Window监控USB设备插拔动作，C语言

要在Windows上监控USB设备的插拔动作，可以使用Windows API函数来实现。以下是一个使用C语言编写的示例代码：

#include <Windows.h>
#include <Dbt.h>
#include <stdio.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        case WM_DEVICECHANGE:
        {
            PDEV_BROADCAST_HDR pBroadcastHdr = (PDEV_BROADCAST_HDR)lParam;
            if (pBroadcastHdr != NULL)
            {
                switch (wParam)
                {
                    case DBT_DEVICEARRIVAL:
                    {
                        PDEV_BROADCAST_DEVICEINTERFACE pBroadcastDevInterface = (PDEV_BROADCAST_DEVICEINTERFACE)pBroadcastHdr;
                        if (pBroadcastDevInterface->dbcc_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
                        {
                            printf("USB device inserted\n");
                            // 在这里处理USB设备插入后的操作
                        }
                        break;
                    }
                    case DBT_DEVICEREMOVECOMPLETE:
                    {
                        PDEV_BROADCAST_DEVICEINTERFACE pBroadcastDevInterface = (PDEV_BROADCAST_DEVICEINTERFACE)pBroadcastHdr;
                        if (pBroadcastDevInterface->dbcc_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
                        {
                            printf("USB device removed\n");
                            // 在这里处理USB设备拨出后的操作
                        }
                        break;
                    }
                }
            }
            break;
        }
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

int main()
{
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = GetModuleHandle(NULL);
    wc.lpszClassName = "USBDeviceMonitor";

    if (!RegisterClass(&wc))
    {
        printf("Failed to register window class\n");
        return 1;
    }

    HWND hWnd = CreateWindowEx(0, wc.lpszClassName, "", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
    if (hWnd == NULL)
    {
        printf("Failed to create window\n");
        return 1;
    }

    DEV_BROADCAST_DEVICEINTERFACE notificationFilter = {0};
    notificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    notificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    notificationFilter.dbcc_classguid = GUID_DEVINTERFACE_USB;

    HDEVNOTIFY hDevNotify = RegisterDeviceNotification(hWnd, &notificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);
    if (hDevNotify == NULL)
    {
        printf("Failed to register device notification\n");
        return 1;
    }

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

    UnregisterDeviceNotification(hDevNotify);
    DestroyWindow(hWnd);

    return 0;
}

在上面的代码中，我们创建了一个窗口，并在窗口的回调函数`WndProc`中处理`WM_DEVICECHANGE`消息，该消息会在设备插拔时触发。通过检查`wParam`参数和设备类型，我们可以确定是设备插入还是拨出，并在相应的分支中执行相应的操作。

请注意，该示例代码是一个简化的示例，只演示了如何监控USB设备的插拔动作。在实际应用中，您可能需要根据需要进行更多的处理，例如打开和关闭设备、读取设备信息等等。