delphi - Delphi 2009 及更高版本中的捕获控制台

Question

下面的代码适用于 Delphi XE，但 2400 缓冲区大小相当难看。

有人对清理这个例程有一些建议吗？并使 2400 限制消失(不定义 64000 缓冲区)。

谢谢

procedure TForm1.Button1Click(Sender: TObject);
begin
     CaptureConsoleOutput('c:\windows\system32\ipconfig','',Memo1);
end;<p></p>

<p>procedure TForm1.CaptureConsoleOutput(const ACommand, AParameters: String; AMemo: TMemo);
 const
   CReadBuffer = 2400;
 var
   saSecurity: TSecurityAttributes;
   hRead: THandle;
   hWrite: THandle;
   suiStartup: TStartupInfo;
   piProcess: TProcessInformation;
   pBuffer: array[0..CReadBuffer] of AnsiChar;
   dRead: DWord;
   dRunning: DWord;
 begin
   saSecurity.nLength := SizeOf(TSecurityAttributes);
   saSecurity.bInheritHandle := True;
   saSecurity.lpSecurityDescriptor := nil;</p>

<p>if CreatePipe(hRead, hWrite, @saSecurity, 0) then
   begin
     FillChar(suiStartup, SizeOf(TStartupInfo), #0);
     suiStartup.cb := SizeOf(TStartupInfo);
     suiStartup.hStdInput := hRead;
     suiStartup.hStdOutput := hWrite;
     suiStartup.hStdError := hWrite;
     suiStartup.dwFlags := STARTF_USESTDHANDLES or STARTF_USESHOWWINDOW;
     suiStartup.wShowWindow := SW_HIDE;</p>

<pre><code> if CreateProcess(nil, PChar(ACommand + ' ' + AParameters), @saSecurity,
   @saSecurity, True, NORMAL_PRIORITY_CLASS, nil, nil, suiStartup, piProcess)
   then
 begin
   repeat
     dRunning  := WaitForSingleObject(piProcess.hProcess, 100);
     Application.ProcessMessages();
     repeat
       dRead := 0;
       ReadFile(hRead, pBuffer[0], CReadBuffer, dRead, nil);
       pBuffer[dRead] := #0;

       OemToAnsi(pBuffer, pBuffer);
       AMemo.Lines.Add(String(pBuffer));
     until (dRead < CReadBuffer);
   until (dRunning <> WAIT_TIMEOUT);
   CloseHandle(piProcess.hProcess);
   CloseHandle(piProcess.hThread);
 end;

 CloseHandle(hRead);
 CloseHandle(hWrite);
</code></pre>

<p>end;
end;</p>

<p></p>

Answer 1

我有一些代码可以做到这一点。我已经删除了各种不相关的部分，所以这可能无法按原样编译。但你应该明白:

  procedure ReadStdout(hstdout: THandle; out stdout: string);
  var
    Buffer: AnsiString;
    FileSize: DWORD;
    NumberOfBytesRead: DWORD;
  begin
    FileSize := SetFilePointer(hstdout, 0, nil, FILE_END);
    if FileSize>0 then begin
      SetLength(Buffer, FileSize);
      SetFilePointer(hstdout, 0, nil, FILE_BEGIN);
      ReadFile(hstdout, Buffer[1], FileSize, NumberOfBytesRead, nil);
      //should really check that NumberOfBytesRead=FileSize
      stdout := Buffer;
    end else begin
      stdout := '';
    end;
  end;

  function CreateFileHandle(const FileName: string): THandle;
  var
    SecurityAttributes: TSecurityAttributes;
  begin
    ZeroMemory(@SecurityAttributes, SizeOf(SecurityAttributes));
    SecurityAttributes.nLength := SizeOf(SecurityAttributes);
    SecurityAttributes.lpSecurityDescriptor := nil;
    SecurityAttributes.bInheritHandle := True;
    Result := CreateFile(
      PChar(FileName),
      GENERIC_READ or GENERIC_WRITE,
      FILE_SHARE_READ or FILE_SHARE_WRITE,
      @SecurityAttributes,
      CREATE_ALWAYS,
      FILE_ATTRIBUTE_NORMAL or FILE_FLAG_WRITE_THROUGH,
      0
    );
  end;

  procedure Execute(const ExecutableFileName, DataFileName, TempFolder: string);
  var        
    hstdin, hstdout: THandle;
    StartupInfo: TStartupInfo;
    ProcessInfo: TProcessInformation;
    ExitCode: DWORD;
    stdout: string;
  begin
    hstdin := CreateFileHandle(TempFolder+'stdin');
    hstdout := CreateFileHandle(TempFolder+'stdout');
    Try
      ZeroMemory(@StartupInfo, SizeOf(StartupInfo));
      StartupInfo.cb := SizeOf(StartupInfo);
      StartupInfo.dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
      StartupInfo.wShowWindow := SW_HIDE;
      StartupInfo.hStdInput := hstdin;
      StartupInfo.hStdError := hstdout;
      if CreateProcess(
        PChar(ExecutableFileName),
        '',
        nil,
        nil,
        True,
        CREATE_NO_WINDOW or NORMAL_PRIORITY_CLASS,
        nil,
        PChar(TempFolder),
        StartupInfo,
        ProcessInfo
      ) then begin            
        Try
          WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
          GetExitCodeProcess(ProcessInfo.hProcess, ExitCode);
          ReadStdout(hstdout, stdout);
        Finally
          CloseHandle(ProcessInfo.hProcess);
          CloseHandle(ProcessInfo.hThread);
        End;
      end else begin
        //error;
      end;
    Finally
      CloseHandle(hstdout);
      CloseHandle(hstdin);
    End;
  end;

您有时会想要清理临时文件。