USB设备插入/拔出时重要的windows消息值

设备变更时,会收到WM_DEVICECHANGE消息

public const int WM_DEVICECHANGE = 0x219;

在收到WM_DEVICECHANGE消息,判断wordparm的值对比下面的常量,判断具体操作

public const int DBT_DEVICEARRIVAL = 0x8000;

public const int DBT_CONFIGCHANGECANCELED = 0x0019;

public const int DBT_CONFIGCHANGED = 0x0018;

public const int DBT_CUSTOMEVENT = 0x8006;

public const int DBT_DEVICEQUERYREMOVE = 0x8001;

public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;

public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;

public const int DBT_DEVICEREMOVEPENDING = 0x8003;

public const int DBT_DEVICETYPESPECIFIC = 0x8005;

public const int DBT_DEVNODES_CHANGED = 0x0007;

public const int DBT_QUERYCHANGECONFIG = 0x0017;

public const int DBT_USERDEFINED = 0xFFFF;