gistfile1.go

func getImageNameFromHandle(processHandle syscall.Handle) (string, error) {
    h, err := syscall.LoadLibrary("Psapi.dll")
    if err != nil {
        return "", err
    }

    defer syscall.FreeLibrary(h)

    addr, err := syscall.GetProcAddress(h, "GetModuleFileNameExW")
    if err != nil {
        return "", err
    }

    buf := make([]uint16, 300)

    var syscallErr error
    r1, _, e1 := syscall.Syscall(addr, 3, uintptr(0), uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
    n := uint32(r1)
    if n == 0 {
        if e1 != 0 {
            syscallErr = error(e1)
        } else {
            syscallErr = syscall.EINVAL
        }
    }

    if syscallErr != nil {
        return "", syscallErr
    }

    return string(utf16.Decode(buf[0:n])), nil
}