想写一个枚举硬盘分区的dll

我想写一个枚举硬盘分区的dll，代码如下enumpartition.h


#ifndef _ENUMPARTITION_H_


#define _ENUMPARTITION_H_


#define DLLIMPORT __declspec (dllexport)


typedef struct _EtParition


{


	CHAR *path;


} EtPartition;


EtPartition                            et_pis[20];


ULONG                                  et_np=0;


DLLIMPORT ULONG et_init();


DLLIMPORT CHAR* et_path(ULONG i);


DLLIMPORT UCHAR et_type(ULONG i);


DLLIMPORT LONGLONG et_size(ULONG i);


#endif

enumpartition.c
#include
#include
#include
#include
#include // Guid definition
#include // Device guids
#include // for SetupDiXxx functions.
#include // for SetupDiXxx functions.
#include
#include
#include
#include

BOOL APIENTRY DllMain(HINSTANCE hInstance,
DWORD reason,
{
return TRUE;
}
BOOL GetDeviceProperty(HDEVINFO IntDevInfo, DWORD Index )
{
SP_DEVICE_INTERFACE_DATA interfaceData;
}
DLLIMPORT ULONG et_init()
{
HDEVINFO hDevInfo, hIntDevInfo;
}
DLLIMPORT CHAR* et_path(ULONG i)
{
if(i>=et_np)return NULL;
}
DLLIMPORT UCHAR et_type(ULONG i)
{
if(i>=et_np)return NULL;
}
DLLIMPORT LONGLONG et_size(ULONG i)
{
if(i>=et_np)return NULL;
}

sources
TARGETNAME=enumpartition
TARGETTYPE=DYNLINK
TARGETPATH=obj
TARGETLIBS=$(DDK_LIB_PATH)/setupapi.lib
INCLUDES=$(BASEDIR)/inc;
SOURCES=enumpartition.c

我在ddk的build环境下用build编译，却出现如下错误
BUILD: Adding /Y to COPYCMD so xcopy ops won't hang.
BUILD: Object root set to: ==> objchk_wxp_x86
BUILD: Compile and Link for i386
BUILD: Loading C:/WINDDK/3790/build.dat...
BUILD: Computing Include file dependencies:
BUILD: Examining d:/enumpartition directory for files to compile.
    d:/enumpartition - 1 source files (166 lines)
BUILD: Compiling d:/enumpartition directory
Compiling - enumpartition.c for i386
NMAKE :  U1073: don't know how to make 'enumpartition.def'
BUILD: nmake.exe failed - rc = 2
BUILD: Compile errors: not linking d:/enumpartition directory
BUILD: Done

    2 files compiled - 2 Warnings - 1 Error -   166 LPS