OnDeviceChange中 截获不到DBT_DEVICEARRIVAL

[zhaohan7]

有一个USB设备，在设备管理器中显示为一个磁盘驱动器，但是它是没有盘符的， 在OnDeviceChange中，当这个设备插入或者拔插的时候产生多个DBT_DEVNODES_CHANGED, 而DBT_DEVICEARRIVAL, DBT_DEVICEREMOVECOMPLETE之类的却截获不到，如何才能截获到DBT_DEVICEARRIVAL, DBT_DEVICEREMOVECOMPLETE？(U盘之类的USB设备可以截获的到)

[zhaohan7]

请大家指点一下！！！！！！！

[zhaohan7]

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[dyw]

尝试RegisterDeviceNotification
http://msdn2.microsoft.com/en-us/library/aa363431.aspx

[zhaohan7]

一种设备的GUID是一样的吗？

[dyw]

是固定的，参考：
http://www.codeproject.com/system/HwDetect.asp

[zhaohan7]

HDEVINFO hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_DISKDRIVE, NULL, NULL, DIGCF_ALLCLASSES | DIGCF_PRESENT);

if (hDevInfo == INVALID_HANDLE_VALUE) {
return ;
}

SP_DEVINFO_DATA DeviceInfoData;
DWORD dwSize;
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);

for (int i=0;SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData);i++)
{
LPTSTR buffer = NULL;
PVOID buffer2 = NULL;
DWORD buffersize = 0;
ULONG len;
CONFIGRET cr;
PNP_VETO_TYPE pnpvietotype;
CHAR vetoname[MAX_PATH];
WCHAR VetoNameW[MAX_PATH];
ULONG ulStatus;
ULONG ulProblemNumber;

if (DeviceInfoData.ClassGuid == GUID_DEVCLASS_DISKDRIVE)
{
for (int i = 0; i < 3; i++)
{
CM_Get_Parent(&DevInstParent, DeviceInfoData.DevInst, 0);

cr = CM_Request_Device_EjectW(DevInstParent, &pnpvietotype, VetoNameW, len, 0);
if ( CR_SUCCESS == cr )
{
CString temp;
temp.Format("OK - CM_Request_Device_Eject()[%d]\n", cr);
AfxMessageBox(temp);
}
else
{
TRACE("ERROR - CM_Request_Device_Eject()[%d]\n", cr);
TRACE("ERROR - CM_Request_Device_Eject()[%d]\n", GetLastError());
}

Sleep(500);
}
}

[zhaohan7]

HDEVINFO hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_DISKDRIVE, NULL, NULL, DIGCF_ALLCLASSES | DIGCF_PRESENT);

if (hDevInfo == INVALID_HANDLE_VALUE) {
return ;
}

SP_DEVINFO_DATA DeviceInfoData;
DWORD dwSize;
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);

for (int i=0;SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData);i++)
{
LPTSTR buffer = NULL;
PVOID buffer2 = NULL;
DWORD buffersize = 0;
ULONG len;
CONFIGRET cr;
PNP_VETO_TYPE pnpvietotype;
CHAR vetoname[MAX_PATH];
WCHAR VetoNameW[MAX_PATH];
ULONG ulStatus;
ULONG ulProblemNumber;

DEVINST DevInstParent = 0;
if (DeviceInfoData.ClassGuid == GUID_DEVCLASS_DISKDRIVE)
{
for (int i = 0; i < 3; i++)
{

cr = CM_Request_Device_EjectW(DevInstParent, &pnpvietotype, VetoNameW,
len, 0);
if ( CR_SUCCESS == cr )
{
CString temp;
temp.Format("OK - CM_Request_Device_Eject()[%d]\n", cr);
AfxMessageBox(temp);
}
else
{
TRACE("ERROR - CM_Request_Device_Eject()[%d]\n", cr);
TRACE("ERROR - CM_Request_Device_Eject()[%d]\n", GetLastError());
}

Sleep(500);
}
}

[zhaohan7]

为什么 cr 老是返回 19 （介质写保护）

[zhaohan7]

解决了谢谢