github.com/secoba/wails/v2@v2.6.4/internal/frontend/desktop/windows/winc/icon.go (about) 1 //go:build windows 2 3 /* 4 * Copyright (C) 2019 The Winc Authors. All Rights Reserved. 5 * Copyright (C) 2010-2013 Allen Dang. All Rights Reserved. 6 */ 7 8 package winc 9 10 import ( 11 "errors" 12 "fmt" 13 "syscall" 14 15 "github.com/secoba/wails/v2/internal/frontend/desktop/windows/winc/w32" 16 ) 17 18 type Icon struct { 19 handle w32.HICON 20 } 21 22 func NewIconFromFile(path string) (*Icon, error) { 23 ico := new(Icon) 24 var err error 25 if ico.handle = w32.LoadIcon(0, syscall.StringToUTF16Ptr(path)); ico.handle == 0 { 26 err = errors.New(fmt.Sprintf("Cannot load icon from %s", path)) 27 } 28 return ico, err 29 } 30 31 func NewIconFromResource(instance w32.HINSTANCE, resId uint16) (*Icon, error) { 32 ico := new(Icon) 33 var err error 34 if ico.handle = w32.LoadIconWithResourceID(instance, resId); ico.handle == 0 { 35 err = errors.New(fmt.Sprintf("Cannot load icon from resource with id %v", resId)) 36 } 37 return ico, err 38 } 39 40 func ExtractIcon(fileName string, index int) (*Icon, error) { 41 ico := new(Icon) 42 var err error 43 if ico.handle = w32.ExtractIcon(fileName, index); ico.handle == 0 || ico.handle == 1 { 44 err = errors.New(fmt.Sprintf("Cannot extract icon from %s at index %v", fileName, index)) 45 } 46 return ico, err 47 } 48 49 func (ic *Icon) Destroy() bool { 50 return w32.DestroyIcon(ic.handle) 51 } 52 53 func (ic *Icon) Handle() w32.HICON { 54 return ic.handle 55 }