1、利用注册表啊
第一次运行程序时，在注册表里创建初始信息。以后每次运行程序时，在程序中从注册表里读，并判断使用时间，超过时间就Application.Terminate就行了
2、unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Registry, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
var
registerTemp : TRegistry;
curDate : TDateTime;
begin
registerTemp := TRegistry.Create;
with registerTemp do
begin
RootKey := HKEY_LOCAL_MACHINE;
//判断是否初次运行程序
if OpenKey('SoftwareMySoftware',True) then
begin
if ReadBool('Runned') then
//不是第一次运行
begin
curDate := Date;
if (curDate-ReadTime('LastRunTime'))>=ReadInteger('Duration') then
begin
//当前的系统时间超出了使用期限
ShowMessage('试用版已到期');
exit;
end
else
begin
DeleteKey('LastRunTime');
WriteTime('LastRunTime',Date);
end;
end
else
begin
//初次运行程序
DeleteKey('Runned');
WriteBool('Runned',True);
//设置试用期限30天
WriteInteger('Duration',30);
//写入当前运行时间
WriteTime('LastRunTime',Date);
end;
end
else
begin
ShowMessage('Fails!');
end;
CloseKey;
end;
end;
end.
3、uses
Registry;
const
CKeyName = 'EncryptReg';
function TMainForm.InstallRegInfo: Boolean;
var
Reg: TRegistry;
G: TGuid;
sGuid: string;
begin
Result := False;
Reg := TRegistry.Create;
try
with Reg do
begin
RootKey := HKEY_CLASSES_ROOT;
if KeyExists(CKeyName) then
begin // 检测是否已经存在键名了
Result := False;
Exit;
end
else
begin
if not CreateKey(CKeyName) then
begin // 创建主键名——相当于文件夹
Result := False;
Exit;
end
else
begin
if not OpenKey(CKeyName, False) then
begin // 创建保存使用次数的键名
Result := False;
Exit;
end
else
begin // 创建GUID并写入键值
CreateGuid(G);
sGuid := GuidToString(G); // 注意：sGuid中包括'{}'符号
sGuid[8] := '0';
sGuid[9] := '0'; // 从左到右，第8和9位作为计数器，将他们置零
WriteString(GuidToString(G), sGuid);
Result := True;
end;
end;
end;
end;
finally
FreeAndNil(Reg);
end;
end;
procedure TMainForm.UninstallRegInfo;
var
Reg: TRegistry;
begin
Reg := TRegistry.Create;
try
with Reg do
begin
RootKey := HKEY_CLASSES_ROOT;
if not DeleteKey(CKeyName) then
raise Exception.Create('Can''t delete registry info');
end;
finally
FreeAndNil(Reg);
end;
end;
procedure TMainForm.IncreaseUsedTime;
var
Reg: TRegistry;
sTime: string;
iTime: Integer;
sKeyName: string;
KeyNameList: TStringList;
begin
Reg := TRegistry.Create;
KeyNameList := TStringList.Create;
try
with Reg do
begin
RootKey := HKEY_CLASSES_ROOT;
if not KeyExists(CKeyName) then
raise Exception.Create('Missing registry info, program can''t run!')
else
begin
if not OpenKey(CKeyName, False) then
raise Exception.Create('Can''t read registry info, program can''t run!')
else
begin
GetValueNames(KeyNameList); // 读取GUID键名，因为GUID是随机生成的。
if KeyNameList.Count <= 0 then
raise Exception.Create('Not found regsitry key!')
else
begin
sKeyName := KeyNameList.Strings[0]; // 因为只有一个键，所有读取索引为0的字符串就是我们想要的那个键值。
sTime := ReadString(sKeyName);
if Length(Trim(sTime)) <> 38 then
raise Exception.Create('Registry value error!')
else
begin
iTime := HexToInt(sTime[8])*16 + HexToInt(sTime[9]);
if iTime > 30 then
raise Exception.Create('Thirty times is used. Please register!')
else
begin
Inc(iTime);
sTime[8] := IntToHex(iTime div 16);
sTime[9] := IntToHex(iTime mod 16);
WriteString(sKeyName, sTime);
end;
end;
end;
CloseKey;
end;
end;
end;
finally
FreeAndNil(KeyNameList);
FreeAndNil(Reg);
end;
end;
function TMainForm.HexToInt(const cHex: Char): Byte;
begin
case cHex of
'0'..'9': Result := StrToInt(cHex);
'a', 'A': Result := 10;
'b', 'B': Result := 11;
'c', 'C': Result := 12;
'd', 'D': Result := 13;
'e', 'E': Result := 14;
'f', 'F': Result := 15;
else
Result := 0;
end;
end;
function TMainForm.IntToHex(const iInt: Integer): Char;
begin
case iInt of
0: Result := '0';
1: Result := '1';
2: Result := '2';
3: Result := '3';
4: Result := '4';
5: Result := '5';
6: Result := '6';
7: Result := '7';
8: Result := '8';
9: Result := '9';
10: Result := 'A';
11: Result := 'B';
12: Result := 'C';
13: Result := 'D';
14: Result := 'E';
15: Result := 'F';
else
Result := ' ';
end;
end;