奇怪问题请教高手：这段程序在EXE中正常执行，在DLL中调用则不能正常执行。

下面这段程序是网上参考的，用来获得磁盘产品ID。如果这段程序编译EXE可以正常执行。但编译为DLL后调用，DeviceIoControl不能正常执行，GetLastError返回87，The parameter is incorrect.
各位高手帮忙。

void GetDeviceName(int device)
{
PSTORAGE_DEVICE_DESCRIPTOR pDevDesc;
STORAGE_PROPERTY_QUERY Query;// 查询输入参数
DWORD dwOutBytes;// IOCTL输出长度
BOOL bResult;// IOCTL 返回值
LPBYTE p;
BYTE outBuf[sizeof(STORAGE_DEVICE_DESCRIPTOR)+512-1];

char dev_name[128];
char DeviceName[128];

sprintf(dev_name,("\\\\.\\PHYSICALDRIVE%d"),device);
HANDLE hDevice = CreateFileA(
dev_name,
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING ,
0,
0
);
if (hDevice == INVALID_HANDLE_VALUE)
{
return;
}

// 设置查询参数
Query.PropertyId = StorageDeviceProperty;
Query.QueryType = PropertyStandardQuery;

pDevDesc=(PSTORAGE_DEVICE_DESCRIPTOR)outBuf;
pDevDesc->Size = sizeof(STORAGE_DEVICE_DESCRIPTOR) + 512 - 1;
// 设置查询参数
bResult = DeviceIoControl(hDevice,// 设备句柄
IOCTL_STORAGE_QUERY_PROPERTY,// 设备属性信息
&Query, sizeof(STORAGE_PROPERTY_QUERY),// 输出buffer
pDevDesc, sizeof(STORAGE_DEVICE_DESCRIPTOR)+512-1,// 输出buffer
&dwOutBytes,// 输出长度
(LPOVERLAPPED)NULL);
if(bResult){
MessageBoxA(NULL,"调用成功","成功",MB_OK);
}else{
char t[15];
_ltoa(GetLastError(),t,10);
MessageBox(NULL,t,"错误编号",MB_OK);
}

p = (PUCHAR) outBuf;
int index=0;

//获取VerdorID
if ( pDevDesc->VendorIdOffset && p[pDevDesc->VendorIdOffset] )
{

for(int i=pDevDesc->VendorIdOffset; p[i] != (UCHAR)NULL && i<(int)dwOutBytes; i++ )
{
DeviceName[index]=p[i];
index++;
if(p[i]==' ' && p[i+1]==' ') break;//去掉多余空格
}
}

//获取ProductID
if ( pDevDesc->ProductIdOffset && p[pDevDesc->ProductIdOffset] )
{
for(int i=pDevDesc->SerialNumberOffset; p[i] != (UCHAR)NULL && i<(int)dwOutBytes; i++ )
{
DeviceName[index]=p[i];
index++;
if(p[i]==' ' && p[i+1]==' ') break;//去掉多余空格
}
}
DeviceName[index]='\0';
CloseHandle(hDevice);
MessageBoxA(NULL,DeviceName,"磁盘信息",MB_OK);
return ;
}