好奇怪哦,调用CM_Request_Device_Eject就是编译不过,真不知道为什么?库已经加了,在当前目录下.

Question

两个函数CM_Get_DevNode_Status和CM_Request_Device_Eject都在cfgmgr32.h中被定义,编译时都要Link cfgmgr32.lib,调用CM_Get_DevNode_Status可以通过,而调用
CM_Request_Device_Eject就是link不过,真是见鬼了.
出错及代码如下:
--------------------Configuration: MoveUsbDevice - Win32 Release--------------------
Compiling...
move.cpp
Linking...
move.obj : error LNK2001: unresolved external symbol __imp__CM_Request_Device_EjectA@20
Release/MoveUsbDevice.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Creating browse info file...MoveUsbDevice.exe - 2 error(s), 0 warning(s)#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>#pragma comment(lib,"hid.lib")
#pragma comment(lib,"setupapi.lib")
#pragma comment(lib,"cfgmgr32.lib")
  
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];  
 //  LPWSTR  vetoname=NULL;
               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;  
   CM_Request_Device_EjectW(
            IN  DEVINST         dnDevInst,
            OUT PPNP_VETO_TYPE  pVetoType,
            OUT LPWSTR          pszVetoName,
            IN  ULONG           ulNameLength,
            IN  ULONG           ulFlags
            );  CMAPI CONFIGRET WINAPI
  CM_Request_Device_Eject_Ex(
    IN DEVINST  dnDevInst,
    OUT PPNP_VETO_TYPE  pVetoType,
    OUT LPTSTR  pszVetoName,
    IN ULONG  ulNameLength,
    IN ULONG  ulFlags
    IN HMACHINE  hMachine
    );
CMAPI CONFIGRET WINAPI
  CM_Request_Device_Eject(
    IN DEVINST  dnDevInst,
    OUT PPNP_VETO_TYPE  pVetoType,
    OUT LPTSTR  pszVetoName,
    IN ULONG  ulNameLength,
    IN ULONG  ulFlags
    );
*/
              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());  
               }

Answer 1

我已经加了啊.
#pragma comment(lib,"hid.lib")
#pragma comment(lib,"setupapi.lib")
#pragma comment(lib,"cfgmgr32.lib")
真不知道为什么啊?
大侠麻烦再帮看看,行吗?

Answer 2

在setting中加入试试看,你是在做hotplug?

Answer 3

CM_Request_Device_Eject是setupapi.dll中的接口

Answer 4

实在不行的话，只能用LoadLibrary，GetProcAddress了

Answer 5

你的lib是不是最新的?会不会是版本的问题?用sdk的试试看

Answer 6

直接load dll ,呵呵
pfnHotPlugEjectDevice HotPlugEjectDevice = NULL; HMODULE hHotPlug = LoadLibrary("HotPlug.dll");
if(hHotPlug == NULL) 
{
printf("LoadLibrary(HotPlug.dll) Error:%d\n", GetLastError());
return FALSE;
}

//get functions
HotPlugEjectDevice = (pfnHotPlugEjectDevice)GetProcAddress(hHotPlug, "HotPlugEjectDevice");

BOOL bResult = HotPlugEjectDevice(NULL, "USB\\Vid_0d7d&Pid_0150\\4D3B190303C0");

Answer 7

非常感谢各位的解答.
的确是版本的问题,我将路径改为winxp ddk的路径就可以了,vc目录下的不行.
不知它们有什么区别呢?

Answer 8

原来的是老版本的东西,还不包含这个接口.
所以你在release出去的时候,要连setupapi.dll一起发出去,不然会找不到接口