these properties/methods/events I've simply let them
574stay in CoolTrayIcon itself. You can use them in your service app., but they will not do
575anything. I figured the component would be more flexible and easier to extend into
576subclasses this way.
577</p>
578
579<p>
580Get the latest version from <a href='http://www3.brinkster.com/troels/delphi.asp' target='_blank'>
581http://www3.brinkster.com/troels/delphi.asp</a>.
582</p>
583
584<p>
585Troels Jakobsen<br>
586<a href='mailto:delphiuser@get2net.dk'>delphiuser@get2net.dk</a>
587</p>
588
589</body>
590</html>
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