如何利用vc实现删除U盘效果

Question

本人需要做一个程序，实现删除U盘这样的效果，哪位做过此功能的高手介绍下经验？U盘检测我已经实现了，就剩删除U盘功能了，想了很久都做不出来

Answer 1

如何用代码安全拔除U盘   
    
  include   <tchar.h>   
  #include   <stdio.h>   
  #include   <windows.h>   
  #include   <devguid.h>   
    
  #define   DWORD_PTR   DWORD   
  #define   ULONG_PTR   DWORD   
    
    
  extern   "C"   {     
  #include   "hidsdi.h"     
  }   
  //   需加入hid.lib   
    
  #include   <setupapi.h>   
  //   需加入setupapi.lib   
    
  #include   <regstr.h>   
  #include   <winbase.h>   
    
  #include   <cfgmgr32.h>   
  //   需要加入cfgmgr32.lib   
    
  #include   <initguid.h>   
  //#include   <usbiodef.h>   
  DEFINE_GUID(GUID_DEVINTERFACE_USB_DEVICE,   
      0xA5DCBF10L,   0x6530,   0x11D2,   0x90,   0x1F,   0x00,   0xC0,   0x4F,   0xB9,   0x51,   0xED);  
  #define   GUID_CLASS_USB_DEVICE                       GUID_DEVINTERFACE_USB_DEVICE   
    
  int   main(int   argc,   _TCHAR*   argv[])   
  {   
        HDEVINFO   hDevInfo;   
          
        SP_DEVINFO_DATA   DeviceInfoData;   
        DWORD   i;   
    
        //--------------------------------------------------------------------------   
        //   获取设备信息   
        hDevInfo   =   SetupDiGetClassDevs((LPGUID)&GUID_CLASS_USB_DEVICE,   
                0,   //   Enumerator   
                0,   
                DIGCF_PRESENT   |   DIGCF_DEVICEINTERFACE   );   
        if   (hDevInfo   ==   INVALID_HANDLE_VALUE)   {   
                //   查询信息失败   
                printf("ERROR   -   SetupDiGetClassDevs()");   
                return   1;   
        }   
        //--------------------------------------------------------------------------   
    
        //   枚举每个USB设备   
        DeviceInfoData.cbSize   =   sizeof(SP_DEVINFO_DATA);   
        for   (i=0;SetupDiEnumDeviceInfo(hDevInfo,   i,   &DeviceInfoData);i++)   
        {   
                  LPTSTR   buffer   =   NULL;   
                  PVOID   buffer2   =   NULL;   
                  DWORD   buffersize   =   0;   
                  ULONG   len;   
                  CONFIGRET       cr;   
                  PNP_VETO_TYPE   pnpvietotype;   
                  CHAR   vetoname[MAX_PATH];   
                  ULONG   ulStatus;   
                  ULONG   ulProblemNumber;   
    
                  cr   =   CM_Get_DevNode_Status(   &ulStatus,   
                                                                          &ulProblemNumber,   
                                                                          DeviceInfoData.DevInst,   
                                                                          0);   
                  if   (   CR_SUCCESS   ==   cr   )   {   
                          printf("OK   -   CM_Get_DevNode_Status()[%d]\n",   cr);   
                          printf("OK   -   CM_Get_DevNode_Status()   sts   [%x]\n",   ulStatus);   
                          printf("OK   -   CM_Get_DevNode_Status()   pro   [%x]\n",   ulProblemNumber);   
                  }   else   {   
                          printf("ERROR   -   CM_Get_DevNode_Status()[%d]\n",   cr);   
                          printf("ERROR   -   CM_Get_DevNode_Status()[%d]\n",   GetLastError());   
                  }   
                  //   DN_DISABLEABLE   or   DN_REMOVABLE   
                  if   ((DN_DISABLEABLE   &   ulStatus   )   !=   0   )   {   
                          printf("HAS   -   DN_DISABLEABLE()[%x]\n",   DN_DISABLEABLE   &   ulStatus);   
                  }   else   {   
                        continue;   
                  }   
                  if   ((DN_REMOVABLE   &   ulStatus   )   !=   0   )   {   
                          printf("HAS   -   DN_REMOVABLE()[%x]\n",   DN_REMOVABLE   &   ulStatus);   
                  }   else   {   
                        continue;   
                  }   
    
                  len   =   MAX_PATH;   
                  //   pnpvietotype   =   PNP_VetoDevice;     
                  cr   =   CM_Request_Device_Eject(   
                                                          DeviceInfoData.DevInst,   
                                                          &pnpvietotype,   
                                                          vetoname,   
                                                          len,   
                                                          0   
                                                          );   
                  if   (   CR_SUCCESS   ==   cr   )   {   
                          printf("OK   -   CM_Request_Device_Eject()[%d]\n",   cr);   
                  }   else   {   
                          printf("ERROR   -   CM_Request_Device_Eject()[%d]\n",   cr);   
                          printf("ERROR   -   CM_Request_Device_Eject()[%d]\n",   GetLastError());   
                  }   
    
        }   
                  
                  
        if   (   GetLastError()!=NO_ERROR   &&   
                  GetLastError()!=ERROR_NO_MORE_ITEMS   )   
        {   
                //   Insert   error   handling   here.   
                return   1;   
        }   
                  
        //     Cleanup   
        SetupDiDestroyDeviceInfoList(hDevInfo);   
    
        return   0;   
  }   

Answer 2

有三种方法，1和3都是未公开的API
1. CM_Request_Device_EjectA
http://www.withopf.com/tools/deveject/deveject-src-11.zip
2. DeviceIoControl calls with IOCTL_STORAGE_EJECT_MEDIA, FSCTL_DISMOUNT_VOLUME, etc
http://msdn.microsoft.com/en-us/library/aa940953%28WinEmbedded.5%29.aspx
3. CM_Query_And_Remove_SubTreeW
http://www.codeproject.com/KB/system/RemoveDriveByLetter.aspx

Answer 3

1和3都是公开的，MSDN和DDK都写得很详细。

Answer 4

请问2楼， "hidsdi.h"头文件上哪找？我搜索了整台电脑，都没有发现有这个文件 

Answer 5

问题解决了，从网上下载USB开发必要的库和头文件，加入到工程中，然后在命令行参数中输入盘符，利用2楼的代码就能实现U盘删除了