win遍历所有硬件

//! 遍历完所有磁盘，我们还很蛋疼地想遍历所有硬件。

#include "stdafx.h"
#include 
#include 
#include 
#include 
#include 
#include 

int main( int argc, char *argv[ ], char *envp[ ] )
{
    setlocale(LC_ALL, "chs");

    HDEVINFO hDevInfo;
    SP_DEVINFO_DATA DeviceInfoData;
    DWORD i;

    // Create a HDEVINFO with all present devices.
    hDevInfo = SetupDiGetClassDevs(NULL,
        0, // Enumerator
        0,
        DIGCF_PRESENT | DIGCF_ALLCLASSES );

    if (hDevInfo == INVALID_HANDLE_VALUE)
    {
        // Insert error handling here.
        return 1;
    }

    // Enumerate through all devices in Set.

    DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
    for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
        &DeviceInfoData);i++)
    {
        DWORD DataT;
        LPTSTR buffer = NULL;
        DWORD buffersize = 0;

        //
        // Call function with null to begin with,
        // then use the returned buffer size
        // to Alloc the buffer. Keep calling until
        // success or an unknown failure.
        //
        while (!SetupDiGetDeviceRegistryProperty(
            hDevInfo,
            &DeviceInfoData,
            SPDRP_DEVICEDESC,
            &DataT,
            (PBYTE)buffer,
            buffersize,
            &buffersize))
        {
            if (GetLastError() ==
                ERROR_INSUFFICIENT_BUFFER)
            {
                // Change the buffer size.
                if (buffer) LocalFree(buffer);
                buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);

            }
            else
            {
                // Insert error handling here.
                break;
            }
        }
        _tprintf(_T( "Result: %s\n "),buffer);

        if (buffer) LocalFree(buffer);
    }


    if ( GetLastError()!=NO_ERROR &&
        GetLastError()!=ERROR_NO_MORE_ITEMS )
    {
        // Insert error handling here.
        return 1;
    }

    //  Cleanup
    SetupDiDestroyDeviceInfoList(hDevInfo);

    system( "pause");

    return 0;
}