Proger10
11.11.2009, 16:27
Решил в своей программе добавить возможность подключения плагинов. Плагины решил делать dll-ками. Но множество плагинов должны будут добавлять на форму компоненты. Попытался написать в dll:
library DllPlug;
{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }
uses
Forms,
StdCtrls;
{$R *.res}
procedure Exec(Form: TForm);
var
l: TLabel;
begin
l:=TLabel.Create(Form);
l.Parent:=Form;
l.Caption:='I''m adding Label from dll!';
end;
exports
Exec;
begin
end.
, в основном приложении:
unit Unit1;
interface
uses
Windows, Forms, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
Exec : procedure (Form: TForm);
Handle : Thandle;
begin
handle := LoadLibrary('dllplug.dll');
if handle <> 0 then
begin
@Exec := GetProcAddress(handle,'Exec');
Exec(Form1);
end;
FreeLibrary(handle);
end;
end.
В итоге когда жму на кнопку - Cannnot assign TFont to a TFont. Почему и как исправить??
library DllPlug;
{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }
uses
Forms,
StdCtrls;
{$R *.res}
procedure Exec(Form: TForm);
var
l: TLabel;
begin
l:=TLabel.Create(Form);
l.Parent:=Form;
l.Caption:='I''m adding Label from dll!';
end;
exports
Exec;
begin
end.
, в основном приложении:
unit Unit1;
interface
uses
Windows, Forms, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
Exec : procedure (Form: TForm);
Handle : Thandle;
begin
handle := LoadLibrary('dllplug.dll');
if handle <> 0 then
begin
@Exec := GetProcAddress(handle,'Exec');
Exec(Form1);
end;
FreeLibrary(handle);
end;
end.
В итоге когда жму на кнопку - Cannnot assign TFont to a TFont. Почему и как исправить??