update

kernel32.go

@@ -342,3 +342,23 @@ func GlobalSize(hMem HGLOBAL) (DWORD, error) {
 	}
 	return DWORD(r), nil
 }
+
+func GlobalAlloc(uFlags DWORD, dwBytes uintptr) (HGLOBAL, error) {
+	kernel32, err := syscall.LoadLibrary("kernel32.dll")
+	if err != nil {
+		return 0, err
+	}
+	defer syscall.FreeLibrary(kernel32)
+	ga, err := syscall.GetProcAddress(syscall.Handle(kernel32), "GlobalAlloc")
+	if err != nil {
+		return 0, err
+	}
+	r, _, errno := syscall.Syscall(ga, 2, uintptr(uFlags), dwBytes, 0)
+	if r == 0 {
+		if errno != 0 {
+			return 0, error(errno)
+		}
+		return 0, syscall.EINVAL
+	}
+	return HGLOBAL(r), nil
+}

kernel32typedef.go

@@ -113,3 +113,19 @@ type FILE_ID_DESCRIPTOR struct {
 	ObjectId       DWORDLONG
 	ExtendedFileId DWORDLONG
 }
+
+const (
+	GMEM_MOVEABLE       = 0x0002
+	GMEM_ZEROINIT       = 0x0040
+	GMEM_DDESHARE       = 0x2000
+	GMEM_SHARE          = GMEM_DDESHARE
+	GMEM_FIXED          = 0x0000
+	GMEM_DISCARDABLE    = 0x0100
+	GMEM_NOT_BANKED     = 0x1000
+	GMEM_NOTIFY         = 0x4000
+	GMEM_LOWER          = GMEM_NOT_BANKED
+	GMEM_VALID_FLAGS    = 0x7F72
+	GMEM_INVALID_HANDLE = 0x8000
+	GHND                = (GMEM_MOVEABLE | GMEM_ZEROINIT)
+	GPTR                = (GMEM_FIXED | GMEM_ZEROINIT)
+)

user32.go

@@ -322,6 +322,23 @@ func SetClipboardViewer(hWndNewViewer HWND) (HWND, error) {
 	return HWND(r), nil
 }
 
+func GetClipboardSequenceNumber() (DWORD, error) {
+	user32, err := syscall.LoadLibrary("user32.dll")
+	if err != nil {
+		return 0, errors.New("Can't Load User32 API")
+	}
+	defer syscall.FreeLibrary(user32)
+	gcsn, err := syscall.GetProcAddress(syscall.Handle(user32), "GetClipboardSequenceNumber")
+	if err != nil {
+		return 0, errors.New("Can't Load GetClipboardSequenceNumber API")
+	}
+	r, _, errno := syscall.Syscall(gcsn, 0, 0, 0, 0)
+	if r == 0 {
+		return 0, error(errno)
+	}
+	return DWORD(r), nil
+}
+
 func CreateWindowEx(dwExStyle DWORD, lpClassName, lpWindowName string, dwStyle DWORD, x, y, nWidth, nHeight int, hWndParent HWND, hMenu HMENU, hInstance HINSTANCE, lpParam unsafe.Pointer) (HWND, error) {
 	user32, err := syscall.LoadLibrary("user32.dll")
 	if err != nil {