请各位大侠指教,在usb硬盘加载后,如何区分并判断系统中的usb硬盘和本地硬盘?
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- 简单问题
返回DRIVE_REMOVABLE表示G:盘是可移动磁盘
如果你有软件驱A,B盘也会一样返回DRIVE_REMOVABLE
一般来说可移动磁盘就是U盘!
在u盘插入的时候,系统会将产生的盘符信息通过消息
传递给向系统注册过响应该usb设备的窗体
我用活动硬盘进行测试,可以判断它的插入或者拔出。试一下吧!// CheckUsb.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "Dbt.h"
void DeviceChangeEventOpt(WPARAM wParam, LPARAM lParam)
{
switch(wParam)
{
case DBT_CONFIGCHANGECANCELED:
MessageBox(NULL,"设备改变DBT_CONFIGCHANGECANCELED","提示",MB_OK);
break;
case DBT_CONFIGCHANGED:
MessageBox(NULL,"设备改变DBT_CONFIGCHANGED","提示",MB_OK);
break;
case DBT_CUSTOMEVENT:
MessageBox(NULL,"设备改变DBT_CUSTOMEVENT","提示",MB_OK);
break;
case DBT_DEVICEARRIVAL: // A device has been inserted and is now available.
MessageBox(NULL,"设备改变DBT_DEVICEARRIVAL","提示",MB_OK);
DEV_BROADCAST_HDR *stHDR;
stHDR = (DEV_BROADCAST_HDR *)lParam; //判断设备类型
switch(stHDR->dbch_devicetype)
{
case DBT_DEVTYP_DEVICEINTERFACE:
MessageBox(NULL,"设备类型 DBT_DEVTYP_DEVICEINTERFACE","提示",MB_OK);
break;
case DBT_DEVTYP_HANDLE:
MessageBox(NULL,"设备类型 DBT_DEVTYP_HANDLE","提示",MB_OK);
break;
case DBT_DEVTYP_OEM:
MessageBox(NULL,"设备类型 DBT_DEVTYP_OEM","提示",MB_OK);
break;
case DBT_DEVTYP_PORT:
MessageBox(NULL,"设备类型 DBT_DEVTYP_PORT","提示",MB_OK);
break;
case DBT_DEVTYP_VOLUME:// Logical volume. This structure is a DEV_BROADCAST_VOLUME structure
MessageBox(NULL,"设备类型 DBT_DEVTYP_VOLUME","提示",MB_OK);
break;
}
//
break;
case DBT_DEVICEQUERYREMOVE:
MessageBox(NULL,"设备改变DBT_DEVICEQUERYREMOVE","提示",MB_OK);
break;
case DBT_DEVICEQUERYREMOVEFAILED:
MessageBox(NULL,"设备改变DBT_DEVICEQUERYREMOVEFAILED","提示",MB_OK);
break;
case DBT_DEVICEREMOVECOMPLETE:// A device has been removed.
MessageBox(NULL,"设备改变DBT_DEVICEREMOVECOMPLETE","提示",MB_OK);
break;
case DBT_DEVICEREMOVEPENDING://
MessageBox(NULL,"设备改变DBT_DEVICEREMOVEPENDING","提示",MB_OK);
break;
case DBT_DEVICETYPESPECIFIC://
MessageBox(NULL,"设备改变DBT_DEVICETYPESPECIFIC","提示",MB_OK);
break;
case DBT_QUERYCHANGECONFIG:
MessageBox(NULL,"设备改变DBT_QUERYCHANGECONFIG","提示",MB_OK);
break;
case DBT_USERDEFINED ://
MessageBox(NULL,"设备改变DBT_USERDEFINED","提示",MB_OK);
break;
}
}HWND hwndMain;
LRESULT CALLBACK WndProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
)
{
switch(uMsg)
{
case WM_CREATE:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
break;
case WM_DEVICECHANGE:
DeviceChangeEventOpt(wParam,lParam);
break;
}
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
WNDCLASSEX wclass;
MSG msg;
wclass.cbClsExtra = 0;
wclass.cbSize = sizeof(WNDCLASSEX);
wclass.cbWndExtra = 0;
wclass.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
wclass.hCursor = NULL;
wclass.hIcon = NULL;
wclass.hIconSm = NULL;
wclass.hInstance = hInstance;
wclass.lpfnWndProc =(WNDPROC)WndProc;
wclass.lpszClassName = "CheckUSB";
wclass.lpszMenuName = NULL;
wclass.style = CS_DBLCLKS;
if(!RegisterClassEx(&wclass))
{
MessageBox(NULL,"类创建失败","类创建失败",MB_OK);
}
hwndMain = CreateWindow("CheckUSB","检测USB设备",
WS_OVERLAPPED | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 320, 300,NULL, NULL, hInstance, NULL);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg); //translate the message into its char equivelent
DispatchMessage(&msg);
}
return msg.wParam;
}
DBT_DEVTYP_VOLUME
所以
当它插入硬盘以后,它的盘符信息保存在以下结构中
typedef struct _DEV_BROADCAST_VOLUME {
DWORD dbcv_size;
DWORD dbcv_devicetype;
DWORD dbcv_reserved;
DWORD dbcv_unitmask;
WORD dbcv_flags;
} DEV_BROADCAST_VOLUME;dbcv_unitmask里就是它的盘符
A logical unit mask identifying one or more logical units. Each bit in the mask corresponds to one logical drive. Bit 0 represents drive A, bit 1 represents drive B, and so on