屏幕右下角的类似QQ的功能如何实现呢？(100分)

屏幕右下角的类似QQ、KV3000、金山词霸的功能如何实现呢？

什么功能？ TrayIcon??

那是托盘图标,使用API函数,老大
找本参考书都可以看得到

你在论坛里面搜索一下,我敢打赌,不会少于10000个符合条件的记录

{
This is a component for placing icons in the notification area
of the Windows taskbar (aka. the traybar).

The component is freeware. Feel free to use and improve it.
I would be pleased to hear what you think.

Troels Jakobsen - tjak@get2net.dk
}
unit CoolTrayIcon;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Menus, ShellApi, extctrls;

const
{ User-defined message sent from the icon. Some low user-defined
messages are used by Windows itself! (WM_USER+1 = DM_SETDEFID). }
WM_TRAYNOTIFY = WM_USER + 1024;
IconID = 1;

type
TCycleEvent = procedure(Sender: TObject; Current: Integer) of object;
TMainFormMinimizeEvent = procedure(Sender: TObject; var GotoTray: Boolean) of object;

TCoolTrayIcon = class(TComponent)
private
FEnabled: Boolean;
FIcon: TIcon;
FIconVisible: Boolean;
FHint: String;
FShowHint: Boolean;
FPopupMenu: TPopupMenu;
FLeftPopup: Boolean;
FOnClick,
FOnDblClick: TNotifyEvent;
FOnCycle: TCycleEvent;
FOnMouseDown,
FOnMouseUp: TMouseEvent;
FOnMouseMove: TMouseMoveEvent;
FStartMinimized: Boolean;
FMinimizeToTray: Boolean;
HasShown: Boolean;
FClicked: Boolean;
CycleTimer: TTimer; // For icon cycling
FDesignPreview: Boolean;
SettingPreview: Boolean;
FIconList: TImageList;
FCycleIcons: Boolean;
FCycleInterval: Cardinal;
IconIndex: Integer; // Current index in imagelist
OldAppProc, NewAppProc: Pointer; // Procedure variables
procedure SetCycleIcons(Value: Boolean);
procedure SetDesignPreview(Value: Boolean);
procedure SetCycleInterval(Value: Cardinal);
procedure TimerCycle(Sender: TObject);
procedure HandleIconMessage(var Msg: TMessage);
function InitIcon: Boolean;
procedure SetIcon(Value: TIcon);
procedure SetIconVisible(Value: Boolean);
procedure SetHint(Value: String);
procedure SetShowHint(Value: Boolean);
procedure PopupAtCursor;
procedure HookApp;
procedure UnhookApp;
procedure HookAppProc(var Message: TMessage);
protected
IconData: TNotifyIconData; // Data of the tray icon wnd.
procedure Loaded; override;
function ShowIcon: Boolean; virtual;
function HideIcon: Boolean; virtual;
function ModifyIcon: Boolean; virtual;
procedure Click; dynamic;
procedure DblClick; dynamic;
procedure CycleIcon; dynamic;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer); dynamic;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer); dynamic;
procedure MouseMove(Shift: TShiftState; X, Y: Integer); dynamic;
procedure DoMinimizeToTray; dynamic;
procedure Notification(AComponent: TComponent; Operation: TOperation);
override;
public
property Handle: HWND read IconData.wnd;
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure ShowMainForm;
procedure HideMainForm;
procedure Refresh;
published
// Properties:
property DesignPreview: Boolean read FDesignPreview
write SetDesignPreview default False;
property IconList: TImageList read FIconList write FIconList;
property CycleIcons: Boolean read FCycleIcons write SetCycleIcons
default False;
property CycleInterval: Cardinal read FCycleInterval
write SetCycleInterval;
property Enabled: Boolean read FEnabled write FEnabled default True;
property Hint: String read FHint write SetHint;
property ShowHint: Boolean read FShowHint write SetShowHint;
property Icon: TIcon read FIcon write SetIcon stored True;
property IconVisible: Boolean read FIconVisible write SetIconVisible
default True;
property PopupMenu: TPopupMenu read FPopupMenu write FPopupMenu;
property LeftPopup: Boolean read FLeftPopup write FLeftPopup
default False;
property StartMinimized: Boolean read FStartMinimized write FStartMinimized
default False; // Main form minimized on appl. start-up?
property MinimizeToTray: Boolean read FMinimizeToTray write FMinimizeToTray
default False; // Minimize main form to tray when minimizing?
// Events:
property OnClick: TNotifyEvent read FOnClick write FOnClick;
property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick;
property OnMouseDown: TMouseEvent read FOnMouseDown write FOnMouseDown;
property OnMouseUp: TMouseEvent read FOnMouseUp write FOnMouseUp;
property OnMouseMove: TMouseMoveEvent read FOnMouseMove write FOnMouseMove;
property OnCycle: TCycleEvent read FOnCycle write FOnCycle;
end;

procedure Register;

implementation

{--------------------- TCoolTrayIcon ----------------------}

constructor TCoolTrayIcon.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FIconVisible := True; // Visible by default
FEnabled := True; // Enabled by default
HasShown := False; // The main form has not been shown before
SettingPreview := False;

FIcon := TIcon.Create;
IconData.cbSize := SizeOf(TNotifyIconData);
// IconData.wnd points to procedure to receive callback messages from the icon
IconData.wnd := AllocateHWnd(HandleIconMessage);
// Add an id for the tray icon
IconData.uId := IconID;
// We want icon, message handling, and tooltips
IconData.uFlags := NIF_ICON + NIF_MESSAGE + NIF_TIP;
// Message to send to IconData.wnd when mouse event occurs
IconData.uCallbackMessage := WM_TRAYNOTIFY;

CycleTimer := TTimer.Create(Self);
CycleTimer.Enabled := False;
CycleTimer.Interval := FCycleInterval;
CycleTimer.OnTimer := TimerCycle;

if not (csDesigning in ComponentState) then
HookApp;
end;


destructor TCoolTrayIcon.Destroy;
begin
SetIconVisible(False); // Remove the icon from the tray
FIcon.Free; // Free the icon
DeallocateHWnd(IconData.Wnd); // Free the tray window
CycleTimer.Free;
// It is important to unhook any hooked processes
if not (csDesigning in ComponentState) then
UnhookApp;
inherited Destroy;
end;


procedure TCoolTrayIcon.Loaded;
{ This method is called when all properties of the component have been
initialized. The method SetIconVisible must be called here, after the
tray icon (FIcon) has loaded itself. Otherwise, the tray icon will
be blank (no icon image). }
begin
inherited Loaded; // Always call inherited Loaded first
SetIconVisible(FIconVisible);
if (StartMinimized) and not (csDesigning in ComponentState) then
begin
Application.ShowMainForm := False;
ShowWindow(Application.Handle, SW_HIDE);
end;
ModifyIcon;
end;


procedure TCoolTrayIcon.Notification(AComponent: TComponent;
Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
{ Check if either the imagelist or the popup menu
is about to be deleted }
if (AComponent = IconList) and (Operation = opRemove) then
IconList := nil;
if (AComponent = PopupMenu) and (Operation = opRemove) then
PopupMenu := nil;
end;


{ For MinimizeToTray to work, we need to know when the form is minimized
(happens when either the application or the main form minimizes).
The straight-forward way is to make TCoolTrayIcon trap the
Application.OnMinimize event. However, if you also make use of this
event in the application, the OnMinimize code used by TCoolTrayIcon
is discarded.
The alternative is to hook into the app.'s message handling (via
HookApp). You can then catch any message that goes through the app.
and still use the OnMinimize event. }

procedure TCoolTrayIcon.HookApp;
begin
// Hook the application
OldAppProc := Pointer(GetWindowLong(Application.Handle, GWL_WNDPROC));
NewAppProc := MakeObjectInstance(HookAppProc);
SetWindowLong(Application.Handle, GWL_WNDPROC, LongInt(NewAppProc));
end;


procedure TCoolTrayIcon.UnhookApp;
begin
if Assigned(OldAppProc) then
SetWindowLong(Application.Handle, GWL_WNDPROC, LongInt(OldAppProc));
if Assigned(NewAppProc) then
FreeObjectInstance(NewAppProc);
NewAppProc := nil;
OldAppProc := nil;
end;


{ All app. messages pass through HookAppProc. You can override the
messages by not passing them along to Windows (via CallWindowProc). }

procedure TCoolTrayIcon.HookAppProc(var Message: TMessage);
begin
with Message do
begin
case Msg of
WM_SIZE:
if wParam = SIZE_MINIMIZED then
begin
if FMinimizeToTray then
DoMinimizeToTray;
{ It is tempting to insert a minimize event here, but it would behave
exactly like Application.OnMinimize, so I see no need for it. }
end;
end;

Result := CallWindowProc(OldAppProc, Application.Handle, Msg, wParam, lParam);
end;
end;


{ You can hook into the main form (or any other window) just as easily
as hooking into the app., allowing you to handle any message that
window processes. Uncomment the procedures HookParent and UnhookParent
below if you want to hook the main form. Remember to unhook when the
app. terminates, or Bad Things may happen. }
{
procedure TCoolTrayIcon.HookParent;
begin
if Assigned(Owner as TWinControl) then
begin
// Hook the parent window
OldWndProc := Pointer(GetWindowLong((Owner as TWinControl).Handle, GWL_WNDPROC));
NewWndProc := MakeObjectInstance(HookWndProc);
SetWindowLong((Owner as TWinControl).Handle, GWL_WNDPROC, LongInt(NewWndProc));
end;
end;


procedure TCoolTrayIcon.UnhookParent;
begin
if ((Owner as TWinControl) <> nil) and Assigned(OldWndProc) then
SetWindowLong((Owner as TWinControl).Handle, GWL_WNDPROC, LongInt(OldWndProc));
if Assigned(NewWndProc) then
FreeObjectInstance(NewWndProc);
NewWndProc := nil;
OldWndProc := nil;
end;
}


{ HandleIconMessage handles messages that go to the shell notification
window (tray icon) itself. Most messages are passed through WM_TRAYNOTIFY.
Use lParam to get the actual message, eg. WM_MOUSEMOVE.
Sends the usual Delphi events for the mouse messages. Also interpolates
the OnClick event when the user clicks the left button, and makes the
menu (if any) popup on left and right mouse down events. }

procedure TCoolTrayIcon.HandleIconMessage(var Msg: TMessage);

function ShiftState: TShiftState;
// Return the state of the shift, ctrl, and alt keys
begin
Result := [];
if GetKeyState(VK_SHIFT) < 0 then
Include(Result, ssShift);
if GetKeyState(VK_CONTROL) < 0 then
Include(Result, ssCtrl);
if GetKeyState(VK_MENU) < 0 then
Include(Result, ssAlt);
end;

var
Pt: TPoint;
Shift: TShiftState;
I: Integer;
M: TMenuItem;
begin
if Msg.Msg = WM_TRAYNOTIFY then
// Take action if a message from the icon comes through
begin
case Msg.lParam of

WM_MOUSEMOVE:
if FEnabled then
begin
Shift := ShiftState;
GetCursorPos(Pt);
MouseMove(Shift, Pt.X, Pt.Y);
end;

WM_LBUTTONDOWN:
if FEnabled then
begin
Shift := ShiftState + [ssLeft];
GetCursorPos(Pt);
MouseDown(mbLeft, Shift, Pt.X, Pt.Y);
FClicked := True;
if FLeftPopup then
PopupAtCursor;
end;

WM_RBUTTONDOWN:
if FEnabled then
begin
Shift := ShiftState + [ssRight];
GetCursorPos(Pt);
MouseDown(mbRight, Shift, Pt.X, Pt.Y);
PopupAtCursor;
end;

WM_MBUTTONDOWN:
if FEnabled then
begin
Shift := ShiftState + [ssMiddle];
GetCursorPos(Pt);
MouseDown(mbMiddle, Shift, Pt.X, Pt.Y);
end;

WM_LBUTTONUP:
if FEnabled then
begin
Shift := ShiftState + [ssLeft];
GetCursorPos(Pt);
if FClicked then // Then WM_LBUTTONDOWN was called before
begin
FClicked := False;
Click;
end;
MouseUp(mbLeft, Shift, Pt.X, Pt.Y);
end;

WM_RBUTTONUP:
if FEnabled then
begin
Shift := ShiftState + [ssRight];
GetCursorPos(Pt);
MouseUp(mbRight, Shift, Pt.X, Pt.Y);
end;

WM_MBUTTONUP:
if FEnabled then
begin
Shift := ShiftState + [ssMiddle];
GetCursorPos(Pt);
MouseUp(mbMiddle, Shift, Pt.X, Pt.Y);
end;

WM_LBUTTONDBLCLK:
if FEnabled then
begin
DblClick;
{ Handle default menu items. But only if LeftPopup is false,
or it will conflict with the popupmenu, when it is called
by a click event. }
M := nil;
if Assigned(FPopupMenu) then
if (FPopupMenu.AutoPopup) and (not FLeftPopup) then
for I := PopupMenu.Items.Count -1 downto 0 do
begin
if PopupMenu.Items.Default then
M := PopupMenu.Items;
end;
if M <> nil then
M.Click;
end;
end;
end

else // Messages that didn't go through the icon
case Msg.Msg of
WM_QUERYENDSESSION: Msg.Result := 1;
{ Evaluate WM_QUERYENDSESSION message to tell Windows that the
icon will stop executing if user requests a shutdown (Msg.Result
must not return 0, or the system will not be able to shut down). }
else // Handle all other messages with the default handler
Msg.Result := DefWindowProc(IconData.Wnd, Msg.Msg, Msg.wParam, Msg.lParam);
end;
end;


procedure TCoolTrayIcon.SetIcon(Value: TIcon);
begin
FIcon.Assign(Value);
ModifyIcon;
end;


procedure TCoolTrayIcon.SetIconVisible(Value: Boolean);
begin
if Value then
ShowIcon
else
HideIcon;
end;


procedure TCoolTrayIcon.SetDesignPreview(Value: Boolean);
begin
FDesignPreview := Value;
SettingPreview := True; // Raise flag
SetIconVisible(Value);
SettingPreview := False; // Clear flag
end;


procedure TCoolTrayIcon.SetCycleIcons(Value: Boolean);
begin
FCycleIcons := Value;
if Value then
IconIndex := 0;
CycleTimer.Enabled := Value;
end;


procedure TCoolTrayIcon.SetCycleInterval(Value: Cardinal);
begin
FCycleInterval := Value;
CycleTimer.Interval := FCycleInterval;
end;


procedure TCoolTrayIcon.SetHint(Value: String);
begin
FHint := Value;
ModifyIcon;
end;


procedure TCoolTrayIcon.SetShowHint(Value: Boolean);
begin
FShowHint := Value;
ModifyIcon;
end;


function TCoolTrayIcon.InitIcon: Boolean;
// Set icon and tooltip
var
ok: Boolean;
begin
Result := False;
ok := True;
if (csDesigning in ComponentState) {or
(csLoading in ComponentState)} then
begin
if SettingPreview then
ok := True
else
ok := FDesignPreview
end;

if ok then
begin
IconData.hIcon := FIcon.Handle;
if (FHint <> '') and (FShowHint) then
StrLCopy(IconData.szTip, PChar(FHint), SizeOf(IconData.szTip))
// StrLCopy must be used since szTip is only 64 bytes
else
IconData.szTip := '';
Result := True;
end;
end;


function TCoolTrayIcon.ShowIcon: Boolean;
// Add/show the icon on the tray
begin
Result := False;
if not SettingPreview then
FIconVisible := True;
begin
if (csDesigning in ComponentState) {or
(csLoading in ComponentState)} then
begin
if SettingPreview then
if InitIcon then
Result := Shell_NotifyIcon(NIM_ADD, @IconData);
end
else
if InitIcon then
Result := Shell_NotifyIcon(NIM_ADD, @IconData);
end;
end;


function TCoolTrayIcon.HideIcon: Boolean;
// Remove/hide the icon from the tray
begin
Result := False;
if not SettingPreview then
FIconVisible := False;
begin
if (csDesigning in ComponentState) {or
(csLoading in ComponentState)} then
begin
if SettingPreview then
if InitIcon then
Result := Shell_NotifyIcon(NIM_DELETE, @IconData);
end
else
if InitIcon then
Result := Shell_NotifyIcon(NIM_DELETE, @IconData);
end;
end;


function TCoolTrayIcon.ModifyIcon: Boolean;
// Change icon or tooltip if icon already placed
begin
Result := False;
if InitIcon then
Result := Shell_NotifyIcon(NIM_MODIFY, @IconData);
end;


procedure TCoolTrayIcon.TimerCycle(Sender: TObject);
begin
if Assigned(FIconList) then
begin
FIconList.GetIcon(IconIndex, FIcon);
CycleIcon; // Call event method
ModifyIcon;

if IconIndex < FIconList.Count-1 then
Inc(IconIndex)
else
IconIndex := 0;
end;
end;


procedure TCoolTrayIcon.ShowMainForm;
var
I, J: Integer;
begin
// Show application's TASKBAR icon (not the traybar icon)
ShowWindow(Application.Handle, SW_RESTORE);
// Show the form itself
ShowWindow(Application.MainForm.Handle, SW_RESTORE);
// Application.MainForm.BringToFront;

{ If the main form has not been shown before (if StartMinimized
was true (Application.ShowMainForm was false on startup)),
it's necessary to force the form's controls to show, as they
have been created invisible (regardless of the value of their
Visible property). This is done via ShowWindow and a lot of
loops. }
{ By the way: TForm.Position has no effect if StartMinimized
is true. Kind of stupid. }
if not HasShown then // This block is only executed once
begin
for I := 0 to Application.MainForm.ComponentCount -1 do
if Application.MainForm.Components is TWinControl then
with Application.MainForm.Components as TWinControl do
if Visible then
begin
// Show this control
ShowWindow(Handle, SW_SHOWDEFAULT);
// Now show child controls owned by this control
for J := 0 to ComponentCount -1 do
if Components[J] is TWinControl then
ShowWindow((Components[J] as TWinControl).Handle, SW_SHOWDEFAULT);
end;
HasShown := True; // The main form has now been shown
end;
end;


procedure TCoolTrayIcon.HideMainForm;
begin
// Hide application's TASKBAR icon (not the traybar icon)
ShowWindow(Application.Handle, SW_HIDE);
// Hide the form itself
ShowWindow(Application.MainForm.Handle, SW_HIDE);
end;


procedure TCoolTrayIcon.Refresh;
// Refresh the icon
begin
ModifyIcon;
end;


procedure TCoolTrayIcon.PopupAtCursor;
var
CursorPos: TPoint;
begin
if Assigned(PopupMenu) then
if PopupMenu.AutoPopup then
if GetCursorPos(CursorPos) then
begin
{ Win98 (but not Win95/WinNT) seems to empty a popup menu before
closing it. This is a problem when the menu is about to display
while it already is active (two click-events following each
other). The menu will flicker annoyingly.
Calling ProcessMessages fixes this. }
Application.ProcessMessages;
SetForegroundWindow(Application.MainForm.Handle);
PopupMenu.PopupComponent := Self;
PopupMenu.Popup(CursorPos.X, CursorPos.Y);
PostMessage(Application.MainForm.Handle, WM_NULL, 0, 0);
end;
end;


procedure TCoolTrayIcon.Click;
begin
// Execute user-assigned method
if Assigned(FOnClick) then
FOnClick(Self);
end;


procedure TCoolTrayIcon.DblClick;
begin
// Execute user-assigned method
if Assigned(FOnDblClick) then
FOnDblClick(Self);
end;


procedure TCoolTrayIcon.MouseDown(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer);
begin
// Execute user-assigned method
if Assigned(FOnMouseDown) then
FOnMouseDown(Self, Button, Shift, X, Y);
end;


procedure TCoolTrayIcon.MouseUp(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer);
begin
// Execute user-assigned method
if Assigned(FOnMouseUp) then
FOnMouseUp(Self, Button, Shift, X, Y);
end;


procedure TCoolTrayIcon.MouseMove(Shift: TShiftState; X, Y: Integer);
begin
// Execute user-assigned method
if Assigned(FOnMouseMove) then
FOnMouseMove(Self, Shift, X, Y);
end;


procedure TCoolTrayIcon.CycleIcon;
begin
// Execute user-assigned method
if Assigned(FOnCycle) then
FOnCycle(Self, IconIndex);
end;


procedure TCoolTrayIcon.DoMinimizeToTray;
begin
// Override this method to change automatic tray minimizing behavior
HideMainForm;
IconVisible := True;
end;


procedure Register;
begin
RegisterComponents('Custom', [TCoolTrayIcon]);
end;

end.

上面那个PAS文件是TRAYICON的组件，把这段COPY下来做成PAS文件，到DELPHI里安装一下，就可以了，保证满足
你的要求，其实如果用c++ builder的话，c++ builder自带的就有类似的一个组件

CoolTrayIcon v3.1.1 FWS 619K 2001-8-13
作者: Troels Jakobsen. CoolTrayIcon的最新版本

完整功能. 源代码: 有
适用于 CB3 CB4 CB5 D2 D3 D4 D5 D6
已下载2004次


http://www.delphibyte.com/download/softdown.php?softid=454&amp;url=http://www.torry.net/vcl/system/trayicons/trayicon.zip

下载CoolTray吗！最好用了。

我的网站有原代码
yysq.126.com

托盘功能调用一个API函数就可以实现的!

哦，我打电话告诉你！