how to get volume serial number

Question

I am trying to get volume serial number with winapi in c++

I have the following code:

DWORD VolumeSerialNumber=0; 
GetVolumeInformation(L"c:\\", NULL, NULL, &VolumeSerialNumber, NULL, NULL, NULL, NULL);

it works fine and returns VolumeSerialNumber=571477456 but in cmd, when i use dir I get:

C:\Users\User>dir
 Volume in drive C is Windows
 Volume Serial Number is 2210-0DD0

how do i convert 571477456 to 2210-0DD0 ?

Answer 1

You just need to print the value in hex instead of decimal, using the %X format specifier:

printf("VolumeSerialNumber: 0x%X\n", VolumeSerialNumber);

Which will output:

0x22100dd0

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If you really require the exact same output, you can separate the DWORD into its lower and upper WORDS using the LOWORD and HIWORD macros:

printf("Volume Serial Number is %04X-%04X\n",
    HIWORD(VolumeSerialNumber),
    LOWORD(VolumeSerialNumber));

Which will output:

Volume Serial Number is 2210-0DD0