diff --git a/advapi32.go b/advapi32.go
index 31088ca..365521e 100644
--- a/advapi32.go
+++ b/advapi32.go
@@ -21,10 +21,10 @@ func DuplicateTokenEx(hExistingToken HANDLE, dwDesiredAccess DWORD,
 	if err != nil {
 		return errors.New("Can't Load WTSQueryUserToken API")
 	}
-	r, _, err := syscall.Syscall6(uintptr(Dup), 6, uintptr(hExistingToken), uintptr(dwDesiredAccess), lpTokenAttributes, uintptr(ImpersonationLevel),
+	r, _, errno := syscall.Syscall6(uintptr(Dup), 6, uintptr(hExistingToken), uintptr(dwDesiredAccess), lpTokenAttributes, uintptr(ImpersonationLevel),
 		uintptr(TokenType), uintptr(unsafe.Pointer(phNewToken)))
 	if r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }
@@ -52,11 +52,11 @@ func CreateProcessAsUser(hToken TOKEN, lpApplicationName, lpCommandLine string,
 	if len(lpCurrentDirectory) > 0 {
 		workingDir = uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpCurrentDirectory)))
 	}
-	r, _, err := syscall.Syscall12(uintptr(CPAU), 11, uintptr(hToken), uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpApplicationName))),
+	r, _, errno := syscall.Syscall12(uintptr(CPAU), 11, uintptr(hToken), uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpApplicationName))),
 		commandLine, lpProcessAttributes, lpThreadAttributes, bInheritHandles, uintptr(dwCreationFlags), uintptr(lpEnvironment),
 		workingDir, uintptr(unsafe.Pointer(lpStartupInfo)), uintptr(unsafe.Pointer(lpProcessInformation)), 0)
 	if r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }
@@ -71,9 +71,9 @@ func GetTokenInformation(TokenHandle HANDLE, TokenInformationClass, TokenInforma
 	if err != nil {
 		return errors.New("Can't Load GetTokenInformation API")
 	}
-	if r, _, err := syscall.Syscall6(uintptr(GTI), 5, uintptr(TokenHandle), TokenInformationClass,
+	if r, _, errno := syscall.Syscall6(uintptr(GTI), 5, uintptr(TokenHandle), TokenInformationClass,
 		TokenInformation, TokenInformationLength, uintptr(unsafe.Pointer(ReturnLength)), 0); r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }
diff --git a/kernel32.go b/kernel32.go
index c72d59d..de8064b 100644
--- a/kernel32.go
+++ b/kernel32.go
@@ -30,8 +30,8 @@ func CloseHandle(hObject HANDLE) error {
 	if err != nil {
 		return errors.New("Can't Load CloseHandle API")
 	}
-	if r, _, err := syscall.Syscall(uintptr(CH), 1, uintptr(hObject), 0, 0); r == 0 {
-		return err
+	if r, _, errno := syscall.Syscall(uintptr(CH), 1, uintptr(hObject), 0, 0); r == 0 {
+		return error(errno)
 	}
 	return nil
 }
@@ -46,9 +46,9 @@ func CreateToolhelp32Snapshot(dwFlags, th32ProcessID DWORD) (HANDLE, error) {
 	if err != nil {
 		return 0, errors.New("Can't Load CreateToolhelp32Snapshot API")
 	}
-	r, _, err := syscall.Syscall(uintptr(CTS), 2, uintptr(dwFlags), uintptr(th32ProcessID), 0)
+	r, _, errno := syscall.Syscall(uintptr(CTS), 2, uintptr(dwFlags), uintptr(th32ProcessID), 0)
 	if int(r) == -1 {
-		return 0, err
+		return 0, error(errno)
 	}
 	return HANDLE(r), nil
 }
@@ -63,9 +63,12 @@ func Process32Next(hSnapshot HANDLE, lppe *PROCESSENTRY32) error {
 	if err != nil {
 		return errors.New("Can't Load Process32Next API")
 	}
-	r, _, err := syscall.Syscall(uintptr(PN), 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lppe)), 0)
-	if int(r) != 1 {
-		return err
+	r, _, errno := syscall.Syscall(uintptr(PN), 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lppe)), 0)
+	if r == 0 {
+		if errno != 0 {
+			return error(errno)
+		}
+		return syscall.EINVAL
 	}
 	return nil
 }
@@ -109,10 +112,63 @@ func GlobalMemoryStatusEx(data *MEMORYSTATUSEX) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	r, _, err := syscall.Syscall(uintptr(GMS), 1, uintptr(unsafe.Pointer(data)), 0, 0)
+	r, _, errno := syscall.Syscall(uintptr(GMS), 1, uintptr(unsafe.Pointer(data)), 0, 0)
 	if r == 0 {
+		if errno != 0 {
+			return false, error(errno)
+		}
+		return false, syscall.EINVAL
+	}
+	return true, nil
+}
+
+func LockFileEx(hFile HANDLE, dwFlags DWORD, dwReserved DWORD, nNumberOfBytesToLockLow DWORD,
+	nNumberOfBytesToLockHigh DWORD, lpOverlapped *syscall.Overlapped) (bool, error) {
+	kernel32, err := syscall.LoadLibrary("kernel32.dll")
+	if err != nil {
 		return false, err
-	} else {
-		return true, nil
 	}
+	defer syscall.FreeLibrary(kernel32)
+	Lck, err := syscall.GetProcAddress(syscall.Handle(kernel32), "LockFileEx")
+	if err != nil {
+		return false, err
+	}
+	r, _, errno := syscall.Syscall6(uintptr(Lck), 6, uintptr(hFile), uintptr(dwFlags), uintptr(dwReserved),
+		uintptr(nNumberOfBytesToLockLow), uintptr(nNumberOfBytesToLockHigh), uintptr(unsafe.Pointer(lpOverlapped)))
+	if r == 0 {
+		if errno != 0 {
+			return false, error(errno)
+		}
+		return false, syscall.EINVAL
+	}
+	return true, nil
+}
+
+func CreateEventW(lpEventAttributes *syscall.SecurityAttributes, bManualReset bool,
+	bInitialState bool, lpName LPCWSTR) (HANDLE, error) {
+	var intBManualReset, intBInitialState int
+	if bManualReset {
+		intBManualReset = 1
+	}
+	if bInitialState {
+		intBInitialState = 1
+	}
+	kernel32, err := syscall.LoadLibrary("kernel32.dll")
+	if err != nil {
+		return 0, err
+	}
+	defer syscall.FreeLibrary(kernel32)
+	Lck, err := syscall.GetProcAddress(syscall.Handle(kernel32), "CreateEventW")
+	if err != nil {
+		return 0, err
+	}
+	r, _, errno := syscall.Syscall6(uintptr(Lck), 4, uintptr(unsafe.Pointer(lpEventAttributes)),
+		uintptr(intBManualReset), uintptr(intBInitialState), uintptr(unsafe.Pointer(lpName)), 0, 0)
+	if HANDLE(r) == 0 {
+		if errno != 0 {
+			return HANDLE(r), error(errno)
+		}
+		return HANDLE(r), syscall.EINVAL
+	}
+	return HANDLE(r), nil
 }
diff --git a/kernel32typedef.go b/kernel32typedef.go
index b882896..801ffee 100644
--- a/kernel32typedef.go
+++ b/kernel32typedef.go
@@ -3,6 +3,11 @@ package win32api
 type Ulong int32
 type Ulong_ptr uintptr
 
+const (
+	LOCKFILE_EXCLUSIVE_LOCK   DWORD = 0x00000002
+	LOCKFILE_FAIL_IMMEDIATELY DWORD = 0x00000001
+)
+
 type PROCESSENTRY32 struct {
 	DwSize              Ulong
 	CntUsage            Ulong
diff --git a/shell32.go b/shell32.go
index 66cb2bc..afac602 100644
--- a/shell32.go
+++ b/shell32.go
@@ -80,9 +80,9 @@ func ShellExecuteEx(muzika *SHELLEXECUTEINFOW) error {
 	if err != nil {
 		return errors.New("Can't Load ShellExecuteEx API")
 	}
-	r, _, err := syscall.Syscall6(ShellExecuteEx, 1, uintptr(unsafe.Pointer(muzika)), 0, 0, 0, 0, 0)
+	r, _, errno := syscall.Syscall6(ShellExecuteEx, 1, uintptr(unsafe.Pointer(muzika)), 0, 0, 0, 0, 0)
 	if r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }
diff --git a/userenv.go b/userenv.go
index bcae2f4..f816f35 100644
--- a/userenv.go
+++ b/userenv.go
@@ -24,9 +24,9 @@ func CreateEnvironmentBlock(lpEnvironment *HANDLE, hToken TOKEN, bInherit uintpt
 	if err != nil {
 		return errors.New("Can't Load WTSQueryUserToken API")
 	}
-	r, _, err := syscall.Syscall6(uintptr(Dup), 3, uintptr(unsafe.Pointer(lpEnvironment)), uintptr(hToken), bInherit, 0, 0, 0)
+	r, _, errno := syscall.Syscall6(uintptr(Dup), 3, uintptr(unsafe.Pointer(lpEnvironment)), uintptr(hToken), bInherit, 0, 0, 0)
 	if r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }
diff --git a/win32api.go b/win32api.go
index d1b66fd..3c97172 100644
--- a/win32api.go
+++ b/win32api.go
@@ -43,6 +43,7 @@ type (
 	LPCVOID                      unsafe.Pointer
 	LPVOID                       unsafe.Pointer
 	LRESULT                      uintptr
+	LPCWSTR                      *uint16
 	PVOID                        unsafe.Pointer
 	QPC_TIME                     uint64
 	ULONG                        uint32
diff --git a/wtsapi32.go b/wtsapi32.go
index 8962e6b..71d7171 100644
--- a/wtsapi32.go
+++ b/wtsapi32.go
@@ -16,9 +16,9 @@ func WTSQueryUserToken(SessionId HANDLE, phToken *HANDLE) error {
 	if err != nil {
 		return errors.New("Can't Load WTSQueryUserToken API")
 	}
-	r, _, err := syscall.Syscall(uintptr(WTGet), 2, uintptr(SessionId), uintptr(unsafe.Pointer(phToken)), 0)
+	r, _, errno := syscall.Syscall(uintptr(WTGet), 2, uintptr(SessionId), uintptr(unsafe.Pointer(phToken)), 0)
 	if r == 0 {
-		return err
+		return error(errno)
 	} else {
 		return nil
 	}
@@ -34,9 +34,9 @@ func WTSEnumerateSessions(hServer HANDLE, Reserved, Version DWORD, ppSessionInfo
 	if err != nil {
 		return errors.New("Can't Load WTSQueryUserToken API")
 	}
-	r, _, err := syscall.Syscall6(uintptr(WT), 5, uintptr(hServer), uintptr(Reserved), uintptr(Version), uintptr(unsafe.Pointer(ppSessionInfo)), uintptr(unsafe.Pointer(pCount)), 0)
+	r, _, errno := syscall.Syscall6(uintptr(WT), 5, uintptr(hServer), uintptr(Reserved), uintptr(Version), uintptr(unsafe.Pointer(ppSessionInfo)), uintptr(unsafe.Pointer(pCount)), 0)
 	if r == 0 {
-		return err
+		return error(errno)
 	}
 	return nil
 }