VC 里面使用 OnDeviceChange( UINT nEventType, DWORD dwData ); 1.在类声明处添加成员函数
protected:
afx_msg BOOL OnDeviceChange( UINT nEventType, DWORD dwData );
2.在相应的cpp文件中加入BOOL OnDeviceChange(UINT, DWORD)的函数体;
BOOL CXXXXX::OnDeviceChange( UINT nEventType, DWORD dwData )
{
if(nEventType == DBT_DEVICEARRIVAL)
MessageBox("CD arrival","Note",MB_OK+MB_ICONINFORMATION);
return TRUE;}
3。在消息映射宏中加入
BEGIN_MESSAGE_MAP(CXXXXXX, CDialog)
//{{AFX_MSG_MAP(CTest031Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AF
请问在delphi里面 Ondevicechange 怎样使用啊
protected:
afx_msg BOOL OnDeviceChange( UINT nEventType, DWORD dwData );
2.在相应的cpp文件中加入BOOL OnDeviceChange(UINT, DWORD)的函数体;
BOOL CXXXXX::OnDeviceChange( UINT nEventType, DWORD dwData )
{
if(nEventType == DBT_DEVICEARRIVAL)
MessageBox("CD arrival","Note",MB_OK+MB_ICONINFORMATION);
return TRUE;}
3。在消息映射宏中加入
BEGIN_MESSAGE_MAP(CXXXXXX, CDialog)
//{{AFX_MSG_MAP(CTest031Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AF
请问在delphi里面 Ondevicechange 怎样使用啊
procedure WMDevicechange(var Message: TMessage);
message WM_DEVICECHANGE;procedure TForm1.WMDevicechange(var Message: TMessage);
const
DBT_DEVICEARRIVAL=$8000;
DBT_DEVICEREMOVECOMPLETE=$8004;
begin
try
case Message.WParam of
DBT_DEVICEARRIVAL:
showmessage('光驱弹入');
DBT_DEVICEREMOVECOMPLETE:
showmessage('光驱弹出');
end;
except
showmessage('出错');
end;
end;