如何检测DBT_CONFIGCHANGED信息?
先把自己的帖子定起来.
我在VC++.net (2008)里编写了个小程序来监测USB接口的信息.我发现,无论如何,我查到的信息都是DBT_PLTUSBHEADSET. USB耳机插入USB口和拔出USB耳机,都是同一个消息. 感觉很奇怪, 有没有高手指点一下,如何监测到更多的信息啊? 谢谢先!!!
#include "stdafx.h"
#include "WinMain.h"
#include <Dbt.h>
#define MAX_LOADSTRING 100
// 全局变量:
HINSTANCE hInst;
// 当前实例
TCHAR szTitle[MAX_LOADSTRING];
// 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING];
// 主窗口类名
// 此代码模块中包含的函数的前向声明:
ATOM
MyRegisterClass(HINSTANCE hInstance);
BOOL
InitInstance(HINSTANCE, int);
LRESULT CALLBACK
WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK
About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR
lpCmdLine,
int
nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: 在此放置代码。
MSG msg;
HACCEL hAccelTable;
// 初始化全局字符串
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_WINMAIN, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// 执行应用程序初始化:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINMAIN));
// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
//
函数: MyRegisterClass()
//
//
目的: 注册窗口类。
//
//
注释:
//
//
仅当希望
//
此代码与添加到 Windows 95 中的“RegisterClassEx”
//
函数之前的 Win32 系统兼容时,才需要此函数及其用法。调用此函数十分重要,
//
这样应用程序就可以获得关联的
//
“格式正确的”小图标。
//
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
= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINMAIN));
wcex.hCursor
= LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground
= (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName
= MAKEINTRESOURCE(IDC_WINMAIN);
wcex.lpszClassName
= szWindowClass;
wcex.hIconSm
= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
//
函数: InitInstance(HINSTANCE, int)
//
//
目的: 保存实例句柄并创建主窗口
//
//
注释:
//
//
在此函数中,我们在全局变量中保存实例句柄并
//
创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // 将实例句柄存储在全局变量中
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;
}
//
//
函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//
目的: 处理主窗口的消息。
//
//
WM_COMMAND
- 处理应用程序菜单
//
WM_PAINT
- 绘制主窗口
//
WM_DESTROY
- 发送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId
= LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
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;
/*
case WM_DEVMODECHANGE:
MessageBox(hWnd, _T("WM_DEVMODECHANGE"),_T("DEVMODECHANGE"), MB_OK);
break;
*/
case WM_DEVICECHANGE:
{
switch(wParam)
{
case DBT_DEVICEARRIVAL:
MessageBox(hWnd, _T("DBT_DEVICEARRIVAL"),_T("DBT_DEVICEARRIVAL"), MB_OK);
break;
case DBT_DEVICEQUERYREMOVE:
MessageBox(hWnd, _T("DBT_DEVICEQUERYREMOVE"),_T("DBT_DEVICEQUERYREMOVE"), MB_OK);
break;
case DBT_DEVICEQUERYREMOVEFAILED:
MessageBox(hWnd, _T("DBT_DEVICEQUERYREMOVEFAILED"),_T("DBT_DEVICEQUERYREMOVEFAILED"), MB_OK);
break;
case DBT_DEVICEREMOVEPENDING:
MessageBox(hWnd, _T("DBT_DEVICEREMOVEPENDING"),_T("DBT_DEVICEREMOVEPENDING"), MB_OK);
break;
case DBT_DEVICEREMOVECOMPLETE:
MessageBox(hWnd, _T("DBT_DEVICEREMOVECOMPLETE"),_T("DBT_DEVICEREMOVECOMPLETE"), MB_OK);
break;
case DBT_DEVICETYPESPECIFIC:
MessageBox(hWnd, _T("DBT_DEVICETYPESPECIFIC"),_T("DBT_DEVICETYPESPECIFIC"), MB_OK);
break;
case DBT_PLTUSBHEADSET:
// DBT_PLTUSBHEADSET == 0x0007
MessageBox(hWnd, _T("DBT_PLTUSBHEADSET"),_T("DBT_PLTUSBHEADSET"), MB_OK);
break;
case DBT_CONFIGCHANGED:
MessageBox(hWnd, _T("DBT_CONFIGCHANGED"),_T("DBT_CONFIGCHANGED"), MB_OK);
break;
default:
{
WCHAR dcinfo[20]={0};
_itow(wParam, dcinfo,sizeof(dcinfo));
MessageBox(hWnd, dcinfo,_T("Speical Value"), MB_OK);
}
break;
}
}
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}