private { Private declarations } public { Public declarations } end; function RemoveFolder(FolderName:PChar;bDeleteReadOnly:boolean;bDeleteFolder:boolean):boolean;stdcall;external 'FileIO.dll'; var Form1: TForm1;implementation
请你在看一下DLL前面的注释 { 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. }ShareMem 这个单元很重要
你声明dll时也可能出错
func.... "yourdll.dll" stacall
如果没有指明默认是register调用
先getmem为FolderName变量赋值
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 RemoveFolder(FolderName:PChar;bDeleteReadOnly:boolean;bDeleteFolder:boolean):boolean;stdcall;external 'FileIO.dll';
var
Form1: TForm1;implementation
{ 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. }ShareMem 这个单元很重要