如何在VC中刷新设备管理器

最新推荐文章于 2023-04-24 12:54:03 发布

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本文介绍如何通过Windows API函数动态加载cfgmgr32.dll，并调用CM_Locate_DevNodeW与CM_Reenumerate_DevNode函数来定位设备实例和重新枚举设备。这些操作对于开发涉及硬件管理和诊断的应用程序非常有用。

#include "stdafx.h"
#include <windows.h>

/*
* where use the typedef keyword, you can use the originality instead such as use DWORD instead of DEVINST
*/
typedef DWORD DEVINST;
typedef DEVINST *PDEVINST;

typedef DWORD RETURN_TYPE;
typedef RETURN_TYPE CONFIGRET;

typedef CHAR *DEVINSTID_A; // Device ID ANSI name.

#define CM_LOCATE_DEVNODE_NORMAL 0x00000000
#define CR_SUCCESS 0x00000000

/*
* this function prototype for get CM_Locate_DevNodeW function address
* how to use CM_Locate_DevNodeW function, you may see about DDK Documentation
*/
typedef CONFIGRET (__stdcall *CM_LOCATE_DEVNODE_FUNC) (
              OUT   PDEVINST       pdnDevInst,
              IN    DEVINSTID_A    pDeviceID, OPTIONAL
              IN    DWORD          ulFlags
              );

/*
* this function prototype for get CM_Reenumerate_DevNode function address
* how to use CM_Reenumerate_DevNode function, you may see about DDK Documentation
*/
typedef CONFIGRET (__stdcall *CM_Reenumerate_DevNode_FUNC) (
              IN    DEVINST   dnDevInst,
              IN    DWORD     ulFlags
              );

CM_LOCATE_DEVNODE_FUNC _Get_Locate_DevNode = NULL;
CM_Reenumerate_DevNode_FUNC _Get_Reenumerate_DevNode = NULL;

HINSTANCE handle;
DEVINST devInst;
CONFIGRET status;

handle = LoadLibrary("cfgmgr32.dll");
if ( handle == 0 ) {
printf("LoadLibrary failed!");
}

_Get_Locate_DevNode = (CM_LOCATE_DEVNODE_FUNC)GetProcAddress(handle, "CM_Locate_DevNodeW");
if ( _Get_Locate_DevNode != NULL ) {
  status = _Get_Locate_DevNode(&devInst, NULL, CM_LOCATE_DEVNODE_NORMAL);
  if ( status != CR_SUCCESS) {
   printf("_Get_Locate_DevNode failed!");
  }
}

_Get_Reenumerate_DevNode = (CM_Reenumerate_DevNode_FUNC)GetProcAddress(handle, "CM_Reenumerate_DevNode");
if ( _Get_Reenumerate_DevNode != NULL ) {
  status = _Get_Reenumerate_DevNode(devInst, 0);
  if ( status != CR_SUCCESS) {
   printf("_Get_Reenumerate_DevNode failed!");
  }
}

FreeLibrary(handle);