Delphi静态加载DLL和动态加载DLL示例

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
btnEnableTouch: TButton;
btnDisEnableTouch: TButton;
Label1: TLabel;
Memo1: TMemo;
procedure btnEnableTouchClick(Sender: TObject);
procedure btnDisEnableTouchClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

{ 声明一个回调函数类型 }
type
XTOUCH_ENUM_CALLBACK_PROC = function(pContext:Pointer;szSymbloicName:PChar;nType:Word):Boolean;stdcall;

function EnumerateTouchInstance(hWnd:THandle;pContext:Pointer;pCallback:XTOUCH_ENUM_CALLBACK_PROC):DWORD;stdcall;external 'xtkutility.dll';
//功能：枚举系统中的所有触摸设备

function CreateDevice(szSymbolicName: PChar): THandle;stdcall;external 'xtkutility.dll';
//打开触摸设备
function CloseDevice(hFile: THandle): Boolean;stdcall;external 'xtkutility.dll';
//关闭触摸设备
procedure EnableTouch(hFile: THandle;bEnable: Boolean);stdcall;external 'xtkutility.dll';
//触摸控制 bEnable为true时允许触摸  bEnable为false时禁止触摸

function DisEnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
//声明一个回调函数，禁止触摸所有触摸设备
function EnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
//声明一个回调函数，允许触摸所有触摸设备
var
Form1: TForm1;

implementation

{$R *.dfm}
function DisEnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
var
hDevice: THandle;
begin
hDevice := CreateDevice(szSymbloicName);
EnableTouch(hDevice,False);
CloseDevice(hDevice);
Result := True;
//显示触摸设备标识符
form1.Memo1.Clear;
Form1.Memo1.Lines.Add(szSymbloicName);
end;

function EnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
var
hDevice: THandle;
begin
hDevice := CreateDevice(szSymbloicName);
EnableTouch(hDevice,True);
CloseDevice(hDevice);
Result := True;
//显示触摸设备标识符
form1.Memo1.Clear;
Form1.Memo1.Lines.Add(szSymbloicName);
end;
procedure TForm1.btnEnableTouchClick(Sender: TObject);
var
dwNumsOfDevices: Word;
begin
dwNumsOfDevices := EnumerateTouchInstance(0, nil , EnableTouchscreenCallback);
end;

procedure TForm1.btnDisEnableTouchClick(Sender: TObject);
var
dwNumsOfDevices: Word;
begin
dwNumsOfDevices := EnumerateTouchInstance(0, nil , DisEnableTouchscreenCallback);
end;

end.

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
btnEnableTouch: TButton;
btnDisEnableTouch: TButton;
Label1: TLabel;
Memo1: TMemo;
procedure btnEnableTouchClick(Sender: TObject);
procedure btnDisEnableTouchClick(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

{ 声明一个回调函数类型 }
type
XTOUCH_ENUM_CALLBACK_PROC = function(pContext:Pointer;szSymbloicName:PChar;nType:Word):Boolean;stdcall;

procedure loadDll(dllName: PChar);
function DisEnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
//声明一个回调函数，禁止触摸所有触摸设备
function EnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
//声明一个回调函数，允许触摸所有触摸设备

//动态调用dll
type
TEnumerateTouchInstance = function(hWnd:THandle;pContext:Pointer;pCallback:XTOUCH_ENUM_CALLBACK_PROC):DWORD;stdcall;
TCreateDevice = function(szSymbolicName: PChar): THandle;stdcall;
TCloseDevice = function(hFile: THandle): Boolean;stdcall;
TEnableTouch = procedure(hFile: THandle;bEnable: Boolean);stdcall;

var
Form1: TForm1;
DllHandle: THandle;
EnumerateTouchInstance: TEnumerateTouchInstance;
CreateDevice: TCreateDevice;
CloseDevice: TCloseDevice;
EnableTouch: TEnableTouch;

implementation

{$R *.dfm}

procedure loadDll(DllName: PChar);
begin
try
if FileExists(DllName) then
begin
DllHandle := LoadLibrary(DllName);
if DllHandle = 0 then
begin
raise Exception.Create('加载dll文件：' + DllName + '失败！');
end
else
begin
EnumerateTouchInstance := GetProcAddress(DllHandle,PChar('EnumerateTouchInstance'));
if @EnumerateTouchInstance = nil then
raise Exception.Create('定义函数EnumerateTouchInstance失败！');

CreateDevice := GetProcAddress(DllHandle,PChar('CreateDevice'));
if @CreateDevice = nil then
raise Exception.Create('定义函数CreateDevice失败！');

CloseDevice := GetProcAddress(DllHandle,PChar('CloseDevice'));
if @CloseDevice = nil then
raise Exception.Create('定义函数CloseDevice失败！');

EnableTouch := GetProcAddress(DllHandle,PChar('EnableTouch'));
if @EnableTouch = nil then
raise Exception.Create('定义函数EnableTouch失败！');
end;
end
else
begin
ShowMessage(DllName + '不存在！');
end;
except
on e: Exception do
begin
ShowMessage(e.Message);
end;
end;
end;
function DisEnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
var
hDevice: THandle;
begin
hDevice := CreateDevice(szSymbloicName);
EnableTouch(hDevice,False);
CloseDevice(hDevice);
Result := True;
//显示触摸设备标识符
form1.Memo1.Clear;
Form1.Memo1.Lines.Add(szSymbloicName);
end;

function EnableTouchscreenCallback(pContext:Pointer;szSymbloicName:PChar;nType:Word): Boolean;stdcall;
var
hDevice: THandle;
begin
hDevice := CreateDevice(szSymbloicName);
EnableTouch(hDevice,True);
CloseDevice(hDevice);
Result := True;
//显示触摸设备标识符
form1.Memo1.Clear;
Form1.Memo1.Lines.Add(szSymbloicName);
end;
procedure TForm1.btnEnableTouchClick(Sender: TObject);
var
dwNumsOfDevices: Word;
begin
//使所有触摸设备可以触摸
dwNumsOfDevices := EnumerateTouchInstance(0, nil , EnableTouchscreenCallback);
end;

procedure TForm1.btnDisEnableTouchClick(Sender: TObject);
var
dwNumsOfDevices: Word;
begin
//使所有触摸设备不可触摸
dwNumsOfDevices := EnumerateTouchInstance(0, nil , DisEnableTouchscreenCallback);

end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
FreeLibrary(DllHandle);
end;

procedure TForm1.FormCreate(Sender: TObject);
var
DllName: string;
begin
DllName := ExtractFilePath(ParamStr(0)) + 'xtkutility.dll';
loadDll(PChar(DllName));
end;

end.