delphi - 执行后台程序并继续执行代码？

Question

我想从我的 Delphi 代码运行后台应用程序。打开的应用程序是一个基于 DOS 的 EXE，它将内容输出到 DOS 窗口。该程序将无限期地打开，直到从任务管理器关闭为止。我当前用来打开应用程序的代码是；

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

    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;

        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);
                    if(dRead > 0) then
                    begin
                      pBuffer[dRead] := #0;
                      //ShowMessage(pBuffer);
                      //OemToAnsi(pBuffer, pBuffer);
                      //Unicode support by Lars Fosdal
                      OemToCharA(pBuffer, dBuffer);
                      CallBack(dBuffer);
                    end;
                until (dRead < CReadBuffer);
            until (dRunning <> WAIT_TIMEOUT);
            CloseHandle(piProcess.hProcess);
            CloseHandle(piProcess.hThread);
        end;
        CloseHandle(hRead);
        CloseHandle(hWrite);
    end;
end;

这很好，但是因为程序不会“退出”并永远保持打开状态，所以我的应用程序挂起，并且代码永远不会移动。

如有任何帮助，我们将不胜感激

Answer 1

如果您不需要对生成的进程执行任何操作，只需关闭 CreateProcess() 返回的句柄并继续，该进程将继续运行。但由于您似乎需要连续读取生成进程的输出，因此您可以简单地将逻辑移至工作线程中，这样您的主代码就不会再被阻塞。