AllocConsole之重新打开stdin，stdout，stderr

在win32程序中如果需要控制台
可以调用API：
AllocConsole()

#include<windows.h>
#include<iostream>



int WINAPI WinMain(HINSTANCE hpreinstance, HINSTANCE hinstance,LPSTR str, int show)
{
    AllocConsole();
    freopen("conout$","w",stdout);
    using Fun_Sub = int(*)(int, int);
    Fun_Sub sub;
    HINSTANCE mydll;
    try{
        mydll = LoadLibrary(TEXT("./../Debug/DLL.dll"));
        if (NULL == mydll)
            throw 0;
        sub = (Fun_Sub)GetProcAddress(mydll,"Sub");
        if (NULL == sub)
            throw 1;
    }
    catch (int &e)
    {
        if (0 == e)
            std::cout << "加载dll失败" << std::endl;
        if (1 == e)
            std::cout << "获取函数Sub失败" << std::endl;
        FreeLibrary(mydll);
        return -1;
    }

    std::cout << "call Sub" << sub(12, 5);
    FreeLibrary(mydll);
    FreeConsole();

    return 0;
}


----------
ps:此篇由笔者临时需要却忘记conout$而记，上述代码可以不引用dll库，阅者自改，贴一下代码，保持程序完整性

----------


dll：
// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include "stdafx.h"
#include<windows.h>

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        MessageBox(NULL,L"dll was loading...",L"caption:",MB_OK);
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:

    case DLL_PROCESS_DETACH:
        MessageBox(NULL, L"dll was unloading...", L"caption:", MB_OK);
        break;
    }
    return TRUE;
}

__declspec(dllexport) int __stdcall add(int a, int b)
{
    return a + b;
}
__declspec(dllexport) int __cdecl sub(int a, int b)
{
    return a - b;
}


extern "C" __declspec(dllexport) int __stdcall Add(int a, int b)
{
    return a + b;
}
extern "C" __declspec(dllexport) int __cdecl Sub(int a, int b)
{
    return a - b;
}

---

freopen();

特殊文件名：”conout&”,”conin$”,”conerr”;