unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
function Show(ss:string):PChar;stdcall;external '.\ShowTitle.DLL';var
Form1: TForm1;
implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var str:string;
begin
str:=Show('as'); //显示TOO MANY ACTUAL PARAMETERS
// showmessage( str );
end;end.动态链接库如下:
library ShowTitle;{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }uses
SysUtils,
Classes;{$R *.res}
function Show(ss:string):PChar;stdcall;
begin
Result:=PChar(ss);
end;exports Show;begin
end.编译调用程序时,就显示TOO MANY ACTUAL PARAMETERS
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
function Show(ss:string):PChar;stdcall;external '.\ShowTitle.DLL';var
Form1: TForm1;
implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var str:string;
begin
str:=Show('as'); //显示TOO MANY ACTUAL PARAMETERS
// showmessage( str );
end;end.动态链接库如下:
library ShowTitle;{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }uses
SysUtils,
Classes;{$R *.res}
function Show(ss:string):PChar;stdcall;
begin
Result:=PChar(ss);
end;exports Show;begin
end.编译调用程序时,就显示TOO MANY ACTUAL PARAMETERS
function _Show(ss:string):PChar;stdcall;
begin
Result:=PChar(ss);
end;exports _Show;begin
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