Finish support for setupapi.SetupDiGetClassDevsEx()

Signed-off-by: Simon Rozman <simon@rozman.si>

setupapi/setupapi_windows_test.go

@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"syscall"
+	"testing"
+
+	"golang.org/x/sys/windows"
+)
+
+func TestSetupDiGetClassDevsEx(t *testing.T) {
+	guidDeviceClassNet := windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
+
+	compName, err := windows.ComputerName()
+	if err != nil {
+		t.Errorf("Error getting computer name: %s", err.Error())
+	}
+
+	dev_info_list, err := SetupDiGetClassDevsEx(&guidDeviceClassNet, "PCI", 0, DIGCF_PRESENT, DevInfo(0), compName)
+	if err == nil {
+		dev_info_list.Close()
+	} else {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+
+	dev_info_list, err = SetupDiGetClassDevsEx(nil, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err == nil {
+		dev_info_list.Close()
+		t.Errorf("SetupDiGetClassDevsEx(nil, ...) should fail")
+	} else {
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != 87 /*ERROR_INVALID_PARAMETER*/ {
+			t.Errorf("SetupDiGetClassDevsEx(nil, ...) should fail with ERROR_INVALID_PARAMETER")
+		}
+	}
+}