issuing Netsh command from Delphi program - delphi

Question

I am trying to capture the Device ID of an AirCard. I am using the following code with the intentions of storing the results in a text file (imei.txt) that I store in the Temp folder and loop through the contents, looking for DEVICE ID.
The problems is that it only writes "The following command was not found: mbn show interface." to the file.
I have tested the Netsh command from the command line and it returns what I would expect.
xs1 := CreateOleObject('WSCript.Shell');
xs1.run('%comspec% /c netsh mbn show interface > "' + IMEIFileName +
'"', 0, true);
It is failing to process the NetSh command properly. Am I passing it through the Comspec correctly? It seems to not run the "NetSh" command and acts as if I am running "mbn" from the command prompt.
Thanks
unit uMain;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, System.Win.ComObj, ShlObj, Vcl.StdCtrls;
type
TfrmMain = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
procedure GetAirCardInformation;
{ Private declarations }
public
{ Public declarations }
IMEI: string;
PhoneNumber: string;
end;
var
frmMain: TfrmMain;
implementation
{$R *.dfm}
procedure TfrmMain.Button1Click(Sender: TObject);
begin
GetAirCardInformation;
end;
procedure TfrmMain.GetAirCardInformation;
var
xs1 : OleVariant;
IMEIFileName: String;
IMEIStrings: TStringList;
I: Integer;
function GetSpecialFolder(const CSIDL: Integer): string;
var
RecPath: PWideChar;
begin
RecPath := StrAlloc(MAX_PATH);
try
FillChar(RecPath^, MAX_PATH, 0);
if SHGetSpecialFolderPath(0, RecPath, CSIDL, false) then
result := RecPath
else
result := '';
finally
StrDispose(RecPath);
end;
end;
begin
IMEI := '';
IMEIFileName := GetSpecialFolder(CSIDL_LOCAL_APPDATA) + '\Temp\imei.txt';
Memo1.Lines.Add('IMEIFileName: ' + IMEIFileName);
try
if FileExists(IMEIFileName) then
DeleteFile(IMEIFileName);
xs1 := CreateOleObject('WSCript.Shell');
xs1.run('%comspec% /c netsh mbn show interface > "' + IMEIFileName +
'"', 0, true);
if FileExists(IMEIFileName) then
begin
IMEIStrings := TStringList.Create;
IMEIStrings.LoadFromFile(IMEIFileName);
IMEIStrings.NameValueSeparator := ':';
Memo1.Lines.Add('IMEIStrings Count: ' + intToStr(IMEIStrings.Count));
for I := 0 to IMEIStrings.Count - 1 do
begin
Memo1.Lines.Add(IMEIStrings.text);
if (Uppercase(Trim(IMEIStrings.Names[I])) = 'DEVICE ID') then
begin
IMEI := Trim(IMEIStrings.Values[IMEIStrings.Names[I]]);
Memo1.Lines.Add('IMEI:' + IMEI);
break;
end;
end;
end;
except
IMEI := '';
end;
Memo1.Lines.Add('process complete');
end;
end.

Answer 1

You should not be using the WShell COM object to run cmd.exe. That is overkill. You can use CreateProcess() instead. However, when running cmd.exe programmably, you cannot redirect its output using the > operator, that only works in an actual command window. You can instead use the STARTUPINFO structure to redirect the output to an anonymous pipe created with CreatePipe(), and then you can read from that pipe using ReadFile(). No need to use a temp file at all. MSDN has an article on this topic:
Creating a Child Process with Redirected Input and Output
There are plenty of examples floating around that demonstrate this technique in Delphi.
That being said, a better option is to not use netsh at all. Windows 7 and later have a Mobile Broadband API. You can enumerate the MBN interfaces directly in your code.
For example, using the WwanEnumerateInterfaces() function:
unit WwApi;
{$MINENUMSIZE 4}
interface
uses
Windows;
const
WWAN_STR_DESC_LENGTH = 256;
type
WWAN_INTERFACE_STATE = (
WwanInterfaceStateNotReady,
WwanInterfaceStateDeviceLocked,
WwanInterfaceStateUserAccountNotActivated,
WwanInterfaceStateRegistered,
WwanInterfaceStateRegistering,
WwanInterfaceStateDeregistered,
WwanInterfaceStateAttached,
WwanInterfaceStateAttaching,
WwanInterfaceStateDetaching,
WwanInterfaceStateActivated,
WwanInterfaceStateActivating,
WwanInterfaceStateDeactivating
);
WWAN_INTF_OPCODE = (
WwanIntfOpcodePin,
WwanIntfOpcodeRadioState,
WwanIntfOpcodePreferredProviders,
WwanIntfOpcodeCurrentConnection,
WwanIntfOpcodeProvisionedContexts,
WwanIntfOpcodeActivateUserAccount,
WwanIntfOpcodeVendorSpecific,
WwanIntfOpcodeInterfaceObject,
WwanIntfOpcodeConnectionObject,
WwanIntfOpcodeAcState,
WwanIntfOpcodeClearManualConnectState,
WwanIntfOpcodeGetStoredRadioState,
WwanIntfOpcodeGetRadioInfo,
WwanIntfOpcodeHomeProvider
);
// I don't know the definition of this type!
WWAN_STATUS = DWORD; //?
WWAN_INTERFACE_STATUS = record
fInitialized: BOOL;
InterfaceState: WWAN_INTERFACE_STATE;
end;
PWWAN_INTERFACE_INFO = ^WWAN_INTERFACE_INFO;
WWAN_INTERFACE_INFO = record
InterfaceGuid: TGuid;
strInterfaceDescription: array[0..WWAN_STR_DESC_LENGTH-1] of WCHAR;
InterfaceStatus: WWAN_INTERFACE_STATUS;
ParentInterfaceGuid: TGuid;
fIsAdditionalPdpContextInterface: BOOL;
end;
PWWAN_INTERFACE_INFO_LIST = ^WWAN_INTERFACE_INFO_LIST;
WWAN_INTERFACE_INFO_LIST = record
dwNumberOfItems: DWORD;
pInterfaceInfo: array[0..0] of WWAN_INTERFACE_INFO;
end;
function WwanOpenHandle(dwClientVersion: DWORD; pReserved: Pointer; var pdwNegotiatedVersion: DWORD; var phClientHandle: THandle): DWORD; stdcall;
function WwanCloseHandle(hClientHandle: THandle; pReserved: Pointer): DWORD; stdcall;
function WwanEnumerateInterfaces(hClientHandle: THandle; pdwReserved: PDWORD; var ppInterfaceList: PWWAN_INTERFACE_INFO_LIST): DWORD; stdcall;
procedure WwanFreeMemory(pMem: Pointer); stdcall;
function WwanQueryInterface(hClientHandle: THandle; const pInterfaceGuid: TGuid; opCode: WWAN_INTF_OPCODE; pReserved: Pointer; var pdwDataSize: DWORD; var ppData: PByte; var pRequestId: ULONG; var pStatus: WWAN_STATUS): DWORD; stdcall;
implementation
const
WwApiLib = 'WwApi.dll';
function WwanOpenHandle; external WwApiLib delayed;
function WwanCloseHandle; external WwApiLib delayed;
function WwanEnumerateInterfaces; external WwApiLib delayed;
procedure WwanFreeMemory; external WwApiLib delayed;
function WwanQueryInterface; external WwApiLib delayed;
end.
unit uMain;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs,
Vcl.StdCtrls;
type
TfrmMain = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
procedure GetAirCardInformation;
{ Private declarations }
public
{ Public declarations }
IMEI: string;
PhoneNumber: string;
end;
var
frmMain: TfrmMain;
implementation
{$R *.dfm}
uses
WwApi;
procedure TfrmMain.Button1Click(Sender: TObject);
begin
GetAirCardInformation;
end;
procedure TfrmMain.GetAirCardInformation;
var
dwNegotiatedVersion: DWORD;
hClientHandle: THandle;
pInterfaceList: PWWAN_INTERFACE_INFO_LIST;
pInterface: PWWAN_INTERFACE_INFO;
I: DWORD;
begin
IMEI := '';
Memo1.Clear;
try
// The value of the first parameter is undocumented!
// WlanOpenHandle() has a similar parameter, where 1
// is for XP and 2 is for Vista+. Maybe it is the same
// for WwanOpenHandle()?...
//
if WwanOpenHandle(2, nil, dwNegotiatedVersion, hClientHandle) = 0 then
try
if WwanEnumerateInterfaces(hClientHandle, nil, pInterfaceList) = 0 then
try
Memo1.Lines.Add('IMEIStrings Count: ' + IntToStr(pInterfaceList.dwNumberOfItems));
if pInterfaceList.dwNumberOfItems > 0 then
begin
pInterface := #pInterfaceList.pInterfaceInfo[0];
for I := 0 to pInterfaceList.dwNumberOfItems-1 do
begin
// use pInterface as needed...
Memo1.Lines.Add('Desc:' + StrPas(pInterface.strInterfaceDescription));
Memo1.Lines.Add('Intf:' + GUIDToString(pInterface.InterfaceGuid));
// and so on ...
Memo1.Lines.Add('');
Inc(pInterface);
end;
end;
finally
WwanFreeMemory(pInterfaceList);
end;
finally
WwanCloseHandle(hClientHandle, nil);
end;
except
end;
Memo1.Lines.Add('process complete');
end;
end.
Alternatively, using the IMbnInterfaceManager and IMbnInterface COM interfaces, which give you more detailed information:
unit uMain;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs,
Vcl.StdCtrls;
type
TfrmMain = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
procedure GetAirCardInformation;
{ Private declarations }
public
{ Public declarations }
IMEI: string;
PhoneNumber: string;
end;
var
frmMain: TfrmMain;
implementation
{$R *.dfm}
uses
// I found the MbnApi.pas unit on the DelphiPraxis forum:
//
// http://www.delphipraxis.net/1342330-post2.html
//
// It is too large to post here on StackOverflow!
// Otherwise, you can import the mbnapi.tlb TypeLibrary yourself...
//
MbnApi, ActiveX, ComObj;
procedure TfrmMain.Button1Click(Sender: TObject);
begin
GetAirCardInformation;
end;
procedure TfrmMain.GetAirCardInformation;
var
Mgr: IMbnInterfaceManager;
pInterfaceArray, pPhoneNumberArray: PSafeArray;
pInterface: IMbnInterface;
subscriber: IMbnSubscriberInformation;
ReadyState: MBN_READY_STATE;
lIntfLower, lIntfUpper: LONG;
lPhoneNumLower, lPhoneNumUpper: LONG;
I, J: LONG;
wStr: WideString;
begin
Memo1.Clear;
try
OleCheck(CoCreateInstance(CLASS_MbnInterfaceManager, nil, CLSCTX_ALL, IMbnInterfaceManager, Mgr));
OleCheck(Mgr.GetInterfaces(pInterfaceArray));
try
OleCheck(SafeArrayGetLBound(pInterfaceArray, 1, lIntfLower));
OleCheck(SafeArrayGetUBound(pInterfaceArray, 1, lIntfUpper));
for I = lIntfLower to lIntfUpper do
begin
OleCheck(SafeArrayGetElement(pInterfaceArray, I, pInterface));
try
// use pInterface as needed...
OleCheck(pInterface.get_InterfaceID(wStr));
try
Memo1.Lines.Add('Interface ID:' + wStr);
finally
wStr := '';
end;
OleCheck(pInterface.GetReadyState(ReadyState));
Memo1.Lines.Add('Ready State:' + IntToStr(Ord(ReadyState)));
OleCheck(pInterface.GetSubscriberInformation(subscriber));
try
OleCheck(subscriber.Get_SubscriberID(wStr));
try
Memo1.Lines.Add('Subscriber ID: ' + wStr);
finally
wStr := '';
end;
OleCheck(subscriber.Get_SimIccID(wStr));
try
Memo1.Lines.Add('Sim ICC ID: ' + wStr);
finally
wStr := '';
end;
OleCheck(subscriber.Get_TelephoneNumbers(pPhoneNumberArray));
try
OleCheck(SafeArrayGetLBound(pPhoneNumberArray, 1, lPhoneNumLower));
OleCheck(SafeArrayGetUBound(pPhoneNumberArray, 1, lPhoneNumUpper));
for J = lPhoneNumLower to lPhoneNumUpper do
begin
OleCheck(SafeArrayGetElement(pPhoneNumberArray, J, wStr));
try
Memo1.Lines.Add('Phone #:' + wStr);
finally
wStr := '';
end;
end;
finally
SafeArrayDestroy(pPhoneNumberArray);
end;
finally
subscriber := nil;
end;
// and so on...
Memo1.Lines.Add('');
finally
pInterface := nil;
end;
end;
finally
SafeArrayDestroy(pInterfaceArray);
end;
except
end;
Memo1.Lines.Add('process complete');
end;
end.