新人求教，C++（非MFC）中如何接收键盘消息！

wo叫xiao宝 2013-06-18 08:54:12

最近编程时遇到的问题，想要在程序里接收一个键盘消息（ESC消息），如何实现 ? 求解！
注：程序要求不使用MFC。
想在按下ESc时调用一个菜单类，进行选择退出。如何接收该键盘消息？？？？

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healer_kx 2013-06-19

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效果不错。加油。

赵4老师 2013-06-19

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#include <conio.h>
#include <windows.h>
int main() {
    int k;

    while (1) {
        if (kbhit()) {
            k=getch();
            if (0==k || 0xE0==k) k=k<<8|getch();
            if (27==k) break;//按Esc键退出
            cprintf("\r\n%04X\r\n",k);
        }
        Sleep(200);
        cprintf(".");
    }
    return 0;
}

zybjtu 2013-06-19

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对，这是windows应用程序的写法。传统，框架简单，利于学习

引用 9 楼 u010819865 的回复:

[quote=引用 4 楼 u010936098 的回复:] 看下面代码中最后一个函数中的switch结构



#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;     
TCHAR szTitle[] = _T("TestWindow");    
TCHAR szWindowClass[] = _T("WNDCLASS_of_test_window");  

ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    HACCEL hAccelTable;

    MyRegisterClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style   = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra  = 0;
    wcex.cbWndExtra  = 0;
    wcex.hInstance  = hInstance;
    wcex.hIcon   = NULL;
    wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm  = NULL;

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance;
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_KEYDOWN:
        if( wParam == VK_ESCAPE )
        {
            MessageBox( hWnd, _T("Escape is pressed!"), _T("Key down"), MB_OK);//把这句换成你的代码。
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: 在此添加任意绘图代码...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

请问一下，这是windows编程么，好想学的说···[/quote]

进击的搬砖工 2013-06-19

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引用 4 楼 u010936098 的回复:

看下面代码中最后一个函数中的switch结构



#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;     
TCHAR szTitle[] = _T("TestWindow");    
TCHAR szWindowClass[] = _T("WNDCLASS_of_test_window");  

ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    HACCEL hAccelTable;

    MyRegisterClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style   = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra  = 0;
    wcex.cbWndExtra  = 0;
    wcex.hInstance  = hInstance;
    wcex.hIcon   = NULL;
    wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm  = NULL;

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance;
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_KEYDOWN:
        if( wParam == VK_ESCAPE )
        {
            MessageBox( hWnd, _T("Escape is pressed!"), _T("Key down"), MB_OK);//把这句换成你的代码。
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: 在此添加任意绘图代码...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

请问一下，这是windows编程么，好想学的说···

酱油党 2013-06-19

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引用 4 楼 u010936098 的回复:

看下面代码中最后一个函数中的switch结构



#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;     
TCHAR szTitle[] = _T("TestWindow");    
TCHAR szWindowClass[] = _T("WNDCLASS_of_test_window");  

ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    HACCEL hAccelTable;

    MyRegisterClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style   = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra  = 0;
    wcex.cbWndExtra  = 0;
    wcex.hInstance  = hInstance;
    wcex.hIcon   = NULL;
    wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm  = NULL;

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance;
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_KEYDOWN:
        if( wParam == VK_ESCAPE )
        {
            MessageBox( hWnd, _T("Escape is pressed!"), _T("Key down"), MB_OK);//把这句换成你的代码。
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: 在此添加任意绘图代码...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

这个就可以。。。不过是WIN32的。。。估计楼主的也是

一入程序深似海 2013-06-19

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引用 3 楼 u010914313 的回复:

[quote=引用 1 楼 u010936098 的回复:] 在窗口过程中检查WM_KEYDOWN消息

不是MFC....就只有一个窗口[/quote] 所有的Windows程序都接收WM_的系统消息。你收到这个消息就可以了。不一定非得是MFC程序

梦是多么的重要 2013-06-19

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大家给楼主贴出一堆 WINDOWS编程案例。。同为菜鸟的我，只能高速楼主，C++ 只是一种编程的工具，而做成一个软件，不是只用C++ 就行的吧？楼主去看完 WINDOWS编程什么都懂了。。。

wo叫xiao宝 2013-06-19

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引用 4 楼 u010936098 的回复:

看下面代码中最后一个函数中的switch结构



#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;     
TCHAR szTitle[] = _T("TestWindow");    
TCHAR szWindowClass[] = _T("WNDCLASS_of_test_window");  

ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    HACCEL hAccelTable;

    MyRegisterClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style   = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra  = 0;
    wcex.cbWndExtra  = 0;
    wcex.hInstance  = hInstance;
    wcex.hIcon   = NULL;
    wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm  = NULL;

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance;
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_KEYDOWN:
        if( wParam == VK_ESCAPE )
        {
            MessageBox( hWnd, _T("Escape is pressed!"), _T("Key down"), MB_OK);//把这句换成你的代码。
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: 在此添加任意绘图代码...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

我们还没学windows编程，看这代码还真是晕啊

其实就是看不懂的说

一入程序深似海 2013-06-19

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引用 13 楼 u010914313 的回复:

[quote=引用 7 楼 CKnightx 的回复:] [quote=引用 3 楼 u010914313 的回复:] [quote=引用 1 楼 u010936098 的回复:] 在窗口过程中检查WM_KEYDOWN消息

不是MFC....就只有一个窗口[/quote] 所有的Windows程序都接收WM_的系统消息。你收到这个消息就可以了。不一定非得是MFC程序[/quote] 表示我只是学了半年的C++基础，什么消息的还真是不懂...

[/quote] 那就先去学Win32 程序设计吧，上来就搞MFC，很多东西你都是模糊的。步子不能迈大了，会扯着蛋

wo叫xiao宝 2013-06-19

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引用 7 楼 CKnightx 的回复:

[quote=引用 3 楼 u010914313 的回复:] [quote=引用 1 楼 u010936098 的回复:] 在窗口过程中检查WM_KEYDOWN消息

www_adintr_com 2013-06-18

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WM_KEYDOWN 又不是 MFC 定义的....

橡木疙瘩 2013-06-18

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如果是控制台应用的话，要想接收escape按键，就不能用标准输入输入函数来接收用户输入，需要使用控制台输入函数_getch():


#include <conio.h>
#include <iostream>

int _tmain(int argc, _TCHAR* argv[])
{
    int ch  = _getch();
    std::cout << ch;
    if( ch == 27 )
    {
        std::cout << "\nEscape pressed!\n";
    }
    else
    {
        std::cout << "\n" << char(ch) << " pressed!\n";
    }
	return 0;
}

橡木疙瘩 2013-06-18

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看下面代码中最后一个函数中的switch结构



#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;     
TCHAR szTitle[] = _T("TestWindow");    
TCHAR szWindowClass[] = _T("WNDCLASS_of_test_window");  

ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    HACCEL hAccelTable;

    MyRegisterClass(hInstance);
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style   = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra  = 0;
    wcex.cbWndExtra  = 0;
    wcex.hInstance  = hInstance;
    wcex.hIcon   = NULL;
    wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm  = NULL;

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance;
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_KEYDOWN:
        if( wParam == VK_ESCAPE )
        {
            MessageBox( hWnd, _T("Escape is pressed!"), _T("Key down"), MB_OK);//把这句换成你的代码。
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: 在此添加任意绘图代码...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

wo叫xiao宝 2013-06-18