今日接到一个需求：要求我们的一个MFC窗口程序同时兼容命令行模式，也就是用命令行启动并传一个以上参数时，以命令行方式运行，并在命令行上打印运行结果。
visual studio的工程向导创建工程时就对命令行输出进行了规划：如果选择Console程序，工程的编译选项将会出现“/SUBSYSTEM:CONSOLE”，这样工程编译运行之后，stdin，stdout和stderr都指向窗口。但如果选择的是Windows工程，那么编译选项会变成“/SUBSYSTEM:WINDOWS”，就无法向窗口输出了。
解决方法是重定向输出

void EnablePrintfAtMFC()
{
    if (AttachConsole(ATTACH_PARENT_PROCESS))
    {
        FILE* pCout;
        freopen_s(&pCout, "CONOUT$", "w", stdout);
        std::cout.clear();
        std::wcout.clear();
    }
}

这样，只要在输出到窗口前调用上面的EnablePrintfAtMFC();就能将字符串输出到窗口了。
注意两行clear不能省略，我第一次找到这个方法就是因为没clear而造成不能正常显示。

    EnablePrintfAtMFC();
    printf("Hello world!\n");
    std::cout << "It works!" << endl;

但是，在我们的日文命令行下想输出日文还要注意一个转码的问题。
再封装一次就好。

void MyPrint(CString strOutput)
{
    int nSjislen = WideCharToMultiByte(932, 0, strOutput.GetBuffer(0), -1, nullptr, 0, nullptr, nullptr); 
    if (nSjislen >0)
    {
        CStringA strPrintA;
        char* pstr = strPrintA.GetBuffer(nSjislen);
        WideCharToMultiByte(932, 0, strOutput.GetBuffer(0), -1, pstr, nSjislen, nullptr, nullptr);
        printf(pstr);
        strPrintA.ReleaseBuffer();
    }
    strOutput.ReleaseBuffer();
}

中文比日文稍微麻烦一点，有几种码，懒得查了，找到或者用GetConsoleCP()取一下，替换掉932就行。

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