How to Get the Total Size of a Windows Drive in Go?

Retrieving the Total Size of a Drive in Go on Windows

In previous efforts, you successfully determined the free space available on a drive. Building on this knowledge, you now seek to retrieve the total size of a specific drive, such as "C:."

To address this request, the GetDiskFreeSpaceExW() Windows API function from the kernel32.dll can be employed. This function requires an in-parameter (the drive path) and provides three out-parameters:

• Free bytes available to the caller
• Total number of bytes (disk size)
• Total number of free bytes

By allocating variables for the information you wish to obtain, you can utilize the GetDiskFreeSpaceExW() function. Here's an example implementation:

import (
    "syscall"
    "unsafe"
    "fmt"
)

func main() {
    kernelDLL, err := syscall.LoadDLL("kernel32.dll")
    if err != nil {
        panic(err)
    }

    getDiskFreeSpaceExW, err := kernelDLL.FindProc("GetDiskFreeSpaceExW")
    if err != nil {
        panic(err)
    }
    
    var free, total, avail int64

    path := "c:\"
    r1, r2, lastErr := getDiskFreeSpaceExW.Call(
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
        uintptr(unsafe.Pointer(&free)),
        uintptr(unsafe.Pointer(&total)),
        uintptr(unsafe.Pointer(&avail)),
    )

    fmt.Println(r1, r2, lastErr)
    fmt.Println("Free:", free, "Total:", total, "Available:", avail)
}

Running this code yields output such as:

1 0 Success.
Free: 16795295744 Total: 145545281536 Available: 16795295744

This information provides a comprehensive view of the disk usage and capacity.

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