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The Client for an Internet Access Control Application


Recently we finished a series covering the server side for an Internet access control application; now we're ready to take on the client. The client application is what the Internet users will see shortly before a workstation is activated or when a session is completed. It is responsible for both time and user access management as you will see in the rest of the series. Crucially, it is also responsible for processing all communication between itself and the server.

Author Info:
By: David Web
Rating: 5 stars5 stars5 stars5 stars5 stars / 6
September 29, 2008
TABLE OF CONTENTS:
  1. · The Client for an Internet Access Control Application
  2. · Small and Main Window
  3. · Disable Mouse and Keyboard Access
  4. · Retrieving the Workstation Name

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The Client for an Internet Access Control Application - Disable Mouse and Keyboard Access
(Page 3 of 4 )

The next function is responsible for disabling mouse and keyboard access:


//screenblock function

function TForm1.FuncAvail(dllName, funcName: string; var p: pointer): boolean;

var

lib: THandle;

begin

result := false;

p := nil;

if LoadLibrary(PChar(dllName)) = 0 then exit;

lib := GetModuleHandle(PChar(dllName)) ;

if lib <> 0 then

begin

p := GetProcAddress(lib, PChar(funcName)) ;

if p <> nil then Result := true;

end;

end;

//***********end screenblock function

The parse functions should be familiar to you by now. They are responsible for breaking up text that is sent by the server to the client, as demonstrated above. The code for the function is listed below:


//*******string functions

function ParseString(s : string; var Token1,Token2,Token3: string) :

boolean;

var

P1,P2 : integer;

begin

P1 := Pos(':',s);

P2 := Pos('@',s);

//Test if both delimiters are present, in the right order and

//at least 1 char apart

if ((P1 > 0) and (P2 > 0) and (P2 > P1) and (Abs(P2-P1) > 1))

then begin

Token1 := Copy(s,1,P1-1);

Token2 := Copy(s,P1+1,P2-P1-1);

Token3 := Copy(s,P2+1,Length(s)-P2);

Result := True; //valid string

end

else Result := False; //invalid string

end;

//*****end string


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