WM_DEVICECHANGE得到的消息，如何判断新设备是否是u盘？？是否是光驱

0313700000 2005-07-22 05:46:33

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0313700000 2005-08-08

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已经解决了，GetDriveType只能得到小容量的，大容量的u盘使用这个函数判断不出来
谢谢

Joe 2005-07-24

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GetLogicalDrives();得到所有的盘符.
GetDriveType(DriveItem);的返回值为Removable即为U盘

saliors 2005-07-23

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LRESULT CTestUSBDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
if(message == WM_DEVICECHANGE) //0x8000,0x8004
{
CString str;
DEV_BROADCAST_HDR* dhr = (DEV_BROADCAST_HDR *)lParam;
switch(wParam)
{
case DBT_CONFIGCHANGECANCELED:
TRACE("DBT_CONFIGCHANGECANCELED");
break;
case DBT_CONFIGCHANGED:
TRACE("DBT_CONFIGCHANGED");
break;
case DBT_DEVICEQUERYREMOVE:
TRACE("DBT_DEVICEQUERYREMOVE");
break;
case DBT_DEVICEQUERYREMOVEFAILED:
TRACE("DBT_DEVICEQUERYREMOVEFAILED");
break;
case DBT_DEVICEREMOVEPENDING:
TRACE("DBT_DEVICEREMOVEPENDING");
break;
case DBT_DEVICETYPESPECIFIC:
TRACE("DBT_DEVICETYPESPECIFIC");
break;
case DBT_QUERYCHANGECONFIG:
TRACE("DBT_QUERYCHANGECONFIG");
break;
case DBT_USERDEFINED:
TRACE("DBT_USERDEFINED");
break;
case DBT_DEVICEARRIVAL:
if(dhr->dbch_devicetype == DBT_DEVTYP_VOLUME)
{
PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)dhr;
if(lpdbv->dbcv_flags & DBTF_MEDIA)
{
str.Format("Drive %c 插入", FirstDriveFromMask(lpdbv ->dbcv_unitmask));
//AfxMessageBox(str);
}
else
{
char ch = FirstDriveFromMask(lpdbv ->dbcv_unitmask);
str.Format("%c:\\",ch);
}
}
break;
case DBT_DEVICEREMOVECOMPLETE:
if(dhr->dbch_devicetype == DBT_DEVTYP_VOLUME)
{
PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)dhr;
if(lpdbv->dbcv_flags & DBTF_MEDIA)
{
str.Format("Drive %c 拔除",FirstDriveFromMask(lpdbv ->dbcv_unitmask));
}
else
{
str.Format("Drive %c 拔除",FirstDriveFromMask(lpdbv ->dbcv_unitmask));
}
//AfxMessageBox(str);
}
break;
default:
break;
}
}
return CDialog::WindowProc(message, wParam, lParam);
}