WIN32编程 通过使用SetupDi 调用函数枚举硬件设备

要得到 Windows 2000 中安装的硬件设备列表，应用程序可以调用 SetupDi 类 API 函数。

以下代码段演示如何显示已经安装的所有硬件设备的列表：

#include <stdio.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>

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

int main( int argc, char *argv[ ], char *envp[ ] )
{
    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;
            }
        }
       
        printf("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);
   
    return 0;
}

以下代码段演示如何检索系统上的所有显示适配器组：     hDevInfo = SetupDiGetClassDevs(
        (LPGUID) &GUID_DEVCLASS_DISPLAY,
        0,
        0,
        DIGCF_PRESENT);
以下代码段演示如何检索外围组件互连 (PCI) 总线上的所有设备组：     hDevInfo = SetupDiGetClassDevs(NULL,
        REGSTR_KEY_PCIENUM, // Enumerator
        0,
        DIGCF_PRESENT | DIGCF_ALLCLASSES );