Merge pull request #16 from shelllet/master

add shcore, setprocessdpiaware

constants.go

@@ -3026,3 +3026,25 @@ const (
 	ALPC_SYNC_OBJECT_TYPE   uint32 = 2
 	ALPC_THREAD_OBJECT_TYPE uint32 = 4
 )
+
+// Device scale factor
+// https://docs.microsoft.com/zh-cn/windows/win32/api/shtypes/ne-shtypes-device_scale_factor
+const (
+	DEVICE_SCALE_FACTOR_INVALID = 0
+	SCALE_100_PERCENT           = 100
+	SCALE_120_PERCENT           = 120
+	SCALE_125_PERCENT           = 125
+	SCALE_140_PERCENT           = 140
+	SCALE_150_PERCENT           = 150
+	SCALE_160_PERCENT           = 160
+	SCALE_175_PERCENT           = 175
+	SCALE_180_PERCENT           = 180
+	SCALE_200_PERCENT           = 200
+	SCALE_225_PERCENT           = 225
+	SCALE_250_PERCENT           = 250
+	SCALE_300_PERCENT           = 300
+	SCALE_350_PERCENT           = 350
+	SCALE_400_PERCENT           = 400
+	SCALE_450_PERCENT           = 450
+	SCALE_500_PERCENT           = 500
+)

shcore.go

@@ -0,0 +1,24 @@
+// Copyright 2010-2012 The W32 Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package w32
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var (
+	modshcore = syscall.NewLazyDLL("Shcore.dll")
+
+	getScaleFactorForMonitor = modshcore.NewProc("GetScaleFactorForMonitor")
+)
+
+func GetScaleFactorForMonitor(hMonitor HMONITOR, scale *int) HRESULT {
+	ret, _, _ := getScaleFactorForMonitor.Call(
+		uintptr(hMonitor),
+		uintptr(unsafe.Pointer(scale)))
+
+	return HRESULT(ret)
+}

user32.go

@@ -11,6 +11,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
+
 	//"regexp"
 	"syscall"
 	"unicode/utf8"
@@ -136,6 +137,7 @@ var (
 	procVkKeyScanW                    = moduser32.NewProc("VkKeyScanW")
 	procVkKeyScanExW                  = moduser32.NewProc("VkKeyScanExW")
 	procWaitMessage                   = moduser32.NewProc("WaitMessage")
+	setProcessDPIAware                = moduser32.NewProc("SetProcessDPIAware")
 )
 
 func SendMessageTimeout(hwnd HWND, msg uint32, wParam, lParam uintptr, fuFlags, uTimeout uint32, lpdwResult uintptr) uintptr {
@@ -1261,11 +1263,18 @@ func VkKeyScanW(char uint16) int16 {
 }
 
 // Translates a character to the corresponding virtual-key code and shift state.
-//See https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-vkkeyscanexw
+// See https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-vkkeyscanexw
 func VkKeyScanExW(char uint16, hkl HKL) int16 {
 	ret, _, _ := procVkKeyScanExW.Call(
 		uintptr(char),
 		uintptr(hkl),
 	)
 	return int16(ret)
 }
+
+// Sets the process-default DPI awareness to system-DPI awareness.
+// See https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setprocessdpiaware
+func SetProcessDPIAware() bool {
+	ret, _, _ := setProcessDPIAware.Call()
+	return ret != 0
+}