1 Introduction
2 plug-in frame (unddllmanager)
3 Example of use
3.1 class diagram
3.2 client components
Derived Tclientdll from TDLL;
Add related properties according to the real dynamic library interface;
3.2.1 Component Definition
Unit unclientdll;
Interface
Uses
Windows, classes, sysutils, unddllmanager, unprocdefine;
Type
EclientDLLLEROR = Class (Exception);
{Tclientdll
o inherits from TDLL;
o Automatically get the ClientInitialize address and save it in the ClientInitialize property;
o Automatically get the ClientInsertTrigger address and save it in the ClientInsertTrigger property;
}
Tclientdll = Class (TDLL)
Private
FclientInitialize: TclientInitialize;
FclientInsertTrigger: TclientInsertTrigger;
Fclientgetdescription: Tclientgetdescription;
FclientSetup: TclientSetup;
FDESCRIPTION: STRING;
Fusetrigger: BOOL;
protected
Procedure Dodlloaded; Override;
Procedure Dodllunloaded; Override;
public
CONSTRUCTOR CRETE; OVERRIDE;
Property ClientGetDescription: Tclientgetdescription Read Fclientgetdescription
Property ClientInitialize: TclientInitialize Read FclientInitialize;
Property ClientInsertTrigger: TclientInsertTrigger Read FclientInsertTrigger;
Property ClientSetup: TclientSetup Read FclientSetUp;
Property Description: String Read FDESCRIPTION WRITE FDESCRIPTION;
Property userigger: BOOL Readrigger Write FuseTrigger;
END;
IMPLEMentation
{Tclientdll}
Constructor tclientdll.create;
Begin
inherited;
FclientInitialize: = NIL;
FclientInsertTrigger: = nil;
Fclientgetdescription: = nil;
FclientSetup: = NIL;
END;
Procedure tclientdll.dodllloaded;
Begin
FclientInitialize: = getProcadDress (csclientInitialize);
IF not assigned (fclientInitialize) THEN
Raise EclientdllerRor.create ('No Found of Proc "ClientInitialize";);
FclientInsertTrigger: = getProcadDress (csclientInsertTrigger); if not assigned (fclientInserttrigger)
Raise Eclientdller.create ('No Found of Proc "ClientInsertTrigger";);
// Optional interface, even if there is no existence.
Fclientgetdescription: = getProcaddress (csclientgetdescription);
FclientSetup: = getProcadDress (CSClientSetup);
inherited;
END;
Procedure Tclientdll.dodllunloaded;
Begin
inherited;
FclientInitialize: = NIL;
FclientInsertTrigger: = nil;
Fclientgetdescription: = nil;
FclientSetup: = NIL;
END;
End.
3.2.2 Use of components
Procedure TXXXSERVER.LOADCLIENTDLL (Const filename: string);
// Features: Load a clientdll and pass the relevant data into
VAR
Index: Integer;
Description: String;
Usetrigger: bool;
Aclientdll: Tclientdll;
Begin
INDEX: = fclientdlls.add (filename);
IF Index <0 THEN
Raise ExxxError.createfmt ('clientdll "% s" is already loaded.', [filename]);
/ / Try to read the address
Try
Fclientdlls [index] .loaded: = true;
Finally
IF not fclientdlls [index] .loaded then
Fclientdlls [index] .free;
END;
// Initialize the Client while incoming related information
Usetrigger: = false;
Aclientdll: = Tclientdll (fclientdlls [index]);
IF assigned (aclientdll.clientsetup) THEN
Aclientdll.ClientSetup (MscappPath 'Client /', False);
END;
3.3 server components
3.3.1 Component Definition
Unit unserverdll;
Interface
Uses
Windows, classes, sysutils, unddllmanager, unprocdefine;
Type
Eserverdller = Class (Exception);
{TSERVERDLL
o inherits from TDLL;
o Automatically get QueryInterface address and save it in the queryinterface property;
}
TSERVERDLL = Class (TDLL)
Private
Ffunctions: TOBJECT;
FQUERYINTERFACE: TPROCQUERYINTERFACE;
protected
Procedure Dodlloaded; Override;
Procedure Dodllunloaded; Override;
public
Procedure refreshallfunctionsPermit; Property functions: TOBJECT Read ffunctions Write FFunctions
Property Queryinterface: TPROCQUERYINTERFACE: TPROCQUERYINTERFACE r
END;
IMPLEMENTATION
Uses
UNTFunctionProc;
{TSERVERDLL}
Procedure TSerVerdll.dodllloaded;
Begin
FQueryInterface: = getProcaddress (csqueryinterface);
IF not assigned (FQueryinterface) THEN
Raise eserverdller.create ('no found of "queryinterface" proc.');
Inherited; // This sentence needs to be placed behind
END;
Procedure tServerdll.dodllunloaded;
Begin
inherited;
FQUERYINTERFACE: = NIL;
END;
Procedure TServerdll.refreshallfunctionsPermit;
VAR
I: integer;
Begin
ASSERT (FFunctions <> NIL);
For i: = 0 to tfunctionList (ffunctions) .count - 1 do
IF TFunction (TFunctionList (ffunctions) [i]). DLL = SELF THEN
TFunction (TFunctionList (ffunctions) [i]). Permit: = permit;
END;
End.
3.3.2 Component
slightly.
Culture
