How to chek if it is enough memory on USB stick

[koschka]

I am using libusb library. I got to work to check the program if a USB stick is detected to. That I have to find out is if there enough memory on USB stick. Does anyone have an idea how to do it. Are in this libusb library parameters which say how much memory does USb stick has total and how much in used?

 

[srizbf]

under which os?

 

[tpetar]

Open My Computer
Point mouse pointer on memory flash icon and wait 1 second data will show




Open My Computer,
find usb memory icon,
point on that icon,
right click on mouse
Click on Properties
General tab shows needed informations

 

[koschka]

Open My Computer
Point mouse pointer on memory flash icon and wait 1 second data will show




Open My Computer,
find usb memory icon,
point on that icon,
right click on mouse
Click on Properties
General tab shows needed informations

I have to check it in C++ using libusb library.

---------- Post added at 14:45 ---------- Previous post was at 14:45 ----------

in Windows XP

 

[tpetar]

Maybe this opensource addresses can help you :

libusbwin32_examples

 

[FvM]

An memory stick will be installed as mass storage device and handled by the OS file system, unless you block the installation somehow. It's accessible by generic C file functions and additional Windows SDK functions.

What do you want to do with libusb? Read raw sectors, decode the boot block and FAT to determine the free storage capacity?

 

[koschka]

with libusb I detected all USB devices connected to my computer. I used libusb_interface_descriptor to sort all devices which are equal LIBUSB_CLASS_MASS_STORAGE. So now I have only USB sticks connected. My problem I have to check out if some Bytes(for example 500KByte) fit on this USB stick. I have no idea how to check it. I know how to check it on my computer using Properties of USB but how to detect it by using coding I don't know.

 

[FvM]

How do you write to the memory stick after determing sufficient capacity? Isn't it by file functions?

If you don't access it as a removable disk (using file functions), you have to walk through the mass storage and file system layers in your code.

 

[srizbf]

use the win32 api function,

GetDiskFreeSpaceEx(....)

to know about the space from your c program.

 

[koschka]

I don't have to write. I just have to determin if some Bytes fit on this USB stick,nothing more.

---------- Post added at 15:28 ---------- Previous post was at 15:16 ----------

and by using libusb library can't I detect the free space on USB stick somehow?

 

[FvM]

by using libusb library can't I detect the free space on USB stick somehow?

I already mentioned how it works:
- read master boot sector and possibly logical drives boot sectors
- determine the file system (FAT16/FAT32) from the boot sector entries
- read all FAT sectors and calculate free space

 

[koschka]

I already mentioned how it works:
- read master boot sector and possibly logical drives boot sectors
- determine the file system (FAT16/FAT32) from the boot sector entries
- read all FAT sectors and calculate free space

tnx for your help, I will try to use the GetDiskFreeSpaceEx(....) method.