在控制台应用程序中使用空的Windows消息队列

问题描述

在下面的（可编译的）示例中，我试图在一个简单的控制台应用程序中侦听Windows消息队列，以接收关于正在连接/断开的USB设备的通知。我从这里获取示例代码：

In the below (compilable) example I'm trying to listen to the windows message queue in a plain console application in order to receive notifications about USB devices being connected/disconnected. I took the sample code from here: Detecting USB insertion/Removal in C++ non-GUI application

但是， GetMessage code> while -clause永远不会返回，因为Windows不会向队列发送任何消息。我做错了什么？这与UIPI有什么关系？

However, the call to GetMessage in the while-clause never returns, because obviuously Windows does not send any messages to my queue. What am I doing wrong? Does this have anything to do with the UIPI?

我不经常使用MFC / WinAPI，所以请用详细的答案。

I'm not working with MFC/WinAPI frequently, so please be verbose with your answers.

#define ANSI
#define WIN32_LEAN_AND_MEAN
#define _WIN32_WINNT   0x0501

#include <windows.h>
#include <winuser.h>
#include <Dbt.h>

#include <string>
#include <iostream>
#include <stdexcept>

#define HID_CLASSGUID {0x4d1e55b2, 0xf16f, 0x11cf,{ 0x88, 0xcb, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30}}
#define CLS_NAME "DUMMY_CLASS"
#define HWND_MESSAGE     ((HWND)-3)

LRESULT message_handler(HWND__* hwnd, UINT uint, WPARAM wparam, LPARAM lparam)
{
    switch (uint)
    {
    case WM_NCCREATE: // before window creation
        return true;
        break;

    case WM_CREATE: // the actual creation of the window
    {
        // you can get your creation params here..like GUID..
        LPCREATESTRUCT params = (LPCREATESTRUCT) lparam;
        GUID InterfaceClassGuid = *((GUID*)params->lpCreateParams);
        DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
        ZeroMemory(&NotificationFilter, sizeof(NotificationFilter));
        NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
        NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
        NotificationFilter.dbcc_classguid = InterfaceClassGuid;
        HDEVNOTIFY dev_notify = RegisterDeviceNotification(hwnd, &NotificationFilter,
                                                           DEVICE_NOTIFY_WINDOW_HANDLE);
        if(dev_notify == NULL)
        {
            throw std::runtime_error("Could not register for devicenotifications!");
        }
        break;
    }

    case WM_DEVICECHANGE:
    {
        PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR) lparam;
        PDEV_BROADCAST_DEVICEINTERFACE lpdbv = (PDEV_BROADCAST_DEVICEINTERFACE) lpdb;
        std::string path;
        if (lpdb->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
        {
            path = std::string(lpdbv->dbcc_name);
            switch (wparam)
            {
            case DBT_DEVICEARRIVAL:
                std::cout << "new device connected: " << path << "\n";
                break;

            case DBT_DEVICEREMOVECOMPLETE:
                std::cout << "device disconnected: " << path << "\n";
                break;
            }
        }
        break;
    }

    }
    return 0L;
}

int main(int argc, char* argv[])
{
    HWND hWnd = NULL;
    WNDCLASSEX wx;
    ZeroMemory(&wx, sizeof(wx));

    wx.cbSize = sizeof(WNDCLASSEX);
    wx.lpfnWndProc = reinterpret_cast<WNDPROC>(message_handler);
    wx.hInstance = reinterpret_cast<HINSTANCE>(GetModuleHandle(0));
    wx.style = CS_HREDRAW | CS_VREDRAW;
    wx.hInstance = GetModuleHandle(0);
    wx.hbrBackground = (HBRUSH)(COLOR_WINDOW);
    wx.lpszClassName = CLS_NAME;

    GUID guid = HID_CLASSGUID;

    if (RegisterClassEx(&wx))
    {
        hWnd = CreateWindow(CLS_NAME, "DevNotifWnd", WS_ICONIC,
                            0, 0, CW_USEDEFAULT, 0, HWND_MESSAGE,
                            NULL, GetModuleHandle(0), (void*)&guid);
    }

    if(hWnd == NULL)
    {
        throw std::runtime_error("Could not create message window!");
    }

    std::cout << "waiting for new devices..\n";

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

推荐答案

WM_DEVICECHANGE 消息。所以你需要创建一个不是消息的窗口。

Message only windows do not receive WM_DEVICECHANGE messages. So you'll need to make a window that is not message only. It does not need to be visible, it just has not to be message only.

通过 0 而不是 HWND_MESSAGE 到 CreateWindow ，您的程序将开始接收 WM_DEVICECHANGE

Pass 0 instead of HWND_MESSAGE to CreateWindow, and your program will start to receive WM_DEVICECHANGE messages.

这篇关于在控制台应用程序中使用空的Windows消息队列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！