打開撥號連接
調用撥號網絡裡的撥號程序來連接：其中'連接Internet'為你創建的撥號程序名稱
winexec('rundll32.exe rnaui.dll,RnaDial '+'連接Internet',9);
一個串口通訊的問題? >
Serial Port Communications?
問
I want to build a simple electrical controller which receives input from a
sensor through a comm port and either turns a power source(s) on or off
based upon this signal. I want this controller to be software in nature.
How do I communicate through the port and is it possible to discern changes
in voltage.
If not, what kind of signal must be input.
答
When you want to write and read only binary signals you can use the printer
parallel port. For that purpose the Port command is useful. In the below an
example of some D1 code used for bidirectional 2 wire bus communication (I2C).
BaseAddress is $278, $378 or $3BC, depending on the LPT port used for
communication.
There is a 'but'. In D1 the port function was available but not documented. In
D2 and D3 it seems to have disappeared entirely (Please somebody correct me if
this is wrong).
We are using the parallel printer port with attached a small interface card
with some I/O buffering for control of RF modules. Could somebody indicate
whether the Port function still exist or what the alternative could be ?
regards,
Hans Brekelmans
PROCEDURE SetIICline(Terminal: IICterminalTypes; High: Boolean);
Var Count : Word;
CtrlAddress: Word;
Begin { set iic line }
CtrlAddress:=BaseAddress+2;
Case Terminal of
SCL : if High then Port[CtrlAddress]:=$08 else Port[CtrlAddress]:=$00;
SDA : if NOT High then Port[BaseAddress]:=$80 else Port[BaseAddress]:=$00;
END;
For Count := 1 to ClockDelay do;
End; {SetIICline}
FUNCTION GetIICline(Terminal: IICterminalTypes): Boolean;
const SDA_IN=$80; { SDA: 25 pin #11, status, NOT BUSY, bit 7 }
SCL_IN=$08; { SCL: 25 pin #15, status, NOT Error, bit 3 }
var Count : Word;
ReadAddress: Word;
Begin
ReadAddress:=BaseAddress+1;
CASE Terminal OF
SCL: GetIICline:=((Port[ReadAddress] AND SCL_IN) = SCL_IN);
SDA: GetIICline:=((Port[ReadAddress] AND SDA_IN) = SDA_IN); { read sda
pin }
END;
For Count := 1 to ClockDelay do;
End;
得到本機IP地址?
How about using winsockets?
This code is untested and ugly.
program get_ip;
uses
winsock,sysutils;
VAR
ch : ARRAY[1..32] OF Char;
i : Integer;
WSData: TWSAData;
MyHost: PHostEnt;
begin
IF WSAstartup(2,wsdata)<>0 THEN
BEGIN
Writeln('can't start Winsock: Error ',WSAGetLastError);
Halt(2);
END;
try
IF getHostName(@ch[1],32)<>0 THEN
BEGIN
Writeln('getHostName failed');
Halt(3);
END;
except
Writeln('getHostName failed');
halt(3);
end;
MyHost:=GetHostByName(@ch[1]);
IF MyHost=NIL THEN
BEGIN
Writeln(GetHostName('+StrPas(@ch[1])+') failed : Error
'+IntToStr(WSAGetLastError));
Halt(4);
END
ELSE
BEGIN
Write('address ');
FOR i:=1 TO 4 DO
BEGIN
Write(Ord(MyHost.h_addr^[i-1]));
IF i<4 THEN
write('.')
ELSE
writeln;
END;
END;
end.
任何動態改變/添加網絡設置中的 TCP/IP 的 DNS 地址
例如，把 DNS Server的地址添加為192.0.0.1和192.1.1.0，可調用：
SetTCPIPDNSAddresses('192.0.0.1 192.1.1.0') ;
// 各地址之間用一個空格隔開
1. SetTCPIPDNSAddresses 定義如下：
procedure SetTCPIPDNSAddresses( sIPs : string );
begin
//
// if using Windows NT
//
SaveStringToRegistry_LOCAL_MacHINE(
'SYSTEMCurrentControlSet' +
'ServicesTcpipParameters',
'NameServer',
sIPs );
//
// if using Windows 95
//
SaveStringToRegistry_LOCAL_MacHINE(
'SYSTEMCurrentControlSet' +
'ServicesVxDMSTCP',
'NameServer',
sIPs );
end;
2. 其中 SaveStringToRegistry_LOCAL_MacHINE 定義：
uses Registry;
procedure SaveStringToRegistry_LOCAL_MacHINE(
sKey, sItem, sVal : string );
var
reg : TRegIniFile;
begin
reg := TRegIniFile.Create( ' );
reg.RootKey := HKEY_LOCAL_MacHINE;
reg.WriteString( sKey, sItem, sVal + #0 );
reg.Free;
end;
如何在程序中動態取得Win95/98的網絡鄰居中的工作組及計算機名?
可參考下面代碼，或許有所幫助：
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 }
下面的一個單元定義了一個組件. TNetworkBrowser, 可以枚舉hIErachical樹上所有
的網絡資源. 實際上浏覽是要花費很長時間的,這您可以通過在Windows資源管理器
中打開"整個網絡" 來比較一下. 如果你設置SCOPE屬性 為nsContext , 你就可以看到
和網絡鄰居中一樣的機器列表.
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[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;
