试试这个 library Project1;{ 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, ExtCtrls; procedure movepic(a:timage;var b:boolean;c:string) stdcall; begin if b=true then begin a.Picture.LoadFromFile(c); b:=false; end; end;{$R *.res}begin end.
library Project1;{ Important note about DLL memory management: ShareMem must be the first unit in your library's USES clause AND your project's (select Project-View Source) USES clause if your DLL exports any procedures or functions that pass strings as parameters or function results. This applies to all strings passed to and from your DLL--even those that are nested in records and classes. ShareMem is the interface unit to the BORLNDMM.DLL shared memory manager, which must be deployed along with your DLL. To avoid using BORLNDMM.DLL, pass string information using PChar or ShortString parameters. }uses SysUtils, Classes, ExtCtrls; procedure movepic(a:timage;var b:boolean;c:string) stdcall;export; begin if b=true then begin a.Picture.LoadFromFile(c); b:=false; end; end; exports movepic;{$R *.res}begin end.
library Project1;{ 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,
ExtCtrls;
procedure movepic(a:timage;var b:boolean;c:string) stdcall;
begin
if b=true then
begin
a.Picture.LoadFromFile(c);
b:=false;
end;
end;{$R *.res}begin
end.
implementationuses Unit2; //procedure movepic(a:timage;var b:boolean;c:string);stdcall;external'picdll.dll';{$R *.dfm}procedure TForm1.BitBtn2Click(Sender: TObject);
//var
//b:boolean;
//c:string;
begin
//b:=true;
// c:=extractfilepath(application.ExeName)+'\images\del2.bmp';
//movepic(image1,b,c);end;end.
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,
ExtCtrls;
procedure movepic(a:timage;var b:boolean;c:string) stdcall;export;
begin
if b=true then
begin
a.Picture.LoadFromFile(c);
b:=false;
end;
end;
exports
movepic;{$R *.res}begin
end.
为什么DLL里不用 RegisterClasses(Timage)就可以用类TimageZSWang快快讲讲课呀