为什么不winmain设置错误级别？ [英] why doesn't winmain set the errorlevel?

问题描述

为什么这个程序正确显示一个消息框，但是没有设置错误级别？

Why does this program correctly display a message box, but does not set the error level?

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
  MessageBox(NULL, _T("This should return 90 no?"), _T("OK"), MB_OK);
  return 90;
}

我将上面的代码编译为名为a.exe的可执行文件。我在命令提示符下：

I compiled the code above to the name an executable called a.exe. The I did this in command prompt:

c:\> a.exe 
 (message box is displayed, I press ok)
c:\> echo %ERRORLEVEL% 
  0

如果我使用 exit（90）; 就在返回之前。它仍然表示 0 。

I get the same results if I use exit(90); right before the return. It still says 0.

我也尝试通过 CreateProcess 启动程序并获取结果 GetExitCodeProcess ，但它也会返回 0 给我。我做错误检查，以确保它都正确启动。

I also tried to start the program via CreateProcess and obtain the result with GetExitCodeProcess but it also returns 0 to me. I did error checking to ensure it was all started correctly.

我最初在一个更复杂的程序中看到这个问题，所以我做了这个简单的程序来验证问题。结果是一样的，两个程序都有 WinMain 总是返回 0 。

I originally saw this problem in a more complex program so I made this simple program to verify the problem. Results are the same, both programs that have WinMain always return 0.

我试过x64，x86和unicode和MBCS编译选项。所有给出 0 作为错误级别/状态代码。

I tried both x64, x86 and unicode and MBCS compiling options. All give 0 as an error level/status code.

推荐答案

如果您的程序是Windows应用程序，而不是控制台应用程序，命令解释程序不会等待它完成（在您按OK之前，查看命令窗口，您将看到它已准备好下一个命令）。

If your program is a Windows app, rather than a Console app, the command interpreter doesn't wait for it to complete (before you press OK, take a look at the command window and you'll see that it's ready for the next command).

如果是这样，应用程序作为控制台子系统应用程序将解决问题。如果你需要作为一个Windows应用程序运行，你可以尝试等待命令完成，看看是否有效（我没有尝试过，但它似乎是一个很好的方法）：

If this is the case, building your application as Console subsystem app would solve the problem. If you need to run as a Windows app, you might try to wait for the command to complete and see if that works (I haven't tried this but it seems like a good approach):

start /wait a.exe
echo %ERRORLEVEL%

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