Question

 var fpath="C:\TVT_"+cur_date+"_"+cur_time+".avi";

 Components.utils.import("resource://gre/modules/FileUtils.jsm");

 var env = Components.classes["@mozilla.org/process/environment;1"]
                .getService(Components.interfaces.nsIEnvironment);
 var shell = new FileUtils.File(env.get("COMSPEC"));

 var args = ["/c", "cd.. & cd.. & C: & cd C:/ffmpeg/bin & record.bat "+fpath];

 var process = Components.classes["@mozilla.org/process/util;1"]
                 .createInstance(Components.interfaces.nsIProcess);
 process.init(shell);
 process.runAsync(args, args.length);

I don t want to use taskkill.exe, /MIN, /C, /B, rather I want to quit this ffmpeg process
I read about CMDOW but did not find cmdow.exe inside system32 directory.
So how can I send quit command within the same window which is running ffmpeg process?

Using Windows XP 服务包 2, 配有 Firefox 12

谢谢

Answer 1

并非微不足道的 ─ Firefox 没有任何内在功能, 这意味着您需要使用 < a href=" https:// developmenter.mozilla.org/ en/js- ctyms/" rel=" nofollow noreferr" >js- ctypes , 并直接拨打 Win32 API 函数。 < a href=" https://stackoverflow.com/ questions/6202547/win32- get-main- wnd- handle-of-aplict > > > win32 - 获取应用程序的主 Wind Handle 描述您在发送 < codead> WMUIT < /codead mess > 之后如何获得顶级窗口的应用程序。

Components.utils.import("resource://gre/modules/ctypes.jsm");

var userlib = ctypes.open("user32");

var HWND = ctypes.voidptr_t;
var UINT = ctypes.uint32_t;
var WPARAM = ctypes.uint16_t;
var LPARAM = ctypes.uint32_t;
var LRESULT = ctypes.uint32_t;
var DWORD = ctypes.uint32_t;
var WNDENUMPROC = ctypes.FunctionType(ctypes.stdcall_abi,
                                      ctypes.bool,
                                      [HWND, LPARAM]).ptr;
var WM_CLOSE = 0x0010;

var EnumWindows = userlib.declare(
  "EnumWindows", ctypes.winapi_abi,
  ctypes.bool,
  WNDENUMPROC, LPARAM
);

var GetWindowThreadProcessId = userlib.declare(
  "GetWindowThreadProcessId", ctypes.winapi_abi,
  DWORD,
  HWND, DWORD.ptr
);

var IsWindowVisible = userlib.declare(
  "IsWindowVisible", ctypes.winapi_abi,
  ctypes.bool,
  HWND
);

var SendMessage = userlib.declare(
  "SendMessageW", ctypes.winapi_abi,
  LRESULT,
  HWND, UINT, WPARAM, LPARAM
);

var callback = WNDENUMPROC(function(hWnd, lParam)
{
  var procId = DWORD();
  GetWindowThreadProcessId(hWnd, procId.address());
  if (procId.value == pid && IsWindowVisible(hWnd))
    SendMessage(hWnd, WM_CLOSE, 0, 0);
  return true;
});
EnumWindows(callback, 0);

userlib.close();

我测试了这一点, 并能够成功关闭一个 Notespad 窗口( 如果文本没有保存, 通常的警告将会出现, 这样它就是一个干净的关机 ) 。在您的情况中, 问题可能在于您没有直接运行 ffmpeg, 而是通过命令行 shell 来运行。这样您就可以关闭命令行窗口, 它可能不会终止 ffmpeg 。我猜您必须尝试一下, 如果它不起作用, 您可能不得不查看窗口的标题而不是其进程 ID ( 这显然不太可靠 ) 。

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