host: use wmic OS instead of calling GetTickCount on Windows.

README.rst

@@ -128,7 +128,7 @@ Current Status
 
 ================= ====== ======= ====== =======
 name              Linux  FreeBSD MacOSX Windows
-cpu_times            x      x
+cpu_times            x      x              x
 cpu_count            x      x      x       x
 cpu_percent          x      x              x
 cpu_times_percent    x      x              x
@@ -138,7 +138,7 @@ disk_partitions      x      x      x       x
 disk_io_counters     x
 disk_usage           x      x      x       x
 net_io_counters      x      x      b       x
-boot_time            x      x      x       b
+boot_time            x      x      x       x
 users                x      x      x       x
 pids                 x      x      x       x
 pid_exists           x      x      x       x
@@ -202,14 +202,14 @@ hostname              x     x      x       x
   platformfamiliy     x     x      x
   virtualization      x
 **CPU**       
-  VendorID            x     x      x
-  Family              x     x      x
-  Model               x     x      x
-  Stepping            x     x      x
+  VendorID            x     x      x       x
+  Family              x     x      x       x
+  Model               x     x      x       x
+  Stepping            x     x      x       x
   PhysicalID          x
   CoreID              x
-  Cores               x
-  ModelName           x     x      x
+  Cores               x                    x
+  ModelName           x     x      x       x
 **LoadAvg**              
   Load1               x     x      x
   Load5               x     x      x

host/host_windows.go

@@ -3,9 +3,10 @@
 package host
 
 import (
+	"fmt"
 	"os"
-	"syscall"
-	"unsafe"
+	"strings"
+	"time"
 
 	common "github.com/shirou/gopsutil/common"
 	process "github.com/shirou/gopsutil/process"
@@ -13,7 +14,6 @@ import (
 
 var (
 	procGetSystemTimeAsFileTime = common.Modkernel32.NewProc("GetSystemTimeAsFileTime")
-	procGetTickCount            = common.Modkernel32.NewProc("GetTickCount")
 )
 
 func HostInfo() (*HostInfoStat, error) {
@@ -24,13 +24,11 @@ func HostInfo() (*HostInfoStat, error) {
 	}
 
 	ret.Hostname = hostname
-	uptimemsec, _, err := procGetTickCount.Call()
-	if uptimemsec == 0 {
-		return ret, syscall.GetLastError()
+	uptime, err := BootTime()
+	if err == nil {
+		ret.Uptime = uptime
 	}
 
-	ret.Uptime = uint64(uptimemsec) / 1000
-
 	procs, err := process.Pids()
 	if err != nil {
 		return ret, err
@@ -42,25 +40,26 @@ func HostInfo() (*HostInfoStat, error) {
 }
 
 func BootTime() (uint64, error) {
-	var lpSystemTimeAsFileTime common.FILETIME
-
-	r, _, _ := procGetSystemTimeAsFileTime.Call(uintptr(unsafe.Pointer(&lpSystemTimeAsFileTime)))
-	if r == 0 {
-		return 0, syscall.GetLastError()
+	lines, err := common.GetWmic("os", "LastBootUpTime")
+	if err != nil {
+		return 0, err
+	}
+	if len(lines) == 0 || lines[0] == "" {
+		return 0, fmt.Errorf("could not get LastBootUpTime")
+	}
+	l := strings.Split(lines[0], ",")
+	if len(l) != 2 {
+		return 0, fmt.Errorf("could not parse LastBootUpTime")
+	}
+	format := "20060102150405"
+	t, err := time.Parse(format, strings.Split(l[1], ".")[0])
+	if err != nil {
+		return 0, err
+	}
+	now := time.Now()
+	return uint64(now.Sub(t).Seconds()), nil
 }
 
-	// TODO: This calc is wrong.
-	ll := (uint32(lpSystemTimeAsFileTime.DwHighDateTime))<<32 + lpSystemTimeAsFileTime.DwLowDateTime
-	pt := (uint64(ll) - 116444736000000000) / 10000000
-
-	u, _, _ := procGetTickCount.Call()
-	if u == 0 {
-		return 0, syscall.GetLastError()
-	}
-	uptime := uint64(u) / 1000
-
-	return uint64(pt - uptime), nil
-}
 func Users() ([]UserStat, error) {
 
 	var ret []UserStat