各位兄弟看过来,怎么解决这个问题?(windriver)

我在做一个项目，usb key-市面上的那种电子钥匙，在作上层应用时，需要频繁插拔key,此时存在一个查找key地过程,我直接调用windriver生成的一个函数,如下:
KEY_HANDLE KEY_LocateAndOpenDevice(BOOL fUseDefault)
{
KEY_HANDLE hKEY;
DWORD uniqueId = 0, configNum = 0, dwInterface = 0, dwAlternate = 0;
WD_USB_SCAN_DEVICES usbScan;
WD_USB_CONFIGURATION config;
HANDLE hWD;
DWORD scanIndex;

KEY_RegisterWinDriver();

if (!USB_Get_WD_handle(&hWD))
return NULL;

BZERO(usbScan);
if (fUseDefault)
{
usbScan.searchId.dwVendorId = KEY_DEFAULT_VENDOR_ID;
usbScan.searchId.dwProductId = KEY_DEFAULT_PRODUCT_ID;
}

WD_UsbScanDevice(hWD, &usbScan);
if (!usbScan.dwDevices)
{
printf (\"No deviced found\\n\");
WD_Close(hWD);
return NULL;
}
if (usbScan.dwDevices>1 && !fUseDefault)
{
printf (\"Please enter the unique ID of the device: \");
fgets(line, sizeof(line), stdin);
sscanf (line, \"%d\", &uniqueId);
if (!uniqueId)
return NULL;
for (scanIndex=0; scanIndex<usbScan.dwDevices; scanIndex++)
{
if (usbScan.uniqueId[scanIndex]==uniqueId)
break;
}
if (scanIndex==usbScan.dwDevices)
{
printf (\"Unique ID not found\\n\");
WD_Close(hWD);
return NULL;
}
}
else
{
uniqueId = usbScan.uniqueId[0];
scanIndex = 0;
}

if (fUseDefault)
{
configNum = KEY_DEFAULT_CONFIG;
dwInterface = KEY_DEFAULT_INTERFACE;
dwAlternate = KEY_DEFAULT_ALTERNATE;
}
else
{
configNum = 0;
if (usbScan.deviceGeneralInfo[scanIndex].dwConfigurationsNum>1)
{
printf (\"Please enter the index of the configuration: (0-%d)\"),
usbScan.deviceGeneralInfo[scanIndex].dwConfigurationsNum - 1;
fgets(line, sizeof(line), stdin);
sscanf (line, \"%d\", &configNum);
}

BZERO(config);
config.uniqueId = uniqueId;
config.dwConfigurationIndex = configNum;
WD_UsbGetConfiguration(hWD, &config);
if (config.dwInterfaceAlternatives==0)
{
printf (\"No interfaces found\\n\");
WD_Close(hWD);
return NULL;
}
if (config.dwInterfaceAlternatives==1)
{
dwInterface = config.Interface[0].Interface.dwNumber;
dwAlternate = config.Interface[0].Interface.dwAlternateSetting;
}
else
{
printf (\"Select \'Display Device Configurations\' in the main menu to learn\\n\");
printf (\"about the interfaces of the selected device\\n\");
printf (\"Please enter interface number: \");
fgets(line, sizeof(line), stdin);
sscanf (line, \"%d\", &dwInterface);
printf (\"Please enter interface alternate: \");
fgets(line, sizeof(line), stdin);
sscanf (line, \"%d\", &dwAlternate);
}
}

hKEY = KEY_Open (uniqueId, configNum, dwInterface, dwAlternate);
if (!hKEY)
{
printf (\"%s\\n\", KEY_ErrorString);
WD_Close(hWD);
return NULL;
}

WD_Close(hWD);
return hKEY;
}
通过看hKEY是否为空来判断是否有KEY,但在2000系统中运行时,如果我插拔KEY时正好调用该函数就会造成兰屏,请问我该怎么办?事情紧急,请各位兄弟帮个忙,重谢加分

key拔去时，hKEY不一定为空，有可能是一个无效的句柄呀。

key拔去时，hkey不为空，怎么把释放掉？