枚举系统中已经安装的所有硬件设备

实现的主要部分代码：

#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>
#pragma comment(lib,"Setupapi.lib")

 CListBox m_strList;

........

枚举所有硬件设备的主要实现代码：

    m_strList.ResetContent();
 
    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 ;
    }
   
    // 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 = (char*)LocalAlloc(LPTR,buffersize);
            }
            else
            {
                // Insert error handling here.
                break;
            }
        }

  m_strList.AddString(buffer);
               
        if (buffer) LocalFree(buffer);
    }
   
   
    if ( GetLastError()!=NO_ERROR &&
  GetLastError()!=ERROR_NO_MORE_ITEMS )
    {
        // Insert error handling here.
        return ;
    }
   
    //  Cleanup
    SetupDiDestroyDeviceInfoList(hDevInfo); 

测试环境：

WINXP,WIN2000以上操作系统！

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