Question

vc++中WM_DEVICECHANGE消息函数该怎么添加呢

我创建了一个对话框程序，该怎么添加WM_DEVICECHANGE函数呢，找不到路径啊

Answer 1

1.添加消息

消息映射
BEGIN_MESSAGE_MAP(CAFT_1394Dlg, CDialog)
//{{AFX_MSG_MAP(CAFT_1394Dlg)
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
...
ON_WM_DEVICECHANGE()
//}}AFX_MSG_MAP

声明消息响应函数:
afx_msg BOOL OnDeviceChange(UINT nEventType, DWORD dwData);

定义函数内容:

BOOL XXXXXXX::OnDeviceChange(UINT nEventType,DWORD dwData)
{
DEV_BROADCAST_DEVICEINTERFACE* dbd = (DEV_BROADCAST_DEVICEINTERFACE*) dwData;

//这里进行信息匹配,比如guid等

//针对各个事件进行处理.
switch (nEventType)
{
case DBT_DEVICEREMOVECOMPLETE:
...
break;
case DBT_DEVICEARRIVAL:
...
break;
...
...
...

default:
break;
}

return TRUE;

}

2.注册设备
if (Handle == NULL)
return FALSE;

DEV_BROADCAST_DEVICEINTERFACE DevInt;
memset(&DevInt,0,sizeof(DEV_BROADCAST_DEVICEINTERFACE));
DevInt.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
DevInt.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;

DevInt.dbcc_classguid = GetCurrentUSBGUID();//m_usb->GetDriverGUID();
if (!RegisterDeviceNotification(m_hWnd, &DevInt,DEVICE_NOTIFY_WINDOW_HANDLE) )
return FALSE;

只有注册了该设备,OnDeviceChange才能获得详细的信息,否则收到的参数都是0007.

手动添加吧

我也没找到

Answer 2

1.添加消息

消息映射
BEGIN_MESSAGE_MAP(CAFT_1394Dlg, CDialog)
//{{AFX_MSG_MAP(CAFT_1394Dlg)
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
...
ON_WM_DEVICECHANGE()
//}}AFX_MSG_MAP

声明消息响应函数:
afx_msg BOOL OnDeviceChange(UINT nEventType, DWORD dwData);

定义函数内容:

BOOL XXXXXXX::OnDeviceChange(UINT nEventType,DWORD dwData)
{
DEV_BROADCAST_DEVICEINTERFACE* dbd = (DEV_BROADCAST_DEVICEINTERFACE*) dwData;

//这里进行信息匹配,比如guid等

//针对各个事件进行处理.
switch (nEventType)
{
case DBT_DEVICEREMOVECOMPLETE:
...
break;
case DBT_DEVICEARRIVAL:
...
break;
...
...
...

default:
break;
}

return TRUE;

}