How to getdrive letter of the USB flash drive

Is it possible to know the Drive letter assigned the flash drive, after its plugged in, I know the vid/pid of the device, I just want to save some data to the flash drive, but need to know whats the drive letter, as it can be different on different machines.

Waz

anonymous
Mon May 31 03:26:02 CDT 2004

Hi

The following code will help

Kira

#define _WIN32_WINNT 0x050
#include <windows.h
#include <stdio.h
#include<cfgmgr32.h

#define BUFFER_SIZE MAX_PAT

struc

char letter
char *volume
} drives[26]
int count

void GetDeviceID(LPTSTR devID, DWORD size)
void GetAllRemovableDisks()
char CheckSpecificDrive(LPTSTR devID)

void GetAllRemovableDisks(

char drive[4]
drive[0] = 'A'
drive[1] = ':'
drive[2] = '\\'
drive[3] = 0

count = 0

DWORD driveMask = GetLogicalDrives()
for(int i=0; i<26; i++


BOOL b = (driveMask & 1)
if(b

drive[0] = 'A' + i
char volume[BUFFER_SIZE]
if(GetDriveType(drive) == DRIVE_REMOVABLE

if(GetVolumeNameForVolumeMountPoint(drive, volume, BUFFER_SIZE)

drives[count].letter = drive[0]
drives[count].volume = strdup(volume)
count ++




driveMask >>= 1


#include <winioctl.h
#include <setupapi.h
#pragma comment(lib, "setupapi.lib"

char CheckSpecificDrive(LPTSTR devID

//CONST GUID* guid =&GUID_DEVINTERFACE_CDROM
CONST GUID* guid = &GUID_DEVINTERFACE_VOLUME
TCHAR clsName[16]

DWORD required

HDEVINFO hDevInfo = SetupDiGetClassDevs(guid, NULL, NULL,
DIGCF_DEVICEINTERFACE | DIGCF_PRESENT)
if(hDevInfo == INVALID_HANDLE_VALUE
return 0

for(DWORD nIndex = 0; ;nIndex ++

SP_DEVICE_INTERFACE_DATA devInterfaceData
SP_DEVINFO_DATA devInfoData
PSP_DEVICE_INTERFACE_DETAIL_DATA pDevDetail
BYTE buffer[BUFFER_SIZE]
DWORD RequiredSize, dataType, required, err
TCHAR buf[60]
DEVINST devInstParent

ZeroMemory(&devInterfaceData, sizeof(devInterfaceData))
devInterfaceData.cbSize = sizeof(devInterfaceData)

devInfoData.cbSize = sizeof(devInfoData)

if(!SetupDiEnumDeviceInterfaces(hDevInfo, NULL, guid, nIndex,&devInterfaceData)

err = GetLastError()
break


ZeroMemory(&devInfoData, sizeof(devInfoData))
devInfoData.cbSize = sizeof(SP_DEVINFO_DATA)
pDevDetail = (PSP_DEVICE_INTERFACE_DETAIL_DATA)buffer
pDevDetail->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA)

SetupDiGetDeviceInterfaceDetail(hDevInfo, &devInterfaceData
pDevDetail, BUFFER_SIZE, &RequiredSize, &devInfoData)

CM_Get_Device_ID(devInfoData.DevInst, buf, sizeof(buf),0)
CM_Get_Parent(&devInstParent,devInfoData.DevInst, 0)
CM_Get_Device_ID(devInstParent, buf, sizeof(buf),0)
CM_Get_Parent(&devInstParent,devInstParent, 0)
CM_Get_Device_ID(devInstParent, buf, sizeof(buf),0)

if( buf != NULL && strcmp(devID,buf) == 0

int len = strlen(pDevDetail->DevicePath)
pDevDetail->DevicePath[len] = '\\'
pDevDetail->DevicePath[len+1] = 0

char volume[BUFFER_SIZE]
if(GetVolumeNameForVolumeMountPoint(pDevDetail->DevicePath, volume,
BUFFER_SIZE)

for(int i=0; i<count; i++

if(strcmp(drives[i].volume, volume)==0

return drives[i].letter



}


SetupDiDestroyDeviceInfoList(hDevInfo)


void main(

LPTSTR devID
BYTE buf[60]
devID = (LPTSTR)buf
TCHAR drive
LPTSTR lpDirectory
DWORD size = 60
TCHAR drivePath[6]
DWORD err

lpDirectory =(LPTSTR)LocalAlloc(LPTR, BUFFER_SIZE)

GetAllRemovableDisks()
// Get USB\VID_xxxx\PID_xxxx to devID
drive = CheckSpecificDrive(devID)

sprintf(drivePath, "%c:\\",drive)
sprintf(lpDirectory,"%sTest",drivePath)
CreateDirectoryEx(drivePath, lpDirectory, NULL)
err = GetLastError()
printf(" Drive corresponding to %s is %c\n", devID, drive)