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paramstr();                    

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paramcount()                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,TlHelp32, uallhook, uallProcess;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    ListBox1: TListBox;
    Label1: TLabel;
    Button2: TButton;
    Label2: TLabel;
    Label3: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure WMCOPYDATA(var msg: TWMCopyData); message WM_COPYDATA;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

type
  TMyRecord = packed record
    Para: string[255];
    i: Integer;
  end;
  PMyRecord = ^TMyRecord;

procedure GetProcessList(const aProcessList: TStrings);
var
  Snap: THandle;
  ProcessE: TProcessEntry32;
begin
  aProcessList.Clear;
  Snap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  try
    ProcessE.dwSize := SizeOf(ProcessE);
    if Process32First(Snap, ProcessE) then
      Repeat
        aProcessList.Add(ProcessE.szExeFile);
      until not Process32Next(Snap, ProcessE)
    else
      RaiseLastOSError;
  finally
    CloseHandle(Snap);
  end;
end;

procedure TForm1.WMCOPYDATA(var msg: TWMCopyData);
var
  MyRecord: PMyRecord;
  Para: String[255];
  i:Integer;
begin
  Edit1.Text := PMyRecord(msg.CopyDataStruct.lpData)^.Para;
  Label2.Caption := IntToStr(PMyRecord(msg.CopyDataStruct.lpData)^.i);
  if Edit1.Text = '' then
    Edit1.Text := '-Keine Parameter gefunden!';
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  GetProcessList(ListBox1.Items);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  GetProcessList(ListBox1.Items);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if ListBox1.ItemIndex > 1 then
  begin
    if NOT InjectLibrary(FindProcess(PCHAR(ListBox1.Items.Strings[ListBox1.ItemIndex])), PCHAR(ExtractFIlePath(ParamStr(0))+'DLL.dll')) then
      ShowMessage('Fehler beim Injecten!')
    else
    begin
      Edit1.Clear;
      sleep(100);
      if NOT UnloadLibrary(FindProcess(PCHAR(ListBox1.Items.Strings[ListBox1.ItemIndex])), 'DLL.dll') then
        ShowMessage('Fehler beim Entladen!');
    end;
  end;
end;

end.                    

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library DLL;

uses
  Classes,
  windows,
  messages;

{$R *.res}

 type
  TMyRecord = packed record
    Para: string[255];
    i: Integer;
  end;
  PMyRecord = ^TMyRecord;

function getparams: String;
var
  i:Integer;
begin
  for i:=1 to ParamCount do
  begin
    Result := Result+ParamStr(i);
    if i < ParamCount then
      Result := Result +' ';
  end;
end;

var
  MyRecord: PMyRecord;
  cds: TCopyDataStruct;
  hWnd: THandle;
begin
 GetMem(MyRecord, sizeof(TMyRecord));
  try
    MyRecord.Para := getparams;
    MyRecord.i := ParamCount;
    cds.dwData := 0;
    cds.cbData := sizeof(TMyRecord);
    cds.lpData := MyRecord;
    hWnd := FindWindow(nil, 'Receiver');
    SendMessage(hWnd, WM_COPYDATA, HInstance, Integer(@cds));
  finally
    FreeMem(MyRecord, sizeof(TMyRecord));
  end;
end.