给自己的程序添加一个控制台

　　有这个必要么？有！在调试的时候，通过控制台输出调试信息，可以实时跟踪程序的运行情况，比看日志文件要便捷。。。

　　代码如下：

　　

#include <iostream>
#include "conio.h"
#include <wincon.h>
#include <fcntl.h>
#include <io.h>
#include <fstream>

using namespace std;
using std::ios;


bool RedirectIoToConsole ();
bool AllocNewConsole()
{
    // If this is already a console app we don't need to call
    // RedirectToConsole().  AllocConsole() fails if this process
    // already has a console.
    return (AllocConsole() && RedirectIoToConsole());
}

bool RedirectIoToConsole ()
{
    HANDLE hStdHandle;
    int nConHandle;

    // redirect unbuffered STDOUT to the console
    hStdHandle = GetStdHandle (STD_OUTPUT_HANDLE);
    nConHandle = _open_osfhandle ((long)hStdHandle, _O_TEXT);
    *stdout = *_fdopen (nConHandle, "w");
    setvbuf (stdout, NULL, _IONBF, 1024);

    // redirect unbuffered STDIN to the console
    hStdHandle = GetStdHandle (STD_INPUT_HANDLE);
    nConHandle = _open_osfhandle ((long)hStdHandle, _O_TEXT);
    *stdin = *_fdopen (nConHandle, "r");
    setvbuf (stdin, NULL, _IOLBF, 1024);

    // redirect unbuffered STDERR to the console
    hStdHandle = GetStdHandle (STD_ERROR_HANDLE);
    nConHandle = _open_osfhandle ((long)hStdHandle, _O_TEXT);
    *stderr = *_fdopen (nConHandle, "w");
    setvbuf (stderr, NULL, _IONBF, 1024);

    // make cout, wcout, cin, wcin, wcerr, cerr, wclog and clog
    // point to console as well
    ios::sync_with_stdio();

    return true;
}

　　然后在程序初始化（或者其他你认为合适的地方）调用AllocNewConsole()函数，该函数调用后就多了一个控制台，你就可以使用printf()函数输出调试信息了，当然如果程序本身就是控制台形式的，那就没必要了。