网络和通讯编程_Delphi程序_学习笔记★闵涛★计算机学习电脑编程软硬件技巧


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网络和通讯编程

作者：闵涛文章来源：闵涛的学习笔记点击数：1720 更新时间：2009/4/23 18:42:41

estructor 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[i].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[i].dwType of
RESOURCETYPE_ANY: NewItem.FResourceType := nrAny;
RESOURCETYPE_DISK: NewItem.FResourceType := nrDisk;
RESOURCETYPE_PRINT: NewItem.FResourceType := nrPrint;
else
NewItem.FResourceType := nrAny;
end;
case nrArray[i].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[i].dwUsage and RESOURCEUSAGE_CONNECTABLE <> 0 then
Include(NewItem.FUsage, nuConnectable);
if nrArray[i].dwUsage and RESOURCEUSAGE_CONTAINER <> 0 then
Include(NewItem.FUsage, nuContainer);
NewItem.FLocalName := StrPas(nrArray[i].lpLocalName);
NewItem.FRemoteName := StrPas(nrArray[i].lpRemoteName);
NewItem.FComment := StrPas(nrArray[i].lpComment);
NewItem.FProvider := StrPas(nrArray[i].lpProvider);
NetItems.Add(NewItem);
// if container, call recursively
if (nuContainer in NewItem.FUsage) and (FScope <> nsContext) then
EnumerateNet(NewItem.FSubItems, @nrArray[i])
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;
end.

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