不知道怎样编写一个类似于ping的程序(150分)

不知道怎样编写一个功能类似于ping的程序？是不是一定要按照ping函数的协议栈从头
做呢？

Delphi6有个ICMP控件。
有个例子叫PingGUI。

如果你问如何能得到网络邻居的列表，那是一个非常复杂的任务


您将不得不和非常不友好的OLE对象打交道

下面两个过程可能会对你有用

procedure GetDomainList(TV:TTreeView);
var
a : Integer;
ErrCode : Integer;
NetRes : Array[0..1023] of TNetResource;
EnumHandle : THandle;
EnumEntries : DWord;

BufferSize : DWord;
s : string;
itm : TTreeNode;
begin
{ Start here }
try
With NetRes[0] do begin
dwScope :=RESOURCE_GLOBALNET;
dwType :=RESOURCETYPE_ANY;
dwDisplayType :=RESOURCEDISPLAYTYPE_DOMAIN;
dwUsage :=RESOURCEUSAGE_CONTAINER;
lpLocalName :=NIL;
lpRemoteName :=NIL;
lpComment :=NIL;
lpProvider :=NIL;
end;
{ get net root }
ErrCode:=WNetOpenEnum(
RESOURCE_GLOBALNET,
RESOURCETYPE_ANY,
RESOURCEUSAGE_CONTAINER,
@NetRes[0],

EnumHandle
);
If ErrCode=NO_ERROR then begin
EnumEntries:=1;
BufferSize:=SizeOf(NetRes);
ErrCode:=WNetEnumResource(
EnumHandle,
EnumEntries,
@NetRes[0],
BufferSize
);
WNetCloseEnum(EnumHandle);
ErrCode:=WNetOpenEnum(
RESOURCE_GLOBALNET,
RESOURCETYPE_ANY,
RESOURCEUSAGE_CONTAINER,
@NetRes[0],
EnumHandle
);
EnumEntries:=1024;
BufferSize:=SizeOf(NetRes);
ErrCode:=WNetEnumResource(
EnumHandle,
EnumEntries,
@NetRes[0],
BufferSize
);
IF ErrCode=No_Error then with TV do try
a:=0;
Items.BeginUpDate;
Items.Clear;

Itm:=Items.Add(TV.Selected,string(NetRes[0].lpProvider));
Itm.ImageIndex:=0;
Itm.SelectedIndex:=0;

{ get domains }
While a How can I get the contents of the Neighborhood?

The following unit defines a component, TNetworkBrowser, which can be used
to enumerate all resources on the network in a hierarchical tree. The
actual browsing takes a long time (try opening "Entire Network" in Windows
Explorer). If you set the Scope property to nsContext, you'll see the list

of machines from the "Network Neighborhood" window.
下面的一个单元定义了一个组件. TNetworkBrowser, 可以枚举hierachical树上所有
的网络资源. 实际上浏览是要花费很长时间的,这您可以通过在WINDOWS资源管理器
中打开"整个网络" 来比较一下. 如果你设置SCOPE属性 为nsContext , 你就可以看到
和网络邻居中一样的机器列表

Yorai Aminov
El-On Software Systems

unit NetBrwsr;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
TNetScope = (nsConnected, nsGlobal, nsRemembered, nsContext);

TNetResourceType = (nrAny, nrDisk, nrPrint);
TNetDisplay = (ndDomain, ndGeneric, ndServer, ndShare, ndFile, ndGroup,
ndNetwork, ndRoot, ndShareAdmin, ndDirectory, ndTree, ndNDSContainer);
TNetUsage = set of (nuConnectable, nuContainer);

TNetworkItems = class;

TNetworkItem = class
private
FScope: TNetScope;
FResourceType: TNetResourceType;
FDisplay: TNetDisplay;
FUsage: TNetUsage;
FLocalName: string;
FRemoteName: string;
FComment: string;
FProvider: string;
FSubItems: TNetworkItems;
public
constructor Create;
destructor Destroy; override;
property Scope: TNetScope read FScope;

property ResourceType: TNetResourceType read FResourceType;
property Display: TNetDisplay read FDisplay;
property Usage: TNetUsage read FUsage;
property LocalName: string read FLocalName;
property RemoteName: string read FRemoteName;
property Comment: string read FComment;
property Provider: string read FProvider;
property SubItems: TNetworkItems read FSubItems;
end;

TNetworkItems = class
private
FList: TList;
procedure SetItem(Index: Integer; Value: TNetworkItem);
function GetItem(Index: Integer): TNetworkItem;

function GetCount: Integer;
public
constructor Create;
destructor Destroy; override;
procedure Clear;
procedure Add(Item: TNetworkItem);
procedure Delete(Index: Integer);
property Items[Index: Integer]: TNetworkItem read GetItem write
SetItem; default;
property Count: Integer read GetCount;
end;

TNetworkBrowser = class(TComponent)
private
FItems: TNetworkItems;
FScope: TNetScope;
FResourceType: TNetResourceType;
FUsage: TNetUsage;
FActive: Boolean;
procedure Refresh;
procedure SetActive(Value: Boolean);
procedure SetScope(Value: TNetScope);

procedure SetResourceType(Value: TNetResourceType);
procedure SetUsage(Value: TNetUsage);
procedure EnumerateNet(NetItems: TNetworkItems; lpnr: PNetResource);
protected
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Open;
procedure Close;
property Items: TNetworkItems read FItems;
published
property Scope: TNetScope read FScope write SetScope default nsGlobal;
property ResourceType: TNetResourceType read FResourceType
write SetResourceType default nrAny;
property Usage: TNetUsage read FUsage write SetUsage default [];

property Active: Boolean read FActive write SetActive default False;
end;

implementation

type
PNetResourceArray = ^TNetResourceArray;
TNetResourceArray = array[0..0] of TNetResource;

{ TNetworkItem }

constructor TNetworkItem.Create;
begin
inherited;
FSubItems := TNetworkItems.Create;
end;

destructor TNetworkItem.Destroy;
begin
if FSubItems <> nil then
FSubItems.Free;
inherited;
end;

{ TNetworkItems }

constructor TNetworkItems.Create;
begin
inherited;
FList := TList.Create;
end;

destructor TNetworkItems.Destroy;

begin
Clear;
if FList <> nil then
FList.Free;
inherited;
end;

procedure TNetworkItems.SetItem(Index: Integer; Value: TNetworkItem);
begin
if (FList.Items[Index] <> nil) and (FList.Items[Index] <> Value) then
TNetworkItem(FList.Items[Index]).Free;
FList.Items[Index] := Value;
end;

function TNetworkItems.GetItem(Index: Integer): TNetworkItem;
begin
Result := TNetworkItem(FList.Items[Index]);
end;

procedure TNetworkItems.Clear;
begin
while Count > 0 do
Delete(0);
end;

procedure TNetworkItems.Add(Item: TNetworkItem);
begin

FList.Add(Item);
end;

procedure TNetworkItems.Delete(Index: Integer);
begin
if FList.Items[Index] <> nil then
TNetworkItem(FList.Items[Index]).Free;
FList.Delete(Index);
end;

function TNetworkItems.GetCount: Integer;
begin
if FList <> nil then
Result := FList.Count
else
Result := 0;
end;

{ TNetworkBrowser }

constructor TNetworkBrowser.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FItems := TNetworkItems.Create;
FScope := nsGlobal;
FResourceType := nrAny;
FUsage := [];
end;

destructor TNetworkBrowser.Destroy;
begin
if FItems <> nil then
FItems.Free;

inherited;
end;

procedure TNetworkBrowser.EnumerateNet(NetItems: TNetworkItems; lpnr:
PNetResource);
var
dwResult, dwResultEnum: Integer;
hEnum: THandle;
cbBuffer, cEntries, i: Integer;
nrArray: PNetResourceArray;
NewItem: TNetworkItem;
dwScope, dwType, dwUsage: Integer;
begin
cbBuffer := 16384;
cEntries := $FFFFFFFF;

case FScope of
nsConnected: dwScope := RESOURCE_CONNECTED;
nsGlobal: dwScope := RESOURCE_GLOBALNET;
nsRemembered: dwScope := RESOURCE_REMEMBERED;

nsContext: dwScope := RESOURCE_CONTEXT;
else
dwScope := RESOURCE_GLOBALNET;
end;
case FResourceType of
nrAny: dwType := RESOURCETYPE_ANY;
nrDisk: dwType := RESOURCETYPE_DISK;
nrPrint: dwType := RESOURCETYPE_PRINT;
else
dwType := RESOURCETYPE_ANY;
end;
dwUsage := 0;
if nuConnectable in FUsage then
dwUsage := dwUsage or RESOURCEUSAGE_CONNECTABLE;
if nuContainer in FUsage then
dwUsage := dwUsage or RESOURCEUSAGE_CONTAINER;

dwResult := WNetOpenEnum(dwScope, dwType, dwUsage, lpnr, hEnum);

if dwResult <> NO_ERROR then Exit;

GetMem(nrArray, cbBuffer);
repeat
dwResultEnum := WNetEnumResource(hEnum, cEntries, nrArray, cbBuffer);
if dwResultEnum = NO_ERROR then
for i := 0 to cEntries-1 do
begin
NewItem := TNetworkItem.Create;
case nrArray.dwScope of
RESOURCE_CONNECTED: NewItem.FScope := nsConnected;
RESOURCE_GLOBALNET: NewItem.FScope := nsGlobal;
RESOURCE_REMEMBERED: NewItem.FScope := nsRemembered;
RESOURCE_CONTEXT: NewItem.FScope := nsContext;

else
NewItem.FScope := nsGlobal;
end;
case nrArray.dwType of
RESOURCETYPE_ANY: NewItem.FResourceType := nrAny;
RESOURCETYPE_DISK: NewItem.FResourceType := nrDisk;
RESOURCETYPE_PRINT: NewItem.FResourceType := nrPrint;
else
NewItem.FResourceType := nrAny;
end;
case nrArray.dwDisplayType of
RESOURCEDISPLAYTYPE_GENERIC: NewItem.FDisplay := ndGeneric;
RESOURCEDISPLAYTYPE_DOMAIN: NewItem.FDisplay := ndDomain;

RESOURCEDISPLAYTYPE_SERVER: NewItem.FDisplay := ndServer;
RESOURCEDISPLAYTYPE_SHARE: NewItem.FDisplay := ndShare;
RESOURCEDISPLAYTYPE_FILE: NewItem.FDisplay := ndFile;
RESOURCEDISPLAYTYPE_GROUP: NewItem.FDisplay := ndGroup;
RESOURCEDISPLAYTYPE_NETWORK: NewItem.FDisplay := ndNetwork;
RESOURCEDISPLAYTYPE_ROOT: NewItem.FDisplay := ndRoot;
RESOURCEDISPLAYTYPE_SHAREADMIN: NewItem.FDisplay :=

ndShareAdmin;
RESOURCEDISPLAYTYPE_DIRECTORY: NewItem.FDisplay :=
ndDirectory;
RESOURCEDISPLAYTYPE_TREE: NewItem.FDisplay := ndTree;
RESOURCEDISPLAYTYPE_NDSCONTAINER: NewItem.FDisplay :=
ndNDSContainer;
else
NewItem.FDisplay := ndGeneric;
end;
NewItem.FUsage := [];
if nrArray.dwUsage and RESOURCEUSAGE_CONNECTABLE <> 0 then
Include(NewItem.FUsage, nuConnectable);
if nrArray.dwUsage and RESOURCEUSAGE_CONTAINER <> 0 then

Include(NewItem.FUsage, nuContainer);
NewItem.FLocalName := StrPas(nrArray.lpLocalName);
NewItem.FRemoteName := StrPas(nrArray.lpRemoteName);
NewItem.FComment := StrPas(nrArray.lpComment);
NewItem.FProvider := StrPas(nrArray.lpProvider);
NetItems.Add(NewItem);
// if container, call recursively
if (nuContainer in NewItem.FUsage) and (FScope <> nsContext) then
EnumerateNet(NewItem.FSubItems, @nrArray)

end;
until dwResultEnum = ERROR_NO_MORE_ITEMS;

FreeMem(nrArray);
WNetCloseEnum(hEnum);
end;

procedure TNetworkBrowser.Refresh;
begin
FItems.Clear;
if FActive then
EnumerateNet(FItems, nil);
end;

procedure TNetworkBrowser.SetActive(Value: Boolean);
begin
if Value <> FActive then
begin
FActive := Value;
Refresh;
end;
end;

procedure TNetworkBrowser.SetScope(Value: TNetScope);
begin
if Value <> FScope then
begin
FScope := Value;
Refresh;
end;
end;


procedure TNetworkBrowser.SetResourceType(Value: TNetResourceType);
begin
if Value <> FResourceType then
begin
FResourceType := Value;
Refresh;
end;
end;

procedure TNetworkBrowser.SetUsage(Value: TNetUsage);
begin
if Value <> FUsage then
begin
FUsage := Value;
Refresh;
end;
end;

procedure TNetworkBrowser.Open;
begin
Active := True;
end;

procedure TNetworkBrowser.Close;
begin
Active := False;
end;

另外,给你发了一个实现PING的小程序
望查收

我的MM呀。这么长的代码。我宁可自己敲‘ping ***.***.***.*** -t’

>>

我知道，告诉我你的email，我把原程序给你发过去。

谢谢大家的帮助，我的邮箱是houzhe@cattsoft.com

如果只是为了判断网络是否连通，不用这样的。

多人接受答案了。

ICMP ->
ICMP.ping
handle onreplay