VC 显示设备管理器中有错误的设备

// PrintDeviceInfo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <Windows.h>
#include <setupapi.h>
#include <cfgmgr32.h>

#pragma comment(lib, "setupapi.lib")

int  _tmain(int  argc, _TCHAR* argv[])
{

	HDEVINFO hDevInfo;
	SP_DEVINFO_DATA DeviceInfoData;
	DWORD  i;

	// 得到所有设备 HDEVINFO      
	hDevInfo = SetupDiGetClassDevs(NULL, 0, 0, DIGCF_PRESENT | DIGCF_ALLCLASSES);

	if (hDevInfo == INVALID_HANDLE_VALUE)
		return  0;

	// 循环列举     
	DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
	for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
	{
		char  szClassBuf[MAX_PATH] = { 0 };
		char  szDescBuf[MAX_PATH] = { 0 };
		DWORD dwDevStatus, dwProblem;

		// 获取类名  
		if (!SetupDiGetDeviceRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_CLASS, NULL, (PBYTE)szClassBuf, MAX_PATH - 1, NULL))
			continue;

		//获取设备描述信息
		if (!SetupDiGetDeviceRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_DEVICEDESC, NULL, (PBYTE)szDescBuf, MAX_PATH - 1, NULL))
			continue;

		CM_Get_DevNode_Status(&dwDevStatus, &dwProblem, DeviceInfoData.DevInst, 0);
		
		if (dwProblem != 0) {
			wprintf(L"Below device has a error:\r\n   Class:%s\r\n   Desc:%s\r\n\r\n", szClassBuf, szDescBuf);
		}

	}

	//  释放     
	SetupDiDestroyDeviceInfoList(hDevInfo);

	wprintf(L"Press anykey to exit.");
	getchar();

	return  0;
}