Delphi 匿名管道

代码如下：

function CallCmd(CommandStr: string): string;
const
  ReadBuffer = 4096;
var
  Security: TSecurityAttributes;
  si: TStartUpInfo;
  pi: PROCESS_INFORMATION;
  hRead,hWrite: THandle;
  len: DWORD;
  ExitCode: DWORD;
  Buffer: PAnsiChar;
  hProcess: Integer;
begin
  with Security do
  begin
    nlength := SizeOf(TSecurityAttributes);
    binherithandle := true;
    lpsecuritydescriptor := nil;
  end;
  if not Createpipe(hRead,hWrite,@Security,0) then
  begin
    ShowMessage(‘Pipe Create Error 0x01‘);
  end;
  //GetStartupInfo(si);
  FillChar(si,Sizeof(si),#0);
  with si do
  begin
    cb := SizeOf(si);
    dwFlags := STARTF_USESTDHANDLES or STARTF_USESHOWWINDOW;
    wShowWindow := SW_HIDE;
    hStdOutput := hWrite;
    hStdError := hWrite;
  end;
  if not CreateProcess(nil,PWideChar(‘cmd.exe /c ‘ + CommandStr),0,TRUE,si,pi) then
  begin
    ShowMessage(‘Create Process Error‘);
  end;

  CloseHandle(hWrite);
  Buffer := AllocMem(ReadBuffer + 1);
  while True do
  begin
    PeekNamedPipe(hRead,0,@len,0);
    if len <> 0 then
    begin
      ReadFile(hRead,Buffer[0],ReadBuffer,dword(len),nil);
      {out date}
      with Form1.mmo1 do
      begin
        Lines.Text := Lines.Text + Buffer;
        SelStart := Length(Lines.Text);
        SelLength := 0;
      end;
    end
    else
    begin
      //Break;
      GetExitCodeProcess(pi.hProcess,ExitCode);
      if ExitCode <> STILL_ACTIVE then
      begin
        CloseHandle(hRead);
        Break;
      end;
    end;
  end;
end;