不进入控制台应用程序上的 Windows GetMessage 循环

I want to detect keypress in C++ and i need to use Windows System Call. So, i did some research and this is what i got using Hooks and Message:

#include <Windows.h>
#include <iostream>
#include <sstream>
#include <fstream>
#include <ctime>

using namespace std;

LRESULT CALLBACK LowLevelKeyboardProc(int code, WPARAM wParam, LPARAM lParam) {
    if (code == HC_ACTION) {
        switch (wParam) {
        case WM_KEYDOWN:
            PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT)lParam;
            char c = char(MapVirtualKey(p->vkCode, MAPVK_VK_TO_CHAR));
            cout << c << endl;
        }
    }
    return CallNextHookEx(NULL, code, wParam, lParam);
}

int main() {    
    HHOOK HKeyboard = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, 0, 0);

    MSG msg;
    BOOL bRet;

    while ((bRet = GetMessage(&msg, NULL, 0, 0)) > 0) {
        cout << "bRet = " << bRet << endl; // I want to do something here, but the program doesn't seem to go in here
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnhookWindowsHookEx(HKeyboard);
    return 0;
}

我的问题是为什么我的程序没有进入循环内部(而是停留在 GetMessage 函数上)?我需要它来设置几秒钟后终止的条件，那么我应该把条件放在哪里?我知道 GetMessage 函数读取 Message，但是当我按下键盘上的键时它仍然无法进入，并且回调函数工作正常.