DELPHI中动态调用dll
显式例子:unit Main;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, Grids, DBGrids, DB, DBTables, DBCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
Edit2: TEdit;
Image1: TImage;
DataSource1: TDataSource;
Table1: TTable;
Table1SpeciesNo: TFloatField;
Table1Category: TStringField;
Table1Common_Name: TStringField;
Table1SpeciesName: TStringField;
Table1Lengthcm: TFloatField;
Table1Length_In: TFloatField;
Table1Notes: TMemoField;
Table1Graphic: TGraphicField;
DBGrid1: TDBGrid;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
//function GetInteger(I:Integer): Integer;stdcall;external 'DLLOne.dll';
//function GetDouble(F:Double): Double;stdcall;external 'DLLOne.dll';
TGetDouble = function (F:Double): Double; stdcall;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var D: Double;
DLLHandle: THandle;
Func: TGetDouble;
begin
Image1.Picture.Assign(Table1Graphic);
Table1Graphic.Assign(Image1.Picture);
Exit;
DLLHandle := LoadLibrary('DLLOne.dll');
try
@Func := GetProcAddress(DLLHandle, 'GetDouble');
//Edit1.Text := IntToStr(GetInteger(2));
//D := GetDouble(2.2);
if Assigned(@Func) then
begin
D := Func(2.2);
Edit2.Text := FloatToStr(D);
end;
finally
FreeLibrary(DLLHandle);
end;
end;
end.
隐式例子:
library DLLOne;
uses
SysUtils,
Classes;
{$R *.res}
function GetDoubleExt(F:Double): Double;stdcall;external 'DLLTwo.dll';
function GetInt(I:Integer): Integer;stdcall;external 'DLLTwo.dll';
function GetInteger(I:Integer): Integer;stdcall;
begin
Result := GetInt(I);
end;
function GetDouble(D:Double): Double;stdcall;
begin
Result := GetDoubleExt(D);
end;
exports
GetInteger,
GetDouble;
begin
end.
library DLLTwo;
{ 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 GetDoubleExt(D:Double):Double ;stdcall;
begin
Result := D;
end;
function GetInt(I:Integer): Integer;stdcall;
begin
Result := I;
end;
exports
GetDoubleExt,
GetInt;
begin
end. 感谢楼主的分享！
页:
[1]