add processlist example

Author: hallazzang

examples/processlist/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/hallazzang/go-windows-programming/pkg/win"
+)
+
+type processInfo struct {
+	id        uint32
+	name      string
+	sessionID uint32
+}
+
+func processList() ([]processInfo, error) {
+	var pProcessInfo *win.WTS_PROCESS_INFO
+	var count uint32
+	var ps []processInfo
+	if win.WTSEnumerateProcesses(win.WTS_CURRENT_SERVER_HANDLE, 0, 1, &pProcessInfo, &count) == 0 {
+		return nil, win.GetLastError()
+	}
+	defer win.WTSFreeMemory(unsafe.Pointer(pProcessInfo))
+	size := unsafe.Sizeof(win.WTS_PROCESS_INFO{})
+	for i := uint32(0); i < count; i++ {
+		p := *(*win.WTS_PROCESS_INFO)(unsafe.Pointer(uintptr(unsafe.Pointer(pProcessInfo)) + uintptr(size)*uintptr(i)))
+		ps = append(ps, processInfo{
+			id:        p.ProcessId,
+			name:      win.UTF16PtrToString(p.PProcessName),
+			sessionID: p.SessionId,
+		})
+	}
+	return ps, nil
+}
+
+func main() {
+	ps, err := processList()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("process list:\n%+v\n", ps)
+}