Windows下两种方法弹出U盘

1. 通过设置IOCTL_STORAGE_EJECT_MEDIA

通过CreateFile打开指定盘符的U盘获取设备句柄hDevice
通过DeviceIoControl(hDevice,FSCTL_DISMOUNT_VOLUME…)强制关闭其他进程对设备的占用
通过DeviceIoControl(hDevice,FSCTL_LOCK_VOLUME…)对设备进行加锁，防止其他进程干扰
通过DeviceIoControl(hDevice,IOCTL_STORAGE_MEDIA_REMOVAL…)来禁用阻止删除多媒体设备功能
通过DeviceIoControl(hDevice,IOCTL_STORAGE_EJECT_MEDIA…)来弹出设备。
注意，此方法只是从文件浏览页面删除盘符，并不是真的弹出了设备

static int EjectLogDisk(const char *discId)
{DWORD accessMode = GENERIC_WRITE | GENERIC_READ;DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;HANDLE hDevice;long bResult = 0;DWORD retu = 0;DWORD dwError;DWORD dwBytesReturned;DWORD dwSleepAmount;int nTryCount;char szDriv[10];if(discId == NULL){return 0;}dwSleepAmount = LOCK_TIMEOUT/LOCK_RETRIES;sprintf(szDriv,"\\\\.\\%s:",discId);hDevice = CreateFile(szDriv,accessMode,shareMode,NULL,OPEN_EXISTING,0,NULL);if(hDevice == INVALID_HANDLE_VALUE){printf("uninstallusb createfile failed error:%d\n",GetLastError());return -1;}
#if 1//卸载U盘卷，不论是否在使用dwBytesReturned = 0;if(!DeviceIoControl(hDevice,FSCTL_DISMOUNT_VOLUME,NULL,0,NULL,0,&dwBytesReturned,NULL)){printf("deviceIoConrol FSCTL_DISMOUNT_VOLUME failed\n");}//此循环是用于锁定要弹出的U盘设备，如果U盘在使用，则循环等待// Do this in a loop until a timeout period has expiredfor(nTryCount = 0;nTryCount < LOCK_RETRIES;nTryCount++){if(DeviceIoControl(hDevice,FSCTL_LOCK_VOLUME,NULL,0,NULL,0,&dwBytesReturned,NULL)){break;}}
#endifdwBytesReturned = 0;PREVENT_MEDIA_REMOVAL PMRBuffer;PMRBuffer.PreventMediaRemoval = FALSE;if(!DeviceIoControl(hDevice,IOCTL_STORAGE_MEDIA_REMOVAL,&PMRBuffer,sizeof(PREVENT_MEDIA_REMOVAL),NULL,0,&dwBytesReturned,NULL)){printf("DeviceIoControl IOCTL_STORAGE_MEDIA_REMOVAL failed:%d\n",GetLastError());}bResult = DeviceIoControl(hDevice,IOCTL_STORAGE_EJECT_MEDIA,NULL,0,NULL,0,&retu,NULL);if(!bResult){CloseHandle(hDevice);printf("uninstallusb DeviceIoControl failed error:%d\n",GetLastError());return -1;}CloseHandle(hDevice);return 0;
}

2. 通过设置CM_Request_Device_Eject

此方法的作用与从右下角托盘中安全删除并弹出媒体的功能一致，设置之后，设备的错误码为47。并且设备只能通过断上电重新接入电脑才可用。

#include <winioctl.h>
#include "setupapi.h"
#include "cfgmgr32.h"
#pragma comment(lib,"setupapi.lib")  DEVINST GetDrivesDevInstByDiskNumber(long DiskNumber)
{GUID* guid = (GUID*)(void*)&GUID_DEVINTERFACE_DISK;// Get device interface info set handle for all devices attached to systemHDEVINFO hDevInfo = SetupDiGetClassDevs(guid, NULL, NULL,DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);if (hDevInfo == INVALID_HANDLE_VALUE){return 0;}// Retrieve a context structure for a device interface of a device// information set.DWORD dwIndex = 0;SP_DEVICE_INTERFACE_DATA devInterfaceData = {0};devInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);BOOL bRet = FALSE;PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd;SP_DEVICE_INTERFACE_DATA spdid;SP_DEVINFO_DATA spdd;DWORD dwSize;spdid.cbSize = sizeof(spdid);while ( true ){bRet = SetupDiEnumDeviceInterfaces(hDevInfo, NULL, guid, dwIndex,&devInterfaceData);if (!bRet){break;}SetupDiEnumInterfaceDevice(hDevInfo, NULL, guid, dwIndex, &spdid);dwSize = 0;SetupDiGetDeviceInterfaceDetail(hDevInfo, &spdid, NULL, 0, &dwSize,NULL);if ( dwSize ){pspdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY, dwSize);if ( pspdidd == NULL ) {continue; // autsch}pspdidd->cbSize = sizeof(*pspdidd);ZeroMemory((PVOID)&spdd, sizeof(spdd));spdd.cbSize = sizeof(spdd);long res = SetupDiGetDeviceInterfaceDetail(hDevInfo, &spdid,pspdidd, dwSize, &dwSize, &spdd);if ( res ){HANDLE hDrive = CreateFile(pspdidd->DevicePath, 0,FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);if ( hDrive != INVALID_HANDLE_VALUE ){STORAGE_DEVICE_NUMBER sdn;DWORD dwBytesReturned = 0;res = DeviceIoControl(hDrive, IOCTL_STORAGE_GET_DEVICE_NUMBER,NULL, 0, &sdn, sizeof(sdn), &dwBytesReturned, NULL);if ( res ) {if ( DiskNumber == (long)sdn.DeviceNumber ){CloseHandle(hDrive);SetupDiDestroyDeviceInfoList(hDevInfo);return spdd.DevInst;}}CloseHandle(hDrive);}}HeapFree(GetProcessHeap(), 0, pspdidd);}dwIndex++;}SetupDiDestroyDeviceInfoList(hDevInfo);return 0;
}static int EjectUSBDisk(char *discId)
{DWORD accessMode = GENERIC_WRITE | GENERIC_READ;DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;HANDLE hDevice;long bResult = 0;DWORD retu = 0;DWORD dwError;DWORD dwBytesReturned;int nTryCount;char szDriv[10];if(discId == NULL){return 0;}sprintf(szDriv,"\\\\.\\%s:",discId);hDevice = CreateFile(szDriv,accessMode,shareMode,NULL,OPEN_EXISTING,0,NULL);if(hDevice == INVALID_HANDLE_VALUE){printf("uninstallusb createfile failed error:%d\n",GetLastError());return -1;}//使用CM_Request_Device_Eject弹出USB设备STORAGE_DEVICE_NUMBER sdn;long DiskNumber = -1;long res = DeviceIoControl(hDevice,IOCTL_STORAGE_GET_DEVICE_NUMBER,NULL,0,&sdn,sizeof(sdn),&dwBytesReturned,NULL);if(!res){printf("DeviceIoControl IOCTL_STORAGE_GET_DEVICE_NUMBER failed:%d\n",GetLastError());CloseHandle(hDevice);return -1;}CloseHandle(hDevice);DiskNumber = sdn.DeviceNumber;if(DiskNumber == -1){printf("DiskNumber == -1\n");return -1;}DEVINST DevInst = GetDrivesDevInstByDiskNumber(DiskNumber);if(DevInst == 0){printf("GetDrivesDevInstDiskNumber failed\n");return -1;}ULONG Status = 0;ULONG ProblemNumber = 0;PNP_VETO_TYPE VetoType = PNP_VetoTypeUnknown;char VetoName[MAX_PATH];bool bSuccess = false;res = CM_Get_Parent(&DevInst,DevInst,0); //disk's parent, e.g. the USB bridge, the SATA controller....res = CM_Get_DevNode_Status(&Status,&ProblemNumber,DevInst,0);bool IsRemovable = ((Status & DN_REMOVABLE) != 0);printf("isremovable:%d\n",IsRemovable);long i;// try 3 timesfor(i = 0;i < 3;i++){VetoName[0] = '\0';if(IsRemovable){res = CM_Request_Device_Eject(DevInst,&VetoType,VetoName,MAX_PATH,0);}else{res = CM_Query_And_Remove_SubTree(DevInst,&VetoType,VetoName,MAX_PATH,0);}bSuccess = (res == CR_SUCCESS && VetoName[0] == '\0');if(bSuccess){break;}else{Sleep(200);}}if(bSuccess){printf("Success\n\n");}else{printf("failed\n");}return 0;
}

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Windows下两种方法弹出U盘

1. 通过设置IOCTL_STORAGE_EJECT_MEDIA

2. 通过设置CM_Request_Device_Eject

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