麻烦大侠给我讲解一下程序。这个程序是读取一下monitor信息的。

Question

这程序怎么看不懂。有大虾帮讲解一下几个关键的函数吗？这都是哪里冒出来的函数呀？#include "windows.h"
#include "setupapi.h"
#include "initguid.h"
#include "stdio.h"#define NAME_SIZE   128
#define PRINT(_x_) printf _x_DEFINE_GUID (GUID_CLASS_MONITOR,
        0x4d36e96e, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1,
0x03, 0x18);static void
PlayWithDeviceInfo(
 IN HDEVINFO devInfo,
 IN PSP_DEVINFO_DATA devInfoData
 )
{
    HKEY    hDevRegKey;
    DWORD   uniID[123];    if (SetupDiGetDeviceRegistryProperty(
            devInfo,
            devInfoData,
            SPDRP_DEVICEDESC,//SPDRP_UI_NUMBER,
            NULL,
            (PBYTE)(&uniID),
            sizeof(uniID),
            NULL))
    {
        printf("UID: %s\n",uniID);
    }
    else {
        printf("ERROR: %d\n",GetLastError());
    }    hDevRegKey = SetupDiOpenDevRegKey(
        devInfo,
        devInfoData,
        DICS_FLAG_GLOBAL,
        0,
        DIREG_DEV,
        KEY_ALL_ACCESS);    if (hDevRegKey) {
        LONG retValue,i;
        DWORD   dwType, AcutalValueNameLength= NAME_SIZE;        CHAR    valueName[NAME_SIZE];        for (i = 0, retValue = ERROR_SUCCESS; retValue !=
ERROR_NO_MORE_ITEMS; i++)
        {
            unsigned char EDIDdata[1024];
            DWORD   j,edidsize=sizeof(EDIDdata);            retValue = RegEnumValue (
                            hDevRegKey,
                            i,
                            &valueName[0],
                            &AcutalValueNameLength,
                            NULL,//reserved
                            &dwType,
                            EDIDdata, // buffer
                            &edidsize); // buffer size            if (retValue == ERROR_SUCCESS )
            {
                if (!strcmp(valueName,"EDID")) {
                    printf("Found value EDID\n");
                    {                        for (j=0;j<edidsize;j++) {
                            if (j %16 == 0) printf("\n");
                            printf("%02x ",EDIDdata[j]);
                        }
                        printf("\n");
                    }                    break;
                }
            }
        }        RegCloseKey(hDevRegKey);
    }
    else {
        printf("ERROR:%d\n",GetLastError());
    }}
int EnumDevices()
{
 HDEVINFO      devInfo = NULL;
 SP_DEVINFO_DATA     devInfoData;
 SP_DEVINFO_LIST_DETAIL_DATA  devInfoSetDetailData;
 ULONG       i; do
 {  devInfo = SetupDiGetClassDevsEx(
      &GUID_CLASS_MONITOR, //class GUID
      NULL, //enumerator
      NULL, //HWND
      DIGCF_PRESENT, // Flags //DIGCF_ALLCLASSES|
      NULL, // device info, create a new one.
      NULL, // machine name, local machine
      NULL);// reserved  if (NULL == devInfo)
  {
   //PrintWin32Error("SetupDiGetClassDevsEx");
   break;
  }  for (i=0;ERROR_NO_MORE_ITEMS != GetLastError();i++)
  {   memset(&devInfoData,0,sizeof(devInfoData));
   devInfoData.cbSize = sizeof(devInfoData);   if (SetupDiEnumDeviceInfo(devInfo,i,&devInfoData))
   {
    PlayWithDeviceInfo(devInfo,&devInfoData);
   }
  } } while (FALSE); return i;
}int __cdecl main()
{
    EnumDevices();
    return 0;
}

Answer 1

#include "windows.h"
#include "setupapi.h"
#include "initguid.h"
#include "stdio.h"#define NAME_SIZE   128
#define PRINT(_x_) printf _x_DEFINE_GUID (GUID_CLASS_MONITOR,
        0x4d36e96e, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1,
0x03, 0x18);static void
PlayWithDeviceInfo(
 IN HDEVINFO devInfo,
 IN PSP_DEVINFO_DATA devInfoData
 )
{
    HKEY    hDevRegKey;
    DWORD   uniID[123];    if (SetupDiGetDeviceRegistryProperty(//得到指定的PNP设备注册属性
            devInfo,
            devInfoData,
            SPDRP_DEVICEDESC,//SPDRP_UI_NUMBER,返回设备表述信息
            NULL,
            (PBYTE)(&uniID),
            sizeof(uniID),
            NULL))
    {
        printf("UID: %s\n",uniID);
    }
    else {
        printf("ERROR: %d\n",GetLastError());
    }    hDevRegKey = SetupDiOpenDevRegKey(//为指定的设备打开注册表键值
        devInfo,
        devInfoData,
        DICS_FLAG_GLOBAL,
        0,
        DIREG_DEV,
        KEY_ALL_ACCESS);    if (hDevRegKey) {
        LONG retValue,i;
        DWORD   dwType, AcutalValueNameLength= NAME_SIZE;        CHAR    valueName[NAME_SIZE];        for (i = 0, retValue = ERROR_SUCCESS; retValue !=
ERROR_NO_MORE_ITEMS; i++)
        {
            unsigned char EDIDdata[1024];
            DWORD   j,edidsize=sizeof(EDIDdata);            retValue = RegEnumValue (
                            hDevRegKey,
                            i,
                            &valueName[0],
                            &AcutalValueNameLength,
                            NULL,//reserved
                            &dwType,
                            EDIDdata, // buffer
                            &edidsize); // buffer size            if (retValue == ERROR_SUCCESS )
            {
                if (!strcmp(valueName,"EDID")) {
                    printf("Found value EDID\n");
                    {                        for (j=0;j<edidsize;j++) {
                            if (j %16 == 0) printf("\n");
                            printf("%02x ",EDIDdata[j]);
                        }
                        printf("\n");
                    }                    break;
                }
            }
        }        RegCloseKey(hDevRegKey);
    }
    else {
        printf("ERROR:%d\n",GetLastError());
    }}
int EnumDevices()
{
 HDEVINFO      devInfo = NULL;
 SP_DEVINFO_DATA     devInfoData;
 SP_DEVINFO_LIST_DETAIL_DATA  devInfoSetDetailData;
 ULONG       i; do
 {  devInfo = SetupDiGetClassDevsEx(//通过设备类GUID得到设备信息句柄
      &GUID_CLASS_MONITOR, //class GUID
      NULL, //enumerator
      NULL, //HWND
      DIGCF_PRESENT, // Flags //DIGCF_ALLCLASSES|
      NULL, // device info, create a new one.
      NULL, // machine name, local machine
      NULL);// reserved  if (NULL == devInfo)
  {
   //PrintWin32Error("SetupDiGetClassDevsEx");
   break;
  }  for (i=0;ERROR_NO_MORE_ITEMS != GetLastError();i++)
  {   memset(&devInfoData,0,sizeof(devInfoData));
   devInfoData.cbSize = sizeof(devInfoData);   if (SetupDiEnumDeviceInfo(devInfo,i,&devInfoData))//枚举设备信息
   {
    PlayWithDeviceInfo(devInfo,&devInfoData);//通过注册表得到信息
   }
  } } while (FALSE); return i;
}int __cdecl main()
{
    EnumDevices();
    return 0;
}
我注视的地方都是关键函数，具体应用察看MSDN