Советы по Delphi


              

Как узнать доступные сетевые pесуpсы?


Nomadic советует:

Вот пример:

    type
PNetResourceArray = ^TNetResourceArray;
TNetResourceArray = array[0..MaxInt div SizeOf(TNetResource) - 1] of TNetResource;

Procedure EnumResources(LpNR:PNetResource);
Var
NetHandle: THandle;
BufSize: Integer;
Size: Integer;
NetResources: PNetResourceArray;
Count: Integer;
NetResult:Integer;
I: Integer;
NewItem:TListItem;
Begin
If
WNetOpenEnum(
RESOURCE_GLOBALNET,
RESOURCETYPE_ANY,
// RESOURCETYPE_ANY - все ресурсы
// RESOURCETYPE_DISK - диски
// RESOURCETYPE_PRINT - принтеры
0,
LpNR,
NetHandle) <> NO_ERROR
then Exit;
Try
BufSize := 50 * SizeOf(TNetResource);
GetMem(NetResources, BufSize);
Try
while
True do
begin

Count := -1;
Size := BufSize;
NetResult := WNetEnumResource(NetHandle, Count, NetResources, Size);
If NetResult = ERROR_MORE_DATA then
begin

BufSize := Size;
ReallocMem(NetResources, BufSize);
Continue;
end;
if NetResult <> NO_ERROR then Exit;
For I := 0 to Count-1 do
Begin
With
NetResources^[I] do
Begin
If
RESOURCEUSAGE_CONTAINER =
(DwUsage and RESOURCEUSAGE_CONTAINER)
then
EnumResources(@NetResources^[I]);
If dwDisplayType = RESOURCEDISPLAYTYPE_SHARE Then
// ^^^^^^^^^^^^^^^^^^^^^^^^^ - ресурс
// RESOURCEDISPLAYTYPE_SERVER - компьютер
// RESOURCEDISPLAYTYPE_DOMAIN - рабочая группа
// RESOURCEDISPLAYTYPE_GENERIC - сеть
Begin
NewItem:= Form1.ListView1.Items.Add;
NewItem.Caption:=LpRemoteName;
End;
End;
End;
End;
finally
FreeMem(NetResources, BufSize);
end;
finally
WNetCloseEnum(NetHandle);
end;
End;

procedure TForm1.Button1Click(Sender: TObject);
Var
OldCursor: TCursor;
begin
OldCursor:= Screen.Cursor;
Screen.Cursor:= crHourGlass;
With ListView1.Items do
Begin

BeginUpdate;
Clear;
EnumResource(nil);
EndUpdate;
End;
Screen.Cursor:= OldCursor;
end;

Исправления

Михаил Немцов обнаружил и исправил некоторые ошибки. Его код публикуется ниже:

    type
PNetResourceArray = ^TNetResourceArray;
TNetResourceArray = array[0..MaxInt div SizeOf(TNetResource) - 1] of TNetResource;

Procedure EnumResources(LpNR:PNetResource);
Var
NetHandle: DWORD;
BufSize: DWORD;
Size:DWORD;
NetResources: PNetResourceArray;
Count: DWORD;
NetResult:Integer;
I: Integer;
NewItem:TListItem;
Begin
If
WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY,0,LpNR,NetHandle) <> NO_ERROR then Exit; Try BufSize := 50 * SizeOf(TNetResource); GetMem(NetResources, BufSize); Try while True do begin Count := 1; Size := BufSize; NetResult := WNetEnumResource(NetHandle, Count, NetResources, Size); If NetResult = ERROR_MORE_DATA then begin BufSize := Size; ReallocMem(NetResources, BufSize); Continue; end; if NetResult <> NO_ERROR then Exit; For I := 0 to Count-1 do Begin With NetResources^[I] do Begin If RESOURCEUSAGE_CONTAINER =(DwUsage and RESOURCEUSAGE_CONTAINER) then EnumResources(@NetResources^[I]); If dwDisplayType = RESOURCEDISPLAYTYPE_SHARE Then // ^^^^^^^^^^^^^^^^^^^^^^^^^ - ресурс // RESOURCEDISPLAYTYPE_SERVER - компьютер // RESOURCEDISPLAYTYPE_DOMAIN - рабочая группа // RESOURCEDISPLAYTYPE_GENERIC - сеть Begin NewItem:= Form1.ListView1.Items.Add; NewItem.Caption:=LpRemoteName; End; End; End; End; finally FreeMem(NetResources, BufSize); end; finally WNetCloseEnum(NetHandle); end; End;

procedure TForm1.Button1Click(Sender: TObject);
Var
OldCursor: TCursor; begin
OldCursor:= Screen.Cursor; Screen.Cursor:= crHourGlass; With ListView1.Items do Begin BeginUpdate; Clear; EnumResources(nil); EndUpdate; End; Screen.Cursor:= OldCursor; end;

end.

[001120]



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