将嵌入式Python IO重定向到使用AllocConsole创建的控制台 [英] Redirect Embedded Python IO to a console created with AllocConsole

问题描述

我有一些麻烦让Python IO重定向到我为我的Win32应用程序分配的控制台。是否有一个特定于Python的流，我需要重定向？

这里是更多或更少，我现在做的错误检查删除等： / p>

  int __stdcall WinMain（/ *这里常用的东西* /）{
 //创建控制台
 AllocConsole （）; 
 SetConsoleTitle（L我的控制台）; 
 
 //重定向标准IO流到新控制台
 freopen（CONOUT $，w，stdout）; 
 freopen（CONOUT $，w，stderr）; 
 freopen（CONIN $，r，stdin）; 
 
 //测试控制台：
 printf（This Works.\r\\\
）; 
 cout<< 所以这个< endl; 
 
 // Python Stuff（这是失败的地方）
 Py_Initialize（）; 
 PyRun_SimpleString（print（'I do not work。'）\\\
）; 
 Py_Finalize（）;如果我运行相同的东西，但作为一个控制台应用程序（Visual Studio 05，
} 
  

< BTW）并删除AllocConsole调用一切正常。任何人都知道我错过了什么？

编辑：为了澄清，我正在寻找一种方法来从C API。

YET ANOTHER编辑：Alex的解决方案是正确的，但对于使用Python 3.x的任何人，你可能会注意到，在新的API中缺少PyFile_FromString函数。虽然它可能不是最好的替代品，我发现这在Python 3.x中很好：

  PyObject * sys = PyImport_ImportModule （sys）; 
 PyObject * io = PyImport_ImportModule（io）; 
 PyObject * pystdout = PyObject_CallMethod（io，open，ss，CONOUT $，wt）; 
 if（-1 == PyObject_SetAttrString（sys，stdout，pystdout））{
 / *向全世界公布你的错误* / 
} 
 Py_DECREF 
 Py_DECREF（io）; 
 Py_DECREF（pystdout）; 
  

解决方案

设置 sys.stdout 在Python端（可能是 open（'CONOUT $'，'wt'） / code>工作，类似 sys.stderr 和 sys.stdin 。 （有更快的方法使这个发生从C扩展，但最简单的方法是只是执行Python语句，一个 import sys 在前面 - ）。 / p>

原因：因为Python的运行时，在启动时发现标准FD关闭，因此设置 sys.stdout 并且不会再检查和设置它们不同 - 所以你只是自己设置它们，明确地，它会很好。

如果你渴望做它所有在C-API级别，它将需要几行，但是当然可以做...

  PyObject * sys = PyImport_ImportModule（sys）; 
 PyObject * pystdout = PyFile_FromString（CONOUT $，wt）; 
 if（-1 == PyObject_SetAttrString（sys，stdout，pystdout））{
 / *引发错误和非常响亮* / 
} 
 Py_DECREF 
 Py_DECREF（pystdout）; 
  

这完全等同于单个Python行：

  sys.stdout = open（'CONOUT $'，'wt'）
  

$ b b

I am having some trouble getting Python IO redirected to a console that I've allocated for my Win32 app. Is there a Python-specific stream that I need to redirect?

Here's more-or-less what I'm doing now (error checking removed, etc.):

int __stdcall WinMain(/*Usual stuff here*/) {
    // Create the console
    AllocConsole();
    SetConsoleTitle(L"My Console");

    // Redirect Standard IO Streams to the new console
    freopen("CONOUT$","w",stdout);
    freopen("CONOUT$","w",stderr);
    freopen("CONIN$","r",stdin);

    // Test the console:
    printf("This Works.\r\n");
    cout << "So Does this" << endl;

    // Python Stuff (This is where it fails)
    Py_Initialize();
    PyRun_SimpleString("print('I don't work.')\n");
    Py_Finalize();
}

If I run the same thing but as a console app (Visual Studio 05, BTW) and remove the AllocConsole call everything works. Anyone know what I'm missing?

EDIT: Just for clarification, I am looking for a way to do it from the C API.

YET ANOTHER EDIT: Alex's solution is correct, but for anyone out there using Python 3.x you'll probably notice that the PyFile_FromString function is missing in the new API. While it may not be the best alternative, I found that this works fine in Python 3.x:

PyObject* sys = PyImport_ImportModule("sys");
PyObject* io = PyImport_ImportModule("io");
PyObject* pystdout = PyObject_CallMethod(io, "open", "ss", "CONOUT$", "wt");
if (-1 == PyObject_SetAttrString(sys, "stdout", pystdout)) {
    /* Announce your error to the world */
}
Py_DECREF(sys);
Py_DECREF(io);
Py_DECREF(pystdout);

解决方案

Set sys.stdout on the Python side (presumably to an open('CONOUT$', 'wt')) to make Python's print work, and similarly for sys.stderr and sys.stdin. (There are faster ways to make this happen from a C extension, but the simplest way is to just execute the Python statements, with a import sys in front;-).

Why: because Python's runtime, on startup, found the standard FDs closed, set sys.stdout and friends accordingly, and is not going to check again and set them differently -- so you just set them yourself, explicitly, and it will be fine.

If you're keen to do it all at C-API level, it will take a few lines, but of course it can be done...

PyObject* sys = PyImport_ImportModule("sys");
PyObject* pystdout = PyFile_FromString("CONOUT$", "wt");
if (-1 == PyObject_SetAttrString(sys, "stdout", pystdout)) {
  /* raise errors and wail very loud */
}
Py_DECREF(sys);
Py_DECREF(pystdout);

this is the exact equivalent of the single Python line:

sys.stdout = open('CONOUT$', 'wt')

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