RJ10DLL::CheckDeviceChangings
int CheckDeviceChangings( UINT
nEventType, DWORD dwData );
Return Value
- DEVICE_NOT_READY
-
DEVICE_FIRST_ARIVAL
- DEVICE_NOT_FOUND
- DEVICE_READY
- DEVICE_NOW_READY
- -100
|
0
-98
-1
1
2
100 |
device
was not ready
the first messages
after program start
the device ist not connected
device found an ready
device is allready connected
this was not a valid message |
Parameters
nEventType
An event type. See CWnd::OnDeviceChange the Remarks section for a description
dwData
The address of a structure that contains event-specific
data.
Its meaning depends on the given event.
Remarks
Check device changings by message OnDeviceChange.
If you set
nEventType and
dwData to the result of OnDeviceChange
and it is a RadioJet-Message,
then one of the following two messages are generated:
WM_HID_JET_ADD
WM_HID_JET_REMOVE
If you set
nEventType and
dwData to NULL, then you check the device status.
If you set
nEventType and
dwData to -1, then you close device and audio actions
and you get back alltimes DEVICE_NOT_READY.
Example
see on RJ10Mini SourceExample:
CRJ10MiniDlg::DeviceRemoved and
CRJ10MiniDlg::StartAction
#include <dbt.h>
BEGIN_MESSAGE_MAP(CRJ10MiniDlg, CDialog)
//{{AFX_MSG_MAP(CRJ10MiniDlg)
ON_WM_DEVICECHANGE()
ON_MESSAGE(WM_HID_JET_ADD, DeviceAdd)
ON_MESSAGE(WM_HID_JET_REMOVE, DeviceRemoved)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
BOOL CRJ10MiniDlg::OnDeviceChange( UINT nEventType, DWORD dwData )
{
CheckDeviceChangings(nEventType,dwData);
return FALSE;
}
LRESULT CRJ10MiniDlg::DeviceAdd(WPARAM wParam, LPARAM lParam)
{
LastDeviceCheck=CheckDeviceChangings(0,0);
if(LastDeviceCheck==DEVICE_READY) return TRUE;
if(LastDeviceCheck==DEVICE_NOW_READY)
{
OpenReceiver(m_hWnd,myDIR,0);
if(OpenIFInput(m_hWnd,m_IFinpuThread->m_nThreadID))
{
ImOpen=1;
m_IFinpuThread->ResumeThread();
ActivateIFInput(1);
}
}
return NULL;
}
LRESULT CRJ10MiniDlg::DeviceRemoved(WPARAM wParam, LPARAM lParam)
{
ImOpen=0;
LastDeviceCheck=CheckDeviceChangings(-1,-1);
m_IFinpuThread->SuspendThread();
ActivateIFInput(0);
return NULL;
}
See Also -->
MyPoti.h,
MyPoti.cpp,
RJ10M-DLL.h
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