开发USB HID的源码,调用SetupDiGetDeviceInterfaceDetail报错

开发USB HID的源码,调用SetupDiGetDeviceInterfaceDetail出错?
调用第一次SetupDiGetDeviceInterfaceDetail出错,返回122.这没有问题.可是为何第二次调用怎么还是出现1784-提供给请求操作的用户缓冲区无效呢.
我网上查阅的大量例子,发现我的程序是没有问题的啊,请高手帮忙看一下呢

private: // User declarations

DWORD       ActualBytesRead;
DWORD       BytesRead;
HIDP_CAPS          Capabilities;
DWORD       cbBytesRead;
PSP_DEVICE_INTERFACE_DETAIL_DATA detailData;
HANDLE    DeviceHandle;
DWORD       dwError;
HANDLE    hEventObject;
HANDLE    hDevInfo;
GUID       HidGuid;
OVERLAPPED    HIDOverlapped;
ULONG       Length;
        DWORD                            RequiredSize; //add
LPOVERLAPPED    lpOverLap;
bool MyDeviceDetected;
AnsiString    MyDevicePathName;
DWORD       NumberOfBytesRead;
HANDLE    ReadHandle;
DWORD       ReportType;
ULONG       Required;
AnsiString ValueToDisplay;
HANDLE    WriteHandle;
char       InputReport[256];
char       OutputReport[256];

boolean TUSBHID::HidUsb_Conn(int VendorID,int ProductID)
{
HIDD_ATTRIBUTES Attributes;
   // DWORD DeviceUsage;
SP_DEVICE_INTERFACE_DATA devInfoData;
bool LastDevice = FALSE;
int MemberIndex = 0;
LONG Result;

char Buffer[256];

memset(Buffer,0,sizeof(Buffer));
memset(ManufacturerString,0,sizeof(ManufacturerString));
memset(ProductString,0,sizeof(ProductString));

Length = 0;
detailData = NULL;
DeviceHandle=NULL;

//获取HID GUID
HidD_GetHidGuid(&HidGuid);
//获取指定类的设备
hDevInfo=SetupDiGetClassDevs
(&HidGuid,
NULL,
NULL,
DIGCF_PRESENT|DIGCF_DEVICEINTERFACE);

devInfoData.cbSize = sizeof(devInfoData);

MemberIndex = 0;
LastDevice = FALSE;

do
{
Result=SetupDiEnumDeviceInterfaces
(hDevInfo,
0,
&HidGuid,
MemberIndex,
&devInfoData);

if (Result != 0)
{
Result = SetupDiGetDeviceInterfaceDetail
(hDevInfo,
&devInfoData,
NULL,
0,
&RequiredSize,//&Length,
NULL);
         if (!Result) {
            //得到错误代码
            DWORD dwError = GetLastError();
            */
         }

detailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(RequiredSize);//Length);

detailData -> cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
Result = SetupDiGetDeviceInterfaceDetail
(hDevInfo,
&devInfoData,
detailData,
RequiredSize,//Length,
&Required,
NULL);
         if (!Result) {
           DWORD dwError = GetLastError();
         }

//创建设备对象
DeviceHandle=CreateFile
(detailData->DevicePath,
0,
FILE_SHARE_READ|FILE_SHARE_WRITE,
(LPSECURITY_ATTRIBUTES)NULL,
OPEN_EXISTING,
0,
NULL);

Attributes.Size = sizeof(Attributes);

//获取指定对象的属性
Result = HidD_GetAttributes
(DeviceHandle,
&Attributes);

MyDeviceDetected = FALSE;

//根据VIP,PID判断是否为所需设备
if (Attributes.VendorID == VendorID)
{
if (Attributes.ProductID == ProductID)
{
MyDeviceDetected = TRUE;
MyDevicePathName = detailData->DevicePath;
=

}

else
CloseHandle(DeviceHandle);
}

else
CloseHandle(DeviceHandle);

free(detailData);

}
else
LastDevice=TRUE;

MemberIndex = MemberIndex + 1;

}

while ((LastDevice == FALSE) && (MyDeviceDetected == FALSE));

SetupDiDestroyDeviceInfoList(hDevInfo);

return MyDeviceDetected;

}
------解决方案--------------------

开发USB HID的源码,调用SetupDiGetDeviceInterfaceDetail报错

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