Add support for setupapi.SetupDiClassNameFromGuid()

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

setupapi/setupapi_windows.go

@@ -13,6 +13,7 @@ import (
 	"golang.org/x/sys/windows/registry"
 )
 
+//sys	setupDiClassNameFromGuid(ClassGUID *windows.GUID, ClassName *uint16, ClassNameSize uint32, RequiredSize *uint32) (err error) = setupapi.SetupDiClassNameFromGuidW
 //sys	setupDiGetClassDevsEx(ClassGUID *windows.GUID, Enumerator *uint16, hwndParent uintptr, Flags DIGCF, DeviceInfoSet DevInfo, MachineName *uint16, reserved uintptr) (handle DevInfo, err error) [failretval==DevInfo(windows.InvalidHandle)] = setupapi.SetupDiGetClassDevsExW
 //sys	SetupDiDestroyDeviceInfoList(DeviceInfoSet DevInfo) (err error) = setupapi.SetupDiDestroyDeviceInfoList
 //sys	setupDiGetDeviceInfoListDetail(DeviceInfoSet DevInfo, DeviceInfoSetDetailData *_SP_DEVINFO_LIST_DETAIL_DATA) (err error) = setupapi.SetupDiGetDeviceInfoListDetailW
@@ -24,6 +25,19 @@ import (
 //sys	SetupDiSetClassInstallParams(DeviceInfoSet DevInfo, DeviceInfoData *SP_DEVINFO_DATA, ClassInstallParams *SP_CLASSINSTALL_HEADER, ClassInstallParamsSize uint32) (err error) = setupapi.SetupDiSetClassInstallParamsW
 //sys	SetupDiCallClassInstaller(InstallFunction DI_FUNCTION, DeviceInfoSet DevInfo, DeviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiCallClassInstaller
 
+// SetupDiClassNameFromGuid function retrieves the class name associated with a class GUID.
+func SetupDiClassNameFromGuid(ClassGUID *windows.GUID) (ClassName string, err error) {
+	var _p0 [MAX_CLASS_NAME_LEN]uint16
+
+	err = setupDiClassNameFromGuid(ClassGUID, &_p0[0], MAX_CLASS_NAME_LEN, nil)
+	if err != nil {
+		return
+	}
+
+	ClassName = windows.UTF16ToString(_p0[:])
+	return
+}
+
 // SetupDiGetClassDevsEx function returns a handle to a device information set that contains requested device information elements for a local or a remote computer.
 func SetupDiGetClassDevsEx(ClassGUID *windows.GUID, Enumerator string, hwndParent uintptr, Flags DIGCF, DeviceInfoSet DevInfo, MachineName string) (handle DevInfo, err error) {
 	var _p0 *uint16

setupapi/setupapi_windows_test.go

@@ -6,6 +6,7 @@
 package setupapi
 
 import (
+	"strings"
 	"syscall"
 	"testing"
 
@@ -19,6 +20,24 @@ func init() {
 	computerName, _ = windows.ComputerName()
 }
 
+func TestSetupDiClassNameFromGuid(t *testing.T) {
+	className, err := SetupDiClassNameFromGuid(&deviceClassNetGUID)
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassNameFromGuid: %s", err.Error())
+	} else if strings.ToLower(className) != "net" {
+		t.Errorf("SetupDiClassNameFromGuid(%x) should return \"Net\"", deviceClassNetGUID)
+	}
+
+	_, err = SetupDiClassNameFromGuid(nil)
+	if err == nil {
+		t.Errorf("SetupDiClassNameFromGuid(nil) should fail")
+	} else {
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != 1784 /*ERROR_INVALID_USER_BUFFER*/ {
+			t.Errorf("SetupDiClassNameFromGuid(nil) should fail with ERROR_INVALID_USER_BUFFER")
+		}
+	}
+}
+
 func TestSetupDiGetClassDevsEx(t *testing.T) {
 	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "PCI", 0, DIGCF_PRESENT, DevInfo(0), computerName)
 	if err == nil {

setupapi/types_windows.go

@@ -9,6 +9,17 @@ import (
 	"golang.org/x/sys/windows"
 )
 
+const (
+	MAX_DEVICE_ID_LEN   = 200
+	MAX_DEVNODE_ID_LEN  = MAX_DEVICE_ID_LEN
+	MAX_GUID_STRING_LEN = 39 // 38 chars + terminator null
+	MAX_CLASS_NAME_LEN  = 32
+	MAX_PROFILE_LEN     = 80
+	MAX_CONFIG_VALUE    = 9999
+	MAX_INSTANCE_VALUE  = 9999
+	CONFIGMG_VERSION    = 0x0400
+)
+
 // DIGCF flags controll what is included in the device information set built by SetupDiGetClassDevs
 type DIGCF uint32
 

setupapi/zsetupapi_windows.go

@@ -39,6 +39,7 @@ func errnoErr(e syscall.Errno) error {
 var (
 	modsetupapi = windows.NewLazySystemDLL("setupapi.dll")
 
+	procSetupDiClassNameFromGuidW       = modsetupapi.NewProc("SetupDiClassNameFromGuidW")
 	procSetupDiGetClassDevsExW          = modsetupapi.NewProc("SetupDiGetClassDevsExW")
 	procSetupDiDestroyDeviceInfoList    = modsetupapi.NewProc("SetupDiDestroyDeviceInfoList")
 	procSetupDiGetDeviceInfoListDetailW = modsetupapi.NewProc("SetupDiGetDeviceInfoListDetailW")
@@ -51,6 +52,18 @@ var (
 	procSetupDiCallClassInstaller       = modsetupapi.NewProc("SetupDiCallClassInstaller")
 )
 
+func setupDiClassNameFromGuid(ClassGUID *windows.GUID, ClassName *uint16, ClassNameSize uint32, RequiredSize *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiClassNameFromGuidW.Addr(), 4, uintptr(unsafe.Pointer(ClassGUID)), uintptr(unsafe.Pointer(ClassName)), uintptr(ClassNameSize), uintptr(unsafe.Pointer(RequiredSize)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
 func setupDiGetClassDevsEx(ClassGUID *windows.GUID, Enumerator *uint16, hwndParent uintptr, Flags DIGCF, DeviceInfoSet DevInfo, MachineName *uint16, reserved uintptr) (handle DevInfo, err error) {
 	r0, _, e1 := syscall.Syscall9(procSetupDiGetClassDevsExW.Addr(), 7, uintptr(unsafe.Pointer(ClassGUID)), uintptr(unsafe.Pointer(Enumerator)), uintptr(hwndParent), uintptr(Flags), uintptr(DeviceInfoSet), uintptr(unsafe.Pointer(MachineName)), uintptr(reserved), 0, 0)
 	handle = DevInfo(r0)