从Windows 10上的Win32 GUI应用程序输出到控制台

Question

我尝试将此代码输出到控制台:

#include <Windows.h>

#include <stdio.h>
#include <io.h>
#include <fcntl.h>

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    AllocConsole();

    HANDLE handle_out = GetStdHandle(STD_OUTPUT_HANDLE);
    int hCrt = _open_osfhandle((long) handle_out, _O_TEXT);
    FILE* hf_out = _fdopen(hCrt, "w");
    setvbuf(hf_out, NULL, _IONBF, 1);
    *stdout = *hf_out;

    HANDLE handle_in = GetStdHandle(STD_INPUT_HANDLE);
    hCrt = _open_osfhandle((long) handle_in, _O_TEXT);
    FILE* hf_in = _fdopen(hCrt, "r");
    setvbuf(hf_in, NULL, _IONBF, 128);
    *stdin = *hf_in;

    printf("Hello!");
}

控制台打开但没有输出任何内容.这段代码出了什么问题？

我尝试了所有这些建议:

https://justcheckingonall.wordpress.com/2008/08/29/console-window-win32-app/

http://dslweb.nwnexus.com/~ast/dload/guicon.htm

如何在Win32应用程序中打印到调试输出窗口？

但我无法获得任何输出到WinMain中Windows 10上使用AllocConsole()创建的控制台.注意:我实际上没有创建任何真正的Window.在Window 10中有什么改变阻止上述解决方案工作或者是否存在我可能缺少的东西(编译器标志或其他东西)？

你怎么看？

Answer 1

试试这个代码.

AllocConsole();
HANDLE stdHandle;
int hConsole;
FILE* fp;
stdHandle = GetStdHandle(STD_OUTPUT_HANDLE);
hConsole = _open_osfhandle( (long)stdHandle, _O_TEXT);
fp = _fdopen(hConsole, "w");

freopen_s( &fp, "CONOUT$", "w", stdout);

printf("Hello console on\n");
std::cout << "Windows 10" << std::endl;

Answer 2

基于ProXicT链接接受的答案，并进行了一些修改。以下代码适用于std :: cout。其他方法不适用于Visual Studio 2015的64位：

#include <iostream>
#include <cstdio>
#include <fstream>

#include <Windows.h>


// For debugging
#include <io.h>
#include <fcntl.h>


#define UNUSED(x) (void)(x)       // Unused param (C compatible - not applicable to expressions)

class outbuf : public std::streambuf {
public:
    outbuf() {
        setp(0, 0);
    }

    virtual int_type overflow(int_type c = traits_type::eof()) {
        return fputc(c, stdout) == EOF ? traits_type::eof() : c;
    }
};

int CALLBACK
WinMain (HINSTANCE hInstance,
         HINSTANCE /*hPrevInst*/, // Unused param (C++ only)
         LPSTR lpCmdLine,
         int (nShowCmd))
{
    UNUSED(hInstance);
//    UNUSED(hPrevInst);
    UNUSED(lpCmdLine);
    UNUSED(nShowCmd); // This param is used


    // create the console
    if (AllocConsole()) {
        FILE* pCout;
        freopen_s(&pCout, "CONOUT$", "w", stdout);
        SetConsoleTitle(L"Debug Console");
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_RED);
    }

    // set std::cout to use my custom streambuf
    outbuf ob;
    std::streambuf *sb = std::cout.rdbuf(&ob);

    // do some work here
    printf("Hello!\n");

    std::cout << "nShowCmd = " << nShowCmd << std::endl;
    std::cout << "Now making my first Windows window!" << std::endl;


    // make sure to restore the original so we don't get a crash on close!
    std::cout.rdbuf(sb);

    MessageBoxW (NULL,
                 L"Hello World!",
                 L"hello",
                 MB_OK | MB_ICONINFORMATION);

    return 0;
}

编辑：

与上述相同，但有完整的颜色：

#include <iostream>
#include <cstdio>
#include <fstream>

#include <Windows.h>


// For debugging
#include <io.h>
#include <fcntl.h>


#define UNUSED(x) (void)(x)       // Unused param (C compatible - not applicable to expressions)

class outbuf : public std::streambuf {
public:
    outbuf() {
        setp(0, 0);
    }

    virtual int_type overflow(int_type c = traits_type::eof()) {
        return fputc(c, stdout) == EOF ? traits_type::eof() : c;
    }
};

int CALLBACK
WinMain (HINSTANCE hInstance,
         HINSTANCE /*hPrevInst*/, // Unused param (C++ only)
         LPSTR lpCmdLine,
         int (nShowCmd))
{
    UNUSED(hInstance);
//    UNUSED(hPrevInst);
    UNUSED(lpCmdLine);
    UNUSED(nShowCmd); // This param is used


    // create the console
    if (AllocConsole()) {
        FILE* pCout;
        freopen_s(&pCout, "CONOUT$", "w", stdout);
        SetConsoleTitle(L"Debug Console");

    }

    // set std::cout to use my custom streambuf
    outbuf ob;
    std::streambuf *sb = std::cout.rdbuf(&ob);

    // do some work here

    printf("Hello!\n");

    HANDLE stdHandle = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO consoleInfo;
    WORD defaultConsoleTextAttributes;
    GetConsoleScreenBufferInfo(stdHandle, &consoleInfo);
    defaultConsoleTextAttributes = consoleInfo.wAttributes;
    WORD currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_RED;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "nShowCmd = " << nShowCmd << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_BLUE;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_BLUE | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_RED;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_RED | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_BLUE;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_RED;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_BLUE | FOREGROUND_RED;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;
    currentConsoleTextAttributes = FOREGROUND_BLUE | FOREGROUND_RED | FOREGROUND_INTENSITY;
    SetConsoleTextAttribute(stdHandle, currentConsoleTextAttributes);
    std::cout << "Now making my first Windows window!" << std::endl;



    // make sure to restore the original so we don't get a crash on close!
    std::cout.rdbuf(sb);

    Sleep(5000);
    ShowWindow(GetConsoleWindow(), SW_HIDE);
    FreeConsole();

    MessageBoxW (NULL,
                 L"Hello World!",
                 L"hello",
                 MB_OK | MB_ICONINFORMATION);

    return 0;
}

现在剩下的就是使其成为一个完整的日志记录类。