class="markdown_views prism-atom-one-light">
//枚举设备，储存起来
BOOL CMFCtestDlg::GetDeviceList(LPGUID lpGuid)
{
BOOL bFlag = TRUE;
do
{
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// 得到设备 HDEVINFO ，若是加上了| DIGCF_ALLCLASSES 则表示查询出所有设备的信息，lpGuid这个参数无效。
hDevInfo = SetupDiGetClassDevs(lpGuid, 0, 0, DIGCF_PRESENT /*| DIGCF_ALLCLASSES*/ );
if (hDevInfo == INVALID_HANDLE_VALUE)
{
printf ("SetUpDi ERR!");
bFlag = FALSE;
break;
}
cout<<"hDevInfo:"<
其中在OnInitDialog函数中：
LPGUID Class = (LPGUID)malloc(sizeof(LPGUID));
//class是USB输入设备的的类GUID
Class->Data1=0x745a17a0;
Class->Data2=0x74d3;
Class->Data3=0x11d0;
Class->Data4[0]=0xb6;
Class->Data4[1]=0xfe;
Class->Data4[2]=0x00;
Class->Data4[3]=0xa0;
Class->Data4[4]=0xc9;
Class->Data4[5]=0x0f;
Class->Data4[6]=0x57;
Class->Data4[7]=0xda;
LPGUID lpGuid=NULL;
GetDeviceList(Class);
SetDeviceStatus(theItem,0);
其中，重要的变量定义如：
DeviceInfo theItem; #define CLOSESTATE DICS_DISABLE #define OPENSTATE DICS_ENABLE #define STATE OPENSTATE
特别说明vs要以管理员身份运行。
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