获取MySQL进程输出

时间:2015-12-05 18:25:00

标签: mysql process cmd freepascal

我想使用MySQL进程并获取它写入控制台的内容,因此我在FreePascal中编写此代码:

我想控制MySQl并阅读&写点什么。

    Process := TProcess.Create(nil);
      with Process do
      begin
        Executable := 'C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin\mysql.exe';
        with Parameters do
        begin
          Options := [poUsePipes];
          Add('-u');
          Add('root');
          Add('-p');
        end;
        Execute;
    sleep(1000);
    WriteLn(Process.Output.NumBytesAvailable); // will be 0 but it write "Enter password"
  WriteLn(Process.Stderr.NumBytesAvailable);    // will be 0 but it write "Enter password"  
      end;  

TProcess是一个控制执行其他程序的组件,我甚至测试Delphi代码,但结果都是一样的。

但问题是这会冻结因为没有输出而是控制台窗口写:

  

输入密码:

如何在我的应用程序和其他所有应用程序中获取此信息?

正如我所说,我想使用MySQL可执行文件并从中读取和写入,所以我不想使用它的库或任何其他数据库组件。

修改 这是来自here的我的测试的Delphi版本,结果相同:

function GetDosOutput(CommandLine: string; Work: string = 'C:\'): string;
var
  SA: TSecurityAttributes;
  SI: TStartupInfo;
  PI: TProcessInformation;
  StdOutPipeRead, StdOutPipeWrite: THandle;
  WasOK: Boolean;
  Buffer: array[0..255] of AnsiChar;
  BytesRead: Cardinal;
  WorkDir: string;
  Handle: Boolean;
begin
  Result := '';
  with SA do begin
    nLength := SizeOf(SA);
    bInheritHandle := True;
    lpSecurityDescriptor := nil;
  end;
  CreatePipe(StdOutPipeRead, StdOutPipeWrite, @SA, 0);
  try
    with SI do
    begin
      FillChar(SI, SizeOf(SI), 0);
      cb := SizeOf(SI);
      dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
      wShowWindow := SW_HIDE;
      hStdInput := GetStdHandle(STD_INPUT_HANDLE); // don't redirect stdin
      hStdOutput := StdOutPipeWrite;
      hStdError := StdOutPipeWrite;
    end;
    WorkDir := Work;
    Handle := CreateProcess(nil, PChar('cmd.exe /C ' + CommandLine),
                            nil, nil, True, 0, nil,
                            PChar(WorkDir), SI, PI);
    CloseHandle(StdOutPipeWrite);
    if Handle then
      try
        repeat
          WasOK := ReadFile(StdOutPipeRead, Buffer, 255, BytesRead, nil);
          if BytesRead > 0 then
          begin
            Buffer[BytesRead] := #0;
            Result := Result + Buffer;
          end;
        until not WasOK or (BytesRead = 0);
        WaitForSingleObject(PI.hProcess, INFINITE);
      finally
        CloseHandle(PI.hThread);
        CloseHandle(PI.hProcess);
      end;
  finally
    CloseHandle(StdOutPipeRead);
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
memo1.text:=GetDosOutput('"C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin\mysql.exe" -u root -p');
end;

它会在 WasOK 行中冻结。 此外,我测试了许多其他代码,但没有工作。

0 个答案:

没有答案